P 7 0 0 0

Installation & Operation

®

trans

nova

®

USA

N O T I C E - I M P O R T A N T S A F E T Y I N F O R M A T I O N

C A U T I O N

RISK OF ELECTRIC SHOCK

DO NOT OPEN

!

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons.

WARNING: TO PREVENT FIRE OR

SHOCK HAZARD, DO NOT EXPOSE THIS

EQUIPMENT TO RAIN OR MOISTURE.

!

The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

1.

READ INSTRUCTIONS

All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment.

2.

RETAIN OWNER'S MANUAL

These safety and operating instructions should be retained for future reference.

3.

HEED WARNINGS

All warnings on the equipment and in the operating instructions are important and should be followed.

4.

FOLLOW INSTRUCTIONS

All operating and use instructions are important and should be followed.

5.

HEAT

The equipment should be kept away from areas of high temperature, i.e., heater vents, radiators, stoves/ovens, fireplaces, etc.

6.

VENTILATION

The equipment should be used in an area suitable for proper ventilation. Care should be taken not to impede airflow in and around the cabinet.

7.

WATER AND MOISTURE

The equipment should not be used in or around water, such as a bathtub, sink, or swimming area. Also, the equipment should not be used in areas prone to flooding, such as a basement.

8.

POWER SOURCES

The equipment should be connected only to a power source of the same voltage and frequency as that listed on the rear panel above the power cord entry point.

9.

POWER CORD PROTECTION

Power cords should be arranged so they do not interfere with the movement of objects in the room: people, fan blades, utility carts, etc. Also, care should be taken that the cord is not pinched or cut, and placed so it is not in danger of being pinched or cut, as in under a rug, around a tight corner, etc.

10. POWER CORD GROUNDING

The power supply cord is of a three wire grounded type, designed to reduce the risk of electric shock sustained from a live cabinet.

It is assumed to be of suitable length for most uses of the equipment. The use of extension cords and power strips is discouraged unless they are of suitable rating to deliver the required total current for safe operation of all connected equipment. Furthermore, extension cords or power strips must provide the same three wire grounded connection. It is important that the blades of the equipment’s plug be able to fully insert into the mating receptacle. Never remove the round grounding pin on the plug in an attempt to mate to a two wire ungrounded receptacle: use a grounding adaptor with the grounding tab or wire suitably connected to earth ground.

11. NON-USE PERIODS

During periods of extended non-use, the power cord should be unplugged from the power source.

12. CLEANING

The equipment should be cleaned only as detailed in the operating instructions.

13. OBJECT AND LIQUID ENTRY

Care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the enclosure of the equipment.

14. DAMAGE REQUIRING SERVICE

Hafler equipment should be serviced by qualified service personnel when:

A. The power supply cord or plug has been damaged, or

B. Objects have fallen, or liquid has been spilled into the equipment, or

C. The equipment has been exposed to rain, or

D. The equipment does not appear to operate normally or exhibits a marked change in performance, or

E. The equipment has been dropped, or the enclosure has been damaged.

15. SERVICING

The user should not attempt to service the equipment beyond that which is described in the operating instructions. All other service should be referred to qualified service personnel.

16. CARTS AND STANDS

The equipment should be used with carts or stands only of sufficient strength and stability for the use intended.

An equipment and cart combination should be moved with care.

Quick stops and starts, excessive force, and uneven surfaces may cause the equipment and cart combination to topple.

– i –

P

E R F O R M A N C E

S

P E C I F I C A T I O N S

P7000

Power Rating: FTC (20Hz-20kHz, <0.1% THD) EIA (1kHz, 0.1% THD)

350 wpc into 8

Ω

500 wpc into 4

Ω

*

1000 wpc into 8

Ω

*

375 wpc into 8

525 wpc into 4

1050 wpc into 8

Ω

Ω

Ω

*

*

*Continuous sine wave power limited by current rating of line fuse.

Signal-to-Noise: 100dB below rated output from 20Hz to 20kHz

Frequency Response:

±

0.1dB, 20Hz to 20kHz

Slew Rate:

Input Impedance:

+0/–3dB, 0.2Hz to 100kHz

100 V/

µ s

47,000

Ω

per phase

Input Sensitivity Range for rated output power:

Unbalanced: 1.7V-9.5V RMS (8

Ω

), 1.4V-8V RMS (4

Ω

)

Balanced: 0.85V-4.75 RMS (8

Ω

), 0.7V-4V RMS (4

Ω

)

Gain: +15dB min. / +30 max.

CMRR:

Damping Factor:

–75dB at 1kHz

600 (to 1kHz); 200 (to 10kHz); 25 (to 100kHz)

Power Consumption: 275 VA quiescent.

1440 VA with both channels driven at 350 watts at 8

Ω

, 1800 VA maximum.

Controls & Switches: Front Panel: Power switch, Normal/Bridged mode switch, level controls

Crossover:

Indicators:

Connectors:

Rear Panel: Chassis/Float ground switch, Stereo/Bi-amp selector switch

Variable high-pass, low-pass and bandpass; 100Hz as supplied

Power lamp, Clip, Short, Thermal, Signal LEDs

Input: 2-way XLR and 1/4" Tip Ring Sleeve

Dimensions:

Net Weight:

Output: 5-way binding posts spaced for dual banana plugs

Power: IEC 320

19"W x 12 7 ⁄

8

"D x 3 1 ⁄

2

"H plus 1 1 ⁄

8

" for handles, includes rear supports

(48.3cm x 32.7cm x 8.3cm plus 2.875cm for handles, includes rear supports)

40 lbs. (18.18kg)

– ii –

T

A B L E O F

C

O N T E N T S

SAFETY PRECAUTIONS ........................................................................................................................................... i

PERFORMANCE SPECIFICATIONS ......................................................................................................................... ii

INTRODUCTION ................................................................................................................................................... 1

INSTALLATION

Location ........................................................................................................................................................... 2

AC Line ............................................................................................................................................................ 2

Input ................................................................................................................................................................. 2

Input Crossover ................................................................................................................................................ 3

Input Mode Switches ........................................................................................................................................ 3

Output Connections ......................................................................................................................................... 3

OPERATION

Power Switch ................................................................................................................................................... 4

Level Controls .................................................................................................................................................. 4

XCard Crossovers ............................................................................................................................................. 4

Ground Switch ................................................................................................................................................. 5

Short Circuit Protection .................................................................................................................................... 5

LED Indicators .................................................................................................................................................. 5

Warm Up ......................................................................................................................................................... 5

Cleaning and Maintenance ............................................................................................................................... 5

TECHNICAL REFERENCE

Field Service Considerations ............................................................................................................................. 6

Theory and Operation of trans• nova ................................................................................................................ 6

PC Board Layout ............................................................................................................................................... 7

Schematic Diagram .......................................................................................................................................... 8

Parts List ......................................................................................................................................................... 10

P7000 Functional Block Diagram ................................................................................................................... 12

Circuit Operation ........................................................................................................................................... 13

Amplifier Module Replacement ...................................................................................................................... 16

Building Custom XCards ................................................................................................................................. 17

Resistor Chart ................................................................................................................................................. 18

WARRANTY ......................................................................................................................................................... 19

I

N T R O D U C T I O N

The Hafler P7000 is a two channel professional power amplifier suitable for use in any sound reinforcement situation where faithful, accurate reproduction is required. The amplifier uses forced air fan cooling to deliver high power output in a compact size. Status indicators on the front panel give a visual representation of amplifier and system operation. Input configuration switching and active crossovers enhance the flexibility when used in multiple amp systems, without requiring the use of additional equipment. The use of our patented trans•nova circuit topology and MOSFET output stage ensures reliable, long term operation which is backed by our five year warranty.

