Diamond | HEX HA 700.2 | Installation manual | Diamond HEX HA 700.2 Installation manual

HA 700.2 | HA 700.4 | HA 750.1
Thank you for choosing a Diamond Audio Technologies HEX amplifier. We sincerely believe that HEX amplifiers have the very best performance
and value. DAT products are engineered and produced with the highest quality materials and incorporate the latest technology. We think you
will find your new HEX amplifier meets or exceeds your expectations and provides excellent value.
Properly installed, your new HEX amplifier will provide years of high quality sonic reproduction. Before installing the HEX amplifier in your vehicle,
please read the entire manual carefully. It is required reading for the protection of your vehicle and for the maximum performance of your mobile
audio system. All HEX amplifiers have been extensively tested and “burned-in” for maximum reliability. If after reading this manual, you still
have questions regarding this product, we recommend that you contact your authorized DAT dealer for expert installation assistance.
If you need assistance with repair or warranty, detailed warranty and return/repair information is listed in the back of this manual. Be sure you
record your serial number, model number and date of purchase for your HEX amplifier as this will be necessary for any returns.
Please Practice Safe Sound!
Continuous exposure to sound pressure levels over 100 dB may cause permanent hearing loss. High powered mobile audio systems may produce
sound pressure levels well over 130dB. Use common sense and practice safe sound.
All Diamond Audio HEX Series Amplifiers Feature:
• Pulse Width Modulated (PWM) MOSFET Switching Power Supply
• Extruded Aluminum Heatsink
•Nickel Plated Panel Mount RCA Low Level Audio Inputs
•Nickel plated, low resistance power and speaker connector blocks
• Power ON and Protection LED Lighting for Easy Diagnostics
• Thermal, Short Circuit, and Overload (Low Impedance) Protection
• Chassis mounted ATC/ATO type automotive fuses
• Proudly Designed and Engineered in the USA
HA 700.2 / HA 700.4 / HA 750.1 Features
•Class D Amplifier Topology
• Bridgeable Output Capability (4 Ohms)
•Stable into 2 Ohm Stereo Loads (1 ohm on HA 750.1)
• 12 dB bass boost on HA 750.1
• Internal 24dB/Octave High Pass or Low Pass Filter (35-350Hz)
•Crossover frequency range on the HA750.1 is 35Hz-250Hz
• Versatile for Either Full Range or Subwoofers (HA700.2 & HA700.4)
• Pass -Thru Line Output for Daisy Chaining Amplifiers
• Remote Level Control on HA 750.1
• HA 750.1 is Sync capable
Frequency Response:
Signal to Noise Ratio:
Channel Separation
THD+N(Total Harmonic Distortion + Noise)
RCA Input Sensitivity:
Min to Max Voltage requirements High/Low Pass Crossover:
Crossover Configuration:
20Hz to 20KHz +/-1 dB
>83dBA (20 to 20kHz)
<0.4%(Output-1W 4 Ohms)
150mV to 5V
9V to 15.5V DC
Variable From 35-350Hz
Switchable (OFF/HP/LP)
Frequency Response:
Signal to Noise Ratio:
Channel Separation
THD+N(Total Harmonic Distortion + Noise)
RCA Input Sensitivity:
Min to Max Voltage requirements High/Low Pass Crossover:
Crossover Configuration:
20Hz to 20KHz +/-1 dB
>83dBA (20 to 20kHz)
<0.4%(Output-1W 4 Ohms)
150mV to 5V
9V to 15.5V DC
Variable From 35-350Hz
Switchable (OFF/HP/LP)
Frequency Response:
Signal to Noise Ratio:
THD+N(Total Harmonic Distortion + Noise)
RCA Input Sensitivity:
Min to Max Voltage requirements Low Pass Crossover:
Crossover Configuration:
Bass EQ
20Hz to 250Hz +/-3 dB
>101dBA (20 to 20kHz)
<0.4%(Output-1W 4 Ohms)
150mV to 5V
9V to 15.5V DC
Variable From 35-250Hz
Low Pass
0 to +12dB @ 50Hz (Variable)
HA 700.2
2-Channel Amplifier
700 Watts RMS Output Power
(All Channels Driven):
(Into 4 Ohms)
(Into 2 Ohms)
(Bridged into 4 Ohms)
200w x 2
350w x 2
700w x 1
HA 700.4
4-Channel Amplifier
700 Watts RMS Output Power
(All Channels Driven):
(Into 4 Ohms)
(Into 2 Ohms)
(Bridged into 4 Ohms)
100w x 4
175w x 4
350w x 2
HA 750.1
Mono Amplifier
750 Watts RMS Output Power
(Into 4 Ohms)
(Into 2 Ohms)
(Into 1 Ohm)
250w x 1
450w x 1
750w x 1
Connections and Controls
This section describes how all of the terminals and adjustments of HEX Series amplifiers function.
