Directed Electronics A1200/4 Stereo Amplifier User Manual

AMPLIFIER MODELS
A600/4
A1200/4
TABLE OF CONTENTS
Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
CEA Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Fuse Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Amplifier Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Tools/Parts for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Ground Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Charging System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Power Wire Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Power Lock Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Amplifier Bridging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Mixed Mono Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
A600/4 Front Plate Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
A600/4 End Plate Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
A1200/4 Front Plate Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .17
A1200/4 End Plate Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
A600/4, A1200/4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .21
Advanced Instrumentation Input . . . . . . . . . . . . . . . . . . . . . . . . .22
QBASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
QBASS/QBASS PLUS Specifications . . . . . . . . . . . . . . . . . . . . .23
QBASS PLUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
TC-X Crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Crossover Detent Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Input Combine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Adjusting Input Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
High Mass Internal Heatsink . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
AP-IV Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
1
CONGRATULATIONS
Thank you for choosing Precision PowerTM audio equipment.
Designed and engineered in the USA, this product combines
innovative technology with the finest materials to consistently deliver
Absolutely State of the Art™ performance, sound quality, reliability,
and value. This Precision PowerTM product reflects our commitment
to offer you unparalleled performance and quality for years of
dependable service and listening enjoyment.
SERVICE
Do not attempt to service Precision PowerTM products yourself.
Performing maintenance on your audio equipment will void the
warranty. Many parts of the Precision PowerTM product are custom
built to our specifications. Our factory parts are not made
available to anyone else nor are they for sale. Our goal is to
make sure that your Precision PowerTM product will always sound as
good as the day it was purchased. Contact your Authorized
Precision PowerTM Dealer about obtaining any warranty service
through Precision PowerTM. (See the Warranty on the outside of the
back cover).
CAUTION
Extended use of a high powered audio system may result in hearing
loss or damage. While Precision PowerTM systems are capable of
“Concert Level” volumes with incredible accuracy, they are also
designed for you to enjoy at more reasonable levels all of the sonic
subtleties created by musicians. Please observe all local sound
ordinances.
2
FEATURES
Advanced Instrumentation Input Stage
TC-X Crossover 24dB/Octave; HP/LP/FULL; 30-4kHz Crossover
Adaptive PWM Power Supply
AP-IV Protection Circuity
Fully Complementary Darlington Output Stage
QBASSTM Bass Boost (A600/4)
QBASS PlusTM Bass Boost (A1200/4)
High Voltage Input Capability with -12dB Attenuation Switch
Gold Plated RCA Input and Output Connectors
PowerLockTM Speaker and Power Wire Connectors
Mixed Mono/Stereo Operation
WHAT’S INCLUDED
Amplifier (with speaker and power plugs mounted)
(4) Mounting screws and washers
2mm hex wrench
2.5mm hex wrench
3mm hex wrench
CEA SPECIFICATIONS
A600/4
Power Output: 50 Watts RMS x 4 at 4 ohms and < 1% THD+N
Signal to Noise Ratio: -87 dBA (reference 1 Watt into 4 ohms)
Additional Power Output: 80 Watts RMS x 4 at 2 ohm at 14.4 Supply<1% THD+N
A1200/4
Power Output: 110 Watts RMS x 4 at 4 ohms and < 1% THD+N
Signal to Noise Ratio: -94 dBA (reference 1 Watt into 4 ohms)
Additional Power Output: 140 Watts RMS x 4 at 2 ohm at 14.4 Supply<1% THD+N
3
SPECIFICATIONS
Nominal Power Ratings
MODEL
A600/4
A1200/4
4ohm STEREO
4 X 50
4 X 100
2ohm STEREO
4 X 75
4 X 150
4ohm MONO
2 X 150
2 X 300
General Specifications
Frequency Response
Power Bandwidth
Total Harmonic Distortion + N
Input Topology
Input Sensitivity
20Hz - 20kHz
10Hz - 50 kHz
<0.05%
Instrumentation
150mV - 12 Volts RMS
(with -12dB pad)
40 kOhms
2 - 8 Ohms
4 - 8 Ohms
9 - 16 Volts
>150
>20V/µs
Up to +18dB @ 40Hz
Input Impedance
Load Impedance (stereo)
Load Impedance (bridged)
Supply Voltage
Damping Factor
Slew Rate
QBASSTM
QBASS PLUSTM
Up to +18dB Boost
@30, 36, 44, or 60Hz
12dB/Octave
30-4kHz
Crossovers
Crossover Frequency
Idle Current:
A600/4 1.0 Amps
A1200/4 1.8 Amps
Dimensions
Length
Width
Height
A600/4
21-½”
10-½”
2-¾”
A1200/4
24-¾”
10-½”
2-¾”
4
FUSE REQUIREMENTS
You will need to install an in-line fuse or circuit breaker in the power
wire within 18” of the battery. This fuse or circuit breaker is to protect
your vehicle from fire in case the power wire shorts to the vehicle
body. If you are only using one amplifier, use the fuse rating
indicated in this chart. If you are using more than one amplifier, add
up the fuse ratings for all the amplifiers. This sum is the rating for
your fuse or circuit breaker. You may also want to add a power
distribution block near your amplifiers to distribute large gauge
power cable to multiple amplifiers.
