Owner's Manual

Controls and Functions (A600.1D):
The Turn-On Mode and Level control
for the A600.1D operate exactly like the
controls on the A150.4D. The Power and
Protect LED functions are also the same
as the 150.4D. Because the A600.1D is a
single channel amplier designed to drive
low frequency speakers or subwoofers, the
crossover controls are somewhat different
and are explained below.
High Pass 5Hz-40Hz: Adjusts the high pass
lter frequency to any frequency between
5Hz and 40Hz. Low frequencies below this
selection will be removed. For subwoofers
in vented boxes, set this control about a
half an octave below the frequency at
which the enclosure is tuned to prevent
too much excursion from damaging the
speaker. This is also useful for innite bafe
subwoofers. If your system doesn’t require
a high pass lter for the subwoofer, set this
control to its minimum setting (5Hz).
Low Pass 50Hz-500Hz: Adjusts the low pass
lter frequency to any frequency between
50Hz and 500Hz. High frequencies above
this selection will be removed.
Phase 0°-180°: Adjusts the phase of the
output at the crossover frequency be-
tween 0 degrees and 180 degrees. Use
this control to match the phase of the
subwoofer with that of the front speakers
to help blend the sound of the subwoofer
into the sound of the front speakers.
45Hz 0dB-15dB: Adjusts the amount of
45Hz in the output between 0dB and
15dB. Adjust this as you wish but be careful
because too much bass boost can cause
distortion at high output when the am-
plier runs out of available power at high
volume. Each 3dB of boost requires double
the power of the unboosted frequencies.
3dB requires twice the power. 6dB requires
four times the power. 9dB requires eight
times the power. 12dB requires sixteen
times the power and 15dB requires 32
times the power sent to the unboosted
frequencies.
Remote Level Control (optional): This
control, if installed, allows the level of the
output of this amplier to be controlled
from the front of the car. The RLC will vary
the output level of the amplier between
off (fully counter-clockwise) and the level
control setting selected with the level con-
trol on the amplier (above).
Using These Ampliers With a DSP: When
using these ampliers with a DSP, you
can (and should) defeat the A150.4D’s
on-board crossovers by selecting “None”
with the Filter Type switch if the lter will be
implemented in the DSP. When using the
A600.1D with a DSP, adjust the Low Pass
lter to its highest frequency (500Hz) and
the High Pass lter to its lowest frequency
(5Hz) if you will implement the high pass
lter in the DSP. You can also use the high
pass lter in the amplier to protect your
subwoofer from over excursion if your DSP
doesn’t include a high pass lter for the
subwoofer.
When Driving Tweeters Separately in an
Active System: Set the high pass lter
frequency about an octave above the
tweeter’s free air resonance (Fs). An oc-
tave is a doubling or halving of frequency.
So, if your tweeter’s Fs is 1.5kHz, set the
crossover at 3kHz.
Use a protection device to save your
tweeters in case of a mishap. A capacitor
and a resistor work well. Choose the value
of the capacitor to provide a -3dB point
about an octave below your crossover.
The values below are suitable for all Au-
diofrog tweeters.
Signal
Turn-On Mode
Offset Rem
50uF
Tweeter +