Owner's Manual
Example-3:
RCA
Input from
Aftermarket
Radio
GND
REM
OUT
Note:
Other
devices such
as
smartphones
or
MP3 players may also be used
as
the
main system source via
the
RCA
input,
which typically produce 1 Vrms
output
or
less. While the bassFREQ's
auto
turn-on circuit
will
detect
very
low
signal levels,
it
may be necessary in some cases
to
adjust gain
for
reasonable listening levels
but
with
reduced
master
volume range.
Top Panel Adjustments
@PARAMETRIC
EQ
I
CCROSSOVER
7'
OQ
cuP
BOOST
WIDTH
FREQ
SUBSONIC
LPF
I
6
MED
so
20
60801
~
(!)
GAIN
00 00
00
Jfil:;
l
(
dB
)
NAR
WIDE
30
(Hz)
80
5
(Hz)
40
Oclippinq Indicator: This yellow
LED
indicates when the
output
signal
is
at
maximum level before
distortion (clipping) occurs.
It
will
be
dimly
lit
just
before the onset
of
clipping, and
full
bright
at
clipping.
Since
the
bassFREQ
can
produce up
to
1
OVrms
output
before clipping,
it
is likely
that
gain
will
need
to
be reduced below the illumination
point
to
match your amplifier(s) maximum
input
capability,
optimize source volume range
or
compensate
for
any equalization applied
after
initial gain setting.
@Gain Adjustment: This adjustment
is
for
matching the
output
signal level
of
the
bassFREQ
with
the
maximum unclipped signal range provided by your source and the maximum input capability
of
your
amplifier(s). Follow proper gain setting procedures
to
ensure optimum source volume range
with
minimum chance
for
clipping
at
any
point
in
the signal chain. Aside from music, a
SO
Hz
-1
OdBfs
sine
wave tone
at
a frequency between the chosen low-pass and subsonic crossover points may also
be
used during the tuning process
to
ensure proper headroom and gain overlap
for
typical music
recording levels. Readjustment may be necessary
after
any changes
to
the parametric
EQ.
@Parametric
EO
: This section provides
full
adjustment
for
all parameters
of
a single
EQ
band, including
boost,
width
and frequency. Unlike traditional
bass
boost, a parametric
EQ
provides the tuning
flexibility required
for
differences between vehicles, subwoofers and enclosures.
8Boost: Provides adjustment
for
the amount
of
boost
at
the center frequency
(Fe)
set
for
the parametric
EQ
band,
up
to
+12dB.
If
gain has already been adjusted, adding
boost may cause the
output
to
clip and require reduction
of
gain
to
achieve final desired unclipped
output
level.
-
C0
,::,
......
...,
"'
0
0
C0
Fe
• - - - -If\- - • - - I
3dB
'
-
--
- -~---,.,_.....~
I I I
0Width: Also known
as
Q,
this adjustment sets the
bandwidth
(BW)
of
the parametric
EQ
band. A wide
setting
will
include more adjacent frequencies
for
a
broad boost, while a narrow setting
will
only boost
frequencies close
to
the chosen center frequency
(Fe)
.
The range
of
Q adjustment
is
1.5
(wide)
to
5 (narrow).
To
calculate the range
of
frequencies boosted between the
-3dB points
of
the
EQ
band, use the formula
BW
= Fc/Q.
F,
F
2
Freq (Hz)
¢Example:
If
freqency
is
set
at
Fe=
SOHz,
and
width
is
set
at
narrow
(Q=S),
then the boosted
bandwidth
will
be
SOHz/5
= 1
OHz,
meaning the -3dB points
will
be
at
45Hz and
SSHz.
0Frequency
: This adjustment
is
for
setting the center frequency
(Fe)
of
the parametric
EQ
band
between 30Hz and 80Hz.
Note
: The
PEQ
stage comes before the low-pass and subsonic
filter
stages
in
the internal signal chain
so
that
any overlap from the
PEQ
will
still be
filtered
at
the chosen crossover points.
4