Amplifier
Fuse
A600/4
50A
A1200/4
70A
5
AMPLIFIER STATUS LEDS
1
2
The LEDs provide the following indications:
1. Power - These LEDs illuminates the center Precision Power logo
background when the amplifier power is turned on.
2. Short - These LEDs behind the PPI logo will flash to indicate a
short on the output.
2. Thermal - These LEDs behind the PPI logo will extinguish if the
amplifier is in thermal shutdown protection.
Note: Read the AP-IV Protection Circuit section for additional
information regarding Short and Thermal protection.
6
TOOLS/PARTS FOR INSTALLATION
NOTE: TOOLS ARE NOT SUPPLIED.
Small flat blade screwdriver
Phillips screwdriver (#2 or medium sized)
Wire cutters
Wire strippers
4 - #6 round head screws, and 1 - #8 sheet metal screw. (or nut, bolt,
flat washer, star washer) (see details)
2 - Ring connectors (large enough to accommodate your method of
grounding)
In-line fuse or circuit breaker
Power and ground wire
Speaker wire - 12-16 gauge
Grommets (sized to work with the power wire you plan to use in your
installation)
Tube of silicone sealant
7
WIRING
Before beginning, disconnect the negative (-) terminal of the battery
prior to connecting the amplifier to the positive (+) 12V terminal to
prevent a short to ground and potential damage to wiring and
equipment. Some vehicle radios have an anti-theft feature where
when the radio is removed from 12V the radio will no longer function
and must be code reset.
Note: The cables running from the battery to the rear of the car
should be installed on the side of the car opposite to the antenna.
When using 16 gauge wire or larger, run the speaker wires from the
amplifier location through the vehicle to the front and rear speakers.
8
Observe the same precautions for routing these wires that you
followed for running the power and remote turn on wires. Cut off
excess and, using wire strippers, strip 1/4-inch of insulation. Locate
the front speaker/remote turn-on PowerLockTM connector. Using a hex
wrench loosen the screws on the upperside of the connector. Insert
the front speaker leads into the end and secure with the hex wrench.
Check to be sure you've maintained proper polarity before securing
each wire.
Note: The amplifier comes with the connector inserted into the
amplifier with the wire clamping screws in the up position as
shown below. Use a 2mm hex head wrench to secure the wires
to the connector. If the connector needs to be unplugged from
the amplifier, use a 2.5mm hex head wrench to remove the
retaining screw from the connector (set aside and save the
retaining screw). The two negative outputs are common to each
other as are the two positive outputs. A speaker may be
connected to either terminal.
