Audio Proz Service and Sales


Sundholm 2100

Audio Proz Inv #: 56402

Two channel graphic equalizer. 10 bands. XLR and 1/4 inch in/outs on back. 1 rack unit size. Black face, LED -20 +10 indicators. Audiophile grade design and components. Low use, minor blemishes on top cover. Scratch on bottom. AP MOD RF supression/noise floor. 9/10 condition.

$ 280  Contact Us  

Summit EQP-200a output amp module

Audio Proz Inv #: 51880

for balanced line drive. Black color, 1" square. New.

$ 60  Contact Us  

Summit Audio EQP-200A

Audio Proz Inv #: 49814

Dual program equalizer, 2space 2channel design. Excellent condition, carefully serviced and tested, includes original operator's manual.

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Soundholm 3104

Audio Proz Inv #: 9449

Graphic EQ, tested, cleaned.

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Soundcraftsman TG3044-R

Audio Proz Inv #: 70890

Third octave twin-graphic pro model. 21 bands of equalization. Cap and tuned coil design. With 2 tape monitors. 4 space rack. IC chips uses super low noise XR. XLR and 1/4" inputs only. Will take professional level. Minor but obvious bend at bottom corner - looks OK. Condition 8+

$ 318  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.


Sony SEQ-9 Graphic EQ

Audio Proz Inv #: 27190

Single ended design transistor equalizer. Excellent operating condition, QC tested OK.

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Shure SR 107

Audio Proz Inv #: 62492

10 band (mono) Parametric EQ, single rack. Bizarre modification redesign by A.P. owner to make into 10 Harmonic Equalizer to create 2nd and 3rd harmonic enhancement XLR and 1/4 in/out. 1/4 Aux out can change the timbre of any signal. Engineering model #8 condition 

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Scott 825z 2IU Rack Handles

Audio Proz Inv #: 44597

Silver color 2iu rack handles. Very good #8 condition.

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Samsung E62

Audio Proz Inv #: 63871

Stereo graphic 1/3 octave 31-band EQ. 2 rack space unit. Excellent condition mechanical and cosmetic (like new), never rack mounted, light studio use only. All controls and switches cleaned. Super low noise 90db noise floor! Pro-grade performance, excellent parts and design, similar to Rane or 10-series DBX; this is a better offering from Samson than the current (2008) S-series. #9+ condition 

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SAE 2900 and others

Audio Proz Inv #: 54579

100k dual ganged fader used as frequency control on the 2900. 2 available, #9

$ 24  Contact Us  

SAE 2900 and others

Audio Proz Inv #: 54580

50K faded used as lo/hi frequency control in 2900. 2 available, #9 condition. $24 each.

$ 24  Contact Us  


We are presently operating on an APPOINTMENT ONLY basis. Please call us first at (617) 926-8020 to schedule an appointment before you come into the shop for repairs, rentals, product recommendations, consultations, or anything other than minor purchases.


SAE 2900

Audio Proz Inv #: 54582

Black face plate only. Excellent condition, no rack rash. Ving minor dings at edges, one tiny scratch at face. Low use, all lettering perfect. minor wear around edges, #9.

$ 28  Contact Us  

SAE 1800

Audio Proz Inv #: 42776

2 band sweep parametric EQ, 3-rack space. Excellent condition!

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SAE 1800

Audio Proz Inv #: 55358

Solid State Stereo Parametric EQ. Equalizer only. Channel A/B fader controls. Level/Frequency/Bandwidth Lo-Frequency. Level/Frequency/Bandwidth Hi-Frequency. -70 to 0db attenuator. Line in/out, EQ rec-tape-play, EQ defeat, Line out buttons. Brushed black aluminum blackface rackmount. Like new, very minor scratches/scuffs on left side of face. Low hours. 9/10 condition

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SAE 1800

Audio Proz Inv #: 70267

Stereo 2-band fully parametric sweep, 3 space rack mount design, One of the Best !, Tape monitor in (this version has very quiet OP amps), All internal board connects, Controls well reinforced soldering, Unit is low use, All controls cleaned, Unit calibrated +/-1dB over all functions, levels, channel matching, With manual, (Modifications - Improved power supply capacitors, Improved internal grounding shield at power transformer, noise floor now 4dB better) ,Condition 9+

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Rocktron EQ3

Audio Proz Inv #: 53147

Fully Parametric EQ. 3 band. Low, mid, high frequency controls. Bandwidth controls. Unbalanced I/O. Preamp, high gain. Rugged, high quality design. As good as best. From owners personal collection. -Cleaned controls and switches. With yellow level knob. #8

$ 200  Contact Us  

Realistic Stereo Parametric EQ

Audio Proz Inv #: 15964

3 band sweep EQ, stereo gain 6v battery

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


Realistic Stereo Parametric EQ

Audio Proz Inv #: 40905

3 band eq Runs on 9v supply, or AA batteries.

$ 80  Contact Us  

Realistic Stereo Frequency Equalizer 31-1989

Audio Proz Inv #: 47696

Design uses cap and coil and class A transistor for a thick, "old school" character. Power button, bypass button, EQ record button, tape monitor button. Excellent #9 condition.

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Realistic Stereo Frequency Analyzer

Audio Proz Inv #: 46897

5-band equalizer, AP updated with newer, quieter transistors and transistor class circuitry. Caps and coil equalizer. Very good #8 condition.

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Realistic Model 31-2020

Audio Proz Inv #: 70842

Dual 10 band EQ. Silver face, low profile. 2 tape monitor dubs. EQ transfer to tape. Simple image expander. Circuit very effective. This unit has very high quality controls and switches. Audio spectrum display. Dead quiet low noise. Crucial EQ circuit is very clever simple class transistor design. Uses all fairly common parts. In box. Bottom has shielding. Superb EQ design. Condition 9+

$ 218  Contact Us  

Realistic Model 31-2010 Stereo Frequency Equalizer

Audio Proz Inv #: 72111

12 band stereo frequency equalizer, silver face slim line design, 2 ¾ inches high, record EQ, 2 tape, 2 dubbing, 2 to 1 and 1 to 2 IMX stereo expander, 8+ condition, minor dent

$ 220  Contact Us  

Realistic Model 31-1986

Audio Proz Inv #: 50786

Stereo frequency EQ, main in/out, tape in/out, L/R phono. Control faders +12db to -12db for 60Hz, 240Hz, 1000Hz, 3500Hz, 10000Hz. Produces fat bass midrange equalization, modified low end EQ for fatter bass.Unit has Class A transistor circuits, uses capacitor, coil inductor circuit design similar to vintage equalizers,tube sound character. #8+ condition

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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.


Realistic 31-2010

Audio Proz Inv #: 60229

12 Band stereo Frequency equalizer. *IMX stereo expander. 2 Tape monitor channels dubbing. Well done design. Clean all controls (silver), #8+ Condition.

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Rane PE17 EQ

Audio Proz Inv #: 27764

Mono XLR in/out, 5 band sweepable EQ, 3 switchable overlappingbandwidths, VERY STABLE CIRCUIT, best quality!!

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