1.
CHANNEL BYPASS SWITCH.
This switch provides a passive bypass of each chan-
nel of the FPL 44. When pressed in, it directly connects the positive, negative and signal
ground inputs to the positive, negative and signal ground outputs of the channel. It is pro-
vided to allow easy A/B comparison of limiter activity. It also serves to pass the audio sig-
nal around the active circuitry of the limiter in the event of power failure.
2. BYPASS INDICATOR.
This red LED illuminates to advise the operator of a bypass
condition, i.e., BYPASS switch pressed in.
3. LIMIT THRESHOLD CONTROL & INDICATOR.
The calibrations (in dBu,
0 dBu = 0.776 Vrms) around this knob indicate the point at which the output limits. All lev-
els higher than this setting are reduced to this preset amplitude. The indicator illuminates
when the preset threshold is exceeded.
4. AUTO-SLAVE SWITCH.
In the INDEPENDENT position (“down” in the vertical
orientation, “right” when horizontally mounted) each limiter channel operates separately.
In the AUTO-SLAVE position (“up” in the vertical orientation, “left” in the horizontal),
each channel limits the same amount that any other channel in the slave mode does. If only
one channel of the possible four is set to this mode, it operates independently. If two or
more are set to AUTO-SLAVE, all slaved channels will attenuate the same amount when
any one exceeds its THRESHOLD.
5. POWER INDICATOR.
This yellow LED illuminates when an appropriate power sup
ply is connected to the FPL 44 and is, itself, connected to an appropriate power source.
For the definition of “appropriate power supply,” please refer to the front page of this man-
ual. It doesn’t really make a lot of sense to beat this issue to death alter having done so
twice on the first page.
FRONT PANEL DESCRIPTION