Front Speaker
POWERLOCKTM
Connector
2mm hex
wrench
Left Speaker Left Speaker +
Remote turn on
Right Speaker +
Right Speaker -
Remove retaining
screw with a
2.5mm hex wrench
9
Rear Speaker
POWERLOCKTM
Connector
2mm hex
wrench
Left Speaker Left Speaker +
Right Speaker +
Right Speaker -
Remove retaining
screw with a
2.5mm hex wrench
For the rear channels, locate the four terminal speaker PowerLockTM
connector. Using a hex wrench loosen the screws on the upperside of
the connector. Insert the speaker leads into the end and secure with
the hex wrench. Check to be sure you've maintained proper polarity
before securing each wire.
GROUND WIRING
Locate an area near the amplifier(s) that is metal and clean an area
about the size of a quarter down to bare metal. Inspect the area
around and underneath to be sure you will not drill into wires, brake
or fuel lines, etc. Drill a pilot hole in the middle of this area. Terminate
the ground wire with a ring connector and attach it to the bare metal
using a #8 sheet metal screw and washer or preferable, a bolt, nut
and a star washer. (not supplied). We suggest crimping and
soldering this connection. After the
connection is complete, coat the area
(on both sides) with silicone or some
similar material to prevent rust from
developing on the bare metal. If your grand total current draw is over
80 amps (or total power is over 500 watts). Keep the ground and
power wires as close together as possible, and use the same gauge
wire for both. This will ensure that you have a good ground path, and
may eliminate such potential problems as engine noise and
overheated amplifiers.
10
CHARGING SYSTEM
If your total current draw is over 100 amps (or total output power is
over 600 watts), you are probably exceeding the capability of your
charging system. Dimming lights and fluctuating voltage are solid
indicators that you need to upgrade your alternator, battery, or both.
You should also check the condition and current capacity of the
stock battery negative cable and connections, and replace or
upgrade as necessary. Keep in mind that your amplifiers simply
convert electrical energy to acoustical energy, and any electrical
deficiency will compromise the performance of your sound system.
For more information about charging system upgrades, see you
local authorized Precision PowerTM Dealer or call Precision PowerTM
Technical Support at 1-800-62POWER x2033.
CURRENT DRAW
The following is a basic formula to be used as a guide to determine
current draw. Your new amplifier is more efficient than most other
amplifiers. This formula is to be used as a guideline. Using wire of a
larger gauge can only improve the current transfer of your system.
Do NOT use smaller wire gauge.
Total RMS output X 1.5 = Total Input Wattage
Total Input Wattage = Current Draw (in Amps)
Supply Voltage
Example: Your new amplifier has four channels at 250 watts per
channel RMS rating into 4 ohms (250X4 = 1000 watts).
You would use the formula in the following way:
1000 W X 1.5 = 1500 watts
1500W = 125 Amps total current draw
12V
If the same amplifier is driven into a 2 ohm stereo or 4 ohm mono
11
load, double its 4 ohm RMS rating. These amplifiers will effectively
double their power at this load.
1000W X 1.5 X2 = 3000 watts
3000W = 250 Amps total current draw
12V
If you are using more than one amplifier, add up the total current
draw for all of them and choose the appropriate gauge based on the
grand total.
POWER WIRE SIZE
A minimum of 8 gauge or a maximum of 4 gauge wire is
recommended dependent on the application.
The ground wire must be the same gauge as the power wire.
12
POWER LOCK CONNECTORS
Once you have run both the power and ground wires, then connect
the cables to the amplifier. Cut off excess wire, and using wire
strippers, strip the ends of the power and ground cables
approximately 1/4 inch. Locate the PowerLockTM power and ground
connector (supplied). Using a hex wrench, loosen the screws before
attempting to insert the cable wires. Insert the wires into the
appropriate hole, and tighten the screws. The Power/Ground
PowerLockTM will accommodate 4 gauge wire for these amplifiers.
Note: The amplifier comes with the connector inserted into the
amplifier with the wire clamping screws in the up position as
shown below. Use a 3mm hex head wrench to secure the wires
to the connector. If the connector needs to be unplugged from
the amplifier, use a 2.5mm hex head wrench to remove the two
retaining screws from the connector (set aside and save the
retaining screws).
