Diamond D400.1 - Manual (Page 6)

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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 amplifiers
“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 Diamond amplifier to your source unit. This is NOT a volume
control. The range is between 150mV and 5V.
High Level Inputs (D300.2, D300.4, D400.1) - This plug (included) is for use when the source unit does not have an RCA output.
Although this is a popular method of connecting a factory car stereo, some systems may require additional adaptors. The far left
side of the plug is the LEFT channel; the far right side is for the Right channel. The wire in the middle is for chassis ground ONLY
if the system is experiencing excessive noise problems.
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. In the OFF position, the crossover adjustment knob has no effect. The D600.1 and D1000.1
are 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 (D400.1, D600.1, D1000.1) - This control allows you to remove the unwanted sub-sonic frequencies below
the tuning frequency of a ported enclosure. This helps to protect the woofer from over excursion. (D400.1 Switchable (OFF/ON))
(D600.1, D1000.1, Variable From 16-60Hz)
Phase Adjustment (D400.1, D600.1, D1000.1) - This control allows you to adjust the "phase" so as to align the subwoofer in "time"
to the mids and tweeters. This is selectable for 0 or 180 degrees. This is EXTREMELY useful to get the best and MOST bass out
of your system.
Bass Boost- This control adds 0 to +12dB of boost at the frequency that the Bass Boost Frequency is set to. Be cautious when
adding boost to some subwoofer systems as they may not be able to handle the additional low frequency boost. In the 0dB position,
no bass boost is added.
Bass Boost Frequency (D600.1, D1000.1) - This is to adjust the specific frequency that your Bass Boost Control will boost (30Hz
-125Hz).
Master/Slave RCA Input/Output (D600.1, D1000.1) - This RCA Input/Output is used in conjunction with the Master/Slave switch.
This allows one remote level control to control multiple amplifiers (amplifiers must be the same model). 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 (D400.1, D600.1, D1000.1) - 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 (Except D1000.1) - Standard automotive type ATC/ATO fuses are used on Diamond Series Amplifiers. Always replace
with the correct fuse size. Never insert fuses of higher values. Doing so will void the warranty of your Diamond 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 D600.1 and D1000.1, are the only amplifiers in the
series capable of driving a load as low as 1 Ohm.
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