Biamp 601 User Manual

301 & 601

Mic/Line Mixers

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

301 & 601

TABLE

OF CONTENTS

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August, 2009

301 & 601

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INTRODUCTION

The 301 & 601 are sin
transistor mic/line preamplifier for low noise and low distortion performance. Inputs are provided to accept signals from microphones
and/or line level devices. Special features, includin
601 mixers are dependable, easy to install, simple to operate, and are covered by Biamp Systems’ five-year warranty.

301 & 601 features include:

♦ three electronic balanced mic/line input channels (301)
♦ six electronic balanced mic/line input channels (601)
♦ 30dB rear panel Pad switch on each input channel
♦ 40dB screwdriver-adjust Trim on each input channel
♦ +10dB Peak LED indicator on each input channel
♦ rotary level control on each input channel
♦ auto-muting of one channel for "talk-over" applications
♦ +24 volt Phantom Power assign switch on each input
♦ electronic balanced main output with rotary level control
♦ remote control of main level from up to 2000 feet away
♦ main patch insert point for external processing devices
♦ main stacking input accepts signals from other mixers
♦ screwdriver-adjust tone controls & limiter on main output
♦ -20dB Signal Present LED indicator for main output
♦ all input/output/control on plug-in barrier strip connectors
♦ covered by Biamp Systems’ five-year warranty

marked and UL / C-UL listed power source

♦

le rack space, three input & six input mic/line mixers. Each input channel uses a differentially balanced, discrete

limiters and remote level control, make the 301 & 601 extremely versatile. The 301 &

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FRONT PANEL

Trim: These screwdriver adjustable controls provide 40dB of gain adjustment to compensate for different input signal levels. For best
performance, adjust Trim so the +10 Indicator flashes only on occasional peaks in signal level (see +10 Indicator below).

+10 Indicator (Peak): These red LEDs indicate signal level in the channel has reached +10dB (8dB below clipping). For best
performance, adjust Trim so the Peak Indicator flashes only on occasional peaks in signal level (see Pad on next page).

Channel Level: These controls adjust the level of channel signal sent to the Main Out section. Level control settings will vary from
channel to channel, depending upon the desired mix. However, for best performance, higher settings should center around the 12 o'clock
position (unity gain). One of the channels includes a level "ducking" feature, which can be triggered when signal is present in selected
other channels (see Ch 3/6 Duck on next page). This "ducking" feature is useful in page-over-music applications.

Bass: This screwdriver-adjustable control sets the low-frequency equalization (Bass) for the Main Out section. Bass is a shelving type
filter, which provides +/-10dB of gain adjustment for frequencies below 100Hz.

Treble: This screwdriver-adjustable control sets the high-frequency equalization (Treble) for the Main Out section. Treble is a shelving
type filter, which provides +/-10dB of gain adjustment for frequencies above 10kHz.

Master Level: This control adjusts the overall level of signal sent to Main Out (see Rear Panel: Main Out on next page). The Master
Level control is used to make adjustments in volume level. However, for best performance, higher settings should center around the 12
o'clock position (unity gain). Sound system amplifiers may then be set for the appropriate volume level. Main Out level can also be
adjusted via remote control (see Remote on next page).

-20 Indicator (Signal Present): This red LED indicates signal level at the Main Out is above -20dB (normal signal level). Once the
Master Level control has been adjusted, this indicator will remain lit whenever signal is present at Main Out.

Threshold: A limiter is provided at the Main Out section to help eliminate unwanted peaks in program signal level. This screwdriver
adjustable control sets the threshold level, at which the limiter is activated. For most applications, set this control so the Limit Indicator
flashes only on occasional peaks in signal level (see Limit Indicator below). Counter-clockwise adjustment lowers the threshold, increasing
the amount of limiting. Clockwise adjustment raises the threshold, ultimately removing the limiter from operation. This control is factory set
fully clockwise (limiter off).

Limit Indicator: This red LED indicates when the limiter is activated by program signal levels that exceed the threshold setting.
On Indicator: When the power transformer is plugged in, and AC power is applied to the mixer, the red On indicator remains lit.

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