This manual contains information on using the P7000 amplifiers. It is organized into three main sections.

“Installation” covers the location and connection of the amplifier in the system. Like many precision components, careful attention to the initial setup can yield dividends in higher performance and trouble-free use. “Operation” covers the controls and features of the amplifiers and how to use them to get the best effect.

The “Technical Reference” section contains field service information; in addition to the schematic and parts list there are block diagrams and circuit operation explanations useful for technicians. We strongly urge reading over the Installation and Operation portions of this manual before putting the amplifier into service.

The circuitry used in the Hafler Professional power amplifiers is our trans•nova (TRANSconductance NOdal

Voltage Amplifier, US Patent 4,467,288) circuit. The P7000 also utilizes our proprietary DIABLO (Dynamically

Invariant AB Linear Operation, patent application in progress) transconductance driver stage which combines the linearity of Class A operation with the current headroom of a Class B system. When combined with the robust output stage used in the P7000, DIABLO yields lower high frequency distortion without the sonic penalties associated with increasing the negative feedback. We have been using MOSFETs in our power amplifiers since the 1970s. During this time, they proved to be extremely fault tolerant, even in abusive situations. This ruggedness enables the amplifier to drive reactive speaker loads without the performance and sound penalties imposed by elaborate Safe Operating Area protection schemes.

Active crossovers are incorporated at the input of the amplifier. These crossovers are controlled through the use of our XCard plug-in modules. Each XCard can operate as a full-range, high-pass or low-pass filter with a

12dB per octave Butterworth alignment. Each channel utilizes two XCards which in combination can be configured as a 24dB per octave slope or a 12dB per octave bandpass filter. Since the XCard contains the resistors and capacitors that establish the crossover Q and frequency; specific system requirements can easily be accommodated just by changing the component values.

Input configuration switches allow the amplifier to be configured for conventional stereo, two channel mono or single channel bridged use. When the amplifier is run in two-channel mono mode, the level controls and crossovers for each channel are fully functional which allows for using the amplifier as a single channel in a bi-amped system.

Specialized circuits which prevent damage to the amplifiers and speakers have been carefully implemented to avoid affecting the audio signal. A soft start circuit prevents sending potentially destructive turn-on and turnoff transients to the speakers. A thermal sensing network monitors the heatsink temperature and shuts down the amplifier to protect it from excessive operating heat. The need for internal fuses has been eliminated; a sensing circuit monitors the output and shuts down the power when it detects a short in the output load.

Each channel of the amplifier has been built as a self-contained module. This modular arrangement simplifies construction and improves service accessibility. The circuit board assembly makes extensive use of surface mount components in the low power portion of the audio circuitry. Automated equipment is used to place and solder the components which yields greater uniformity and reliability.

The front panel has controls for input level adjustment and the power switch. In addition, LED indicators give a visual representation of the operating status of each channel. The THERMAL and SHORT indicators light to show when these protection circuits have been activated. The clip indicator helps prevent damaging the speakers by showing when the amplifier is overdriven. The SIGNAL indicator lights to show the presence of an audio signal.

– 1 –

I

N S T A L L A T I O N

LOCATION

The P7000 uses forced-air fan cooling to remove the heat produced in normal operation. Although this makes the amplifier less sensitive to ventilation than if it were passively cooled, fresh air flow at the mounting location must still be considered. The fan pulls in fresh air through the side vents and the heated air is forced out through the front panel. Another consideration when choosing the location for a fan cooled amplifier is its proximity to the listening position. In some situations the sound of the fan operation can be distracting.

The power transformer can generate a substantial magnetic field, so caution should be exercised in the placement of low level components such as a tape deck, mixer or mic preamp to avoid inducing noise in the low level circuitry. Allow several inches of clearance when mounting these components.

AC LINE

The P7000 operates from a 120 volt, 60Hz AC power line. Connection is made by 14 gauge, IEC Type 320, grounded line cord. For safety considerations only a properly grounded (earthed) receptacle should be used.

If a grounded circuit is not available do not break off the ground pin; use the proper adapter plug for a two wire receptacle. The power line fuse is mounted on the rear panel of the amplifier. If this fuse blows replace it only with the same type and rating fuse. The correct replacement fuse value is printed on the rear of the amplifier and in the parts list.

INPUT

The input jacks used on the P7000 are dual function connectors which accept 1/4" (Tip Ring Sleeve) phone and

XLR plugs. The amplifier will operate with either a balanced or unbalanced signal source. The connector pinout is printed on the rear panel of the amplifier.

Balanced Input: 1/4" Tip Ring Sleeve

The 1/4" balanced input jack is connected according to conventional usage with the Tip high (+), Ring return (–) and the Sleeve ground shield.

Balanced Input: XLR

The XLR balanced input jack is connected according to the IEC and AES Standard, with pin 2 high (+), pin 3 return (–) and pin 1 ground shield. When preparing to use the amplifier, check the output configuration of the source unit to maintain the proper signal polarity.

Unbalanced Input

Many popular mixers use unbalanced RCA phono or 1/4" phone jacks for the monitor outputs and can be used with the P7000 for short cable runs. The specifications for the mixer should give the maximum cable length it is capable of driving. The return (–) terminal must be grounded when using the amplifier with the input unbalanced to prevent unstable operation.

Unbalanced Source with Balanced Input

Some systems will have a noticeable amount of residual ground noise when run with unbalanced signal lines. Better noise rejection can be achieved in these systems by using shielded, twisted pair (balanced) cable from the unbalanced source. At the source end of the cable, connect an RCA or 1/4" phone plug with the return (–) wire and shield connected to the ground terminal of the plug. Wire the plug at the amplifier end of the cable the same as for the regular balanced input connection described above.

– 2 –

INPUT CROSSOVER

The XCard crossover modules are plug-in cards located inside the amplifier. The P7000 is shipped with 100Hz

XCards in each channel. Since each XCard can operate full range, high-pass or low-pass, with a 12dB per octave slope, this allows the amplifier to be used in a wide range of applications. XCards are available for a variety of frequencies from your dealer or through our Customer Service department.