3mm hex
wrench
Power wires
Remove retaining
screw with a 2.5mm hex
wrench
Connection to
amplifier
AMPLIFIER BRIDGING
Pairs of channels in these multi-channel amplifiers are capable of
being bridged into a 4 ohm mono output without switches or bridging
modules. This feature permits the creation of a mono channel for a
13
suitable subwoofer or center channel. Deriving the mono channel is
accomplished by using the Left Channel Positive wire (L+) as the
positive speaker wire and the Right Channel Negative wire (R-) as
the negative speaker wire.
Note: It is important that a minimum 4 ohm impedance is observed.
If the impedance drops below 4 ohms while the amplifier is wired in
the bridged configuration, the amplifier’s protection circuitry may
engage.
MIXED MONO OUTPUT
The ability to run stereo speakers while simultaneously running a
mono output from the same amplifier is accomplished by running
the stereo speakers normally and tapping into the appropriate wires
for the “mixed mono” channel (left channel positive for the positive
speaker wire and right channel negative for the negative speaker
wire). Speaker impedance should be no lower than 2 ohms on the
stereo channels and 4 ohms on the mono channel.
Note: Passive crossovers must be used for “mixed mono” operation.
Choose a low pass crossover around 100Hz for your subwoofer,
then choose a high pass crossover for your stereo channels. The
high pass crossover must be at the same or slightly higher
frequency than the low pass crossover to maintain the correct
impedance. See your PrecisionPower dealer or call 1-80062POWER for more information about passive crossovers.
14
A600/4 FRONT PLATE DIAGRAM
20
19
18
17
FREQ
FULL
SUM
REAR
LP
LP
HP
30
4K
OUTPUTS
FULL
16
15
14
FREQ
GAIN
LP
HP
12
INT
EXT
LP
30
HP
FULL
13
4K
MIN
MAX
REAR
SOURCE
1
RR+
2
RL+
RL-
FR-
FR+
REM
BRIDGED
3
FL+
OUTPUT
REAR
FRONT
LP
HP
FULL
SOURCE
0
BRIDGED
R
10
30
FULL
QBASS
RR-
11
+12dB
FL-
4
ATT
-12dB
5
4K
HP FREQ
GAIN
L
MIN
MAX
OUT
IN
IN
FRONT
6
7
8
9
1. Cooling Plenums: Maintain a minimum 2” clearance around
cooling plenums for proper amplifier cooling.
2. Rear Speaker Connector: Speaker PowerLockTM connector.
3. Front Speaker/Remote Connector: Speaker PowerLockTM
connector.
4. QBASSTM Level Control: Controls bass boost, centered at 40Hz
with up to 18dB of boost.
5. -12dB Attenuation Switch: Push this switch ‘IN’ for high voltage
input (4V-12V) capability. This button must be pushed ‘IN’ for use
with speaker level input on common ground head-units or for high
voltage line drivers.
6. RCA Output: RCA outputs provide HP/LP/FULL 30-4kHz signal
to another amplifier.
7. Rear Inputs: Plug in the rear RCA leads from your source here.
8. Front Inputs: Plug in the front RCA leads from your source here.
9. Front Gain: Use this control to match the output level of the
source unit to the front channel of the amplifier.
10. Front Freq. Control: Move this detented control in a clockwise
direction to adjust the front crossover frequency from 30Hz to4 kHz.
(see Crossover Frequency chart in this manual).
11. Front HP/LP/FULL Switch: Select the desired crossover
setting. HP/LP/FULL for the speaker output signal of the front
channel.
15
12. Rear Input INT/EXT Switch: Select the INT position if you want
to use the internal signal path from the front crossover for the rear
input, or the EXT position to use the external rear RCA input.
13. Source HP/LP/FULL Switch: Select the desired setting.
HP/LP/FULL for the internal signal from the front channel to the rear
channel when not using an external rear RCA input.
14. Rear Gain: Use this control to match the output level of the head
unit to the rear channel of the amplifier.
15. Rear Freq. Control: Move this detented control in a clockwise
rotation to adjust the rear crossover frequency from 30Hz to 4kHz.
(See the Crossover Frequency chart in this manual).
16. Rear HP/LP/FULL Switch: Select the desired crossover setting,
HP/LP/FULL for the speaker output signal of the rear channel.
