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page 10
THX subwoofers
To connect the subwoofer, run shielded RCA - RCA interconnect cables from the outputs on your
component to the "INPUT" jacks found on the subwoofer's backplate. See Figure 5 on page 9.
If your processor has a single subwoofer output, do not use a Y-connector to connect it to both the
Left and Right input terminals of the subwoofer. The subwoofer combines both channels to mono in
its amplifier input stage.
If you are using two subwoofers, it is not necessary to use both inputs on each subwoofer. Simply
connect the interconnect cable to one "FROM PREAMP jack only. Run the Left channel interconnect
cable to the Left subwoofer and the Right interconnect cable to the Right subwoofer. See Figure 4.
WIRING WITH THE M&K LP-1S, HP-80, OR VF-80 HIGH-PASS FILTERS (NON-THX
)
The M&K LP-1S, HP-80, and VF-80 High-Pass Filters can improve any system that allows its
preamp and power amp stages to be separated, by filtering the bass fed to the main amp and Satellite
speakers.
These filters will give your system greater dynamic range, lower distortion, and an increased
maximum output. To use these filters with an integrated amp or receiver, the amp or receiver MUST
have back panel RCA jacks labelled PREAMP/MAIN OUTPUT and POWER AMP/MAIN INPUT.
There may be a switch or jumper connections between them, which you will have to remove. If you
have any questions about your components, contact your dealer or M&K.
For non-THX systems, your subwoofer is optimized for use with the HP-80 High-Pass Filter.
We strongly recommend that you use this filter with any component system that allows for its use.
When you use this subwoofer with an HP-80 and M&K Satellites, the combination forms a 4th order
Linkwitz-Riley crossover between satellite and subwoofer. The linear phase of this crossover means
uncompromised performance with great flexibility in system setup, without requiring elaborate
calibrations or adjustments.
Do not use either of these filters with a THX controller. The THX controller has the appropriate filters
in its built-in crossover circuitry. Also, do not use a SUBWOOFER OUTPUT jack on your amp or
processor to feed any of these filters.
To connect one of these filters, run one set of shielded RCA - RCA interconnect cables from the
receiver, amp or preamp's MAIN OUTPUT to the input jacks on the LP-1S the HP/VF-80. Run another
set of interconnects from the high frequency output jacks on the filter to receiver or amp's POWER
AMP inputs. Last, run interconnects from the subwoofer output jacks to the subwoofer's "FROM
PREAMP" jacks. See the instructions enclosed with your filter for wiring diagrams.
To use these filters, make certain that the "BASS LEVEL" switch is set to "VARIABLE" and that the
"LOW PASS FILTER" switch is set to "24 dB/OCTAVE"
TESTING THE SUBWOOFER (NON-THX)
Once all of the interconnect cables are in place, you are ready to plug in your subwoofer. Make
sure the "LOW PASS FILTER" switch is set to the "24 dB/OCTAVE" position and the "BASS LEVEL"
control to set to "VARIABLE". Make sure the "SUBWOOFER PHASE" switch is set to the "+" position.
Then plug the AC cord in. You should see the red LED on the back panel of the subwoofer illuminate.
When your system wiring is complete and the subwoofer is plugged into the wall, leave it plugged
in, even when the system is turned off. The normal mode of operation for the subwoofer is to remain
plugged in 24 hours a day. Among other things, this means that you don't have to walk over to the
subwoofer to turn it on every time you want to use the system.