Audio Proz Service and Sales


Acoustic Research Model 8.3 Phantom

Audio Proz Inv #: 60535

(Pair) Slim line aluminum cabinets. Mirror image placement of speaker drivers. Replaced with softer dome midrange nicer audio quality for audiophile range. Added cabinet dampening. #9 condition

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ADC Sound Shaper Ten

Audio Proz Inv #: 56569

20 band stereo cap and coil equalizer. Black face with handles. Left/Right meter control, Line/Rec, Bypass/EQ controls, Tape 1/2 monitor. Faders have red LEDs, RCA in/out. This is an excellent unit with low hours use, and has been fully tested and serviced. Condition: 9

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ADS L-710

Audio Proz Inv #: 62999

(Pair) 3-way, double woofer, dome midrange + Tweeter. Walnut Cabinets in excellent condition (21.75"x12.25"x10.5"), knit brown grills - few pulls upper right hand corner). AP modded version 4 to correct midrange balance and impedance (woofer inductor 1.0mH to improve bass). Excellent sounding full range Hi Fi speaker!  Woofers professionally refoamed. #9 condition.

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Advance Model A/W

Audio Proz Inv #: 63811

(Pair) Nice Walnut Cabinets (24 5/8"x 14 5/8" x 10 3/4"). 2 Way with 10" Passive radiator, 1" Peerless Soft Dome Tweeter, 8" Woofer. Woofers/ Passive Radiator had Professional Refoam. AP added a 1mH inductor on Woofer to improve voicing + tighten the bass. Slightly bright, designed for large room grills/Cloth in excellent condition (No tear holes or warpage). 1 Brass logo is missing. #8+ condition Sounds very good, tight bass, real nice.

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Alto TS110A

Audio Proz Inv #: 62872

(pair) Truesonic 10" 2 way powered PA speakers. (2) XLR/ 1/4" combo input connector, contour switch, and ground lift switch. Tightened connection and resoldered amp board where suspected. #9 condition, heat ran, serviced, and test played

$ 240  Contact Us  


We offer expert time-saving advice on repairing many types of home and studio equipment, as well as consulting for product and recording issues, at a fair and reasonable cost.  For complex matters, we sometimes must charge a small technical fee.  If we can help solve your repair problem or technical conundrum, give us a call.  (617)926-8020.


ART DRX digital multi fx

Audio Proz Inv #: 28091

single space rack unit, excelent shape. stereo in/out. 2 second sampler and multi effect. Excellent shape.

$ 200  Contact Us  

Art Pro VLA II

Audio Proz Inv #: 59467

REV2. NEW. 2 Channel vactrol compressor. With 2 channel modified with compression EQ. Condition: 10.

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ART Pro Channel

Audio Proz Inv #: 43860

Tube microphone preamp. Audio Pro Modified for tube harmonic enhancement circuit, high quality USA Sylvania 12AX7A tube, also has IN/OUT phase, second harmonic enhance Control. Six stage tube design for preamp, compression, and equalization. New stock fully QC'ed. With true tube "Gain Cell" compressor. Super spec unit.

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Art Pro Channel

Audio Proz Inv #: 54689

Modified vactrol variable transformer dynamic EQ, and variable tube bias mod. Professional tube microphone pre-amplifier. Tube/optical compressor. +48V phantom power supply. With true "tube gain cell" compressor. B stock.  See more details about the mod here, https://www.audioproz.com/AP.php?Article=19&Tab=Modifications

$ 548  Contact Us  

ART Pro MPA

Audio Proz Inv #: 50897

Two channel microphone preamp with analog VU meters. 1/4" and XLR in/out, switchable gain, phase and Phantom, HPF adjustable 65Hz to 7Hz. With "Pultec" style cap and coil dynamic equalizer circuit. Excellent condition.  This unit has been heavily modified.  Read more about the modification here.

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ART PRO MPA II

Audio Proz Inv #: 57640

Two channel Mic/HiZ. M/S Matrix. Variable input Impedance. Variable plate voltage. QC- Lubed, Burn-in, switches exercised. #10 Condition (New).

$ 328  Contact Us  


If you are having trouble finding parts, enter the name into our search bar at the top of the page. Please be aware there is a minimum $4-$6 to ship any part. International orders will be $14-$16 to ship for anything larger than an envelope. Shipping costs are non negotiable, so please, PLEASE do not ask for a part, or for us to search for, or quantify a part if you cannot pay for the shipping.