17. Source Sum/Rear Switch: Select the SUM position if you want
to use the RCA output signal summed from the front and rear audio
channels, or the REAR position to select the input off of the rear
channel only for bandpass capability.
18. Source HP/LP/FULL Switch: Select the desired crossover
setting. HP/LP/FULL for the output signal of the rear channel when
not using the SUM source input.
19. Output Freq. Control: Use this control to adjust the rear high
pass crossover frequency from 30Hz to 4kHz. (See the Crossover
Frequency chart in this manual).
20. Output HP/LP/FULL Switch: Select the desired crossover
setting. HP/LP/FULL for the signal of the output RCA.
16
A600/4 END PLATE DIAGRAM
1
2
1. Power/Ground PowerLockTM: After you have securely
connected your power and ground wires, plug in the Power/Ground
PowerLockTM connector here.
2. Cooling Plenums: Maintain a minimum 2” clearance around
cooling plenums for proper amplifier cooling.
A1200/4 FRONT PLATE DIAGRAM
21
20
19
18
FREQ
FULL
SUM
REAR
LP
LP
HP
30
4K
OUTPUTS
FULL
17
15
FREQ
GAIN
14
13
INT
EXT
LP
LP
FULL
HP
16
30
HP
4K
MIN
MAX
REAR
SOURCE
FULL
1
RR+
BRIDGED
2
RL+
RL-
FR-
FR+
REM
BRIDGED
3
FL+
FL-
R
OUTPUT
REAR
11
FRONT
LP
30
HP
FULL
SOURCE
FREQ QBASS
RR-
12
2
1
4
5
ATT
-12dB
6
4K
HP FREQ
GAIN
L
MIN
MAX
OUT
IN
IN
FRONT
7
8
9
10
1. Cooling Plenums: Maintain a minimum 2” clearance around
cooling plenums for proper amplifier cooling.
2. Rear Speaker Connector: Plug in the PowerLockTM connector
here.
3. Front Speaker/Remote Connector: Plug in the PowerLockTM
connector here.
17
4 & 5. QBASSTM 1 and QBASSTM 2 Freq.: Use these switches,
QBASSTM 1 and QBASSTM 2 to program the QBASS PLUSTM circuit
frequency.
6. -12dB Attenuation Switch: Push this switch ‘IN’ for high voltage
input (4V-12V) capability. This button must be pushed ‘IN’ for use
with speaker level input on common ground head-units or for high
voltage line drivers.
7. RCA Output: RCA outputs provide HP/LP/FULL 30-4kHz signal
to another amplifier.
8. Rear Inputs: Plug in the rear RCA leads from your source here.
9. Front Inputs: Plug in the front RCA leads from your source input
here.
10. Front Gain: Use this control to match the output level of the
source unit to the front channel of the amplifier.
11. Front Freq. Control: Move this detented control in a clockwise
direction to adjust the front crossover frequency from 30Hz to4kHz.
12. Front HP/LP/FULL Switch: Select the desired crossover
setting. HP/LP/FULL for the speaker output signal of the front
channel.
13. Rear Source INT/EXT Switch: Select the INT position (switch
in) if you want to use the internal signal path from the front crossover
for the rear input, or the EXT position (switch out) to use the external
rear RCA input.
14. Rear HP/LP/FULL Switch: Select the desired setting.
HP/LP/FULL for the internal signal from the front channel to the rear
channel when not using an external rear RCA input.
15. Rear Gain: Use this control to match the output level of the head
unit to the rear channel of the amplifier.
16. Rear Freq. Control: Move this detented control in a clockwise
rotation to adjust the rear crossover frequency from 30Hz to 4kHz.
17. Rear HP/LP/FULL Switch: Select the desired crossover setting,
HP/LP/FULL for the speaker output signal of the rear channel.
18. Source Sum/Rear Switch: Select the SUM (switch in position)
if you want to use the RCA output information summed from the
front and rear audio channels. Select the REAR (switch out position)
to select the input off of the rear channel, providing bandpass
capability.
