Electrical Audio EAPreq500

The EApreq500 is our transformer-based microphone preamp/equalizer formatted for the 500-series environment.  The preamp is designed to allow the subtle character of the input transformer to color the sound with very little noise or amplifier distortion.  The shelf EQs are boost only, to broadly add bass and/or treble when desired.  A design premium was placed on long term reliability, and flexible application.

The Basics

•   Low distortion Lundahl input Transformer.  Provides slight coloring as input level gets higher.

•   16-position, gold contact, rotary gain switch ranging from 20 to 65dB of gain, 3dB per step.

•   -20dB input pad switch - sealed gold contact relay

•   Polarity reverse switch - sealed gold contact relay across the output for quietest operation

•   48v phantom power switch - standard application

•   Low and High frequency shelf boost EQ. controlled with a solid multi-section gold contact switch, 5 gain positions.  A sealed relay bypasses the EQ circuit when not in use.

•   DC servo for both preamp gain and shelf EQ make-up gain amplifiers.  This provides long term predictable operation and sonics, avoiding the gradual decline that comes with electrolytic capacitor-coupled circuitry

•   Ground-sensing solid state balanced output amplifier capable of driving 600Ω loads with ease, balanced or unbalanced.

•   Clear green LEDs indicating which shelf band is engaged.

•   Bright, amber colored “peak” LED warn just before clipping.

•   The performance of the preamp, and shelf EQ are closely matched across all EApreq500s.    

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Full manual for more information.