Emotiva USP-1 - Manual (Page 15)

15
Low Pass/High Pass Outputs
Recommended for users with speakers that do not have the capability to produce low bass tones (below
80Hz). Bookshelf speakers, smaller ‘satellite’, and home theater style speakers may be incapable of
producing lower bass tones, either by design or simple size limitations.
To optimize the performance of the speakers, and to maximize the power output of the connected
amplifier, use the High Pass outputs for your left and right speakers and adjust the High Pass filter
frequency control (4) to select the cut-off frequency. All frequencies below this will be attenuated.
Use either the Balanced (2) or RCA (3) Low Pass outputs to connect to a powered subwoofer, and using
the Low Pass filter frequency control (1) select the cut-off frequency. All frequencies above this will be
attenuated.
It is recommended that you start at 80Hz for both, and adjust until you are satisfied with the
result. Again, there is no right or wrong, only what sounds pleasing to you.
Choosing A Low Pass Filter
When connecting a powered subwoofer in a traditional “2.1” configuration, the built in amplifier of the
powered subwoofer commonly has a variable on-board low pass filter. It is up to you which filter you
choose (either the one built into the USP-1 or the one on the powered subwoofer), but USE ONLY ONE
of the low pass filters. Using two low pass filters at once could result in phasing problems.
To use the Low Pass filter on the USP-1, adjust the Low Pass filter on the connected subwoofer by
selecting the highest possible frequency. Then use the USP-1 Low Pass filter to select a frequency
lower than the highest frequency on the subwoofer.
To use the Low Pass filter on the connected subwoofer, adjust the Low Pass filter on the USP-1 by
selecting the highest possible frequency. Then use the subwoofer Low Pass filter to select a frequency
lower than the highest frequency on the USP-1.
If your connected sub has an LFE connection, and you wish to use the USP-1 Low Pass filter,
connect the USP-1 sub output to the LFE input. This bypasses the subwoofer’s internal
crossover.