18
19. Output Source HP/LP/FULL Switch: Select the desired
crossover setting, HP/LP/FULL for the RCA output signal.
20. Output Crossover Freq. Control: Use this control to adjust the
output crossover frequency from 30Hz to4kHz.
21. Output Crossover HP/LP/FULL Switch: Select the desired
crossover setting, HP/LP/FULL for the internal output signal of the
RCA output.
Note: See the next section for the rear panel view of this endplate.
A1200/4 END PLATE DIAGRAM
1
2
3
+18
QBASS
REMOTE
4
0
QBASS
1. Power/Ground PowerLockTM: After you have securely
connected your power and ground wires, plug in the Power/Ground
PowerLockTM connector here.
2. QBASS REMOTETM: Plug in the data cable from the optional
QBASS REMOTETM dash mounted level control here. (The remote
level control will bypass the amplifier’s on board QBASSTM control.
3. QBASS PLUSTM: Up to 18dB of bass level control boost.
4. Cooling Plenums: Maintain a minimum 2” clearance around
cooling plenums for proper amplifier cooling.
19
INPUTS
There are two sets of RCA jacks on the front end of your amplifier.
The RCA cables from your source unit go in the set labeled
INPUTS. If your source unit doesn’t have RCA outputs, then add a
set of RCA plugs (available at your dealer) to your front or rear set
of speaker leads (see drawing below). Plug them into the input
jacks, and push in the -12dB input attenuation switch.
SOURCE Headunit
eject
BASS
BALANCE
VOLUME
LEFT
1
2
3
4
5
6
7
8
Trk 1
TREBLE
TRACK
RIGHT
FOWARD
PPI
MAR
KET
ING
DPT
REVERSE
(+) Positive
LEFT input
(-) Negative
(+) Positive
RIGHT input
(-) Negative
20
A600/4, A1200/4 BLOCK DIAGRAM
INPUT ATTENUATION
INPUT ATTENUATION
21
ADVANCED INSTRUMENTATION INPUT
The Advanced Instrumentation Input has been incorporated from
the legendary Precision PowerTM 2500F1. This circuit completely
isolates the chassis ground from the audio circuit of the amplifier
and reduces noise radiated into your signal cables by up to 40dB.
This is equivalent to a noise reduction of approximately one hundred
times what the noise level would be without this circuitry. It provides
all the benefits of a true balanced line without the need of any
special cables (see diagram below). This type of input works with
any conventional RCA cables.
QBASS
For extra BOOM from your
system, we’ve developed the
QBASSTM bass control circuit.
The QBASSTM control is
located on the end plate
panel, and allows you to add
up to 18dB of boost centered
at 40Hz by rotating the control clockwise.
22
QBASS/QBASS PLUS SPECIFICATIONS
QBASSTM (A600/4)
Up to 18dB of boost centered at 40Hz, with a Q-factor of 2.
QBASS PLUSTM (A1200/4)
Up to 18dB of boost with selectable center frequency at 30Hz, 36Hz,
44Hz or 60Hz, with a Q-factor of 2.
Optional QBASS REMOTETM (A1200/4)
This boost control can be mounted in the dash and will supersede
the boost control on the amplifier endplate.
QBASS PLUS
On the A1200/4 amplifier, we’ve taken bass control to a higher level
with QBASS PLUSTM. The two QBASSTM switches (labeled 1 and 2)
on the front end of the amplifier allow you to select one of four
frequency centers 30Hz, 36Hz, 44Hz and 60Hz. On the rear end
plate you will find the QBASSTM level control and plug-in for an
optional QBASS REMOTETM dash mounted level control. Adjust the
level control clockwise for up to +18dB of boost at your selected
frequency.
23
QBASSTM Settings
1
2
Freq.
IN
IN
30Hz
IN
OUT
36Hz
OUT
IN
44Hz
OUT
OUT
60Hz
CAUTION: QBASS PLUSTM should only be used in systems with a
strong subwoofer section. +18dB is a tremendous amount of bass
boost and may damage your speakers or create excessive distortion
if abused.
The optional QBASS REMOTETM: This boost control can be
mounted in the dash and will supersede the boost control on the
endplate.
