Diamond Audio D7, D7152, D7402 Reference Manual

10

LOWPASS ON/OFF

Pushing this button “IN” engages the Lowpass filter. Pushing this button
“OUT” will bypass the filter.

LOWPASS FREQUENCY

Turning this control sets the Lowpass crossover point from 50Hz (fully
counterclockwise) to 5kHz (fully clockwise).

HIGHPASS FREQUENCY

Turning this control sets the Highpass crossover point from 50Hz (fully
counterclockwise) to 5kHz (fully clockwise).

HIGHPASS ON/OFF

Pushing this button “IN” engages the Highpass filter. Pushing this button
“OUT” will bypass the filter.

X-OVER OUT

This crossover is fully independent. Signal can be parallel routed from
the CH 1/2 INPUTS (X-OVER INPUT SELECT button set to the “IN”
position) or be directly sent to this crossover via the AUX. X-OVER INPUT
RCA jacks (X-OVER INPUT SELECT button set to the “OUT” position).
This configuration allows the AUX. crossover to be used with a separate
amplifier not equipped with its own on-board crossover for the ultimate in
system flexibility.

Note: By engaging both Highpass and Lowpass filters and setting the desired

crossover points, a Bandpass filter can be created:

AUXILIARY CROSSOVER

Signal can be routed from the channel 1/2 INPUTS (X-OVER INPUT
SELECT button set to the “IN” position) or combined with the CH 3/4
INPUTS (X-OVER INPUT SELECT button set to the “OUT” position).

These signals can then be processed by the third (AUXILIARY) crossover.
This additional independent crossover can be used with a separate amplifier
not equipped with its own on-board crossover for the ultimate in
system flexibility.

11

D7 CROSSOVER FREQUENCIES

Diamond Audio D7 Professional Reference Series Amplifiers feature fully
variable crossovers. The frequency control knobs (located in the tray on the
top of the amplifier) are labeled 50Hz when the knob is rotated fully counter­clockwise (left) and 5kHz when rotated fully clockwise (right).

To make basic setting of the crossover frequencies a little easier, we’ve
come up with the following rotational diagram:

HIGHPASS/LOWPASS

FREQUENCY

Notice that the outer most circle of numbers (1:00, 2:00, etc.) represent
numbers as they appear on the face of a clock. The number underneath each
“hour” designation on the simulated clock face is the approximate crossover
frequency at that position.

BRIDGING

All pairs of Diamond Audio D7 amplifier channels are capable of being
bridged to a 4 Ohm mono output. Creation of the mono channel is accomp­lished by using the left channel positive (+) output connection of the amplifier
for the speaker positive and the right channel negative (-) output connection
of the amplifier for the speaker negative.

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9

Note: To set crossovers, first remove the two 1/16” Allen screws holding

down the security cover using the Allen key provided. When reinstalling
the cover be careful not to overtighten the screws. Damage to the cover
may result.

CROSSOVER CONTROLS: CH 1/2

As seen in the above drawing, the function of the crossover controls (from
left to right) are as follows:

GAIN

This control matches the output voltage of the source unit or processor to the
amplifier inputs. Rotating this control to the “MIN” mark (counterclockwise)
configures your D7 amplifier to accept input voltages as high as 12V RMS with
the -12dB button pushed “IN” (see “RCA INPUT” drawing on page 12). This
control should be set as low as possible. The basic procedure for setting
input gains is as follows:

1. Adjust all amplifier gain controls to just above the minimum setting
(fully counterclockwise). If your source unit output voltage is less than
6 Volts RMS, push the –12dB button for the selected channel pair to the
“OUT” position. If the available signal voltage is more than 6 Volts
RMS, push the -12dB button to the “IN” position.

2. Using the highest quality source (usually CD) play some music and
slowly turn up the source unit until you can hear distortion. Now turn
down the volume until the distortion stops. This is your maximum
source unit level.

3. Turn up the amplifier gain until audible distortion starts. Turn down
the gain to the point JUST BELOW the start of the distortion.

4. Repeat step 3 for all amplifiers in your system.

Please refer to the Diamond Audio Level Setting Technical Brief available from
the Tech Department for a comprehensive level setting procedure.