4 gauge power and ground wire is recommended for all models.
RCA Input and Pass-Thru Output - These RCA jacks allow for a normal Left and Right channel signal input. Simply connect to the
source unit using RCA type audio cables, keeping them away from power wiring wherever possible. On the 4 channel amplifier
(HA 700.4) “Front” and “Rear” input jacks are present. The“Pass-Thru” output allows the signal to pass on to other amplifiers.
The Pass-Thru output is unaffected by the onboard crossover.
Input Gain Adjustment - This control matches the preamp stage of the HEX amplifier to your source unit. This is NOT a volume
control. The range is between 150mV and 5V.
ON / OFF Crossover Selection Switch - This switch allows you to turn on or off the crossover. In the OFF position, the crossover
selection switch and adjustment knob have no effect. The HA 750.1 is only available as Low Pass.
Crossover Selection Switch - This switch allows you to select the crossover. Use High Pass for midrange or high frequency speakers.
Use Low Pass for subwoofers. The HA 750.1 is only available as Low Pass.
Crossover Adjustment - Use this adjustment to select the crossover point. Remember that your choice will be directed to High
Pass or Low Pass depending upon the position of the adjacent switch.
Sub-Sonic Adjustment - This control allows you to remove the unwanted sub-sonic frequencies below the tunning frequency of a
ported enclosure. This helps to protect the woofer from over excursion.
Phase Adjustment (HA 750.1) - This control allows you to adjust the "phase" so as to align the subwoofer in "time" to the mids
and tweeters. 0 to 180 degrees of available adjustment capability. This is EXTREMLY useful to get the best and MOST bass out
of your system.
Bass Boost - This control adds 0 to +12dB (HA 750.1 only) of boost at 45Hz. Be cautious when adding boost to some subwoofer
systems as they may not be able to handle the additional low frequency boost. In the OFF position, no bass boost is added.
Master/Slave Port - This port is used in conjunction with the Master/Slave switch. This cable is nessesary to synchronize the
power supply and output stage of the slave amplifier(s) to the Master amplifier. This eliminates noise and the need to adjust the
slave amplifier(s), while increasing efficiency.
Master/Slave Switch - This switch is used when connecting multiple amplifiers. One amplifier should be assigned the MASTER and
the other(s) should be set to Slave. This will cause all of the amplifers set to Slave to function identical to the MASTER amplifier.
One remote level control knob pluged into the amplifier with the MASTER switch selected will now control both amplifiers.
Remote Level Adjustment (HA 750.1 Only) - This port is for the remote level control (included). The control is intended to allow
the user to control the level of gain up to the maximum adjustment level set on the amplifier. The control does not add additional
boost, it only attenuates the setting that is fixed at the amplifier’s control panel.
Status LED’s - These lights indicate when the amplifier is powered up normally and when there is a protection fault. See the
“Troubleshooting” section for details on what these useful indicators can tell you if there’s a problem.
