Community VLF Series – Operation Manual - Page 14
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 built-in
HIGH-PASS FILTER on the VLF212P
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.
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.