These PrecisionPower amplifiers no longer need an optional
QPORTTM to connect multiple QBASS PLUSTM equipped amplifiers
while using one QBASS REMOTETM. The new QBASS PLUSTM
circuitry in these amplifiers is now positioned before the crossover
circuit. In doing this, Precision PowerTM engineers have allowed you
to daisy chain your RCA output to the next amplifier input, causing
the first amplifier’s QBASS REMOTETM to become the master
control amplifier. See your authorized Precision PowerTM dealer for
more information!
24
TC-X CROSSOVER
Your new amplifier has a TC-X Crossover (Total Control X-over®)
30Hz-4kHz (see this guide for Crossover Chart).12dB per octave
phase correlated crossover built-in to provide superior system
flexibility without the added expense and installation of an outboard
crossover. The speaker outputs of your amplifier are high pass, low
pass, or all-pass according to the HP/LP/FULL switch on the front
endplate. You would choose low pass (middle position of switch) to
use this amplifier for subwoofers, choose high pass (left position of
switch), or full (right position of switch) to use this amplifier for full
range speakers.
The RCA outputs are controlled by a separate HP/LP/FULL switch,
and are always independent of the speaker output crossover. As
well as being able to independently select HP/LP/FULL, your new
amplifier allows independent selection of frequencies from 30Hz4kHz (see Crossover Detent Chart in this guide).
A600/4, A1200/4
Front - 12dB/Octave, Detented High Pass 30Hz-4kHz
Rear - 12dB/Octave, Detented High Pass; HP/LP/FULL
RCA Outputs - 12dB/Octave, Detented High Pass; HP/LP/FULL
QBASS PLUSTM - on Rear Channel - up to 18dB @ 30, 36, 44, 60Hz
25
CROSSOVER DETENT CHART
Detent #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Low Pass
Frequency (Hz)
@ -3dB
28
28
30
30
30
32
34
36
38
42
46
50
52
54
60
66
76
88
100
116
136
144
168
198
240
286
310
340
380
424
484
576
632
748
932
1076
1428
1700
2436
2830
2980
26
High Pass
Frequency (Hz)
@ -3dB
52
52
52
56
56
60
64
72
76
80
88
92
100
116
132
148
168
192
216
244
284
348
404
468
512
564
624
700
800
932
1036
1144
1300
1504
1812
2196
2840
4116
4540
4728
4728
INPUT COMBINE
Your multi-channel amplifier can use both front and rear outputs
from your head unit to maintain the ability to fade front to rear, or you
can run a single set of RCAs to the front inputs and push in the Rear
Input INT/EXT switch on the amplifier endplate to route the front
signal to the rear channels as well.
ADJUSTING INPUT GAIN
1. Adjust all amplifier input gain controls to just above minimum
sensitivity (fully counterclockwise).
2. Using the cleanest music source (CD) playing, turn up the head
unit source volume until you can hear distortion. Now turn it down a
bit until you cannot hear the distortion (usually just below full
volume).
3. Increase the amplifier gain (clockwise) until the onset of audible
distortion. Then decrease the gain to the point just before the
distortion starts. This setting minimizes background noise and
prevents overload.
4. Repeat step 3 for any remaining independently controlled
amplifiers (rear and subwoofer gain controls) in the system.
HIGH MASS INTERNAL HEATSINK
The unique heatsink on your amplifier has been designed with fins
on the inside of the aluminum extrusion. This allows for the transfer
of heat from the circuitry to the heatsink fins and out through the
vents in the endplates. Be sure you provide ample space around the
amplifier for cooling: at least 2” on all sides.
AP-IV PROTECTION CIRCUIT
Short Circuit Protection engaged: These amplifiers will turn off and
try to come back on immediately (the status LEDs will flash). The
amplifier will cycle like this indefinitely with “blips” of sound each
time. If this is the case, check your speakers and wiring for low
impedance and short circuits.
27
Thermal Protection engaged. The amplifiers will turn off and after a
minute or so will come back on (the status LEDs will extinguish). In
this case, ensure that there is nothing blocking the normal
convection airflow of the amplifier. No obstruction should be within
2” of the amplifier on all sides.
