Biamp 801 User Manual

TM

801

Mic/Line Mixer

Operation Manual

Biamp Systems, 10074 S.W. Arctic Drive, Beaverton, Oregon 97005 U.S.A. [phone] www.biamp.com

an affiliate of Rauland Borg Corp.

blank

print update

June 17, 2002

TABLE OF CONTENTS

Front Panel

Rear Panel

Options

Applications

Specifications & Block Diagram

Warranty

pg. 2

pg. 3

pgs. 4 & 5

pgs. 6 & 7

pg. 8

801

INTRODUCTION

The 801 is a single rack-space mixer, with eight mic/line inputs and one
auxiliary line input. Each mic/line channel uses a differentially balanced,
discrete transistor preamplifier for low noise and low distortion performance.
Special features, including a limiter and remote level control, make the 801
extremely versatile. The 801 mixer is dependable, easy to install, simple to
operate, and carries a five-year warranty.

801 features include:

♦ eight differential balanced mic/line inputs & one aux line input

♦ discrete transistor mic/line preamps for low noise & distortion

♦ optional mic/line input isolation transformers (user installed)

♦ +24 volt phantom power selectable on each mic/line input

♦ optional +48 volt phantom power supply (user installed)

♦ aux input switch selectable for balanced or stereo summing

♦ aux input 'auto-ducking' switch selectable on channels 1~8

♦ front panel trim and rear panel pad switch on each channel

♦ +10dB 'peak' LED indicator on each channel for easy set-up

♦ high-pass 'rumble' filter switch selectable on each channel

♦ mic/line & aux inputs on plug-in barrier strip connectors

♦ 1/4" patch insert jack on each channel and at main output

♦ balanced main output on plug-in barrier strip connector

♦ main output limiter with threshold control and LED indicator

♦ main out Bass & Treble control with rear panel bypass switch

♦ -20dB signal present & power LED indicators at main output

♦ channel 1 / priority override via rear panel switch terminals

♦ optional remote control of main out via external level control

♦ optional main output isolation transformer (user installed)

♦ stack in & slave switch to add inputs by linking multiple units

♦ DC Out jack for powering certain other BIAMP products

♦ covered by Biamp Systems' five-year warranty

marked and UL / C-UL listed power source

♦

1

FRONT PANEL

trim

+10

trim

1

+10

trim trim trim trim trim trim

2

34 567 8

+10 +10 +10 +10

+10

+10 Indicator (Channels 1~8 & Aux): These red LEDs will light
whenever channel signal levels reach +10dB (8dB below clipping).
Use this feature to aid in adjusting the Trim controls (see below).

Trim (Channels 1~8): These screw-driver adjustable controls set
the channel gain (0~60dB) to compensate for different input signal
levels. For best performance, adjust these controls so the channel
+10 indicators flash only on occasional peaks. If input signal
exceeds the normal operating range of the Trim control, assign the
rear panel Pad switch (see DIP switches on next page).

Level (Channels 1~8 & Aux): These controls adjust the amount of
signal sent from the individual input channels to the mixer output
section. Optimum Level settings are near the 12 o'clock position
(unity gain).

Bass: This control provides low-frequency tonal adjustment
(±10dB @ 100Hz) for signals at Main Patch & Main Output.

Treble: This control provides high-frequency tonal adjustment
(±10dB @ 10kHz) for signals at Main Patch & Main Output.

threshold

aux

+10

+10

treblebass

master

limit-20 on

801

-20 Indicator: This red LED will light whenever signal levels reach

-20dB (signal present) at Main Output.

Master: This control adjusts the level of overall signal sent to
Main Output. Optimum Master settings are near the 12 o’clock
position (unity gain) or below.

Threshold: A limiter is provided at Main Output to help eliminate
unwanted peaks in signal level. This screw-driver adjustable
control sets the level at which the limiter will be activated. For
most applications, set Threshold so the limiter is activated only by
occasional peaks. Counter-clockwise adjustment lowers
Threshold, increasing the amount of limiting. Clockwise
adjustment raises Threshold, decreasing the amount of limiting.
Threshold is factory set fully clockwise, effectively removing the
limiter from operation.

Limit: This red LED will light whenever signal levels exceed the
threshold, thereby activating the limiter.

On Indicator: When the power transformer is plugged in, and AC
power is applied to the 801, the red On indicator remains lit.

2

REAR PANEL

27V

50/60 Hz

15 watts

class 2 wiring

DC out

±12VDC

BIAMP SYSTEMS

main out

~

an affiliate of Rauland Borg Corp.

stack in

MADE IN U.S.A.

remote

vc

main patch

ON

slave

override

tone out

pad

sum

priority

remote

patch

patch

input

R

L

ON

pad

aux

priority

phantom

hp filter

AC Power Cord: The power transformer provides 27 Volts AC to
the mixer, and is detachable via a 5-pin DIN connector. The mixer
has two internal ‘self-resetting’ fuses (there are no user
serviceable parts inside the unit). If the internal fuses blow, they
will attempt to re-set after a short period. However, this may be an
indication that the mixer requires service.

