Audio Proz Service and Sales


DBX DUAL 155

Audio Proz Inv #: 8130

2 sets rack. Cleaned all front panel switches, play and rec. Calibrated controls, calibrated for 0 dB. Checked calibration .5 dB difference max between channels. Checked crosstalk, 3 mv internal between record in and play out max. Mint Condition.

$ 550  Contact Us  

Phase Linear 1000

Audio Proz Inv #: 56265

Auto correlator noise reduction system with Rev 6 modifications, low noise TLO75 IC update, some capacitor update. Dynamic range recovery system. Wood case, vintage knobs. Low frequency calibration. 9/10 excellent condition.

$ 388  Contact Us  

DBX 158

Audio Proz Inv #: 22598

8-channel Noise reduction System! Has 8 DBX 410 cards. Mint condition.

$ 360  Contact Us  

DBX 158

Audio Proz Inv #: 25466

8-channel Noise reduction System! w/ 5x410 and 4x411

$ 340  Contact Us  

Presonus GTX44

Audio Proz Inv #: 42380

4-chan noise gate/expander for pro use. Balanced XLR in/out with unbalanced 1/4 in/out. Key input. Fully tested and cleaned. #9 condition with some minor rack rash. With manual.

$ 340  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.


DBX 172

Audio Proz Inv #: 16489

Dual channel expander and gate with balanced ins and outs. Like new with original box and manual, used only a few times as a rental demo. The best gate ever made!

$ 320  Contact Us  

Phase Linear 1000

Audio Proz Inv #: 59325

Autocorrlator noise reduction system. Dynamic range recovery. Peak unlimiter/down Expander, Autocorrelator. Low freq, calibration controls. Many modifications,crucial capacetor update for better performance and channel to channel spec. ground MOD for super low noise.

$ 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  

Symetrix 511A

Audio Proz Inv #: 23052

Modified w/ ground lift switch. Excellent Cosmetic Condition!

$ 280  Contact Us  

DBX 157

Audio Proz Inv #: 38484

Declinear Noise Reduction System. With AP power supply upgrades, totally cleaned, serviced, calibrated. Nice wood sideboards, excellent mechanical and cosmetic condition. This unit contains a valuable VCA module.

$ 280  Contact Us  

Tascam DX-4D

Audio Proz Inv #: 43745

DBX I noise reduction. 4 channel professional noise reduction with 4 channels of direct inputs and 4 channels of direct outputs. 4 ch. encode out, 4 ch. decode in. Completely cleaned calibrated and tested in #9 condition. (Minor scratch top cover/rack rash)

$ 260  Contact Us  


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.


DBX 224 Type II

Audio Proz Inv #: 47486

Recording Technology Series, Rack Mount Heavy Duty Real Pro Construction. Simultaneous encode/decode, RCA ins/outs, level adjustment control for record, play (tape) and play (disc). Rack ears included -minor scratches at rack holes, low use unit, cleaned and fully serviced. +/- .5db calibration. #9 condition, 

$ 240  Contact Us  

Rocktron prorax CE1

Audio Proz Inv #: 72659

Gain reduction,  Compressor/ Expander. Tested OK. All switches and controls triple cleaned. Replaced regulator and upgraded main filter cap for regulation. Fully functional unit. Top cover has a fair amount of scratches. Faceplate mostly clean with some signs of use and light scratching. W/ AC adapter (120V AC 60hz 9w, 15v DC 300mA) #8- Condition

$ 230  Contact Us  

DBX 224

Audio Proz Inv #: 41210

Later new version. Stereo type II tape noise reduction, With silver rack ears (with obvious wear) simultaneous encode/decode, older/space rack, front panel: Tape/Bypass/dbx Disc Selection, rear panel: preamp RCA STR I/O, Recorder RCA STR I/O, LUL ADJ, Trimmers: Tape Rec/Play, Disc Play.  Cannot be converted to 220v. Like new cosmetic condition #9

$ 228  Contact Us  

Tascam DX-4D

Audio Proz Inv #: 55359

4 channel DBX with rack ears. Cleaned, tested, minor cover scratches. 8+ condition

$ 220  Contact Us  

DBX RX9

Audio Proz Inv #: 3162

TEAC Noise reduction, needs relays and work on circuit board which we do here.

$ 200  Contact Us  

Tascam DX-4D

Audio Proz Inv #: 62960

with rack ears, SN:430309. Converted FV to always on dbx  #9+ condition 

$ 200  Contact Us  


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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.


Tascam DX-4D

Audio Proz Inv #: 27287

DBX Noise Reduction rack unit. 4 ch, 16 RCA phono jacks on rear, 4 each (input, output, encode out, encode in), selectable 4-channel NR. Unit cleaned throughout. Excellent condition, minor scratches.

$ 200  Contact Us  

DBX 228 Dynamic range expander.

Audio Proz Inv #: 28044

One space rack mount. Unit performs disc encode as well as tape encode/decode.

$ 200  Contact Us  

Rocktron System One 180

Audio Proz Inv #: 47489

Encode/decode noise reduction, 4 stereo channels (8 total ins & 8 total outs). This unit works by reducing an incoming signal so that it remains well above the noise floor and then expanding the clean output signal at its original level. No box or manual. Good condition with scratches on top cover and minor rack wear.

$ 200  Contact Us  

Advent 100

Audio Proz Inv #: 49007

Dolby B noise reduction unit. Correctly restored, carefully calibrated and tested. Very good #8+ condition with some very minor scratches on faceplate and slightly darkened back panel jacks. We can also service and supply parts for these units!

$ 200  Contact Us  

DBX 224

Audio Proz Inv #: 55059

Dbx 224 Later Version -Silver Trim with anodized black face  No Rack Mount -120 VAC - All cleaned and calibrated. #9 condition

$ 188  Contact Us  

Tascam DX-4D

Audio Proz Inv #: 62962

4 channel noise reduction, this version has no FV cable. Converted FV to dbx always on. With rack ears. #8 condition 

$ 188  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.


DBX 150 pair

Audio Proz Inv #: 52073

Type I noise reduction. single rack height x1/2 width. 1 11/16" HTx 8 3/8"W. RACK PAIR. NO RACK EARS. Missing knob on butterfly joint. To/from console, to/from tape rec. Calibration levels A+B on front panel, rec/play in/out switches. Tested and working 9/10 condition.

$ 188  Contact Us  

DBX 180

Audio Proz Inv #: 51899

Single rackspace. This is the best DBX noise reduction system on the market! +4dB, simultaneous encode/decode. 3 wire balance terminal strip on back panel. Used, in excellent #9 condition. Professionally cleaned, calibrated, and tested.

$ 180  Contact Us