To order additional XCards call Customer Service at 800-669-9899. Office hours are 8:00 a.m. to 5:00 p.m. MST,

Monday through Friday. All orders are pre-paid and VISA and MasterCard are accepted.

INPUT MODE SWITCHES

Two-Channel Stereo

To run the P7000 in two-channel mode, set the front channel NORMAL/BRIDGED switch in the

NORMAL position and set the rear panel STEREO/BI-AMP switch to the STEREO position. This configures the amplifier for conventional left and right stereo operation.

Dual Mono

The rear panel STEREO/BI-AMP switch configures the input connection required by the amplifier.

With the switch set for STEREO Channel 1 and Channel 2 require separate input signal source feeds.

When the switch is set for BI-AMP the Channel 1 input feeds the signal to both amplifier channels for dual-mono operation. The level control and XCard for each channel are still active.

Bridged Mono

In systems with higher power requirements, the P7000 can be configured for signal channel, bridged mono operation. To bridge the amplifier, set the front panel NORMAL/BRIDGED switch to the

BRIDGED position. Only the Channel 1 input and level control is used and the Channel 2 level control and XCard are not active. The speaker is connected to the RED output binding posts. When the amplifier is bridged, the output is floating. Any speaker which requires a common ground from the amplifier output cannot be used in this application. Since a bridged amplifier shares the load between the two channels, each channel will effectively drive half of the load. Therefore, for bridged operation we recommend using an eight ohm load as the minimum impedance.

OUTPUT CONNECTIONS

The speaker output connectors are dual binding posts which will accept wire up to 12 AWG. They are spaced on 3/4" centers for use with dual banana plugs.

– 3 –

O

P E R A T I O N

POWER SWITCH

The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on. Standard practice is to turn the amplifier on last and off first when switching components individually to prevent sending damaging transients, generated in the source components, to the speakers. It is possible to leave the power switch in the on position and switch the amplifier remotely through a power distribution block or preamp switched outlet. When doing so make sure the switch is rated for the current required by the amplifier.

LEVEL CONTROLS

The input sensitivity, for each channel, can be adjusted individually using the level controls on the front panel.

The gain control on an amplifier is usually fully advanced to its maximum (rated) sensitivity. In public systems where it is necessary to match levels, the knobs can be removed and the controls adjusted with your fingers or a flathead screwdriver. Cover the holes with the enclosed plugs to restrict access.

INPUT CONFIGURATION SWITCHES

Stereo/Bi-Amp

The rear panel STEREO/BI-AMP switch controls the signal routing in the amplifier. In the STEREO position, the signal is supplied independently to Channel 1 and Channel 2. In the BI-AMP position, the signal is fed to both amplifier channels from the Channel 1 input, while retaining full use of the level controls and XCard crossovers. This allows the amplifier to be used in dual-mono or bi-amp systems without requiring auxiliary equipment.

Normal/Bridged

The amplifier operates in two-channel mode when the front panel NORMAL/BRIDGED switch is in the NORMAL position and the rear channel switch is set for STEREO. To use the amplifier in single channel, bridged mono applications, the front panel switch must be in the BRIDGED position. When the switch is set in the BRIDGED position, the Channel 1 (+) and (–) inputs are connected to Channel

2 in reversed polarity, which inverts the Channel 2 output. Only the Channel 1 input is used, and the speaker is connected to the two RED binding posts. The amplifier gain is adjusted by the Channel 1 level control; the Channel 2 control is not active. Because of thermal considerations we do not recommend using less than a nominal eight ohm load on the amplifier when running it in mono.

XCARD CROSSOVERS

The XCard modules contain the resistors and capacitors which control the frequency at which the card operates. The orientation of the card in the socket determines the operating mode of the crossover. The XCard is labeled to indicate the function of each face. The full range face is marked with a double arrow to show that both edges operate full range. The other face operates as either high-pass or low-pass and an arrow is printed by the function to indicate which edge to insert into the socket.

Each amplifier channel uses two XCards. When both cards are set full range, the full frequency response of the amplifier is used. When one card is set full range and the other for either high-pass or low-pass, the signal is crossed over at 12dB per octave with a Butterworth alignment at the frequency determined by the card which is used. When both cards are set for the same operation, whether it is high-pass or low-pass, the signal is crossed over at a 24dB per octave slope. When one card is set for low-pass and the other for high-pass, a bandpass crossover limits the signal to the frequency range determined by the cards which are used. The slope of the filter is 12dB per octave. There is no effect on the bandpass operation regardless of which of the cards is used for the high-pass or low-pass function.

Assembled XCards are available at a variety of operating frequencies. Since there will be situations which the stock cards will not satisfy, instructions for building XCards for specific applications have been included in the Technical Reference section of this manual.

– 4 –

GROUND SWITCH

Ground loops are characterized by a hum or buzz through the speakers and are caused by a voltage potential difference between two points in a ground circuit. Ground loops are aggravated when multiple paths exist for a given circuit. Mounting components in a rack with metal rails may introduce ground loops between associated equipment, because the rails can establish an additional ground path. The CHASSIS/FLOAT switch allows you to select the amplifier grounding scheme for best system compatibility. With the switch in the

CHASSIS position all signal grounds are referred to the chassis and power line ground. In the FLOAT position the signal ground is decoupled from the chassis. The position of the switch is determined by the overall noise in the system; choose the position which gives the lowest hum.

SHORT CIRCUIT PROTECTION

The self-protecting properties of the output power MOSFETs eliminates the need for sonically degrading voltage and current limiting circuits. To protect the amplifier from problems which may occur in the speaker line, there is an overload detection circuit. In the event of a short in the speaker load or cables, the detection circuit will shut down that channel and light the front panel SHORT indicator. If this happens, correct the fault and turn the amplifier off, then back on to reset the short detector.

LED INDICATORS

Amplifier operation is monitored internally and each channel has four status LEDs. These indicators can be used for system troubleshooting in case of aberrant behavior.

Signal

Monitors the amplifier output and lights when a signal is present. The SIGNAL indicator is calibrated to activate an equivalent input voltage of 30mV, with the amplifier set for full gain.

Clipping

Monitors the DRIVE SIGNAL and lights when the drive signal voltage exceeds the maximum level for linear operation of the output MOSFETs.

Thermal

Indicates when the thermal protection has shut down the amplifier. This occurs when the heatsink temperature becomes excessive.

Short

Indicates when the output overload monitor detects a potentially damaging short and shuts down power to the shorted channel. After clearing the fault, restore normal operation by turning the power switch off, then on again.

WARM UP

In order to achieve the best sonic performance and image stability from the amplifier, we recommend letting it warm up for 1 hour before beginning any critical listening.