12

Note: It is important that a 4 Ohm minimum total speaker impedance load is

observed! If an impedance load of less than 4 Ohms is used, you will
eventually damage your amplifier and void your warranty.

RCA INPUTS AND OUTPUTS

As seen in the above drawing, the function of the RCA inputs, outputs,
and feature buttons are as follows:

CH 1/2 INPUT

The RCA cables from your source unit should be inserted here.

-12dB BUTTON: CH 1/2

To the right of the CH 1/2 INPUT RCAs you will find the -12dB button.
Pushing this button: “IN” allows your amplifier to accept signal voltages as
high as 12VRMS. Pushing this button “OUT” configures the amplifier to
accept signal voltages up to 6VRMS.

AUX. X-OVER INPUT

These RCA jacks allow you independent access to the AUX. X-OVER.

X-OVER INPUT SELECT

Pushing this button “IN” routes signals from the CH 1/2 INPUTS to the inputs
of the AUX. X-OVER. Pushing this button “OUT” allows independent access
to the AUX. X-OVER.

AUX. X-OVER OUT

These RCA outputs are used to provide filtered or unfiltered signals to an
outboard processor or amplifier.

By pushing the X-OVER INPUT SELECT button to the “IN” position, and
pushing the LOWPASS ON/OFF and HIGHPASS ON/OFF crossover buttons
to the “OUT” position, signals available at the CH 1/2 INPUTS will bypass
the crossover and be made available at the AUX. X-OVER OUTPUT RCAs
allowing you to “daisy-chain” multiple D7 amplifiers for the ultimate in system
design flexibility (see block diagram page 16).

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8

SPEAKER WIRING

Diamond Audio recommends using speaker wire of at least 16 gauge.
Lay out the wire in the vehicle from the individual speaker locations to the
amplifier(s). Observe safe wiring precautions.

Your D7 Professional Reference Series Amplifier will accept speaker wire
up to 10 gauge directly. Locate the speaker terminal block on the end of the
amplifier. Strip approximately 1/2 inch of insulation from the wire, insert
the wire into the terminal, and tighten the Allen screw. Repeat for all speaker
wires. Please observe our recommended minimum speaker impedances to
prevent possible damage.

Banana Jacks using up to 8 gauge wire can be inserted into the speaker block.
Remove the set screw completely and insert the Banana Jack into the end of
the block.

CROSSOVERS

All Diamond Audio D7 amplifiers employ the most flexible internal crossover
sections currently available in mobile audio. They feature third-order 18dB/
octave Butterworth filters. These filter networks sum to a flat response at their

-3dB break points. This results in a smooth and seamless transition from one
frequency band to the next. Butterworth filters provide maximally flat
frequency responses when compared to other filter structures.

All crossover controls are mounted on the top of the amplifier. Each crossover
is continuously variable from 50Hz to 5kHz. Each pair of channels has an
individual network that can be configured to Highpass, Lowpass, Bandpass or
All-pass by simple switch selection. When switched off, they are completely
out of the audio path.

Two and four-channel D7 amplifiers also provide a separate fully­independent crossover for the output RCA jacks providing filter control of
any other amplifier.

13

THERMAL MANAGEMENT SYSTEM

All D7 Professional Reference Series Amplifiers feature our Intelligent Thermal
Management System. All amplifiers feature one or two (depending

on model) internally mounted temperature-controlled cooling fans.

Care should be taken to allow adequate “breathing room” (approximately
2 inches) on all sides of the installed amplifier to allow the system to operate
at peak efficiency.

Cool outside air is drawn into the amplifier through the side vents on each
end panel. The air is then drawn over the top of the main circuit board, down
through the fan over the internal heat sink fins (in two directions) and out
through exhaust vents on the bottom of each end panel. In this way, the
cooling fan(s) remain nearly inaudible under almost all listening conditions.

When D7 amplifiers operate at high power for prolonged periods, the
temperature sensors instruct an intelligent monitoring circuit to speed up the
fan(s) until the amplifier has cooled down to its normal operating temperature.

