| ID # | Model | Description | Sale |
| 49007 | Advent 100 | 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! If you are having trouble finding parts enter the name into search bar | $ 200
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| 40766 | Ashley SC-33 | Rackmount stereo noise gate. Excellent front panel cosmetics. Professionally cleaned, serviced, calibrated by AudioPro. | $ 260
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| 28088 | Ashley SG33 | Single rack space dual channel noise reduction, can do auto fade, cleaned calibrated, minor bend on faceplate and rack rash at mounting holes, otherwise good cosmetic, good knobs, excellent mechanical condition. | $ 260
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| 33843 | Behringer DeNoiser SNR2000 | Multiband Denoiser, 2-Channel Single-Ended Noise Reduction System. Multiband frequency analysis and processing. TAC (Transient Attack Control) dynamic filters respond accurately to signals with fast attacks. Auto-filter circuitry for automatic sliding filters. Integrated IRC expander circuitry. Adjustable cut-off frequency and release time. Noise reduction of up to 80 dB. Dual-mono or true stereo couple function.
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| 41836 | Behringer HD400 2 ch noise reduction | | $ 28
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| 41840 | Behringer HD400 2 ch noise reduction | #10 condition. NEW. SALE | $ 28
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| 41839 | Behringer HD400 2 ch noise reduction | | $ 28
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| 38443 | Behringer MicroHD HD400 | Ultra-Compact 2 Channel 1/4 TRS hum destroyer. Dual mono or stereo. (Identical item available) | $ 24
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| 38441 | Behringer MicroHD HD400 | Ultra-Compact 2 Channel 1/4 TRS hum destroyer. Dual mono or stereo. (Identical item available) | $ 24
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| 39359 | Behringer MicroHD HD400 | Ultra-Compact 2 Channel 1/4 TRS hum destroyer. Dual mono or stereo. (Identical item available) | $ 24
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| 42418 | Behringer Multi-Gate Pro XR4400 | 4 channel expander/gate. Balanced XLR and 1/4" in/outs. Parametric side chain eq filter (built in). Fully tested and cleaned. Light rack rash at screw holes on rack ears, #9 condition, excellent. Popular with studio and live sound. With manual. | $ 70
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| 27973 | Behringer Multiband Denoiser SNR2000 | Professional, all purpose, single ended noise reduction system with TAC dynamic filter and auto filter. | $ 140
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| 39423 | Behringer Shark DSP-100 | Feedback destroyer | $ 88
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| 39422 | Behringer Shark DSP-100 | Feedback destroyer | $ 88
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| 25981 | Burwen 1201A | Noise Reduction, 2 rack space, Modified by AP to reduce hiss very carefully without excessive high frequency loss. Works well on tape and FM signal, 4136 opamp gives slight tubaphonic veiled sound. A somewhat archaic device but still usable as a substitute Dolby decoder or to warm up the audio character of excessively bright recordings. | SOLD
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| 51201 | Burwen KLH TNE 7000 | Latest version. With AP Rev4 modifications, excellent performance! See modifications page for more details. Excellent #9 cosmetic condition. Special capacitors replacement is of no importance to improve performance of sound. The mod I do will allow use of a different 'delay, all pass; op amp and also will clearly improve audio quality during tick removal, functions and fidelity. But I don't give out that clever intellectual property, I only have engineering blue print as such it is too large to copy. call direct or provide # I will explain the details. I've modified 100+ of these and everyone now agrees with my opinion. By the way almost all of these capacitors you see are for power supply 'by pass' and in fact are not in the audio path. As the unit ages correct calibration of de click circuit is most important concern. My modification reduces the need for future recalibration. | SOLD
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| 48366 | Burwen Research KLH TNE 7000A | Transient Noise Eliminator, rack mount version. AP modified, improved LP tick reduction circuit installed, low noise spec opamp. Mint condition, #9+. | SOLD
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| 27814 | Burwin TNE-7000 | Click and Pop eliminator, excellent condition, modified - call for details