CLEANING AND MAINTENANCE

There is no requirement for regular maintenance on the electronic components of the amplifier. If the case becomes soiled it can be cleaned using a soft cloth and a mild detergent, such as spray window or glass cleaner.

If the amplifier is located in a particularly dusty environment cleaning the inside with compressed air or vacuuming every 18 to 24 months is sufficient.

– 5 –

T

E C H N I C A L

R

E F E R E N C E

FIELD SERVICE CONSIDERATIONS

A primary focus during the design and development of the P7000 was to ensure the dependability of the amplifiers. The use of lateral MOSFET output transistors and the low voltage trans•nova input stage combined with careful component selection for the circuit assembly made the reliability goals achievable. However, a parallel effort was also undertaken to make sure any down time caused by an amplifier fault was minimized by making the amplifier technician “friendly.”

The modular construction allows exchanging the entire operational portion of either channel quickly and easily without the need for soldering or specialized equipment.

This section of the manual contains descriptions of circuit operation and block diagrams to assist technicians with component level repairs.

THEORY AND OPERATION OF trans• nova

The trans• nova (TRANSconductance NOdal Voltage Amplifier) principle is based on our 1984 U.S. Patent

4,467,288. This patent describes the advantages of audio power amplifiers in which a MOSFET output stage is connected in a grounded source configuration. In this connection the output stage has its full voltage gain of typically

20dB (ten times), instead of the usual 1dB loss of voltage follower designs. The output stage is further refined into a transimpedance stage (current-to-voltage converter), to achieve extremely short loop (fast) negative feedback. The output stage is driven cooperatively by a transconductance stage (voltage-to-current converter).

Using the output stage to supply voltage gain inherently increases the power gain (for the same bandwidth) of the output stage by typically ten times over the conventional follower connection, using the same MOSFET devices. This increase in efficiency allows the use of a much simpler input section than in the more common high voltage designs. The number of serial stages, from input to output can be reduced from five or more to only three. This also allows the input section to be designed with the criteria of high quality Class A line amp with the characteristic high linearity and wide bandwidth.

The disadvantage of the Class A driver stage is the limited current headroom available. A conventional Class A transconductance stage has a 2:1 or 6dB limit on peak-to-quiescent current. The number of MOSFETs used in the P7000 imposes a significant capacitive load on the driver stage, enough of a load to strain the ability of the driver to deliver the required current at the high audio frequencies.

Since the operation of the transconductance driver stage is a major factor in the reproduction quality of the amplifier, we developed our proprietary DIABLO (Dynamically Invariant A-B Linear Operation, patent application in process) circuit to satisfy the current headroom requirements. DIABLO does this by smoothly and continuously varying the current transfer ratios of the two transconductance paths, under the control of the signal current itself. This implementation allows the current transfer ratio of one path to be smoothly and continuously reduced to zero while the other path is smoothly and continuously increased by a factor of two. This yields an additional 14dB of current headroom to drive the MOSFETs. The result is a dramatic reduction in high frequency distortion, combined with improved ultrasonic stability.

The P7000 has the highest power rating of any amplifier utilizing the basic trans• nova principle. Designers of systems with high power requirements can now take advantage of the natural and realistic reproduction characteristic of the trans• nova circuit topology.

