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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 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.
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