Installation manual

Community S-Series - Operation and Installation Manual - Page 17
Figure 4: Graph Depicting Response of HIGH-PASS / FLAT Switch
(Note: upper line depicts HIGH-PASS; lower line depicts FLAT)
In addition to presenting a more amplifier-friendly load, the HIGH-PASS OUTPUT also
attenuates the low-frequency energy that’s fed to the full-range loudspeaker. This reduces
the demand on the full-range loudspeaker’s woofer, thereby freeing up some additional
power and headroom in the upper part of the bass spectrum. Use of the HIGH-PASS
OUTPUT will typically result in an overall flatter response, but with slightly less total power
available in the mid-bass portion of the audio spectrum.
The results you achieve will be strongly influenced by the relative locations of the full-range
loudspeaker(s) and the subwoofer(s), their position in relation to the walls, floor or ceiling,
as well as the overall room acoustics. For example, if a full-range model is stacked on a
subwoofer, the combined response will be different than if it is flown 15 or 20 feet over the
subwoofer. We encourage you to experiment to obtain the quality of sound that is to your
liking.
IMPORTANT: The corner frequency of the HIGH-PASS FILTER is load dependent (this is
the case with all passive filters). This means that the frequency will alter if the impedance
of the load changes. For example, if two 8 ohm full-range enclosures are connected to the
high-pass output in parallel, the resultant 4 ohm load will change the high-pass corner
frequency to 250 Hz.
C-TIP: For exact control in balancing the relative levels of the subwoofer(s) and the full-
range loudspeaker(s), we recommend that separate amplifier channels be employed to
power each unit individually. Moreover, if an electronic active crossover is used to divide
the signal to the subwoofer(s) and the full-range loudspeaker(s), this will result in bi-
amping the two systems. Bi-amping provides the benefit of reducing the overall power
demand on each amplifier channel while reducing intermodulation distortion.
FLAT position
HIGH-PASS position