– 6 –

P C B

O A R D

L

A Y O U T

– 7 –

P

A R T S

L

I S T

DESIGNATOR VALUE

ALL RESISTORS IN OHMS

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R40

R41

R42

R43

R44

R45

R46

R47

R48

R49

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

R30

R31

R32

R33

R34

R35

R36

R37

R38

R39

R20

R21

R22

R23

R24

R25

R26

R27

R28

R29

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R5

R6

R7

R8

R9

R1

R2

R3

R4

1.5k, 1/4W, 5%

100, 1/4W, 5%

10k, 1/4W, 5%

15k, 1/4W, 5%

10k, 1/4W, 5%

15k, 1/4W, 5%

47k, 1/4W, 5%

10k, 1/4W, 5%

4.7k, 1/4W, 5%

6.8k, 1/4W, 5%

4.7k, 1/4W, 5%

4.7k, 1/4W, 5%

4.7k, 1/4W, 5%

2.2M, 1/4W, 5%

10k, 1/4W, 5%

100k, 1/4W, 5%

15k, 1/4W, 5%

10k, 1/4W, 5%

100k, 1/4W, 5%

10k, 1/4W, 5%

475, 1/4W, 1%

100k, 1/4W, 5%

2.2M, 1/4W, 5%

10k, 1/4W, 5%

100k, 1/4W, 5%

475, 1/4W, 1%

220, 1/4W, 5%

220, 1/4W, 5%

100, 1/4W, 5%

100, 1/4W, 5%

56.2k, 1/4W, 1%

1k, 1/4W, 5%

47k, 1/4W, 5%

47k, 1/4W, 5%

1k, 1/4W, 5%

280, 1/4W, 1%

2.15k, 1/4W, 1%

200 Trim Pot

2.26k, 1/4W, 1%

28k, 1/4W, 1%

300k, 1/4W, 5%

28k, 1/4W, 1%

470k, 1/4W, 5%

100, 1/4W, 5%

3.3M, 1/4W, 5%

4.7k, 1/4W, 5%

10k, 1/4W, 5%

100k, 1/4W, 5%

604k, 1/4W, 1%

45.3k, 1/4W, 1%

2.2M, 1/4W, 5%

100k, 1/4W, 5%

100k, 1/4W, 5%

10k Pot, Dual

1k, 1/4W, 5%

2.2M, 1/4W, 5%

316, 1/4W, 1%

316, 1/4W, 1%

3.92k, 1/4W, 1%

3.92k, 1/4W, 1%

0, 1/4W, 1%

100, 1/4W, 5%

100, 1/4W, 5%

475, 1/4W, 1%

220, 1/4W, 5%

1k, 1/4W, 5%

1k, 1/4W, 5%

3.3M, 1/4W, 5%

1k, 1/4W, 5%

PART #

RM/4-152C

RM/4-101C

RM/4-103C

RM/4-153C

RM/4-103C

RM/4-153C

RM/4-473C

RM/4-103C

RM/4-472C

RM/4-682C

RM/4-472C

RM/4-472C

RM/4-472C

RM/4-225C

RM/4-103C

RM/4-104C

RM/4-153C

RM/4-103C

RM/4-104C

RM/4-103C

RM/4-4750C

RM/4-104C

RM/4-225C

RM/4-103C

RM/4-104C

RM/4-4750C

RM/4-221C

RM/4-221C

RM/4-101C

RM/4-101C

RM/4-4532C

RM/4-225C

RM/4-104C

RM/4-104C

RV-0818

RM/4-102C

RM/4-225C

RM/4-3160C

RM/4-3160C

RM/4-3921C

RM/4-3921C

RM/4-000C

RM/4-101C

RM/4-101C

RM/4-4750C

RM/4-221C

RM/4-102C

RM/4-102C

RM/4-335C

RM/4-102C

RMP/4 5622-03

RM/4-102C

RM/4-473C

RM/4-473C

RM/4-102C

RM/4-2800C

RM/4-2151C

RVH-201

RM/4-2261C

RMP/4-2802

RM/4-304C

RM/4-2802C

RM/4-474C

RM/4-101C

RM/4-335C

RM/4-472C

RM/4-103C

RM/4-104C

RM/4-6043C

– 10 –

C11

C12

C13

C14

C15

C16

C17

C18

C19

C20

C1

C2

C3

C4

C5

C6

C7

C8

C9

C10

DESIGNATOR VALUE

R99

R123

R124

R127

R128

R129

R130

R131

R132

R133

R89

R90

R91

R92

R93

R94

R95

R96

R97

R98

R134

R135

R136

R138

R139

R140

R141

R159

R164

R79

R80

R81

R82

R83

R84

R85

R86

R87

R88

R70

R71

R72

R73

R74

R75

R76

R77

R78

100, 1/4W, 5%

100, 1/4W, 5%

100, 1/4W, 5%

68, 1/4W

51, 1/4W, 5%

51, 1/4W, 5%

11.8k, 1/10W, 1%

20k, 1/10W, 1%

10M, 1/10W, 5%

11.8k, 1/10W, 1%

20k, 1/10W, 1%

10M, 1/10W, 5%

1k, 1/4W, 5%

10k, 1/4W, 5%

2k, 1/4W, 5%

1k, 1/4W, 5%

1k, 1/4W, 5%

4.7k, 1/4W, 5%

1.74k, 1/4W, 1%

6.8k, 1/4W, 5%

10k, 1/4W, 5%

15k, 1/4W, 5%

4.7k, 1/4W, 5%

22k, 1/4W, 5%

100k, 1/4W, 5%

100k, 1/4W, 5%

22k, 1/4W, 5%

100k, 1/4W, 5%

4.7k, 1/4W, 5%

100k, 1/4W, 5%

2k, 1/4W, 5%

820, 1/4W, 5%

2k, 1/4W, 5%

100, 1/4W, 5%

100, 1/4W, 5%

2k, 1/4W, 5%

1k, 1/4W, 5%

1.5k, 1/4W, 5%

1k, 1/4W, 5%

47.5, 1/4W, 1%

1k, 1/4W, 5%

200 Trim Pot

47.5, 1/4W, 1%

475, 1/4W, 1%

0, 1/4W, 1%

475, 1/4W, 1%

475, 1/4W, 1%

220, 1/4W, 5%

680pF, 100V

0.1

µ

F, 50V

CDS-681DBAA

CDS-104CCDB

4700

µ

F, 100V, Electrolytic CERS-478E

0.1

µ

F, 50V CDS-104CCDB

4700

µ

F, 100V, Electrolytic CERS-478E

270pF, 50V

270pF, 50V

CDS-271CAAA

CDS-271CAAA

27pF, 100V

0.1

µ

F, 50V

CDS-270DAAA

CDS-104CCDB

4700

µ

F, 100V, Electrolytic CERS-478E

4700

µ

F, 100V, Electrolytic CERS-478E

4700

µ

F, 100V, Electrolytic CERS-478E

470

µ

F, 50V, Electrolytic

470

µ

F, 50V, Electrolytic

CER-477C-024

CER-477C-024

0.1

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

CDS-104CCDB

CDS-104CCDB

CDS-104CCDB

CDS-104CCDB

CDS-104CCDB

CDS-104CCDB

PART #

RM/4-682C

RM/4-103C

RM/4-153C

RM/4-472C

RM/4-223C

RM/4-104C

RM/4-104C

RM/4-223C

RM/4-104C

RM/4-472C

RM/4-104C

RM/4-202C

RM/4-821C

RM/4-202C

RM/4-101C

RM/4-101C

RM/4-202C

RM/4-102C

RM/4-152C

RM/4-102C

RM/4-101C

RM/4-101C

RM/4-101C

RM/4-680C

RM/4-510C

RM/4-510C

RM/10-1182B

RM/10-2002B

RM/10-106B

RM/10-1182B

RM/10-2002B

RM/10-106B

RM/4-102C

RM/4-103C

RM/4-202C

RM/4-102C

RM/4-102C

RM/4-472C

RM/4-1741C

RM/4-0475C

RM/4-102C

RVH-201

RM/4-0475C

RM/4-4750C

RM/4-000C

RM/4-4750C

RM/4-4750C

RM/4-221C

Q11

Q12

Q17

Q18

Q19

Q20

Q30

Q31

Q32

Q33

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

Q10

Q40

Q41

Q42

Q43

Q103

Q104

Q105

C44

C45

C46

C47

C48

C49

C50

C112

C113

C114

C115

C116

C119

C120

C33

C34

C35

C36

C37

C38

C39

C40

C42

C43

C21

C22

C23

C24

C25

C26

C27

C28

C29

C30

C31

C32

DESIGNATOR VALUE

10

µ

F, 16V, Electrolytic

10

µ

F, 16V, Electrolytic

0.47

µ

F, 50V

0.47

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

4700

µ

F, 100V, Electrolytic

47

µ

F, 16V, Electrolytic

10

µ

F, 50V, Electrolytic

0.1

µ

F, 50V

0.1

µ

F, 50V

27pF, 50V

0.1

µ

F, 50V

27pF, 50V

22pF, 500V, Mica

47pF, 500V, Mica

0.1

µ

F, 50V

0.1

µ

F, 50V

1.0

µ

F, 50V, Electrolytic

0.1

µ

F, 50V

0.01

µ

F, 1kV, Disk

0.1

µ

F, 50V

0.1

µ

F, 50V

100pF, 50V

22pF, 500V, Mica

0.047

µ

F, 50V

0.1

µ

F, 50V

0.1

µ

F, 50V

27pF, 100V

100

µ

F, 25V, Electrolytic

100

µ

F, 25V, Electrolytic

100pF, 50V

100pF, 50V

0.047

µ

F, 50V

0.1

µ

F, 100V, Mylar

0.1

µ

F, 100V, Mylar

MMBT5088L

LM-317 + Regulator

LM-337 – Regulator

MMBT3904L

MMBT5087L

MMBT5088L

MMBT5088L

MMBT3904L

MPS-A56

MPS-A56

MPS-A06

MPS-A06

MMBT5088L

MMBT5087L

