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8 | JL Audio - RD900/5 Owners Manual
INPUT TYPE
Each pair of stereo output channels includes an
Input Ty pe” switch to configure how the input
signals are fed to the outputs.
Selecting “Stereo” will send signals from
both left and right inputs to their respective
outputs.
* Selecting “Mono” will send the signal from
the left input (only) to both outputs, without
need to use Y-adaptors. This is useful when
sending a single mono signal to both outputs
of a channel pair or to a bridged channel pair.
CHANNELS 1 & 2
HP Filter Freq. (Hz) HP Filter Freq. (Hz)
Input Type Input Sensitivity Input Sensitivity
Stereo
|
Mono
Input Type
Stereo
|
Mono
CHANNELS 3 & 4
Clipping
Clipping
INPUT SENSITIVITY CONTROLS
The control labeled “Input Sensitivity” and
Clipping” LED located in each channel section
are used to match the source units output voltage
to the input stage of each pair of amplifier
channels for maximum clean output. Rotating the
control clockwise will result in higher sensitivity
(louder for a given input voltage). Rotating the
control counter-clockwise will result in lower
sensitivity (quieter for a given input voltage.)
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page 14)
in this manual. After using this procedure, you
can then adjust any or all “Input Sensitivity
levels downward if this is required to achieve the
desired system balance.
Do not increase any “Input Sensitivity”
setting for any channel(s) of any amplifier in the
system beyond the maximum level established
during the procedure outlined in Appendix
A (page 14). Doing so will result in audible
distortion and possible speaker damage.
Left
or
Mono
Right
Only
+12 VDC Ground Remote
Input Mode
2 Ch.
|
4 Ch.
|
6 Ch.
Input Voltage
Low
|
High
Rem.
|
Oset
|
Signal
CH. 1
CH. 2
CH. 3
CH. 4
SUB
SUB
INPUT SECTION
Turn On Mode
CH. 3
(
L
)
CH. 4
(
R
)
CH. 1
(
L
)
CHANNELS 1 & 2
CH. 2
(
R
)
HP Filter Freq. (Hz) HP Filter Freq. (Hz)
Input Type
Input Sensitivity Input Sensitivity
Stereo
|
Mono
Input Type
Stereo
|
Mono
5 Channel System Amplifier
CHANNELS 3 & 4
Clipping
LP Filter Freq. (Hz)
Input Sensitivity
Clipping
Clipping
SUBWOOFER CHANNEL
FILTER CONTROLS
Most speakers are not designed to reproduce
the full range of frequencies audible by the human
ear. For this reason, most speaker systems are
comprised of multiple speakers, each dedicated
to reproducing a specific frequency range. Filters
are used to select which frequency range is sent
to each section of a speaker system. The division
of frequency ranges to different speakers can be
done with passive filters (coils and/or capacitors
between the amplifier outputs and the speakers),
which are acceptable and commonly used
for filtering between mid-range speakers and
tweeters. Filtering between subwoofer systems
and satellite speaker systems is best done with
active filters, which cut off frequency content at
the input to the amplifier. Active filters are more
stable than passive filters and do not introduce
extraneous resistance, which can degrade
subwoofer performance.
The active filter built into each channel
section of the RD900/5 can be used to eliminate
potentially harmful and/or undesired frequencies
from making their way through the amplifier
sections to the speaker(s). This serves to improve
tonal balance and to avoid distortion and possible
speaker failure. Correct use of these filters can
substantially increase the longevity and fidelity of
your audio system.
1) HP Filter Operation: The RD900/5 employs
12dB per octave high-pass active filters for each
pair of main channels (one high-pass filter for
each channel) with fully variable frequency
selection between 50 Hz and 500 Hz via the
HP Filter Freq. (Hz)” control knob (80 Hz is a
good starting point for tuning most systems.)
8


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