Power Input Connections - These connections are for input power, chassis ground, and remote turn-on. Use a minimum of 4
gauge wiring for power and ground connections. The terminals will handle up to 4 gauge . Be sure any wiring that passes through
metal has a grommet!
Power Fuses - Standard automotive type ATC/ATO fuses are used on HEX Series Amplifiers. Always replace with the correct
fuse size. Never insert fuses of higher values. Doing so will void the warranty of your HEX amplifier. Also include a main fuse at
the connection to the vehicle battery within 18 inches (45.7 mm) of the positive battery post. It is also important to upgrade the
connection between the negative battery post and the chassis of the vehicle. This greatly reduces possibilities of weak electrical
“links” in the circuit.
Speaker Output Terminals - Connect your speakers to these terminals. Stereo connections are made as labeled. Bridged
connections use the LEFT + and RIGHT - as the two connections. The 2 and 4 channel amplifiers will perform into 2 Ohm stereo
loads or 4 Ohm bridged loads. DO NOT run 2 Ohm bridged loads on these amplifiers! The HA 750.1 is the only amplifier in the
series capable of driving a load as low as 1 Ohm.
Installation Guidelines
Tools and Supplies
Listed below are the tools and supplies needed to complete this installation:
Volt/Ohm Meter
Wire strippers and wire cutters
#2 Phillips screwdriver
Battery post wrench
Hand held drill w/assorted bits
High quality electrical tape or heatshrink tubing
Soldering iron and solder or assorted crimp connectors
Adequate Length— Power Wire (minimum 4 gauge recommended)
Adequate Length— Ground Wire (minimum 4 gauge recommended)
Adequate Length—Remote Turn-on Wire (minimum 22 gauge)
The Importance of Pre-Planning
This section focuses on some of the considerations for installing your new HEX amplifier. Pre-planning your
audio system layout and best wiring routes will save installation time. When deciding on the layout of your new
components, be sure that each component will be easily accessible for making adjustments.
CAUTION: lf you feel unsure about installing this system yourself, have it installed by a qualified technician.
CAUTION: Before installation, disconnect the negative (-) battery terminal to prevent damage to the
unit, fire and/or possible injury.
Before beginning any installation, follow these sensible guidelines:
1) Be sure to carefully read and understand the instructions before attempting to install the amplifier.
The instructions can only help you make the installation successful.
2) For safety, disconnect the negative lead from the battery prior to beginning the installation. It will
keep any unintended short circuits from damaging vehicle electronics during installation of the
3) For easier assembly, run all wires prior to mounting your amplifier in place.
4) Route all of the RCA cables close together and away from any high current wires or vehicle computers. This will greatly minimize the chances of unwanted noise.
5) Use high quality connectors for a reliable installation and to minimize signal or power loss.
6) Think before you drill! Be careful not to cut or drill into gas tanks, fuel lines, brake or hydraulic
lines, vacuum lines, or electrical wiring when working on any vehicle.
7) Never run wires underneath the vehicle. Running the wires inside the vehicle provides the best
8) Avoid running wires over or through sharp edges. ALWAYS use rubber or plastic grommets to protect
any wires routed through metal, especially the firewall.
9) ALWAYS protect the battery and electrical system from damage with proper fusing. Install the appropriate fuse holder and fuse on the +12V power wire within 18 inches (45.7 mm) of the positive
battery terminal. This is for protection of the wire running through the vehicle.
10) When grounding to the chassis of the vehicle, scrape all paint from the metal to ensure a good,
clean ground connection. Grounding connections should be as short as possible, yet be adequately
connected to metal that is welded to the main body, or chassis of the vehicle. Do not use seat bolts,
trunk hinges, or poorly joined metal for grounding points.
Mounting Locations
Engine Compartment
Never mount this unit in the engine compartment. Mounting the unit in the engine compartment will
void your warranty.
