MartinLogan Depth I, User Manual

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This setup is recommended if your subwoofer will be used
in a 2-channel only system.
Signal Connection (see figure 11):
1 Connect the left out/right out from your preamplifier to
the Left In/Right In of the subwoofer. Use quality RCA
interconnects.
2 Connect the Left Out/Right Out of your subwoofer to
the left in/right in of your amplifier. Use quality RCA
interconnects.
Recommended Control Settings:
1 Set the controls as recommended on page 9.
2. The High Pass Filter: Out switch should be set, at the
user’s discretion, to the option with the best sound-
ing result. As a general rule, if your main loudspeakers
are bookshelf speakers, set the High Pass Filter: Out to
70Hz. Likewise, 40Hz for floorstanding loudspeakers.
Use ‘None’, if you want to pass an unaltered signal.
3 At this time the Low Pass Filter should be set to
approximately 70% of your main loudspeakers lowest
frequency response—make note of this number.
If the High Pass Filter: Out is set to ‘None’, the Low
Pass Filter should remain at approximately 70% of your
loudspeakers lowest frequency response.
If the High Pass Filter: Out is set to 40Hz, the Low Pass
Filter should be set to 35Hz or 70%, whichever is greater.
If the High Pass Filter: Out is set to ‘70Hz’, the Low Pass
Filter should be set to 55Hz or 70%, whichever is greater.
Why the Filters Are Not Equal
You may have noticed the recommended setting proce-
dure does not advise setting the Low Pass Filter and High
Pass Filter: Out to the same frequency. Between 20Hz
and 100Hz, as the subwoofers output decreases, the
loudspeakers output increases. For a seamless crossover
of these two slopes, the summation of their two values, at
any given frequency, should add to maintain a level out-
put. By correctly setting your High Pass Out and Low Pass
filters, this result can easily be achieved (see figure 12).
Figure 11 . Signal connection for 2-channel mode with 2-channel output.
2-Channel Mode With 2-Channel Output
Figure 12 .
Controls and Connections 13