Audio Proz Service and Sales


Bellari RP-583

Audio Proz Inv #: 23887

Engineering model, modified-rev 6, unit has updated board installed-RP282 to RP583, dynamic eq bias/channel tracking within +/-2dB, assymetrical RMS/detector circuit installed, logarithmic slope detection, PS modifications/head room and noise mod. Calibrated +/- 1db channel to channel. Too much to list, call for details.

$ 880  Contact Us  

Bellari RP-533

Audio Proz Inv #: 23734

Heavily modified by Vince. 7 new switches, overdrive control, combo mic pre/comp/eq with many added features. Low noise high gain tube modification. 2 Band Bass/Treble. Front panel paid gain/phase switch. Tape saturation control. Smooth fast compression switch. High gain / bright switch. Power supply ground mod. Transformer EQ optical mod. This is the cats meow! Call for details 617-926-8020. Top flight cosmetic condition #8 with just a tiny bit of rack rash. 

Some additional information customers have asked about:   This unit is 90% all tube, the op amps are for RMS, DC control, balanced out not audio! What I do is make the circuits have more head room less noise better tube character and more correct RMS detector tracking. As you may have noticed the output circuit clips badly and is nowhere close to semi-pro level. It's a wrongly done balanced line op amp stage. Also the compressor threshold and ratio controls are too sensitive, as such the unit can go into a strange and not very likable distortion if pushed. There is some good basic design circuits in this, but just not enough. My mods are not about installing fancy parts it's about improved circuit performance

$ 680  Contact Us  

Bellari RP-282

Audio Proz Inv #: 40044

Tube Stereo Compressor, rev. 4. Designed to accomodate +14 to +24db operation. Matched Vactrol. Basic update for improved tube gain/noise. Improved Vactrol circuit and matched channels. Improved threshold, range compressor. Change of design to cathode feedback dynamic bias / tube harmonic. Engineering Sample (#9 condition). Volume levelling compressor (brings volume up, matched tubes).

$ 680  Contact Us  

Behringer T1952 tube compressor

Audio Proz Inv #: 47419

 Vinc -Audio Pro Modified for enhanced, adjustable tube dynamics with controls on front panel. Stereo tube compressor  XLR or phone in/out, -10/+4dBm switchable,  Extremely accurate calibration; channel to channel is only +/- 1dB over 60dB range of operation.  Also installed highest quality Behringer OT-1 output transformer. This unit has tube harmonic equalizer circuit installed, does variable 2nd harmonic adjustments. (is our shop engineering sample for variable true tube harmonic equalizer effect). #9 Excellent condition, no box, unit warrantied.

$ 580  Contact Us  

ART Pro Channel

Audio Proz Inv #: 48537

Tube mic preamp/compressor/equalizer. AUDIO PRO MODIFIED: Tube Harmonic T.H.E. Bias control transformer in Vactrol EQ Mod. Highly recommended, Super noise spec machine!  QC, Test All. #10 new in box

$ 568  Contact Us  


Local customers, please do not come to the shop without calling ahead first - (617) 926-8020 - for an appointment, so that we can more efficiently help you with your equipment or sound recording needs.

We keep our database up to date with almost 10,000 items in stock. If you see a part number and a price, we have that item in stock. 

Customers outside of the US, please note that international shipping can be costly (US Post $16 minimum - up to 8oz or 226g). We are glad to combine orders to reduce shipping costs. Take a look at our shipping policies for more information and estimates of prices and shipping time.


Presonus CL44

Audio Proz Inv #: 42379

Quad compressor/limiter. 4 chan (2 linkable in pairs) comp/limiter. Lo-pass filter, sweepable 20hz-20khz. Compand, threshold, ratio, gain, attack, release, and limit knobs. Optical, link 1/2 (3/4), auto and bypass switches. 10-led metering of gain reduction. XLR and 1/4" in/out with side chain input. Nice performance, good build quality! #9 condition with some minor rack rash. With manual.

$ 460  Contact Us  

Presonus ACP-8

Audio Proz Inv #: 47226

Eight channel analog controlled dynamic processor, full function compressor and noise gate. Excellent #9 condition, one knob missing to be replaced with nonoriginal. Professionally cleaned, serviced, and tested.

$ 420  Contact Us  

Presonus ACP-22

Audio Proz Inv #: 42382

Stereo/2-chan compressor/limiter/noise gate. High spec spectral noise gates. Balanced XLR in/out, balanced 1/4" in/out with side chain. All controls and switches cleaned, all functions check ok! With Manual. #9 condition, minor rack rash.

$ 360  Contact Us  

Behringer T1952

Audio Proz Inv #: 51952

Stereo tube compressor. Super spec noise and calibration unit with minor AP-modifications of critical tube selection and internal calibration to allow "warmth control" to create in phase or out of phase perfect second harmonics of .2 to 1%. (Warmth meter will now read lower than original.) Noise mod in power supply. Excellent condition.

$ 360  Contact Us  

Symetrix 522

Audio Proz Inv #: 27811

Limiter Compressor, 2 ch. Slave switch/external detector, RF earthing cap, minor upgrades, excellent condition. #9  Unit with Valley People VCA Modules---NPW Probably SOLD Similar unit available

$ 340  Contact Us  

Behringer Tube Composer T1952

Audio Proz Inv #: 42708

Unit has super spec controls. Two channels of expander/gate and compressor/limiter. Two 12AX7 tubes to add harmonic character. Both channels track within 0.5 db of each other! Up to 60db range of compression. Modified for more pleasing 2nd order harmonic enhanced sound. Demo unit, with box, packing and manual. Please call for details.