Audio Technica AT4071A

Audio Proz Inv #: 38007

Line/Gradient shotgun condenser capacitor microphone. Particularly useful for miking dynamic action in film/TV audio as well as in “spot” miking techniques in the music studio or theater. Like new condition, obvious display box wear. (no foam windscreen)

$ 568  Contact Us  

Audio Technica ATW-1031

Audio Proz Inv #: 30167

Rackmount Wireless Diversity System. Belt pack frequency 13C (211 MHz). With 1/4" connection for guitar. Also includes AT-830cx Lavalier mic. Like new, #9 condition. ** Special Sale! **

$ 360  Contact Us  

Behringer Truth B2031P (pair)

Audio Proz Inv #: 56025

For sale Audio Pro Rev. 4/5 Modified passive version. New. 2 way passive monitor speaker (pair). Audio Pro modified. Rev 4 Design. Custom cabinet damping. Model 2031A are amplified speakers. I suggested 2031 passive design, and to use any good 40-100 Watt amplifier. Check out the Behringer website for a picture. A modified set is $448. We modify the 2031 to be a near field monitor where midrange tone is "warmer" or slightly receded image by a 3db through about at octave between 800 - 2000 H3. A far field monitor version is slightly brighter or stronger midrange and designed to listen at 4 to 8 feet distance. Basically flat response is perceived at that range. Near field version is for 2 to 5 feet away listening, and indeed most BSEE acousticians agree that a near field should be dipped in midrange. In both cases, the modification consists of improved multi section crossover (it presently has a very simple 4-part crossover) as well. We install a dampening blanket between the internal chambers, dampen tune one of the port slots and finally apply soft felt clone dampeners to improve midrange level and tonal match to crossover. The cabinet is now tuned to reproduce 40 Hz powerful and clean. The speakers are very heavy design with cast frame woofer, using high density MDF cabinet, very well done. No grill cloth is included by design. Shipping can be $38 or so to get them to you.

$ 488  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 RP533

Audio Proz Inv #: 60665

Modified with transformer, Automatic EQ compressor. This design allows deep bass and impulse response to be enhanced and less high frequency attenuation and clarity enhancement circuit. Unit has a ground modification and capacitor update for 6db noise floor improvement. This version has a 4560 op amp upgrade for line out balanced out. Mic pre amp RFI suppression capacitor. Modified with first stage tube harmonic bias control (right control) Cleaned switch with silver paste. #9 condition

$ 800  Contact Us  

Bellari RP533

Audio Proz Inv #: 50898

Studio tube compressor/limiter preamp. AudioPro modifications to optimize tube gain and noise, power supply updates, phase switch pad and hi gain switch added on front panel. Excellent #9 condition.

$ 520  Contact Us  


We have been selling and repairing professional and consumer audio equipment for over 40 years. (Read some of our customers testimonials here)

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.


Beyer M 69 N (c)

Audio Proz Inv #: 59267

New in box W/ Spec Papers. Product from 20 years ago. Comes with Beyer Mic Holder. SN #: 53464. Part of shop owners personal collection. tested OK #10 condition

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CAD D82

Audio Proz Inv #: 58134

matched pair can be made avaliable for $160 each or $310 the pair. Ribbon microphone. Figure 8 pattern. Very highly recommended ribbon mic. New in box.

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CAD Trion 6000

Audio Proz Inv #: 44554

Multipattern condenser microphone with omni, figure eight, and cardioid pick up patterns. AP Rev3 modified! -10dB pad is vintage dampening to remove stridency and make less sibilant and warmer. High pass filter is dip filter, pulls mid vocal back, source seems farther away. Welded board grounds. Upgraded capacitors. Superspec quiet unit. Pattern switching takes longer due to improved power supply.

$ 280  Contact Us  

CAD Trion 8000 Tube mic

Audio Proz Inv #: 46246

Three position pattern tube microphone. New stock, tested, QC'ed, and burned in by AP. Low noise tube. Includes flight case, shock mount, cable, and power supply. Selected low noise tube, we recommend this mic for vocals, and acoustic instruments. #10 condition Call for best pricing!

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Crate Stealth-50 GT-50

Audio Proz Inv #: 60360

With 16ohm Clestion Vintage 30 speaker, impedance speaker matching switch gives different tone qualities. Spring reverb. 4 6V6 Amplifier, excellent, 4 new Sovtek 6V6 tubes installed, 2 channel IN, multiband EQ, FX send loop, footswitch. 8/10 condition cleaned, calibrated, major super-ruggedization, doubled upon grounds, tested reverb/speaker. new fuse holder.

$ 348  Contact Us  

Crown Powerline Two

Audio Proz Inv #: 58562

PL-2. 2 Level adjuster. Output monitor jack. RCA input. Face plate is good condition but rack handels have obvious scratches. Complete service. Unit in low, 8 condition.

$ 300  Contact Us  


Need your guitar or bass amp tuned up? We are now doing repairs, upgrades, and modifications to all types of guitar amps. Orange, Mesa Boogie, Fender, Marshall, Hughes and Kettner, Peavey, Ampeg, Gibson, Silvertone, etc. Read more about it here


DBX 3BX Series I

Audio Proz Inv #: 58712

3 band dynamic range expander. 0-50% expansion. Gain exchange LED system. Transition level fader module. Easily understood recording functions. Beautiful stained wooden panels. 9/10 condition (all clean calibrated).

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DBX DX-8

Audio Proz Inv #: 63330

Noise reduction module, 8 channel in/out, individual channel encode/decode. SN #21058. *Needs relay cleaning upon sale. Unit mint in original box, box is damaged/torn but repairable. #9 condition

$ 360  Contact Us