Amplifier models D7402 and D7104 also feature our unique Power-Flow
Busbar. The shroud connecting and covering the two internal cooling fans of
these amplifiers is made of solid nickel-plated copper. Each end of this fan
shroud is soldered to full width pads on the main circuit board. The center
of this shroud is attached to the fans at eight points. The high current ground
path for the speakers now travels over the cooling fans through the shroud,
which functions as a busbar. At the same time, these high current signals are
completely isolated from the circuit board traces that carry low-level signals.

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7

POWER CABLE GAUGE CHART

14

An additional temperature monitoring circuit protects the D7 amplifier
under extreme high power or extreme high-ambient temperature conditions.
As the heat sink temperature reaches 185 degrees Fahrenheit, this circuit
gradually turns down the high-current rail voltages, reducing the amplifier
power dissipation. This circuit only effects the high current stage of the power
supply; the operation of the sensitive low current audio circuits remain
unchanged. Only the maximum output power is affected, and only until the
heat sink cools down. Under no conditions will the D7 Series amplifiers have to
shut off completely.

If a problem arises, refer to the troubleshooting section (page 15) or call the
Diamond Audio Technical Department at [phone] for assistance.

A WORD ABOUT BATTERIES

AND HIGH OUTPUT ALTERNATORS…

The battery in your car is a chemical storage device for electrical energy
generated by the alternator. It is capable of briefly supplying high currents for
cold starting the vehicle as well as powering other important electrical loads
either partially or entirely for a limited period when the engine is off.

In order to supply the power required for ignition, lighting, large audio
systems etc. a car needs its own efficient, reliable, and constantly available
source of energy. When the engine is stopped, the battery is the vehicle’s
energy source. When the engine is running, the alternator is the on-board
“electricity generating plant.” It is the job of the alternator to supply power to
all current-consuming loads (including the audio system).

Alternator output, battery capacity, and power demand of all electrical loads
and systems must be matched as ideally as possible so the entire system is
reliable and trouble-free in operation.

In the most basic of terms, this means that car audio is gasoline powered.
Extra batteries are primarily for the extended operation of your audio system
when the engine is off or for SPL competitions where high sound pressure
levels are generated for short periods of time and large battery racks are
needed to provide the necessary current demanded by the many amps used.

D7 Professional Reference Series Amplifiers are capable of reproducing “concert
level” volumes with incredible accuracy. Care must be taken to ensure that your
vehicle is capable of supplying the voltage and current required by such a
system.

Note: If you are installing multiple amplifiers, add up the total current draw for

all of them and choose the appropriate gauge based on the grand total.
Example:

Amplifier 1: D7054 (driven at 4 ohms) = 33 amps
Amplifier 2: D7152 (driven at 4 ohms) = 50 amps

Amplifier 3: D7152 (driven at 4 ohms Bridged) = 100 amps

Grand Total = 183 amps

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6

TURN-ON CONNECTION (REMOTE)

Locate the terminal labeled “REMOTE” between the ground and +12V
power connection points on the end of the amplifier. Your source unit should
have a wire in its harness labeled “REMOTE” or “AMP TURN-ON.” Some
source units come equipped with a “Power Antenna” lead only. This should
also work. Run this wire from your source unit to the amplifiers REMOTE
connection. Strip approximately 1/2 inch of insulation from the wire. Insert
the wire into the terminal, and tighten the Allen screw. Your D7 Professional
Reference Series Amplifier will accept remote turn-on wire up to
10 gauge directly.

A WORD ABOUT

POWER AND GROUND CABLE GAUGE…

The following basic formula can be used as a quick guide to determine the
total amperage draw of a mobile audio system. This formula is based on a
50% amplifier efficiency rating. Diamond Audio D7 amplifiers are more
efficient. Others may be less. Using cable of a larger gauge will only increase
the current capability of your system. Do not use cable of a smaller gauge
than suggested here.

