RPQ500 Preamp Module

The RPQ500 is a powerhouse that provides unparalleled high gain with low-noise. With 81db of JFET output, the RPQ500 gives you enough juice to record soft sources without ever having to worry about noise.

With the RPQ500, you will never consider a source too quiet to record with a ribbon mic ever again. Passive ribbons with low output levels require preamps that supply a high level of output. If the preamp you use doesn’t have enough clean gain, the mic signal may seem too soft or noisy which may be apparent when recording quiet acoustic guitars or strings, especially at a distance or with long cable runs. The RPQ500 eliminates this concern.  

Specifications

• Gain at 1kHz: 81dB of gain at 1kHz, balanced-in to balanced-out in Microphone Input Mode
• Noise figure, rms A-weighted: < 2dB
• Noise figure, rms unweighted: < 3dB, 20 kHz LPF bandwidth
• EIN: < -130 dBu A-weighted, 150 Ohm resistive source
• Frequency response: -3dB < 1Hz and > 100 kHz
• THD: < 0.02% at 1 kHz
• Input impedance: 10K Ohms
• Balanced Line Input Impedance: 20K Ohms
• Input Gain control:    Twelve-position switch provides from +13dB to +62dB of gain for the preamplifier circuit, as measured between the input and the before the output line driver.
• Switched LF Shelving filter: -3dB break-frequency tunable from 18 Hz to 360 Hz; maximum reduction -20dB.
• Switched CurveShape EQ:     +3dB break-frequency tunable from 2.5 kHz to 30 kHz; HF gain adjustable from +0 dB to +18 dB; the slope of the HF filter varies interactively and directly with the CurveShaper™ frequency and gain settings
• Color LEDs: Green, Yellow, Red
• XLR output maximum level into 600Ω load: +28 dBu, balanced; 0 dBu = 0.7746 Vrms
• XLR connectors polarity: Pin-1 is ground, pin-2 is high, pin-3 is low
• LED signal level indicators: The green LED snaps on at -20 dBu to indicate the presence of signal; the yellow LED snaps on at 0 dBu; the red LED snaps on at +24 dBu to warn of approaching signal overload

External Features:

• Laser engraved front panel markings
• Grayhill series 71 stepped gain switch
• Internal Operating Voltage: Bipolar 17V

Dimensions:

• Size: 1.5” w, 6.8” d, 4.5” h (3.8cm x 17.27cm x 11.43cm)
• Weight: 11.7oz (~0.33 kg)