The TNE is rackmount and in like new condition, but I only sell the Audio proz modified version. (This is a highly in demand piece that usually has a waiting list) This mod makes the unit work remarkably better. The same is with the 1201A, which is in a slightly worn condition, but certainly very acceptable. This unit also has a modification. I was the chief line tech and production assistant at Burwin research and even though my modification is simple and clever, it took a year to design. I myself was desperate for a better, wider applicable performance. The unit works better with many phono preamp cartridge combinations. I do prefer Stanton and Audio Technica cartridges because these guarantee honest bandwidth and correct stereo separation which is critical to best nick pop elimination. The Stanton 680 or 681EEE or AT 311 EP or 440ML is excellent. Indeed the ART phono preamp with proper cartridge loading switches and level control will optimize the TNE performance. I am on the side of laboratory standard ideals and not audio-“phoolish”, intentionally off RIAA standard preamp designs, which can be sometimes interesting sounding, but is usually just strange equalization tricks to impress the consumer. In my opinion its best to have an out board equalization to fix the many and varied equalization “opinions” existing on the stereo-mix of the record. The TNE is $380 and the 1201A is $240. | SOLD
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| 42247 | DBX -224X-DS | Type II tape noise reduction system. LED metering. | SOLD
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| 15359 | DBX 124 | Basic DBX noise reduction system | SOLD
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| 55894 | DBX 124 Type II | Unit will do 4 channel encode or decode or 2 channel simultaneous 2 channel decode. Tested, calibrated. Unit requires minor calibration set up | $ 128
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| 52171 | DBX 150 | type 1 unit, 2 channels A + B, noise reduction in/out switches, front panel: rec/play calibration level, rear panel console: input/output, tape input/output, no rack ears! condition #9 | $ 88
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| 52167 | DBX 150 | Type I noise reduction. Two channels A/B, in/out switches, rec/play level adjustment, console in/out, tape in/out. Fully serviced and calibrated, excellent condition, rack ears included. | $ 140
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| 52170 | DBX 150 | Type I noise reduction. Two channels A/B, in/out switches, rec/play level adjustment, console in/out, tape in/out. Fully serviced and calibrated, excellent condition, but no rack ears included. | $ 96
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| 52166 | DBX 150 | Type I noise reduction. Two channels A/B, in/out switches, rec/play level adjustment, console in/out, tape in/out. Fully serviced and calibrated, excellent condition, no rack ears included. | $ 100
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| 52169 | DBX 150 | Type I noise reduction. Two channels A/B, in/out switches, rec/play level adjustment, console in/out, tape in/out. Fully serviced and calibrated, excellent condition, but no rack ears included. | $ 96
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| 52168 | DBX 150 | Type I noise reduction. Two channels A/B, in/out switches, rec/play level adjustment, console in/out, tape in/out. Fully serviced and calibrated, excellent condition, includes rack ears. | $ 140
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| 52172 | DBX 150x | type 1 unit, 2 channels A & B, noise reduction in/out switches, front panel: rec/play calibration level, rear panel: console input/output, tape input/output, no rack ears, scratches on top cover, condition #8 | $ 68
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| 53319 | DBX 150X | (1 in stock) Low use, mint condition. No rack mount ears. In original boxes! #9 Condition. | $ 280
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| 52173 | DBX 150x | type 1 unit, 2 channels A+B, noise reduction in/out switches, front panel: rec/play calibration, level adjustment, rear panel: console input/output tape input/output, no rack ears, condition #9 | $ 68
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| 52074 | DBX 150x | Type I noise reduction. Inputs: To/From Console, To/From Tape Rec. Switchable voltage 120/240. Front Panel: Calibration level, Rec/Play. Channel A+B In/Out switches for Rec/Play. No Rack Ears. 9/10 Condition. | $ 88
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| 52896 | DBX 150X | half rack unit, phone in/out, 2 channel encode & decode, no rack ears, unit has a worn face, used as a rental unit, serviced and calibrated, condition 7+ | $ 66
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| 52075 | DBX 150x pair | Type I noise reduction. Includes two rack ears with center bridge and butterfly clamp. Excellent condition. | $ 240
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| 52073 | DBX 150x pair | Type I noise reduction. Includes two rack ears with center bridge and butterfly clamp. Excellent condition. | $ 240
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| 52057 | DBX 150x pair | Type I noise reduction. Includes two rack ears with center bridge and butterfly clamp. Excellent condition. | $ 240
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| 52076 | DBX 150x pair | Type I noise reduction. Includes two rack ears with center bridge and butterfly clamp. Excellent condition. | $ 240
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| 17825 | DBX 154 | Noise reduction system, 2 rack space, 4ch, all RCA in/outs. No rack hardware included. | SOLD