Trunk Mounting
Mounting the amplifier vertically will provide adequate cooling of the amplifier. If you will be mounting
it to an existing panel, be sure it’s not prone to excessive vibration (such as mounting to the back of a
subwoofer enclosure). Excess vibration is not recommended for electronic products, amplifiers included.
Mounting the amplifier flat on the floor of the trunk will provide the best cooling, however be cautious
not to deposit baggage and other items over the top of the amplifier. Mounting the amplifier upside
down to the rear deck of the trunk will NOT provide adequate heat dissipation and will severely affect
the performance of the amplifier and is not recommended.
Passenger Compartment Mounting
Mounting the amplifier in the passenger compartment will work as long as you provide a sufficient
amount of air for the amplifier to cool itself. If you are going to mount the amplifier under the seat of
the vehicle, you must have at least 1 inch (2.54cm) of air gap around the amplifier’s heatsink. Mounting
the amplifier with less than 1 inch (2.54cm) of air gap around the amplifier’s heatsink in the passenger
compartment will not provide proper cooling and will severely affect the performance of the amplifier
and is not recommended.
Vehicle Electrical System Requirements
Amplifiers (regardless of brand name) will put an increased load on the vehicle’s battery and charging
system. DAT recommends checking your alternator and battery condition to ensure that the electrical
system has enough capacity to handle the increased load of your stereo system. Original equipment
electrical systems which are in good condition should be able to handle the extra load of any DAT amplifier without problems, although battery and alternator life can be reduced depending on your individual
listening habits. To maximize the performance of your amplifier, we suggest the use of a reserve power
Wiring the Amplifier
CAUTION: Avoid running power wires near the low level input cables, antenna, power leads, sensitive
equipment or harnesses. The power wires carry substantial current and could radiate noise into the
audio system through the audio cables.
Plan the wire routing as described in the “Importance of PrePlanning” section. Keep RCA cables close together but isolated
from the amplifier’s power cables and any high power auto accessories, especially electric motors. This is done to prevent
coupling the noise from radiated electrical fields into
the audio signal. When feeding the wires through the
firewall or any metal barrier, protect them with plastic
or rubber grommets to prevent short circuits. Leave
the wires long at this point to adjust for a precise fit
at a later time.
Prepare the power wire for attachment to the amplifier by stripping 5/8 inch (15.9mm) of insulation from
the end of the wire. Insert the bare wire into the B+
terminal and tighten the set screw to secure the cable
in place.
NOTE: The B+ cable MUST be fused 18” or less from
the vehicle’s positive battery post. Choose a location
to install a waterproof fuseholder under the hood
and ensure connections are water tight. If you do not
use the appropriate fuseholder, the connection will
eventually suffer corrosion from moisture and heat.
Main Fuse near
Wait to insert
fuse until last
Grommet in
Upgraded Ground
Power Connections
Trim the power cable within 18 inches (45.7mm) of the positive
battery post and splice in a in-line fuse holder. DO NOT install
the fuse at this time.
4) Strip 1/2 inch (12.7mm) from the battery end of the power cable
and crimp a large ring terminal to the cable. Connect the ring
terminal to the positive (+) battery post.
5) Prepare the ground wire for attachment to the amplifier by stripping 5/8” of insulation from the end of the wire, Insert the bare wire into the GND terminal
and tighten the set screw to secure the cable in place. Prepare the chassis ground by
scraping any paint from the metal surface and thoroughly clean the area of all dirt and
grease. Strip the other end of the wire and attach a ring connector. Fasten the cable to
the chassis using a non-anodized screw and a star washer.
NOTE: It is important to upgrade the ground connection between the negative (-) battery
post and the
vehicle body or chassis to achieve optimum electrical performance.
