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shielded cable, to the 6505® SUB's thru/HPF XLR Output, with the THRU/HPF switch (4) in the HPF (High Pass Filter) mode, where
the switch is IN. Connect the 1/4" end to the guitar head/combo effects loop return.
When the effects loop is activated, the signal from the guitar amp will now pass thru the SUB's built-in crossover, and the lows below
120 Hz will now be reproduced by the 6505® SUB, and the guitar amp head/combo unit will now have the low frequency burden
removed, allowing it to play louder and cleaner if so desired. The signal returned to the guitar amp head/combo will have had the
lower frequencies below approx 120 Hz filtered out of the guitar signal.
If you don't want the low frequencies filtered out of the original guitar amp head/combo, then put the THRU/HPF switch (4) on the
6505® SUB in the "THRU" mode, or with the switch button OUT. The original guitar amp is no longer crossed-over, but is getting the
original full-range signal.
This setting reverts the system to an "add-on mode" operation, but with line level signals instead of speaker level signals.
3. Guitar Simulator Use
The 6505® SUB can also be used in conjunction with a Guitar Simulator Amp or rack box.
It can be used either in add-on mode, or crossed-over mode, as described above.
DO NOT ATTEMPT TO RUN THE GUITAR SIGNAL STRAIGHT IN TO THE 6505® SUB INPUTS, as the unit does not have the
proper input impedance or enough low noise gain to operate with a guitar signal direct in.
General Precautions
Do not connect cables to the jacks while the unit is ON and the Level is turned up! Sometimes, with difficult interference problems,
it will be helpful to lift the shield ground on a balanced cable at the 6505® SUB end only by using the ground lift switch (3). Check
any input changes carefully, always turning the level control down before plugging and unplugging cables.
Use of high quality, premium cables is recommended for the 6505® SUB, as these usually have better shielding and materials and will
provide greater long-term reliability. It is usually a good idea to leave some slack at the input to the 6505® SUB and also to tape the
cables down or run them under a cable guard to avoid anyone tripping over them or pulling them out of the input jacks.
Level Control Adjustment
The 6505® SUB is equipped with a level control to facilitate use in many different applications. With the level control adjusted fully
clockwise, gain is at maximum and the input sensitivity is 0.375 V RMS for full-rated output. When driving the 6505® SUB from a
guitar head / combo unit, it may be advantageous to reduce the input sensitivity by turning the level control to the halfway point.
The 6505® SUB will now more closely match the sensitivity of a typical power amp.
If the signal source indicates clipping of its output signals, then all of the 6505® SUB power capability is not being utilized cleanly.
Clipping the signal before it gets to the 6505® SUB is not optimal. Reduce the source output level and turn up the level control on the
6505® SUB.
The amplifiers in the 6505® SUB are equipped with DDT™ and an LED indicator to show that DDT™ has engaged. If the sound seems
heavily compressed, check this indicator; if it is blinking RED more than half the time, then the drive level from the signal source (or
the level control on the 6505® SUB) needs to be reduced. When first turning on the sound system, switch on all upstream electronics
first, then the 6505® SUB with its level control fully counterclockwise (all the way down). Begin checking levels with the signal source
output level controls all the way down, and bring them up slowly with the 6505® SUB level control set to the desired setting (halfway
up recommended to start).
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