4
In a multiple preamplifier system the RCU channel mode allows the user to “page” from
preamplifier to preamplifier. For example, in a 2 preamplifier system (16 channels), the
RCU will show two “pages”; channels 1-8 and channels 9-16. With the cursor on
channel 8, turning the DATA control one click clockwise will page the screen and move
the selected channel to 9.
The bar graph meter at the right edge of each channel section is a 15 segment peak
meter that indicates preamplifier output levels from –35dBu to +25dBu. Unlike the
typical log scale level meter in a tape recorder, the 801R meter represents level in a
mostly linear dB scale. This allows for a meter range of 60dB and useful peak output
level information up to 4dB of the output clip point. When using the peak hold feature
you will notice that the peak hold indicator is a small line for all levels 25dBu,
which is indicated with a square “box”. The clipping level of the 801R is +29dBu. It
should be noted that the bar graph meters in the 801R have an integration time that is
approximately that of the DIN 45406 PPM meter standard. This means that it is possible
to clip the preamplifier on transient program material without the meter indicating a full
level. This is unlike the typical “over” indicator in a digital system which responds
instantaneously to an overload.
Figure 2. Channel Mode
Note: You will notice that the meter ballistics will at first seem sluggish but this
arrangement actually provides more useful information about your peak levels and
headroom status than a typical log scale meter.