2N-6488

MMBT3904L

N Channel MOSFET

N Channel MOSFET

N Channel MOSFET

N Channel MOSFET

P Channel MOSFET

P Channel MOSFET

P Channel MOSFET

P Channel MOSFET

MMBT5088L

MMBT5087L

MMBT5087L

BR1

CR1

CR2

CR3

CR4

Bridge Rectifier

LED Red

LED Red

LED Red

LED Green

PART #

CER-106SM

CER-106SM

CYV-474-024

CYV-474-024

CDS-104CCDB

CDS-104CCDB

CERS-478E

CER-476-024

CER-106C-024

CDS-104CCDB

CDS-104CCDB

CDS-270CAAA

CDS-104CCDB

CDS-270CAAA

CM-220-024

CM-470-024

CDS-104CCDB

CDS-104CCDB

CER-105CSM

CDS-104CCDB

CD-103/20-024

CDS-104CCDB

CDS-104CCDB

CDS-101CAAA

CM-220-024

CDS-473CBBA

CDS-104CCDB

CDS-104CCDB

CDS-270DAAA

CER-107A-024

CER-107A-024

CDS-101CAAA

CDS-101CAAA

CDS-473CBBA

CY-104-024

CY-104-024

SS-0114

SS-239-046

SS-240-046

SS-0792

SS-0115

SS-0114

SS-0114

SS-0792

SS-101A

SS-101A

SS-102A

SS-102A

SS-0114

SS-0115

SS-112C-046

SS-0792

SS-0961-069

SS-0961-069

SS-0961-069

SS-0961-069

SS-0962-069

SS-0962-069

SS-0962-069

SS-0962-069

SS-0114

SS-0115

SS-0115

SSH-609

SS-741

SS-741

SS-741

SS-740

– 11 –

J301

SL1

SW1

SW2

SW3

SW4

F1

TS1

DESIGNATOR VALUE

CR12

CR13

CR14

CR15

CR16

CR18

CR19

CR5

CR6

CR7

CR8

CR9

CR10

CR11

U1

U2

U3

U4

U5

U6

U7

U8

U9

TL072CD Opamp

TL072CD Opamp

LM-393 Dual Comparator

LM339 Quad Comparator

LM339 Quad Comparator

XCard Connector

TL072CD Opamp

XCard Connector

LM-393 Dual Comparator

PART #

MMBD914L Diode

MMBD914L Diode

SS-803SM

SS-803SM

MMBD914L Diode

MMBD914L Diode

SS-803SM

SS-803SM

MMBZ5240BL 10V Zener Diode SS-1052

Bridge Rectifier 1.5A

BAV99L Dual Diode

SS-0800

SS-260SM

BAV99L Dual Diode

MMBD914L Diode

BAV99L Dual Diode

SS-260SM

SS-803SM

SS-260SM

BAV99L Dual Diode

BAV99L Dual Diode

SS-260SM

SS-260SM

MMBZ5240BL 10V Zener Diode SS-1052

BAV99L Dual Diode SS-260SM

SS-143SM

SS-143S

SS-207SM

SS-730SM

SS-730SM

CC-0233

SS-143SM

CC-0233

SS-207SM

J1 Input Jack, Combo

Dual Binding Post

Binding Post Back Plate

Binding Post Mounting Nut

Line Cord Socket

Line Cord 14/3

Surge Limiter

Fuse Holder, Cap

Fuse Holder, Body

Fuse Holder Washer

Fan, 80x25mm, 24VDC

Level Control Cover

Level Control Knob

Adhesive Feet

DPDT Slide Switch

DPDT Slide Switch

DPDT Slide Switch

Power Switch

Line Fuse, 15A Slo Blo

Thermistor 10k, NTC

Tranformer

Rack Handle

Rack Ears

CC-0588

CC-0867

HW-0908

HW-0905

CC-0918

FA-0209

FA-1000-B

FS-0828

FS-0829

FS-0827

FAN-0990

HP-0878

KN-0838

HWH-169

SW-0280

SW-0280

SW-0280

SWH-152B

FS-015SB

SS-0426-066

TT-0958-B

HW-1017-A

SM-1016-C

P7000 F

UNCTIONAL

B

LOCK

D

IAGRAM

XCard

Positive Input

Buffer

U1A

Crossover

U7A

Level

Control

R24

Input Buffer

U2a

Current Mirror

Q104, Q105

DIABLO

R73, CR16

Q17, Q18

Driver Cascode

Q9, Q10

Bias

Adjust

R136

Local

Feedback

Output

Q30, Q31,

Q32, Q33

B+

+94V

Balanced

Signal

CMRR

Adjust

R8

Differential Amp

Q6, Q7

Feedback

Network

Output

DC Offset

Integrator

U2B, C22, C21,

R11

Negative Input

Buffer

U1B

Crossover

U7B

XCard

Soft Start

Switch Delay

Q1, C29, R13

Current

Source

Q103

Driver Cascode

Q11, Q12

Output

Q40, Q41,

Q42, Q43

B–

–94V

– 12 –

CIRCUIT OPERATION trans•nova Implementation

The transistor Q1 is configured to operate as a switch which controls the current source, Q103, of the input differential amp, Q6 and Q7. When Q1 is off the emitter voltage is low turning off Q103. Timing of the Soft Start function is controlled by the charging time of C29 through R13. The THERMAL Protection circuit uses Q1 to shut down the channel when excessive heat is detected. The OVERLOAD protection switch Q5 and Q4 turn off Q3 directly when a short is detected on the output.

U1A and U1B are buffer amps configured as unity gain, non-inverting voltage followers which feed the crossover filters

U7A and U7B. The feedback components which control the crossover functions are contained on the XCard plug-in module. The output of the filters is fed to the attenuator network controlled by R24. The output of U2A and U7B is connected to the input of the differential amp. U2B is configured as a DC servo integrator to null the input offset currents.

The output of the differential amp is fed to the driver stage by Q17 and Q18 which perform the DIABLO transconductance steering function. The cascode pairs Q9, Q10 and Q11, Q12 supply the signal voltage and current needed to drive the output stage Q30, Q31, Q32, Q33 and Q40, Q41, Q42, Q43. Class AB bias current is controlled by R136. Loop feedback is supplied by the network R1 and C1, and global feedback by R10, C8 and C41.

Adjusting Bias:

The bias control establishes the quiescent Class AB output current of the amplifier. The bias should not need readjustment from the factory setting; however, if the amplifier is repaired and output devices have been changed, or if the two channels of the amplifier do not run at the same temperature, recalibrating the bias is necessary. Disconnect

the power to the amplifier before removing the cover. To adjust the bias, disconnect the input and speakers and remove the jumper JW7. Connect an amp meter across the exposed pins. The correct polarity is marked adjacent to the jumper.

Adjust R136 to get a current reading of 400mA.

Calibrating Common Mode Rejection:

The input common mode null is adjusted by the trim pot R8. The CMRR should be greater than 75dB below rated output.

If the CMRR requires adjustment, feed the amplifier input with a common mode signal and adjust R8. Disconnect the

power to the amplifier before removing the cover. Use a sinewave generator set to 1 volt output at 1kHz. Connect the generator signal output to the tip and ring of a 1/4" plug and ground to the sleeve. Plug this into the amplifier input.

