ADC Sound Shaper SS-110 (1970s–1980s)

A plain 10-band graphic EQ that sat in a lot of living rooms and got used on rock, funk, and disco at full volume.

Overview

The ADC Sound Shaper SS-110 has no chrome and no blinking lights. It has twin rows of faders, and the action on them is still smooth after decades of use. It comes from the golden age of home audio tweaking, when "flat response" was for purists and everyone else wanted the kick drum to punch through the drywall. The signal path is discrete and surprisingly clean. It was never meant to win audiophile awards. It was built to survive basement parties, college dorms, and the occasional smoke session where someone cranked the 60 Hz slider all the way up "just to see what happens."

The SS-110 is sonically transparent for its price. Later IC-based equalizers could color or compress the signal when pushed. This one uses discrete bipolar amplifiers with LCR (inductor-capacitor-resistor) filters in the feedback loop. That is old-school analog design, and it keeps headroom and avoids the "sag" some graphics develop when multiple bands are boosted. The tone stays firm even when you sculpt aggressively. It won't add warmth like a tube preamp or give you the surgical precision of a parametric. It gives you control and clarity, and the sliders feel good to move.

The SS-110 sat below ADC's pro-oriented Mark II revisions and flagship studio units. It was the accessible entry point into the brand's "Sound Shaper" line. It had no stepped attenuators and no balanced outputs. But it brought real equalization power to the consumer market at a time when most "tone controls" were crude shelving filters. For under $100 new, you got 20 individual faders (10 per channel) and smooth ±12 dB adjustment. Each slider moves with a firm, slightly damped glide, which turned EQing into something closer to a performance than a setup step.

Specifications

Manufacturer	ADC Sound (Audio Dynamics Corporation)
Production Years	Mid-1970s to early 1980s
Original Price	$89.95 (USD)
Equalization Type	10-band stereo graphic equalizer
Frequency Bands	32 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz
Boost/Cut Range	±12 dB per band
Signal Path	Discrete bipolar amplifier design
Filter Type	LCR (inductor-capacitor-resistor) in feedback loop
Inputs	2 × RCA (stereo)
Outputs	2 × RCA (stereo)
Throughput Bypass	Mechanical toggle switch (non-defeatable in some units)
Power Supply	Internal AC transformer, 120V AC (North American models)
Power Consumption	15 watts
THD	Less than 0.05% at full output (typical)
Frequency Response	20 Hz – 20 kHz (±0.5 dB, flat setting)
S/N Ratio	Greater than 90 dB (A-weighted)
Input Sensitivity	250 mV for rated output
Output Level	2 V RMS maximum
Dimensions	17" W × 5" H × 6.5" D
Weight	6.8 lbs (3.1 kg)

Key Features

The Discrete Advantage

Many of its contemporaries moved to op-amps and integrated circuits to cut costs. The SS-110 kept a fully discrete signal path for the audio circuitry, and that paid off in headroom and transparency. Discrete bipolar transistors in the gain stages, plus precision LCR filters, let the unit handle dynamic program material without flinching. Owners report noticeably cleaner performance with complex signals like full-bandwidth rock mixes or live jazz recordings. The EQ doesn't "disappear" like modern digital units, but it avoids the wooliness of cheaper graphics from the late '70s. Even with multiple bands boosted, the signal stays articulate.

Tactile, No-Nonsense Interface

The faders on the SS-110 move with a deliberate, mechanical feel. Unlike the flimsy plastic sliders on budget EQs, these are metal-shafted and glide on internal rails that, when clean, give smooth resistance without wobble. The layout is simple: two parallel rows of sliders, left and right channels mirrored, with frequency labels etched directly into the brushed aluminum faceplate. There is no digital display and no memory presets. You get twenty points of control. The bypass switch is a basic but sturdy rocker that clicks with authority. Some early units lack true relay bypass, so the signal still passes through the circuit even when "defeated," which can degrade the chain slightly when the EQ is not in use.

Built for the Real World

ADC didn't style the SS-110 like studio gear, but they built it like it belonged in one. The steel chassis is thick, and the rear panel is densely populated with sturdy RCA jacks. The internal layout is neatly routed, with no spaghetti wiring. The internal power transformer is potted to reduce microphonics, and the circuit boards are hand-soldered with consistent joints. It's not military-grade, but it's overbuilt by consumer standards. That explains why so many still work after decades of being shoved behind racks, knocked over, or run on questionable power.

Historical Context

The mid-1970s saw a surge in home audio customization, driven by high-fidelity component systems and a taste for bass-heavy music, from Motown to Zeppelin to disco. Graphic equalizers, once limited to broadcast and recording studios, started trickling down to living rooms. ADC, short for Audio Dynamics Corporation, was one of several American companies, alongside BSR, Radio Shack, and Fisher, going after that market. Others cut corners with IC-based designs or flimsy enclosures. ADC went with solid engineering and a middle ground between affordability and performance.

The SS-110 arrived just before the EQ craze peaked. It landed between the ultra-cheap no-name units and the $300+ professional models from companies like Rane or API. It competed directly with the Realistic SA-5000, the BSR X1000, and the Fisher EQ-900, which often used cheaper filter designs and suffered from higher distortion. ADC's discrete circuitry and LCR filters gave it a technical edge, even if the brand lacked the prestige of a Marantz or Sansui. It wasn't sold with flashy ads or celebrity endorsements. It went through audio specialty shops and mail-order catalogs to people who read the specs and cared about signal integrity.

By the early 1980s, the graphic EQ boom began to wane. Audiophiles dismissed them as "tone benders," and the rise of digital audio shifted focus to other forms of processing. ADC responded with the Mark II revision of the SS-110, which added features like stepped controls and improved metering. The original SS-110 remained the most widely distributed model. It never became a legend, but plenty of them have been pulled from attics, reconditioned, and plugged into modern systems.

Collectibility & Value

The ADC Sound Shaper SS-110 is not rare, but a functional, clean unit is increasingly hard to find. Most surface from basements or estate sales, often with oxidized faders, cracked knobs, or failing power supplies. Non-working units or parts donors sell for $25 - $50. Tested, fully operational models in good cosmetic condition typically fetch $80 - $150. Units with original boxes, manuals, or the less common Mark II designation can reach $200, especially if listed as "collector clean."

The most common failure points are mechanical, not electrical. Fader pots accumulate dust and get scratchy, particularly in the bass and treble bands that see the most use. Contact cleaner often restores function, but some sliders may need disassembly or replacement. The RCA jacks are sturdy, but they can loosen over time and need resoldering. The internal power transformer is generally reliable, but units stored in damp environments may show corrosion on the secondary windings.

Before buying, test every fader for smooth travel and listen for crackling or dropouts. Check that the bypass switch engages cleanly and that both channels pass signal equally. Look over the faceplate for missing slider caps, which are common on the rightmost faders, especially the 16 kHz band. Make sure the unit powers on without hum or distortion. Recapping isn't usually urgent unless the unit has been unused for 20+ years, but replacing the electrolytics can improve long-term reliability and reduce noise floor.

The SS-110 is not a high-end collectible like a vintage Neve or API. It has a loyal following among DIY audio tinkerers and analog enthusiasts who like its build quality and hands-on EQ.