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| 17824 | DBX 155 | Decliner Noise Reduction, 2 Rack Space, input level matching, RCA Jacks, 2 channel, simultaneous encode/decode | SOLD
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| 38484 | DBX 157 | 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
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| 25466 | DBX 158 | 8-channel Noise reduction System! w/ 5x410 and 4x411 | $ 340
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| 22598 | DBX 158 | 8-channel Noise reduction System! Has 8 DBX 410 cards. Mint condition. | $ 360
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| 50904 | DBX 163x and 463x | Compressor and noise gate pair mounted together in rack. Very good #8+ condition with many tiny minor scratches on ears and face. | $ 200
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| 16489 | DBX 172 | 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
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| 52723 | DBX 180 | intact but needs repair, selling for parts or a rebuild | Contact Us |
| 51899 | DBX 180 | 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
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| 44579 | DBX 200 | Program route selector. Three selectable tape monitor loops, three selectable processor loops, noise reduction in/out. RCA ins/outs. Very good #8 condition with some minor scratches on top of unit. No rack ears included, but they are available. Professionally cleaned, serviced, and tested by AP. | $ 110
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| 25465 | DBX 208 | w/10x411 Modules | Contact Us |
| 51462 | DBX 208 Rack | With 9 units of 411 cards. #9 Condition. Not serviced. | Call Us |
| 55059 | DBX 224 | Dbx 224 Later Version
-Silver Trim with anodized black face
-120 VAC
-#9 All cleaned and calibrated | $ 140
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| 41210 | DBX 224 | Later version. Stereo type II tape noise reduction, 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. With silver rack ears(with obvious wear). Cannot be converted to 220v. Like new cosmetic condition #9 | $ 168
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| 55058 | DBX 224 | Later version, silver trim on anodized black face. No rack ears. 120 VAC operation, all cleaned, calibrated. Unit appears to have virtually no use time. 9 condition. | $ 160
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| 44250 | DBX 224 Type II | RCA inputs and outputs to and from Preamp and to and from Tape recorder. Good #7 condition with some obvious wear and scratches but still acceptable with wood side panels intact. Perfectly calibrated and functioning; tracks very well between channels. | $ 120
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| 47486 | DBX 224 Type II | Recording Technology Series. Simultaneous encode/decode, RCA ins/outs, level adjustment control for record, play (tape) and play (disc). Rack ears included. Excellent condition, cleaned and fully serviced. | $ 120
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| 45910 | DBX 224X-DS Type II | Single space rackmount stereo tape noise reduction system. Has switching and jacks for two tape decks, including bypass and dubbing. Record and play level controls. Unbalanced and RCA phono connectors. Serviced, cleaned, and tested OK (rack ears added), in mint condition with original box and packing. | $ 220
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| 28044 | DBX 228 Dynamic range expander. | One space rack mount. Unit performs disc encode as well as tape encode/decode. | $ 200
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| 16100 | DBX 263A | De-Esser with rack ears | SOLD
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| 53303 | DBX 410 | For 900 series racks. #9 Condition. Tested, calibrated. | Call Us |
| 17830 | DBX 463X | Noise Gate. Box, Packing, Manual. 1/2 Rack Space. Accessory pack. | SOLD
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| 44317 | DBX 463X | Noise floor unlimiter style gate (forces noise floor down and expands away from noise floor). Very usable for Home and/or studio use with very basic threshold and level. Like new, in original box and packing. No rack kit. | $ 100
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| 44323 | DBX 463x | Noise floor unlimiter style gate (forces noise floor down and expands away from noise floor). Very usable for Home and/or studio use with very basic threshold and level. One time demo unit but still like new, in original box and packing. No rack kit included. | $ 100
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| 46171 | DBX 463x | Noise floor unlimiter style noise gate, forces noise floor down and expands away from noise floor. Basic threshold and level controls. Very good #8 condition. | $ 80
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| 12799 | DBX 563 | Single channel noise reduction system with excellent high frequency dynamic filter for hiss reduction. Modified by AP for better noise filter. **New Low Price!** | $ 88
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| 17876 | DBX 563X | Noise reduction - bypass, gain trim, hi-2 input 1/4", in/hi-low out 1/4", stereo strapping 1/4" w/manual | $ 68
