Testing the Subwoofer NON-THX | MK Sound MX-150THX, V-125THX

THX subwoofers	page 10

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.