BBE 822 - Page 6

Disco/Club
Figure 7 shows the BBE 822 in a disco club application. Usually, the same rules mentioned in live concert systems apply
but on a smaller scale. The ideal place to insert the BBE 822 is between the “main program buss out” and the master
volume control. Not all disco club mixers have this facility, so the next best place is at the power amplifier. The output of the
mixer feeds the BBE 822’s input and the output of the BBE'“ feeds the power amplifier. The BBE 822 unit is set to
accommodate the loudest levels used.
The Controls
Operation of the BBE 822 is quite simple due to the sophisticated circuitry within the unit. The purpose of each control on the
BBE 822 is outlined below.
Lo Contour Control
Definition Controi
Hi Contour
LED stack
Function Switch
Power Switch
AC Power Cord
Fuse
Lo-Z Balanced
Output
Hl-Z Unbalanced/
Balanced Output
Lo-Z Balanced Input
Hl-Z Unbalanced/
Balanced Input
FRONT PANEL
Each channel has a lo contour control that regulates the amount of phase compensated bass
equalization. This adjustment ranges from -lOdBu (fully counterclockwise) to +10dBu (fully
clockwise) at 50Hz relative to the input. The middle position is flat or unity gain.
Each channel has a definition control that regulates the amount of amplitude compensation as
indicated by the hi contour LED stack. Set to minimum (fully counterclockwise) yields a flat
frequency response with phase compensation only. Turning clockwise increases the amplitude of
the hi frequency band relative to the mid band amplitude providing an improved spectral balance
between the high and mid bands.
Each channel is equipped with a set of LED indicators that instantly show the relative amount of
high band compensation as compared to the mid band.
1) RED LED (marked “-”): compression mode. The amplitude of the high band is too high as
compared to the mid band and compression is being applied to compensate.
2) AMBER LED (marked “0”): Flat mode. No amplitude compensation is needed. The program
spectral content is correct.
3) GREEN LED (marked “ + ”): Expansion mode. The amplitude of the high band is too low as
compared to the mid band and is being expanded to compensate.
4) CLIP LED: This LED indicates that the output of the BBE 822 has reached the maximum level
of +24dBu.
Each channel is equipped with a function push button switch which allows for a quick comparison
of processed with unprocessed sound. When the switch is depressed, the green “In” LED lights.
When the switch is out, the amber “Out” LED lights. In the function “Out” mode, the audio signal
goes through a single piece of wire and a set of sealed relay contacts — no noisy switches or
pots.
This switch controls primary power to the BBE 822.
REAR PANEL
Plugs into AC power recepticle.
Turn cap on fuse holder counterclockwise to remove fuse. (Note: replace with 250Vac, V 2 A type
fuse.)
Each channel is equipped with a 3-pin male XLR type connector that is a low impedance,
balanced line level output. Normally connected to a power amp input, it is capable of delivering
-K24dBu into 600 ohms.
Each channel is equipped with a high impedance, tip-ring-sleeve Va phone jack output that may
be used for either balanced or unbalanced applications. This line level output is capable of
delivering -i-24dBu into 600 ohms.
Each channel is equipped with a 3-pin female XLR type connector that accepts a low imped¬
ance, balanced line level input with an average level of -i-4dBu normally from a mixer output.
(Note: +24dBu is the maximum input before clipping.)
Each channel is equipped with a high impedance, tip-ring-sleeve Va phone jack input that may
be used for either balanced or unbalanced applications. This line level input accepts +4dBu
average line levels normally from a mixer output. (Note: +24dBu is the maximum input before
clipping.)
Set-Up
The BBE 822 is connected into the audio chain in series with the signal path — the same way a graphic equalizer or limiter is
connected. The output of the mixer, pre-amp or tape recorder feeds the input of the BBE 822. The input level should fall within
the nominal range as outlined in the specifications.
Setting-up and using the BBE 822 as an echo send device like a digital reverb is not recommended. The processing effect
is not fully realized when the output of the BBE 822 is summed with the original source audio.