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| 44324 | DBX 563X | Noise reduction and dynamic filter. Bypass, gain trim, high impedence input. In/hi-low out 1/4". Stereo strapping capable. No accesory kit included. New stock, great condition. | $ 88
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| 53365 | DBX 900 Series | Rack unit, equipped 8 DBX411 units. Equipped with 8 DBX41 units. 8 RCA Rec i/o. 8 RCA rec i/o. -3 RU. 7+ Condition, all modules tested and calibrated QC'd. Needs TLC upon purchase. | Call Us |
| 53364 | DBX 941 | For 900 series racks. Type II noise reduction. 2 Channel encode. #9 Condition. | Call Us |
| 51546 | DBX Daki | Noise reduction for excellent play back. Stereo. HUUSES DBX Parts 146742, (4 146732. #9 condition. | $ 88
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| 8130 | DBX DUAL 155 | 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
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| 47112 | DBX II | Dynamic range enhancer and noise reduction system. Compress/expand/pre/post controls, Record/bypass/play for noise reduction, tape/disc selection, play level matching, lever/threshold controls. Professionally cleaned, serviced, tested. | $ 210
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| 49633 | DBX II 122 | Silver face noise reduction system with record, bypass, play buttons, play level match control, and tape and disc play modes. Excellent condition, cleaned, serviced, and calibrated by AP. This unit could be purchased just to have replacement VCA cards! | $ 120
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| 28047 | DBX II 128 | Compressor, Dynamic Range Enhancer, Noise Reduction system. Front panel features: Above threshold/linear switch, level adjust, compress/expand ratio control, pre/post enhance, rec/play/bypass selection, tape/DBX disc selection, play level match control. Unit designed for cassette or reel to reel. Excellent cosmetic condition. Completely cleaned, serviced, and calibrated. | Contact Us |
| 44924 | DBX NX-40 | Two channels, with RCA in/out. #8 condition with some wear to top cover, but very good mechanics and faceplate cosmetics. Fully cleaned, serviced, and calibrated. | $ 66
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| 55061 | DBX NX-40 | 2 channel encode decode. DBX 224 Type noise reduction. In 1/2 box design, very compact. All cleaned, calibrated. 9 condition. | $ 120
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| 3162 | DBX RX9 | TEAC Noise reduction, needs relays and work on circuit board which we do here. If you are having trouble finding parts enter the name into search bar | $ 200
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| 28582 | DOD FX-30B | Excellent condition, works as noise gate - effectls loop. Release, gate sensitivity controls. | $ 30
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| 17845 | Fisher NR-500 | Noise Reduction Adaptor, MPX Filter, Super D, L&R rec, play levels, led display, all phono, 1 rack space but no rack ears, box packaging manual | $ 150
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| 27755 | Fisher NR-500 | Dolby D super NR similar to Dolby B but further reduces noise hiss, best to set play level calibration very high to overcum low level signals which may be excessively nose reduced. Can be used as Aphex type presence enhancer, excellent 2 channel calibration (made originally for Nakamichi and JVC). | $ 160
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| 27005 | Furman QN-4A | 1/4" phone in/out/key. No xlr. Ground lift switch. Threshold release depth controls. 4 channels. 1 space chassis w/rack mount. Power supply ruggedized by Audio Proz. Serviced, cleaned, and QC'd OK. | $ 110
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| 42107 | Hush Systems IICX Noise Reduciton System | Hush (Rocktron) Systems 2 channel unit, each channel has 1/4 inch ins and outs, Threshold, and Sensitivity controls, excellent machine in perfect condition, includes operating manual and power supply | $ 125
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| 27737 | ISO-MAX CI-2RR | hum eliminator for consumer audio/video systems, computer soundbars, or auto audio. IHF/RCA in/outs. | SOLD
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| 43303 | KLH Burwen Research DNF-1201A Faceplate | Faceplate for KLH Burwen Research DNF-1201A Dynamic Noise Filter. Rack mountable. #8+ condition with minimal rack rash, very minor wear, and all lettering perfect. | $ 20
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| 24375 | KLH TNE-7000A | Transient noise eliminator, AKA click and pop reduction, 2 space rack mount, RCA ins/outs, PS modification plus update TL075 opamp into audio circuits, weld to ground transformer mod - call for details