FORMULA:

Total amplifier rated RMS power x 2 = Total Input Wattage

Total Input Wattage = Current Draw (in Amps)
Battery Voltage

EXAMPLE:

An D7152 amplifier has 2 channels at 150 Watts per channel RMS into
4 Ohms totaling 300 Watts. Work the formula as follows:

300 Watts x 2 = 600W

600W = 50A Total Current Draw
12V

If the same amplifier is being driven to a 2 Ohm stereo or a 4 Ohm mono
load, double the total wattage number:

(D7152 = 600W @ 4 Ohms Mono) x 2 = 1200W

1200W = 100A Total Current Draw
12V

15

If you are considering a high output alternator or if you are not sure if your
vehicle’s charging system needs to be upgraded, consult your Authorized
Diamond Audio Dealer. They will be happy to set you up with everything
necessary for you to enjoy a listening experience in your vehicle without equal.

BASIC TROUBLESHOOTING

1. Amplifier has no output.

Is LED (located on power/ground endpanel) lit?
Yes: Make sure audio signal is present at RCA inputs. If no signal

is present, use alternate signal source and try again. If signal is
present, check configuration of crossovers. If still no signal, contact
your authorized dealer.

No: Check power, ground and remote wire for +12V. Verify all
connections. If voltages are correct and still no LED, contact your
authorized dealer.

Note: The following steps apply to each pair of channels on your amplifier.

2. Sound in one channel only.

Reverse left and right RCA cables at amplifier inputs. Is the sound
now in the opposite channel?

Yes: Reverse the input RCA cables in every product installed
BEFORE your amplifier until the problem is found. Check RCA
cables for open connections. Repair as necessary.

No: Check the speaker or speaker wires of the dead channel
and repair as needed. If speaker and wire are OK, contact your
authorized dealer.

3. One or more pairs of amplifier channels “squeal” when
operating.

One or more speaker wires are shorted or one or more speaker voice
coils are shorted or rubbing. If speakers and wires are OK, contact
your authorized dealer.

4. Amplifier volume gets gradually softer as music is playing
without touching any system controls.

Amplifier is going into thermal protection. Make sure amplifier has
room for fan(s) to breathe. Preventing air from reaching the heatsink
will cause the amplifier to overheat, as will running the amplifier at
too low of an impedance.

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5

to the bare metal using a bolt, star washer and nut. Seal the area from above
and below to prevent rust. Strip approximately 1/2 inch of insulation from the
other end of the cable and insert it into the ground block on the amplifier and
tighten the Allen screw.

ENDPLATE DIA GRAM (POWER/GROUND REMOTE)

For multiple amplifier systems, a ground distribution block is recommended.
Cut a length of cable long enough to go from the ground distribution block to
the amplifier. Strip approximately 1/2 inch of insulation from each end of the
ground cable. Insert one end into the ground distribution block and tighten the
Allen screw. Insert the other end of the cable into the ground block on the
amplifier and tighten the screw (A ring terminal may be used here). Repeat for
each amplifier installed. Run a cable (the same gauge as the main power cable)
from the ground distribution block to the negative terminal of the system
battery.

Your D7 Professional Reference Series Amplifier is designed to accept up to
4 gauge power and ground cable when using the Direct (stripped wire end)
Connection method.

When using ring terminals to attach the power and ground, cables of up to
1/0 gauge can be used. Please refer to the Power Cable Gauge Chart (page 7)
for the minimum recommended wire gauge.

16

AMPLIFIER BLOCK DIAGRAM

(D71 52 AND D7402)

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4

warranty. Mounting your amplifier inside an enclosure is not a good idea unless
the enclosure is equipped with ventilation fans to circulate fresh air through the
enclosure.

Your new D7 amplifier features adjustable mounting flanges. Should they need
to be moved to a different location, remove the self-tapping screws on the
bottom of each mounting flange. Move the flange to the desired location.
Carefully tighten the self-tapping bottom screws. Be careful not to overtighten
these screws or damage to the head of the screws or stripping of the threads
will result.

POWER/GROUND

D7 amplifiers need proper power and ground connections to deliver maximum
performance and efficiency. This is typically the least understood part of the
installation process. Voltage drops due to poor quality connections and/or poor
grounding practices will rob your audio system of power that could be used for
listening to music. These voltage drops will create increased current draw and
will make it easier for noise to enter your system.

Your new amplifier has a fully regulated power supply. It is designed to make
full power even if the voltage changes. It will draw more current at lower
voltages to make that power. Try to ground your system to a single point in
the vehicle.

