Biamp 801i User Manual

801i

Mic/Line Mixer

Operation Manual

Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com

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Introduction
Front Panel
Rear Panel
Remote Control
Specifications & Block Diagram
Warranty

TABLE OF CONTENTS

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July, 2009

801

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INTRODUCTION

The 801i is a single rack-space mixer, with ei
balanced, discrete transistor preamplifier for low noise and low distortion performance. Special features, including a limiter and remote
level control, make the 801i extremely versatile. The 801i mixer is dependable, easy to install, simple to operate, and carries a five­warranty.

801i features include:

♦ eight differential balanced mic/line inputs & one aux line input
♦ discrete transistor mic/line preamps for low noise & distortion
♦ +24 volt phantom power selectable on each mic/line input
♦ 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

ht mic/line inputs and one auxiliary line input. Each mic/line channel uses a differentiall

♦ unbalanced direct output terminal on each input channel
♦ 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 automatic override assignable on other channels
♦ optional remote control of main out via external level control
♦ stack in & slave switch to add inputs by linking multiple units
♦ covered by Biamp Systems' five-year warranty
♦

marked and UL / C-UL listed power source

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FRONT PANEL

+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.

-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 801i, the red On indicator remains lit.

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