7
Adjustments and Controls Setting Gain Control
The gain control is provided for level matching purposes. The control does not give
the amplifier any more power by turning it up. Its purpose is to adjust the sensitivity of
the amplifier in relation to the output level provided by the source.
Start with the amp gain set to minimum by turning the control counterclockwise. Turn
the source level up until distortion is barely audible. Then turn it down slightly. This will
typically be about 85% to 95% of full volume. Raise the amplifier gain until distortion is
just audible. The gain is now set correctly. Check the level with cd/tape and tuner to make
sure the adjustment is correct for all sources.
Setting KICKEQ™ Controls
The Bass and Treble controls on your Impulse Amplifier are provided to help tune your
system for ideal sound quality. After the system is installed and the vehicle is put back
together, do the listening test with music that is typical of the type you normally listen to.
Initially set the tone controls on the source unit to flat and turn the KICKEQ™ controls
fully counter-clockwise. Depending on your personal taste and the speakers used in the
system, you may want to increase the high or low frequencies by turning the KICKEQ™
controls clockwise. Remember that once the vehicle is in motion there will be apparent
loss of bass due to the masking effect of road noise. Do not attempt to make
adjustments while the vehicle is in motion. It is safer to pull off the road to
make changes.
Never change the crossover settings while the amplifier is on. A loud pop
will result which could destroy speakers or cause hearing loss.
SPECIFICATION
Model IX704 IX404 IX254
RMS Power (Watts/Channel) @12.5V, 4Ω Stereo 70 x 4 40 x 4 25 x 4
0.085% THD, All Channels Driven
RMS Power (Watts/Channel) @12.5V, 2Ω Stereo 105 x 4 60 x 4 35 x 4
0.2% THD, All Channels Driven
RMS Power (Watts/Channel) @12.5V, 210 x 2 120 x 2 65 x 2
4Ω Bridged Mono, 0.2% THD
Dynamic Power (Watts/Channel) @14.4V, 100 x 4 55 x 4 30 x 4
4Ω Stereo, 0.085% THD, All Channels Driven
Dynamic Power (Watts/Channel) @14.4V, 140 x 4 80 x 4 42 x 4
2Ω Stereo, 0.2% THD, All Channels Driven
Dynamic Power (Watts/Channel) @14.4V, 280 x 2 160 x 2 85 x 2
4Ω Bridged Mono, 0.2% THD
Dimensions (In., MM) 13.8, 350 11.4, 289 7.8, 198
(All Models 2.5”H x 9.5”W x ...”L,
63mmH x 241mmW x ...mmL)
Frequency Response 20Hz-20kHz ±0.5dB
Input Sensitivity High Level 1V-10V, Low Level 150mV-3.0V
Signal-to-noise Ratio >95dB, a-weighted, re: rated power
Active Electronic Crossover 18dB/ octave, selectable @70Hz or 110Hz;
KICKEQ™ Bass Boost Variable to +18dB, centered @ 40Hz
KICKEQ™ Treble Boost Variable to +12dB, centered @ 18kHz