The gauge of the power and ground cables must be capable of handling the
current needed by the entire system. Power and ground cables must be of the
same gauge. If the alternator is not capable of supplying enough power for
both the vehicle AND the audio system, a high output alternator should be
installed for best performance.

POWER (+12V)

Strip approximately 1/2 inch of insulation from the end of the power cable
going to the amplifier. Insert the stripped cable into the power block on the
end of the amplifier and tighten the Allen screw. A ring terminal may also be
used directly at the power block. Repeat for each amplifier installed.

GROUND

For low power systems, locate a fairly thick metal area near the amplifier(s).
Inspect around and under the chosen area to make sure you won’t drill into
wires, brake or fuel lines, computers, etc. Remove any paint and carpet glue to
a spot approximately 1 inch in diameter. Drill a hole into the middle of this
area. Cut a length of ground cable long enough to go from the ground point to
the amplifier. Terminate the ground cable with a ring connector and attach it

17

SYSTEM DIAGRAM 1

Basic Biamp System:
Dual 2 Channel Amplifiers

D7 two channel amplifier
Source: Front RCA outputs

? Channels 1/2 Highpass to a pair

of components

D7 two channel amplifier
Source: Rear outputs

? Channels 1/2 Lowpass to a

bridged 4 Ohm subwoofer

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3

INST ALLATION

TOOLS NEEDED FOR INST ALLATION

? 1/16" Allen Key (Included): Crossover Security Cover Top Screws
? 3/16" Allen Key: Up to 1/0 AWG Power Rings, Power / Ground
? 5/32" Allen Key: Up to 4 A WG Direct Input, Power / Ground
? 1/8" Allen Key: Up to 8 AWG Speaker and Remote Terminal

(Also Accepts Banana Jacks)

? 7/64" Allen Key: Amplifier Mounting Flanges

A WORD ABOUT PROFESSIONAL INSTALLATION…

We, the folks at Diamond Audio, highly advise the use of a factory authorized
installation technician. System performance ultimately depends on proper
installation. Your D7 Series amplifier is an awesome component that deserves
to be professionally installed. If this last-chance plea for dealer assistance
doesn’t sway you, the following instructions will make the installation of your
new amplifier a little easier.

Before starting your installation, remove the negative battery cable before
working on the positive terminal to prevent a short to ground. If a short does
occur, current will continue to flow until the short is opened, the main fuse
blows, or the wire melts (possibly taking out any nearby flammable object,
wire loom, etc. causing a fire or possibly even a tear in the fabric of time and
space). Reconnect the negative terminal after all connections have been made.

MOUNTING YOUR AMPLIFIER

WARNING — AMPLIFIERS GENERA TE HEAT!

You can mount your amplifier in any position, even upside down.
However, airflow must be maintained. Do not install your amplifier
under carpets or behind airtight panels. Let the amplifier breathe.
Without air circulation, your amplifier will reduce its power
output to protect itself.

D7 Professional Reference Amplifiers utilize a forced-air cooling system.
Care must be taken to provide a sufficient flow of air around the amplifier
for the thermal management system to operate at peak efficiency. Air is drawn
into the system along the sides of the amplifier, over the circuit board, through
the bottom heat sink and is exhausted through the vents on the end panels.
Be sure to allow at least 2 inches of space around the amplifier. Never mount
your amplifier where it can get wet. Water damage is not covered by the

18

SYSTEM DIAGRAM 2

Four Channel System with
Subwoofer and Biamplified Front Stage

D7 two channel amplifier

? Source: Front RCA outputs
? Channels 1/2 Highpass to tweeters
? AUX. OUTPUTS to 2nd D7 amplifier

D7 two channel amplifier

? Input: AUX. OUTPUT (full range)

from D7 tweeter amplifier

? Channels 1/2 Bandpass to a pair of midbass drivers

D7 two channel amplifier

? Source: Rear RCA outputs
? Channels 1/2 Highpass to a pair of

rear fill coaxial components

D7 two channel amplifier

? Source: Subwoofer RCA outputs
? Channels 1/2 Lowpass to a pair of

bridged 8 Ohm subwoofers

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2

CONTINUOUS RMS OUTPUT POWER

Note: Full Rated Power is generated at all voltages between 11 and 16VDC.

