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INSTALLATION STEP 6
k
CROSSOVER ADJUSTMENTS
The
REFERENCE644s
and REFERENCE414s amplifiers incorporate an
on-
board staggered electronic crossover. They also have RCA outputs to drive an
external amplifier. No external electronic crossover is necessary. The high and
low pass portions of the crossover can be set independently of one another.
In most car audio installations, there is a tendency for a “midbass boom.”
Because of their interior dimensions, most cars will resonate or ring at these
midbass frequencies. If we design the system so there is less musical
information in this region, the final response is very smooth and natural
sounding. The high pass filter is variable from 60 to 240 Hz at 12
dB/octave,
while the low pass filter is variable from 30 to 120 Hz at 24
dB/octave.
For initial crossover setup, try setting the low pass filter to approximately 60 Hz,
and the high pass filter(s) to approximately 100 Hz. Change the
cro~swer
points to accommodate a good mixture of frequency response, power handling.
and personal preference.
full
range
is detived from ~
When the RCA
sianal
outout
is
~
summed from Channels I,
2;
j
the
REFERENCE644s
also
!
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AIRBASSTM
ACCESSORY
OPT/ON
Soundstream’s
newA/RBASSTY
feature can be added to the REFERENCE6445
&
REFERENCE414s
amplifiers. This feature allows wireless RF remote conlrol
level adjustment of the amplifier, while the low pass filter on the amplifier’s
internal crossover is engaged.
(AIRBASS
TM
does not control the level of the
RCA signal outputs.)
111
~
NOTE: The
A/RBASSTM
accessory
;s
intended to be used only while
the REFERENCE amplifiers are
diving
a
subwoofer(
When the
AIRBASSTH
accessory is added to a
REFERENCE414.s
and
REFERENCE644q it controls the level of any channel receiving
informabon from the low pass filter in the amplifier. The Coherent
StereoTM
/
Mixed Mono
/
Bridged Mono switches
still
function as
nomlal.
Installing AiRBASS
TM
involves removing the bottom plate of the amplifier.
adding the
AIRBASSTM
circuit board, and flipping a switch. The switch is
labeled on the amplifier’s main circuit board. DO NOT set the
AIRBASSTM
switch to the “IN” position unless the
AIRBASSTM
module has been added. DO
NOT move the
A/RBASSTM
switch while the amplifier is “ON”. Doing so
may damage your speakers. (Please refer to the
AIRBASS”*
owner’s
I
installation manual for more details.)
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