Connect an AC voltmeter to the amplifier output binding posts. Adjust R8 to give the lowest voltage output from the amplifier. For a temporary adjustment when a signal generator and voltmeter are not available, use an FM tuner and tune it to an unused station as your signal source, and connect the output to the amplifier as described above. Connect the amplifier output to a small full range speaker. Turn the amplifier level controls full down and turn the amplifier on.

Turn up the level control until you hear a signal through the speaker. Alternate between adjusting R8 for the lowest output signal and increasing the input control until you have the level control full. There should be a very low output from the amplifier if any is detected at all.

– 13 –

Fan Speed Regulation

Driver

U9A

Temp

TS1, R25

Fan Drive

Amp

Q20, Q19

Trip Switch

U9B

Cooling air for each channel is provided by a DC fan. The fan is configured to track the heatsink temperature, and increases in speed as the amplifier runs hotter. The heatsink temperature, Temp, is determined by the voltage divider

TS1 and R25. When the amplifier is turned on the fan will stay off until the Temp voltage exceeds the reference voltage on pin 6 of the Trip Switch U9B and drives the output high to turn on the Fan Drive Amplifier, Q20 and Q19. The Driver

U9A is configured as a linear amplifier and controls the output of the Fan Drive Amp to vary the fan speed.

Output Short Protection

Clip Detector

U3A

Drive

Signal

Comparator

U3B

Shut Down

Switch

Q5, Q4

Clip Detector

U4A

Short Latch

U4C, CR14

Comparator

U4A

Short

Indicator

CR1

Output

Signal

The Short detector monitors the Drive Signal and Output Signal levels and shuts down that channel when a shorted output condition is detected. Recovering from the Short protection requires turning the amplifier off to reset it.

The Clip Detectors U3A and U4B monitor the Drive Signal and change state when the drive signal level is sufficient to clip the output stage. The output of U3A goes high when the drive signal exceeds the clip threshold, and is connected to the input of U3B. If the output signal voltage is not sufficiently positive during a clip event the output of U3B goes low. The output of U4B goes low when the drive signal exceeds the clip threshold, and is connected to the input of U4A.

If the output signal voltage is not sufficiently negative during a clip event the output of U4A goes low.

This condition, indicating high drive voltage and low output voltage, can occur only when the output is grounded. If the output of comparator stage U3B or U4A is low for the time sufficient for C26 to charge, then U4C latches low activating the Shut Down Switch Q5 and Q4, and lighting the indicator CR1. The output of U4C is held low by CR14 and will reset only after the power is turned off.

– 14 –

Thermal Protection

Soft Start Switch

Q1

Temp

TS1, R25

Comparator

U5B

THERMAL Indicator

CR2

The Thermal protection is activated, and shuts down audio operation, when the amplifier heatsink reaches an excessively high temperature. The voltage divider R22 and R23 establishes the reference voltage on pin 5 of U5B. The control voltage, Temp, on pin 4 is established by the voltage divider TS1 and R25. TS1 is a NTC (Negative Temperature

Coefficient) thermistor, mounted on the heatsink. As TS1 warms and the resistance falls, the voltage on pin 4 rises. When the voltage on pin 4 exceeds the voltage on pin 5, the output on pin 2 goes low, shutting down the Soft Start switch Q1 and lighting the THERMAL indicator.

Clipping Indicator

Drive

Signal

Clipping

Detector

U5A

LED Driver

U5C

CLIP Indicator

CR3

The CLIP indicator is driven by the buffer U5C which is controlled by the comparator U5A. The voltage divider R56 and R57 established the reference voltage for the clipping detector at pin 7 of U5A. The reference voltage scales the output of U5A to indicate when the Drive Signal, at pin 6, demands in excess of the available voltage or current of the output stage. The output of U5A is stretched by R55 and C30 to prevent the CLIP indicator CR3 from flickering. Hysteresis is applied to the LED driver U5C by R53 to stabilize the output during input transitions.

Signal Present Indicator

Amplifier

Output

Signal

Detector

U5D

LED Driver

Q8

SIGNAL

Indicator

CR4

The SIGNAL indicator is controlled by the comparator U5D and the transistor Q8. The amplifier output is connected to the input pin 9. The voltage divider R58 and R59 scales the output voltage to change the comparator output state at an equivalent input voltage of 30mV. The output at pin 14 controls the transistor Q8 to shunt across and turn off the LED

CR4.

– 15 –

AMPLIFIER MODULE REPLACEMENT

The amplifier modules have been designed to eliminate the need for a special workplace if a field exchange becomes necessary. All wire connections are made with quick connect terminals so soldering is not necessary. The following tools are needed to disassemble the amplifier:

Allen wrench, 9/64

Phillips screwdriver, #1 tip

Thin nose pliers

Small cutters

Remove the four Phillips head screws, located on the rear panel, which secure the input jacks. Remove the six 9/64

Allen screws that hold the cover. These are located along the top edge, two on each side and two on the rear. Lift the cover from the rear and remove it. Remove the level control knob. The wire harnesses have been bundled for neatness.

Cut the ties to free the bundles.

Disconnect the red and black output wires from the binding posts and the fan and power wires from the amplifier drive card. Disconnect the transformer secondary wires from the bridge rectifier and PC board. Unplug the gray mono cables.

The heatsink is attached to the chassis by three screws, two outside and one inside. Remove the two 9/64 Allen screws on the bottom edge of the side of the amplifier. Remove the Phillips screw located behind the level control, which is accessible through the hole in the PC board. The module can now be lifted from the chassis.

Prepare a new Channel 1 module for installation by setting the input mode switches to the default position according to the markings adjacent to the switches. Prepare a Channel 2 module by duplicating the switch settings of the module which was removed.

Install the new module and check the position and alignment of the indicator LEDs. Replace the level control knob and check the alignment while securing the module.

Plug in the gray mono cables. The headers are marked with the proper position for Channel 1 and Channel 2. The plugs are oriented so the cable will fit properly in one direction only.

Reconnect the remaining wires according to the following chart.

Wire Color

Red

Black

Orange (two)

White

Red

Blue

White/Blue

Blue (two)

Function

Audio Output

Output Ground

High Voltage AC

High Voltage Center Tap

High Voltage DC Positive

High Voltage DC Negative

Low Voltage Center Tap

Low Voltage AC

Terminal

Red Binding Post

Black Binding Post

Bridge Rectifier AC

CTI

+ Red

– BLUE

CT2

LV1, LV2

– 16 –

BUILDING CUSTOM XCARDS

The XCard crossover control modules used in the P7000 are a versatile and inexpensive method for configuring the amplifier for a wide range of system applications. The XCard eliminates the need for an external crossover or expensive plug-in accessories for multiple amp applications. By having the crossover built into the amplifier input circuit and with the XCard containing all the components controlling the operating frequency, it is very simple to customize to meet system specific requirements. Each amplifier, as supplied, has two 100Hz Butterworth aligned XCards each of which contains two resistors and two capacitors to control the crossover frequency. The XCard will operate as either a highpass or low-pass filter, depending upon its orientation. The following tools are needed to build the XCards:

Soldering Iron (appropriate for PC board work)

Solder (suitable for electronics)

Desoldering Braid

Our tests have shown that for operating frequencies at 100Hz and lower using 0.047

µ

F capacitors results in more linear crossover control. For frequencies above 100Hz use 0.022

µ

F, the voltage rating should be a minimum of 10V.