D7152 D7402

150W x 2 @ 4 Ohm Stereo 400W x 2 @ 4 Ohm Stere

300W x 2 @ 2 Ohm Stereo 800W x 2 @ 2 Ohm Stereo

600W Bridged @ 4 Ohms 1600W Bridged @ 4 Ohms

(minimum impedance) (minimum impedance)

CROSSOVER SPECIFICATIONS

Quantity: 2 (1 for CH 1/2 INPUT, 1 for X-OVER OUT)

Type: Fully Independent and Selectable Highpass,

Lowpass, Bandpass or All-pass

Slope: Third Order 18dB/Octave

Alignment: Butterworth

FUSE RECOMMENDATIONS

D7 Professional Reference Series Amplifiers, by design, require external fusing.
Research has shown that a circuit board mounted fuse can create a drop in
available DC voltage at the input of the power supply resulting in increased
current draw.

We recommend that you install the correct size fuse/holder combination to the
main power cable within 18 inches of the battery. This will protect your vehicle
from fire damage due to a short circuit to the chassis or vehicle body. If a single
amplifier is installed, follow the fuse recommendation below. If installing
multiple amplifiers, add up the total fuse ratings of all installed amplifiers. This
should be used as your main fuse rating.

Amplifier Maximum Fuse Rating

D7152 80
D7402 150

Note: A main fuse must be installed within 18 inches of the positive

battery terminal.

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SYSTEM DIAGRAM 3

Two Channel System
Using a Three-Way Component Set

D7402 two channel amplifier

? Channels 1/2 full range to a three-way component

set with passive crossovers

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1

FEATURES:

TECHNICAL

? Symmetrical Topology, Fully Regulated, Triple-Split-Rail Power Supply
? Isolated Input Section Utilizing “Quasi-Differential”

Instrumentation Amplifier Technology

? Up To 12VRMS Input Signal Voltage Capability (With -12dB Attenuator)
? Third-Order 18dB/Octave Butterworth Crossover Topology
? Wide Bandwidth/Low Distortion Symmetrical Gain Output Stage
? 4 oz. (3 oz. on D7152) Gold Plated Copper Circuit Board
? High Efficiency Forced-Air Cooling System
? Massive 3-Piece Proprietary Heatsink
? Solid Copper High-Current Power Distribution Busbars

CONVENIENCE/APPEARANCE

? Two 3-Way Fully Variable and Independent Electronic Crossovers

in Top-Mount Configuration with Supplied Plexiglass Security Cover
(Separate Independent Crossover for RCA Outputs)

? 24-Karat Gold Plated Solid Brass, Circuit Board Mounted, 4 Gauge

Direct or Ring Terminal Power/Ground Connector Blocks

? 24-Karat Gold Plated Solid Brass, Circuit Board Mounted, 10 Gauge

Direct or Banana Plug Direct Speaker Connectors

? Tinted Plexiglas Circuit Board Viewing Panel
? Solid Billet CNC Machined End Panels with Adjustable

Mounting Flanges

SPECIFICATIONS

Frequency Response: 3 – 50,000 Hz

Signal-to-Noise Ratio: 96dB (D7152), 102dB (D7402)

THD: 0.02%

Channel Separation: 80dB

Input Sensitivity: .5 to 12VRMS

Input Impedance: >40kOhms

Power Supply Operating Range: 10 to 16VDC

DIMENSIONS

D7152 Dimensions D7402 Dimensions

Length: 17 3/4" Length: 24 3/4"

Width: 10 5/8" Width: 10 5/8"

Height: 3" Height: 3"

20

SYSTEM DIAGRAM 4

Two Channel System with
Three Bridged Amplifiers

D7 two channel amplifier

? Channels 1/2 Highpass & Bridged to a

component set using Front Left RCA and
Rear Left RCA from source unit or EQ

D7 two channel amplifier

? Channels 1/2 Highpass & Bridged to a

component set using Front Right RCA and
Rear Right RCA from source unit or EQ

D7 two channel amplifier

? Channels 1/2 Lowpass using Subwoofer

RCA outputs from source unit or EQ to
a pair of bridged 8 Ohm subwoofers

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