Note: Low battery voltage will cause the amplifier to run
warmer and possibly damage the amplifier.
TROUBLESHOOTING
NO SOUND Is the LED illuminated?
YES
NO
Check Power and Remote
turn-on wire for voltage.
Make sure the ground wire
is secure.
STILL NO SOUND
See your Authorized Precision PowerTM Dealer or call 1-800-62POWER.
SOUND IN ONE CHANNEL ONLY
Reverse the left and right speakers by unplugging the speaker connector,
turning it over and plugging it back in.
SOUND IS NOW IN
OPPOSITE CHANNEL
SAME CHANNEL
Reverse RCA inputs.
Problem is in the speaker or
speaker wire of the silent
channel.
SOUND IS NOW IN
OPPOSITE CHANNEL
SAME CHANNEL
Reverse RCA inputs
Problem is in the amplifier.
at head unit.
See your local Authorized
PrecisionPower Dealer or
call 1-800-62POWER.
SOUND IS NOW IN
OPPOSITE CHANNEL
SAME CHANNEL
Problem is in the head
Problem is in the RCA
unit or before the amplifier.
cables.
28
LIMITED TWO YEAR CONSUMER WARRANTY:
Directed Electronics promises to the original purchaser, to replace this product
should it prove to be defective in workmanship or material under normal use, for
a period of two years from the date of purchase by the dealer as indicated by the
date code marking of the product PROVIDED the product was installed by an
authorized Directed dealer. During this two-year period, there will be no charge for
this replacement PROVIDED the unit is returned to Directed, shipping pre-paid. If
the unit is installed by anyone other than an authorized Directed dealer, the
warranty period will be 1 year from the date of purchase by the dealer as indicated
by the date code marking of the product. During this 1-year period there will be no
charge for this replacement PROVIDED the unit is returned to Directed, shipping
pre-paid. This warranty is non-transferable and does not apply to any unit that has
been modified or used in a manner contrary to its intended purpose, and does not
cover damage to the unit caused by installation or removal of the unit. This
warranty is void if the product has been damaged by accident or unreasonable
use, neglect, improper service or other causes not arising out of defects in
materials or construction. ALL WARRANTIES INCLUDING BUT NOT LIMITED
TO EXPRESS WARRANTY, IMPLIED WARRANTY, WARRANTY OF
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, AND
WARRANTY OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY ARE
EXPRESSLY EXCLUDED TO THE MAXIMUM EXTENT ALLOWED BY LAW,
AND DIRECTED NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO
ASSUME FOR IT ANY LIABILITY IN CONNECTION WITH THE SALE OF THE
PRODUCT. DIRECTED HAS ABSOLUTELY NO LIABILITY FOR ANY AND ALL
ACTS OF THIRD PARTIES INCLUDING ITS AUTHORIZED DEALERS OR
INSTALLERS. Unit must be returned to Directed, postage pre-paid, with:
consumer’s name, telephone number, and address, authorized dealer’s name and
address, and product description. IN ORDER FOR THIS WARRANTY TO BE
VALID, YOUR UNIT MUST BE SHIPPED WITH PROOF OF INSTALLATION BY
AN AUTHORIZED DIRECTED DEALER. ALL UNITS RECEIVED BY DIRECTED
FOR WARRANTY REPAIR WITHOUT PROOF OF DIRECTED DEALER
INSTALLATION WILL BE COVERED BY THE LIMITED 1-YEAR PARTS AND
LABOR WARRANTY. Note: This warranty does not cover labor costs for the
removal and reinstallation of the unit. BY PURCHASING THIS PRODUCT, THE
CONSUMER AGREES AND CONSENTS THAT ALL DISPUTES BETWEEN THE
CONSUMER AND Directed SHALL BE RESOLVED IN ACCORDANCE WITH
CALIFORNIA LAWS IN SAN DIEGO COUNTY, CALIFORNIA.
© 2005 Directed Electronics, All rights reserved. G48335.40 12-05