Use 1/8 or 1/4 watt 1% metal film resistors. Solder the components to the card according to the following diagram.

Crossover C rd

Hi P s

Lo Pa s

Ful Ra ge

LL

– 17 –

RESISTOR CHART

The following charts list the resistor values to use for common crossover frequencies.

Butterworth Alignment Q = .707

1% resistors used with 0.047

µ

F capacitors

Butterworth Alignment Q = .707

1% resistors used with 0.022

µ

F capacitors

700Hz

800Hz

900Hz

1kHz

1.2kHz

2kHz

3kHz

4kHz

80Hz

84Hz

90Hz

200Hz

300Hz

400Hz

500Hz

600Hz

5kHz

6kHz

7kHz

8kHz

Frequency

20Hz

25Hz

30Hz

35Hz

40Hz

45Hz

50Hz

55Hz

60Hz

65Hz

70Hz

75Hz

6.65k

Ω

5.62k

Ω

4.75k

Ω

4.22k

Ω

3.74k

Ω

3.40k

Ω

2.8k

Ω

1.69k

Ω

48.7k

Ω

45.3k

Ω

42.2k

Ω

40.2k

Ω

37.4k

Ω

16.9k

Ω

11.3k

Ω

8.45k

Ω

R1

169k

Ω

133k

Ω

110k

Ω

95.3k

Ω

84.5k

Ω

75k

Ω

68.1k

Ω

61.9k

Ω

56.2k

Ω

52.3k

Ω

1.10k

Ω

845

Ω

665

Ω

562

Ω

487

Ω

422

Ω

6.65k

Ω

5.62k

Ω

4.75k

Ω

4.22k

Ω

3.74k

Ω

3.40k

Ω

2.8k

Ω

1.69k

Ω

48.7k

Ω

45.3k

Ω

42.2k

Ω

40.2k

Ω

37.4k

Ω

16.9k

Ω

11.3k

Ω

8.45k

Ω

R2

169k

Ω

133k

Ω

110k

Ω

95.3

Ω

84.5k

Ω

75k

Ω

68.1k

Ω

61.9k

Ω

56.2k

Ω

52.3k

Ω

1.10k

Ω

845

Ω

665

Ω

562

Ω

487

Ω

422

Ω

700Hz

800Hz

900Hz

1kHz

1.2kHz

2.0kHz

3.0kHz

4.0kHz

80Hz

85Hz

90Hz

200Hz

300Hz

400Hz

500Hz

600Hz

5.0kHz

6.0kHz

7.0kHz

8.0kHz

Frequency

20Hz

25Hz

30Hz

35Hz

40Hz

45Hz

50Hz

55Hz

60Hz

65Hz

70Hz

75Hz

14.3k

Ω

12.1k

Ω

10.2k

Ω

9.9k

Ω

8.6k

Ω

7.15k

Ω

6.04k

Ω

3.57k

Ω

102k

Ω

95.3k

Ω

90.9k

Ω

84.5k

Ω

80.6k

Ω

35.7k

Ω

23.7k

Ω

17.8k

Ω

R1

357k

Ω

287k

Ω

237k

Ω

205k

Ω

178k

Ω

162k

Ω

143k

Ω

130k

Ω

121k

Ω

110k

Ω

2.37k

Ω

1.76k

Ω

1.43k

Ω

1.21k

Ω

1.02k

Ω

909

Ω

14.3k

Ω

12.1k

Ω

10.2k

Ω

9.9k

Ω

8.6k

Ω

7.15k

Ω

6.04k

Ω

3.57k

Ω

102k

Ω

95.3k

Ω

90.9k

Ω

84.5k

Ω

80.6k

Ω

35.7k

Ω

23.7k

Ω

17.8k

Ω

R2

357k

Ω

287k

Ω

237k

Ω

205k

Ω

178k

Ω

162k

Ω

143k

Ω

130k

Ω

121k

Ω

110k

Ω

2.37k

Ω

1.76k

Ω

1.43k

Ω

1.21k

Ω

1.02k

Ω

909

Ω

To calculate the resistor value for a frequency not on the chart use the following:

3386 fo

7234 fo

= R (in k

= R (in k

Ω

Ω

) for .047

) for .022

µ

µ f cap f cap

The actual formula is: R =

2

π

1 foc

Where: R =

Ω fo = desired crossover frequency c = capacitor in farads ex: .047 x 10-6 for .047mf cap

– 18 –

S

E R V I C E

P

O L I C Y A N D

L

I M I T E D

W

A R R A N T Y

If you encounter any difficulty or have any question concerning your P7000 Amplifier, please call our Technical Support

Department weekdays, 8:00 a.m. to 3:30 p.m., Mountain Standard Time, at 800-743-3526.

Should you have any doubts as to whether the amplifier is malfunctioning and requires service, please call us before sending it in for repair. All units being returned (regardless of warranty status) must receive a Return Authorization (RA) number. In addition, we can offer troubleshooting assistance that may simplify or even eliminate the need for factory service.

The Hafler P7000 Amplifier is warranted to the original owner (non-transferrable) for seven years from the date of purchase, including parts, labor, and return shipping costs within the Continental United States, Alaska, and Hawaii.

This warranty applies only to products sold in the United States of America.

For warranties outside the U.S.A., please contact your local agent.

It is the owner’s responsibility to pay shipping (preferably United Parcel Service, UPS) to the factory: collect shipments will not be accepted. Units under warranty should be accompanied by a copy of the dated Bill Of Sale. Use the original carton and all packing material, with the RA number clearly marked on the outside of the package. Be sure to include a return address, the RA number, a daytime telephone number, and a brief description of the difficulty, including whether it occurs continuously or intermittently.

This warranty gives you specific legal rights. You may also have other rights which may vary from state to state.

– 19 –



HAFLER PROFESSIONAL

A DIVISION OF

ROCKFORD CORPORATION

546 SOUTH ROCKFORD DRIVE

TEMPE, ARIZONA 85281 U.S.A.

IN U.S.A. (602) 967-3565

IN CANADA, (604) 942-1001

IN EUROPE, FAX (49) 4207-801250

IN JAPAN, FAX (81) 559-79-01265

MAN-0963-B

9/95