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Subsonic Filter Switch
The V22 features a specially designed subsonic filter, which effectively blocks potentially destructive
energy in the band below 40 Hz. The filter provides a 12 dB/octave. Skirt below 40 Hz. It is imple-
mented with a two-pole network designed to minimize phase shift down to 40 Hz. We recommend
using this filter in conjunction with some subwoofers and with all high power full range cabinets.
With the filter disabled, the V22 is flat down to 20 Hz, and rolls off at 12dB/Oct below that.
Limiter Switch
With the internal limiters activated, the V22' s gain is continuously adjusted to fit the signal within
the available dynamic range. Occasional clipping is permitted. The limiters will not only help to
protect your system' s horns and tweeters, but will automatically make the best use of the available
dynamic headroom. With the limiters activated, all you need to do is turn up the signal level until
you start to see some clipping. The limiters will make sure that you are getting the maximum clean
power output at all times. Setting the switch to the IN position completely disables both limiters.
Protect LED
In the event of a shorted load or a load which is of too low an impedance for the amplifier to
handle the PROTECT LED will flash alternately on and off at about 3 second intervals. The sound
may come on and off at ½ second intervals. In this case, the fault is in the speakers or the speaker
cables and should be located and remedied. No reset of the V22 is required to restore proper
operation. The PROTECT LED will stay on if the amplifier has overheated. Check the speaker load
impedance and any restrictions to air flow at the air intake or exhaust vents of the amplifier.
Short Circuit Protection
The V22 is fully protected against all possible passive load conditions. It can operate into a dead
short continuously without damage. (However, we don't recommend that you short your V22 "just
for fun." Shorts do create a lot of stress on the output devices). The output stage uses a unique
triple slope VI-limiting scheme, which is sophisticated enough to remain inert during transient cur-
rents in excess of 50 Amperes and phase angles of more than 45 degrees, yet is capable of protect-
ing the output stage from damage due to accidental short circuits and improper loads.
DC Protection
In the unlikely event of the V22's outputs going DC, a thyristor circuit will short the output termi-
nals and divert all potentially harmful currents away from your speakers.
Thermal Protection
In the unlikely event that the V22 overheats, the signal will be sporadically cut off and the PROTECT
LED will stay on. The V22 is designed and tested to operate under "worst case" conditions without
shutting down, so if you experience a thermal shut down you should check for blocked air flow.
Cooling
The fan draws air in from the front and expels hot air through the rear vents. This is compatible
with most installations. Since hot air rises, the heated air forcibly expelled from the back tends
to rise away from the equipment rack. This draws cool air from the floor upwards into the front
of the rack. In some cases where the rear of the rack is obstructed, it may be necessary to install
rack fans to aid cooling. If there are no obstructions, no secondary cooling is required.
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