6) Prepare the REM turn-on wire for attachment to the amplifier by stripping 5/8 inch
(15.9mm) of insulation from the end of the wire. Insert the bare wire into the REM terminal
and tighten the set screw to secure the wire in place. Connect the other end of the REM
wire to a switched 12 volt positive source. The switched voltage is usually taken from the
source unit’s remote amp on lead. If the source unit does not have this output available,
the recommended solution is to wire a mechanical switch in line with a 12 volt source to
activate the amplifier.
7) Securely mount the amplifier to the vehicle or amp rack. Be careful not to mount the
amplifier on cardboard or plastic panels. Doing so may enable the screws to pull out
from the panel due to road vibration or sudden vehicle stops.
8) Connect from source signal by connecting the RCA audio cables to the input jacks at the
9) Connect the car speakers. Speakers should be 4 Ohms. If connecting one speaker per
channel as shown in the diagrams (except where noted on HA 750.1). Strip the speaker
wires 1/2” (12.7mm) and insert into the speaker terminal block, then tighten the set
screw to secure into place. Be sure to maintain proper speaker polarity. DO NOT chassis
ground any of the speaker leads as unstable operation or damage to the amplifier and/
or speaker may result.
Connecting Multiple Speakers
If you must connect more than one speaker per channel, there are two methods in which to do so:
Series or Parallel. Parallel connections are harder on the amplifier than series connections, as
the total impedance is lower compared to driving a single speaker, and the amplifier must produce
more current to drive them. The following diagrams show “bridged” connections from the amplifier.
HA 700.4 4-Channel Amplifier
FR Speaker
FL Speaker
FL Speaker
RL Speaker
RR Speaker
FR Speaker
4 Channel Mode, 1 speaker per channel
3 Channel Mode, 1 pair stereo plus one bridged channel
2 Channel Mode, both pairs of channels bridged
HA 700.2 2-Channel Amplifier
Right Speaker
Left Speaker
2 Channel Mode, 1 speaker per channel
Bridged Mode
HA 750.1 Mono Amplifier
Mono Mode (This is the only configuration for this amplifier)
If you are connecting more than one speaker per channel, please see the next section.
For more wiring options, see the Support section at www.diamondaudio.com
Installing the Remote Level Controller
The HA 750.1 comes packaged with a remote level control. This allows you to control the level
by attenuating the amplitude or increasing (up to the maximum set-point) of the amplifier’s
input gain control. This control does not add additional gain, it simply allows you to control
the level to suit your tastes.
1) Locate a position in the front of the vehicle where this will be easy to reach. Common
locations are on, in, or under the dash, in the center console, or in the glove box.
2) To mount the unit, attach the bracket using the supplied hardware to your chosen location.
3) Route the telephone style data cable back to the amplifier location and connect into the
remote level port. Test to make sure the operation is functioning.
Get Ready to Listen!
Perform a final check of the completed system wiring to ensure that all connections are
accurate. Check all power and ground connections for frayed wires and loose connections
which could cause problems. Install in-line fuse near battery connection at this time. Prepare
to make some adjustments to fine tune your audio system for optimum performance.
Adjustment of Input Gain
To adjust the gain setting, turn the amplifier gains all the way down (counterclockwise).
Turn the source unit volume up until distortion is audible and then turn it down a bit until
the distortion is inaudible. This will be NEARLY full volume on most source units, perhaps
one or two “clicks” down from maximum volume. Next, increase the amplifier gain setting
until adequate volume is achieved.
NOTE: Ideal signal to noise and dynamic range are achieved with the gain at minimum. Most
users find adequate gain and volume is achieved at about halfway in the adjustment range.
Avoid setting the amplifier gain very high as noise and distortion will increase significantly.
For a more in depth level setting (gain adjustment) procedure, visit the DAT website at www.
Adjustment of Built-In Crossover (All Models)
Placing the switch in the OFF position sets the amplifier to Full Range. This setting allows
ALL frequencies to pass to the speakers. (Not available on HA 750.1). Placing the switch in
the ON position activates the crossover.
