ADC SS-110 (1979–1980s)

A 10-band EQ with twin rows of sliding faders, one for each channel.

Overview

The ADC SS-110, branded the "Sound Shaper One Ten," was built for people who didn't want flat response. They wanted to sculpt it. It came out in the late '70s and carried into the early '80s, right when audiophiles were starting to question whether neutrality was the only path to sonic truth. You get ±12 dB of cut and boost across ten bands, with left and right channels adjustable independently. Fix your room, your speakers, your regrets.

It isn't a preamp or a processor. It's surgical gear in a consumer audio case. The bands are 31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16kHz, and they cover the full audible spectrum with a spacing that feels intuitive once your hands are on the faders. You can tame a boomy floor-standing speaker in a corner, lift vocals forward without sharpening cymbals, or give an old tube amp some help with bass. The signal path is fully passive (with active buffering), so it doesn't color the sound when all sliders are flat. No tonal shifts, no added haze.

ADC, or Audio Dynamics Corporation, wasn't one of the big names like Pioneer or Sony, but it carved a niche with gear that felt more serious than the average rack unit. The SS-110 sits in the middle of the Sound Shaper line, above the entry-level SS-10 with fewer bands and below the rare, spectrum-analyzer-equipped SS-315. Owners report it showing up in semi-pro studios, high-end home setups, and even some mobile DJ rigs where tonal shaping on the fly was non-negotiable.

It's not flawless. The build is solid but not overbuilt - Taiwanese manufacture, not Japanese precision - and the sliders, while smooth when clean, can develop scratchiness over decades of use. There's no overload protection, no clipping indicators, no muting on power-up. The sound is clean, transparent, and dynamically honest, with no flabby lows or smeared highs, even when you're boosting aggressively.

Specifications

Manufacturer	ADC (Audio Dynamics Corporation)
Production Years	1979–1980s
Model Name	SS-110 Sound Shaper One Ten
Country of Manufacture	Taiwan
Number of Bands	10 per channel
Frequency Bands	31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz
Adjustment Range	±12 dB per band
Channel Configuration	Stereo (independent left/right control)
Input Type	Stereo RCA
Output Type	Stereo RCA
Signal Path	Passive EQ with active buffering
Power Consumption	110 W
Dimensions	15 x 7¾ x 6 inches
Weight	Approx. 15 lbs (6.8 kg)
Front Panel	Brushed black steel with sliding faders
Color	Black
Model Variants	SS-110, SS-110 Mark II, SS-110 IC
Original Box	Yes (commonly reported with original packaging)

Key Features

Independent Stereo Channel Control

Most graphic EQs of this era treated stereo as a mirrored affair - move the 1kHz fader on the left, and the right follows. The SS-110 doesn't. Each channel's ten bands are fully independent, so you can correct for room asymmetry, mismatched speaker aging, or different input sources feeding each side. This was rare in consumer-grade units and pointed at its semi-pro aspirations. You can fix a bass null on the right without touching the left, or brighten a dull right tweeter without making the left side harsh.

Passive EQ with Active Buffering

The signal shaping happens in a passive filter network, which avoids the coloration and distortion that active EQ stages can introduce. But passive designs usually suffer from insertion loss and poor drive capability. ADC solved this with discrete transistor-based buffering on both input and output stages. The result is an EQ that doesn't degrade dynamics or transient response, even when multiple bands are cranked. Service technicians observe that the buffer transistors are the most common failure point after decades of use, especially if the unit was left powered on for long stretches.

Mark II and IC Revisions

The SS-110 evolved into the Mark II and later the IC version, which integrated newer op-amps and improved power regulation. The Mark II, dated as early as 1979, tightened up the high-frequency response and reduced crosstalk between channels. The IC variant replaced discrete buffering with integrated circuits, reducing maintenance needs but slightly altering the "feel" of the signal path. Some owners report a smoother top end, others miss the discrete grit. None of the changes were revolutionary.

Historical Context

In the late 1970s people stopped accepting that their speakers and rooms were beyond fixing. The rise of direct-drive turntables, better cartridges, and high-compliance amps meant systems were revealing more flaws than ever. The graphic equalizer came in as a correction tool. ADC entered this space with the Sound Shaper line at a time when competition included the Pioneer EQ-63, the Sony STR-E885's built-in EQ, and the professional-grade API 5500. The SS-110 wasn't trying to beat API in a studio, but it offered 80% of the control at 20% of the price.

It arrived just before the digital EQ boom of the mid-80s, which brought microprocessors and presets but often at the cost of transparency. The SS-110 stayed analog, with adjustment that was immediate, tactile, and free of menus. Its dual rows of faders looked like a miniature mixing console on your rack. Brands like Realistic sold EQs as accessories, while ADC sold the SS-110 as a system cornerstone.

The built-in spectrum analyzer mentioned in some forum posts likely refers to the SS-315, a rarer sibling with real-time analysis displays. The SS-110 lacks that feature. It has no flashing lights and no auto-set, just a clean, easy layout.

Collectibility & Value

Today, the SS-110 trades in a narrow market. Prices vary wildly based on condition, version, and whether the unit has been serviced. Untested or "for parts" units on eBay often list between $50 and $150, but these are gambles. Decades-old capacitors in the power supply and buffer stages can fail silently, causing hum, noise, or complete channel dropouts. A freshly recapped and cleaned Mark II in working order can command $400 to $600, especially if it includes the original box and manual. The Reverb listing from 2022 showing a $1,399 price tag appears to be an outlier, possibly mispriced or bundled with rare accessories, and is not reflective of typical market value.

The most common failure points are the sliding faders, which accumulate dust and oxidation, leading to channel dropouts or scratchy audio. Cleaning with contact cleaner helps, but many sliders are worn past repair. The power supply, rated at 110W, runs hot and can stress nearby components if ventilation is poor. Collectors note that units stored in garages or damp basements often have corroded PCB traces or failing electrolytics. Before buying, insist on audio demos or at least a video showing all faders moving smoothly and both channels active.

It's not a "must-have" like a Nakamichi tape deck or a McIntosh amp, but for system tuners and vintage EQ enthusiasts, the SS-110 offers ten physical sliders per channel that respond instantly, with no touchscreen menu. It suits a late-'70s high-end system or a retro-modern hybrid.