Most people know the SAE5000 noise reduction system. The SAE works well on obvious pops and clicks, and is certainly acceptable for most users. But the TNE7000 is simply a superior device, adjustable for a wide range of records and cartridge types. The device operates on the concept of the click pulse being out of phase between the left and right channels as well as the wide frequency response. The best performance is realized when phono cartridges have excellent stereo separation and transient response. Ironically, many supposed audiophile cartridges are not technically accurate or actually have truly correct channel separation, especially the Ortofon moving coil designs and most conical cartridge stylus designs. The best are Audio Technica, Stanton, and older Shures, with elliptical stylus and honest 40dB channel separation. My modified TNE7000 is even better, with less obvious click removal and more range of control to remove finer nicks and ticks without overreacting to program material. I spent about six months in research designing this upgrade. | SOLD
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| 24728 | Phase Linear 1000 | Correlator noise reduction, downward noise expander, dynamic enhancer, variable high frequency noise filter - Major modifications and Phase Linear recommendations for improved noise floor/humm hiss, improved accuracy of filters, general performance/distortion. Unit in wooden cabinet - call for details. | $ 260
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| 24732 | Phase Linear Model 1000 "Autocorrelator" | Engineering sample. Downward noise expander/dynamic enhancer and variable high frequency noise filter. Switches on face plate are always wired on now, such that switching out of noise reduction creates a different filter character. Tape monitor does not work. We made major improvements on the audio design as well as some Phase Linear recommendations. Improved noise floor/hum/hiss, improved accuracy of filters, improved general performance/distortion etc. In handsome wooden cabinet. | $ 260
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| 42380 | Presonus GTX44 | 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
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| 15166 | Rocktron Hush 11X | Single ended noise reduction, 1/2 rack space, very popular device to quiet guitars or bass/keyboards | $ 85
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| 45192 | Rocktron Hush IIX | Single ended noise reduction. Half rack space. Excellent #9 condition. | $ 80
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| 47489 | Rocktron System One 180 | 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
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| 40396 | SAE 5000 | Nick and Pop reducer. Modified Power Supply, Modified high gain for nick pop removal.Careful adjustments have been made to allow this machine to remove 50% of nicks. | $ 220
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| 24024 | Sony NR-500 | Silver Face, Practically mint condition Dolby C noise reduction | SOLD
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Units
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| 14218 | Symetrix 511 | Noise reduction system, 1 rack space, 2 channel noise filter, XLR in outs phone in/out. Used as AP engineering sample. | Contact Us |
| 23052 | Symetrix 511A | Modified w/ ground lift switch. Excellent Cosmetic Condition! | $ 280
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| 55365 | Tascam DX-40 | 4 channel DBX with rack ears. Cleaned, and Tested. | $ 220
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| 55359 | Tascam DX-40 | 4 channel DBX with rack ears. Cleaned, tested, minor cover scratches. 8+ condition | $ 220
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| 27286 | Tascam DX-4D | DBX Noise Reduction ,4 ch, 16 RCA phono jacks on rear, 4 each (input, output, encode out, encode in) cleaned all OK. Unit in good condition, slight cosmetic damage on top panel.
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| 27361 | Tascam DX-4D | DBX Noise Reduction unit in excellent condition. 4 ch, 16 RCA phono jacks on rear, 4 each (input, output, encode out, encode in). Completely cleaned, calibrated, and inspected. (2 units available in identical condition) | $ 200
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| 27287 | Tascam DX-4D | 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
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| 43745 | Tascam DX-4D | 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. | $ 200
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| 17434 | Teac DX-8 | Noise reduction module, accessory for 80-8 tape recorder, bag, manual, 16 RCA cables, no warranty card. Known to be in good condition. This unit is priced on request depending on service required. $250 (Tested appears to work, minimal repair, clean up time is spent) - $400+ range (Full restoration everything repaired, all relays cleaned (there are 16 of them!!) tested, calibrated, etc.) These are 30 years old, it’s almost a requirement to really perfect. Once serviced correctly these are very reliable and great performing machines. We also do a modification in the circuit which reduces the circuit noise another 4 to 6 db and also reduces the crosstalk, simulsync, playback at high frequency by almost 10 db. A significant improvement. $160 for the modification. | SOLD
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Units
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| 24983 | Teac AN-80 | Classic Mid 70's teac noise redux w/dolby, hooks up between tape deck and receiver/preamp, super spec calibration, excellent fidelity | SOLD
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Noise Reduction