$ 340  Contact Us  


We know you have many options for purchasing audio equipment and parts, and we truly appreciate your business.  We strive to offer good products at competitive prices.  While we can't always match the prices of one isolated reseller, we make up for it by carefully selecting, testing, and finding unique and special rare parts, and we are here for the long run.  We guarantee everything we sell and we hope it helps you to enjoy a great listening experience.

We keep our database up to date with almost 10,000 items in stock. If you see a part number and a price, we have that item in stock. 

Customers outside of the US, please note that international shipping can be costly (US Post $16 minimum - up to 8oz or 226g). We are glad to combine orders to reduce shipping costs. Take a look at our shipping policies for more information and estimates of prices and shipping time.


Symetrix 522

Audio Proz Inv #: 61364

Limiter, Ducker 2 channel, true balanced IC socketed op amp design. Uses Valley People VCA modules. Calibrated. Low use unit from Shop owners studio, No Rack Rash. #9 condition

$ 340  Contact Us  

Behringer Composer MDX2100

Audio Proz Inv #: 23554

Demo, compressor/limiter/expander/gate, 2 channel, XLR and 1/4" ins and outs, original like new, better built, better performance, excellent high accuracy compressor, channel matching for tracking is superb

Units vary in retail cost due to condition. Real nice, modified, low use units get more money. The simple fact is this era design compressor is the same as the DBX XT !! But I modify many designs with more R.F.I. suppression and less R.M.S. detector noise getting into the audio V.C.A. (check the internet if not familiar with the abbreviations) Simply put, mods make a slightly cleaner, better accuracy and control of compression of the audio signals. This is done to accommodate today's higher quality signals from microphones and the intense dynamics in modern music.


**We want to be your Behringer dealer! After being among first to champion this great manufacturer, we are offering our most competitive pricing to be your Behringer supplier.**

$ 300  Contact Us  

DBX 163x and 463x

Audio Proz Inv #: 50904

Compressor and noise gate pair mounted together in rack. Very good #8+ condition with many tiny minor scratches on ears and face.

$ 300  Contact Us  

Behringer MDX-2100 Composer

Audio Proz Inv #: 26386

Composer Compressor, Has upgrade RMS detector mods. Super Low noise P.S. mods. Channel matching/compression calibration. Call for Details.

$ 280  Contact Us  

Symetrix 525

Audio Proz Inv #: 14570

Dual compressor, expander gate w/ compressor limit threshold output level, uses Valley People VCA modules, phone in and out, process loop in and out, new control installed.

$ 280  Contact Us  

ART VLA 500

Audio Proz Inv #: 58673

500 series format plug in. Top quality vactrol design. 10 (new) condition.

$ 248  Contact Us  


We leave "SOLD" items on our website for machines that we often repair and provide parts for. This is to give you an idea of the products we typically carry, and direct you to alternatives you may not know about - we often have substitutes for out-of-stock parts, and are happy to recommend workarounds and different solutions to common problems.


FMR Audio RNC1773

Audio Proz Inv #: 48385

"Really Nice Compressor," with controls for threshold, ratio, attack, release, and gain. Bypass and "super nice" switches. The RMS digital detector circuit in this unit causes chattering and gulging noise in the audio, especially at low threshold settings. We modified the circuit to improve the audio quality and give the threshold control better range. Unit is now more accurate, releases fast and consistently, and compressed voice of instruments is cleaner and more detailed with subtle dynamics. Like new condition, with power supply and manual.

$ 240  Contact Us  

DBX 117

Audio Proz Inv #: 59427

Modified to do greater compression and expansion range. For studio use or consumer. Has old style metal shielded modules similar to old DBX 160 series RCA in out. but unit will operate sem pro +14db levels now.

$ 240  Contact Us  

Behringer Intelligate XR 2000

Audio Proz Inv #: 34678

Excellent mint condition as new, with original box, packing, and manual. Great multifunction 2 channel gate, excellent spec.

$ 220  Contact Us  

Behringer T1952 Tube Composer

Audio Proz Inv #: 41815

Vacuum Tube Processor, 2 channels, Gate/Expander, Comp/Limiter and Warmth controls, Ultra-low noise, QC check ok: all switches match with 1db on both channels

$ 208  Contact Us  

Behringer MDX-1000 Autocom

Audio Proz Inv #: 17203

This is the older, more well built version compressor, actually a DBX 166 or 160x design (licensed to Behringer), with all controls and switches done better. I also correct a design flaw in these units (there is some sonic distortion and crosstalk of the controlling voltages into the VCA) and improve the power supply decoupling. Vince personally uses one of these units in his synth studio for final mix.

$ 200  Contact Us  

DBX 166

Audio Proz Inv #: 63992

2 channel Compressor, one of the best. Modified P.S ground and shields on VCA, with Rack ears. Super high spec Calibration. Low use, all cleaned and calibrated. #9 condition  +- .5db over 80 db range compression 

$ 188  Contact Us  


All Remotes are now 25% off or Free Shipping!!!  (Reel to Reel remotes excluded).


DBX 166A

Audio Proz Inv #: 55205

Two channel compressor/ limiter Threshold/ Release Controls on Expander/ Late Threshold/ Ratio. Output gain on compressor Peakstop level on Limiter Contour/ Stereo Controls LED indicators, bypass control, #9 condition virtually unused. Minor rack rash.

$ 188  Contact Us  

Art Pro VLA

Audio Proz Inv #: 50695

2 Channel Vactrol/ tube leveling amp, 2 TRS inputs/outputs, 2 XLR inputs/outputs, threshold, ratio, output controls, complete service, power supply mod 35V caps #9+ condition

$ 180  Contact Us