Placing the switch in the HP position sets the amplifier to the High Pass mode, enabling
frequencies above the cutoff point to pass.
Placing the switch in the LP position sets the amplifier to the Low Pass mode, enabling
frequencies below the cutoff point to pass.
Turn the crossover adjustment knob all the way down. With the system playing, turn the
crossover adjustment knob up slowly until the desired crossover point is achieved.
Adjustment of the Bass EQ (HA 750.1)
After setting the input gain adjustment and crossover, you may choose to add a small
amount of “boost” in the low frequency region. This bass boost adjustment is FIXED at
45HZ. Remember that the Bass Boost feature will not fix a poorly designed subwoofer
enclosure or subwoofers that didn’t sound good to begin with.
1) Make sure any bass EQ or low frequency equalization from the source unit is set to OFF
or FLAT. If you have other outboard signal processors with equalization, you should use
those to add boost first and leave the amplifier’s bass boost alone.
2) While playing the same musical selections used during the gain setting process, slowly
increase the level of the Bass EQ. You should be able to notice a demonstrable change
between 0 and +12dB. If you do not notice much difference, then it will not serve any
benefit to increase the boost further.
3) If the boost has audible benefits without adding appreciable distortion, find a level that
suits your taste. Remember: it’s much easier to construct the right subwoofer enclosure
for your listening preferences than relying on a bass boost control to do the job!
Remember that the Bass EQ feature has an optional dash mounted control included with the
amplifier that will function as an attenuator between the maximum level set at the amplifier
and 0dB of attenuation. It will not add boost beyond the level you choose at the amplifier.
It’s imperative that you read the manual fully to eliminate the possibility of mistakes made from
assumptions about how you “think” the amplifier might work versus how it’s recommended
to be installed. If the amplifier does not appear to be working, check obvious things first
such as blown fuses, incorrect wiring configurations, poor or loose connections, crossover,
Bass EQ, and gain controls set incorrectly, etc. These elements are the most common cause
of initial problems, so take your time and double check all of your work before assuming
there’s a serious problem.
Diamond Audio Warranty
Diamond Audio Technologies, (DAT) warrants this product to be free from defects in material
and workmanship for a period of one (1) year from the original date of purchase provided it
was purchased from an authorized DAT retailer within the United States. However, if this
product was installed by an authorized DAT retailer, the warranty period will be extended to
three (3) years.
This warranty is valid only to the original purchaser and is not extended to owners of the
product subsequent to the original purchaser. Any applicable implied warranties are limited
in duration to a period of the express warranty as provided herein beginning with the date of
the original purchase at retail, and no warranties, whether expressed implied, shall apply to
this product there after. Some states do not allow limitations on implied warranties; therefore
these exclusions may not apply to you.
This warranty gives you specific legal rights; however you may have other rights that vary from state
to state. If your DAT amplifier needs service, defective merchandise must be returned to your local
Authorized DAT dealer for warranty. Non-defective items received will be returned freight collect.
Freight damage and returns are not covered under warranty. Include proof-of-purchase. Warranty
expiration on items returned without proof-of-purchase will be determined from the manufacturing date code. You can confirm that a dealer is authorized for service by the display of a current
authorized dealer window decal. Any questions can be directed to the Warranty Department at
(480) 820-2075 This warranty is valid only if the product is used for the purpose for which it was
designed. It does not cover:
The cost of shipping this product to DAT’s Service Department
Damage through negligence, misuse, abuse or accident
Damage caused by exposure to water and/or excessive heat
Items scratched, dented, or physically damaged due to abuse
Items returned from unauthorized individuals or dealers
Items previously repaired by any unauthorized repair facility
International customers: please contact your International DAT dealer or distributor concerning
specific procedures for your country’s warranty policies. If you are not able to locate your local
distributor, please contact DAT for assistance at +1(480) 820-2075.
Specifications subject to change without notice.
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