Dual RPA 500
  • 2-channel high gain RPA tube mic preamp
  • Separate 26dB pad, phase reverse, 75Hz HPF, phantom power for each channel
  • Separate 20 segment LED meters
  • Separate mic limiters for input overload protection

The Dual RPA 500 is a two channel, tube mic pre inspired by the popular Channel and 207D preamps. Our Dual RPA 500 features the Aphex patented Mic Limiter technology from the 207D and 1788A that works before the preamp. With the limiter on, it is nearly impossible to clip the input of the preamp.

  • Front panel 10Mohm, ¼” inputs for the connection of instruments like guitar and bass. These inputs override the inputs on the rear of the receiving frame when connected.
  • 3-way switches allow the selection of +16, +20 or +24dBu output levels.
  • The 20-segment input meters allow input levels to be easily seen, even from a distance.
  • 65dB of gain to properly operate dynamic, condenser and ribbon microphones and a 26dB pad for very loud sources.
  • Illuminated buttons control Phantom Power, Phase Reverse, 75Hz High Pass Filter and Mic Limiter on/off.
PAR 500 Series Review
Pro Audio Review "Studio Review," October 2013


Live Performance - One of the reasons that the 207D is so popular for live performance is because of the patented Mic Lim technology featured on each input. This circuit limits transients before the preamp, protecting the preamp from clipping and anything later in the signal path from receiving a clipped signal. The Dual RPA 500's Mic Lims are perfect for use on snare drum, kick drum or drum kit overhead mics.

Professional Studio Recording - The Dual RPA 500 is a hybrid design, with solid state front end for fast transient response and a tube back end for warmth and gain. It’s the best of both worlds! The ¼” input also makes it easy to run instruments through the mic pre without using a direct box.

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Type Transformerless, Instrumentation first stage, RPA tube second stage
Impedance 2.2k ohm nominal
Instrument Impedance 10M ohm nominal
CMRR >70dB @ 60Hz
Gain Range +25dB to +61dB (no pad, +24 level)
Pad 26dB
Max Input Level (limiter off) 0dBu (no pad), +26dBu (pad)
Limiter Aphex MicLim
Low Cut 2rd order, -3dB @ 65Hz
Type Active true-balanced
Nominal Level +4dBu
Maximum Level (Meter 0dB) +24/+20/+16 dBu switchable
Impedance 100 ohm nominal
THD <0.15% @ +4dBu out
Frequency Response +0.1/-1.0dB <10Hz to >100kHz
EIN -124dBu @ max gain
Current draw 160mA per slot, 320mA total

All specifications are subject to change without notice.

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Promo Materials (click to download PDF)

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