DC Out: This 6-pin RJ11 modular jack supplies ±12 Volts DC
(100mA max.) for powering certain other BIAMP products, or other
external devices (see product manuals for power considerations).
Manual triggering of Channel 1 Override

is also provided at the DC
Out jack, by shorting pins 3 & 6 together using an external contact­closure (see Options on pg. 4). Channel 1 Override can be
triggered automatically, by signal present in Channel 1, as well
(see Master DIP switches below).

Main Output: This plug-in barrier strip provides the balanced line­level Main Output from the mixer. An output isolation transformer
(model IT-B) is available as a user installed option (see Options on
pg. 4). For balanced connection, wire high (+), low (-), and ground



(

). For unbalanced connection, wire high (+) and ground (),

leaving (-) unconnected. Signal level will be reduced by 6dB when
output is unbalanced. Main Output level is affected by the front
panel Master control, as well as by remote control (see Remote
below).

Stack In: This plug-in barrier strip provides the balanced line-level
Stack In to the mixer. Signal entering here is combined with
signals from the input channels, and is then sent to the Main
Output section. When using multiple 801 mixers within a system,
connect Main Output of one mixer to Stack In of the next mixer,
and so forth. All mixers except the final 801 should be assigned as
‘slaves’ (see Master DIP Switches below). For balanced
connection, wire high (+), low (-), and ground (

connection, wire high (+) and ground to both (



). For unbalanced



) & (-).

Remote: This plug-in barrier strip provides connection for an
optional remote master level control (model RP-L1) (see Options
on pg. 4). An external potentiometer (5k~50k ohm linear taper) or
external ramp voltage (0~+10VDC) can also be used.
Potentiometers are wired high (V), wiper (C), and low (



voltage is wired positive (C), and ground (

). The Remote port

must be enabled before remote master level control is possible
(see Master DIP switches below).

input

hp filter

8

duck aux



). Ramp

patch

pad

priority

hp filter

phantom

duck aux

duck aux

patch

input

pad

priority

hp filter

phantom

patch

input

pad

priority

76

phantom

duck aux

duck aux

patch

input

pad

priority

hp filter

phantom

patch

input

pad

priority

hp filter

5

phantom

patch

input

pad

priority

hp filter

43

duck aux

phantom

duck aux

patch

input

hp filter

2

input

ONONONONONONONON

pad

priority

hp filter

phantom

duck aux

Main Patch: This 3-conductor TRS ¼” phone insert jack is for
connection of other BIAMP products or external devices at the
Main Output section. The Main Patch jack is pre-Master Level,
and is wired Tip (send), Ring (return), and Sleeve (ground).
Certain BIAMP products require a single TRS ¼” phone cable for
connection. Other devices may require a special ‘Y’ cable. If a
pre-Master Level output is desired, connect to Main Patch with Tip
& Ring (send) and Sleeve (ground).

Patch (Channels 1~8 & Aux): These 3-conductor TRS ¼” phone
insert jacks are for connection of other BIAMP products or external
devices to the individual input channels. Patch jacks are pre­Channel Level, and are wired Tip (send), Ring (return), and Sleeve
(ground). Certain BIAMP products require TRS ¼” phone cables
for connection. Other devices may require special ‘Y’ cables. If a
pre-Channel Level direct output is desired, connect to Patch with
Tip & Ring (send) and Sleeve (ground).

Input (Channels 1~8 & Aux): These plug-in barrier strips provide
the balanced mic/line Inputs to the mixer (Channels 1~8 only).
Input isolation transformers (model IT-A) are available as a user
installed option (see Options on pg. 4). For balanced connection,
wire high (+), low (-), and ground (

wire high (+) and ground to both (



). For unbalanced connection,



) & (-). Phantom power

(+24VDC) is available (see DIP Switches below), with +48V
phantom power as an option (model 48VPS) (see Options on pg.

4). The Aux input accepts either balanced mono line input or
unbalanced stereo line input (see DIP switches below). Aux input
cannot accept mic input signal, or the optional input isolation
transformer, and does not provide phantom power.

Master DIP Switches: These switches assign functions to the
mixer as a whole (when pushed up). Slave
an expander to a ‘master’ mixer. Tone Out
panel tone controls (Bass & Treble). Override

assigns the mixer as

bypasses the front

allows automatic
muting of all other inputs when signal is present in Channel 1.
Remote

allows remote control of Main Output level, by enabling

the Remote terminals (see above).

DIP Switches (Channels 1~8 & Aux): These switches assign
functions to the individual inputs (when pushed up). Pad
attenuates channel signal -18dB (-10dB at Aux) for line input.
Priority

disables Channel 1 Override muting for that channel.
Phantom
condenser mics). Duck Aux

(Channels 1~8 only) turns on phantom power (for

(Channels 1~8 only) allows channel
signal presence to activate -15dB attenuation at Aux input
(ducking). HP Filter
(6dB/octave @ 170Hz). Sum

enables a high-pass filter on the input

(Aux only) converts Aux from

standard balanced input to stereo (L/R) summing input.

1

3