ADC Sound Shaper One Ten (1970s–1980s)

A sleeper hit from the golden age of tweakable hi-fi. This unassuming box packed real inductors and discrete transistors, and it has a cult following that still argues whether it's magic or junk.

Overview

Flick the power switch on an ADC Sound Shaper One Ten and you might not hear much. There's a faint click, maybe a soft hum if it hasn't been recapped in thirty years. Slide one of those chunky toggles up or down and the system starts talking back. The 60Hz band thumps like a subwoofer waking up. Pull down 3.5kHz and the ice-pick sibilance of a worn vinyl pressing melts away. This isn't the smooth, digital curve of a modern EQ. It's surgical, tactile, and a little raw. For a brief window in the late '70s and early '80s, that's what audiophiles wanted: control. Real knobs, real circuits, and real consequences when you overcooked it.

Built by Audio Development Company (ADC), a name better known for high-end phono cartridges like the XLM series, the Sound Shaper One Ten (also known as the SS-110) wasn't trying to win beauty contests. It looked like a Radio Shack special, which, in a way, it was. ADC manufactured these under contract for Tandy Electronics, so you could walk into a mall kiosk in 1982 and walk out with one tucked under your arm next to a cassette deck and a pack of Maxell XL-IIs. The styling is utilitarian, but inside it used discrete transistor circuitry and, more surprisingly, actual inductors in the filter stages. You'd expect those in high-end parametric EQs, not mass-market graphic equalizers. That inductor-based design gave it a reputation among some vintage gear hunters as a "sleeper unit," a hidden gem buried under decades of dust in basement audio racks.

The One Ten offered ten bands per channel, double the five-band version called the Sound Shaper One (or One-IC). Center frequencies were 60Hz, 120Hz, 240Hz, 500Hz, 1kHz, 2kHz, 3.5kHz, 5kHz, 7kHz, and 10kHz. Each slider gave ±12dB of boost or cut, which was serious tonal sculpting power at a time when most home receivers still relied on basic bass and treble controls. It was marketed for room correction, speaker matching, and vinyl de-essing. In practice, it became a toy. Crank the 2kHz and 3.5kHz bands and your Fleetwood Mac record sounds like it was recorded in a tin can. Drop the lows and highs and you've got AM radio simulation mode. It was fun, sometimes too much so.

The One Ten wasn't for everyone. It added a noticeable layer of coloration even with all sliders flat. Some describe it as a slight veil, others as a warm bloom. Noise performance was decent for its era but not exceptional. Owners report a low-level hiss that becomes apparent on sensitive speakers or high-gain systems, especially in units that haven't been serviced. Like most electronics of its vintage, it has aged badly in the electrolytic capacitors. A neglected unit can hum, crackle, or worse, leak DC into your preamp. When it's working right, it's transparent enough to be useful and characterful enough to be interesting.

Specifications

Key Features

Inductor-Based EQ Filters – Analog Guts in a Plastic Case

Most budget graphic equalizers of the era relied on passive RC (resistor-capacitor) networks or op-amp-based active filters. The Sound Shaper One Ten used inductors in its EQ stages, which was a rarity for consumer-grade gear. Inductors can offer sharper filter slopes and lower phase distortion than RC designs, but they're bulkier, more expensive, and prone to picking up electromagnetic interference if not shielded properly. In the One Ten, they're tucked beneath the PCB, wrapped in metal cans or ferrite beads to minimize crosstalk. This design choice likely stemmed from ADC's background in high-fidelity transducer engineering, where precision mattered. The EQ shapes tone with a subtle weightiness, especially in the lower midrange. It's not "hi-fi" by modern standards, but it's more alive than the sterile digital EQs that would dominate a decade later.

Ten-Band Surgical Control – Before Room Correction Apps, There Was This

Ten bands may sound modest now, but in the late '70s it was borderline overkill. Most home systems made do with tone controls or five-band EQs. The One Ten's frequency selection wasn't arbitrary, because it targeted known problem areas. The 60Hz and 120Hz bands could tame boomy room modes. The 240Hz and 500Hz sliders helped dial out boxiness in the lower midrange. The 3.5kHz and 5kHz bands were good for taming sibilance or harshness in aging tweeters. The 10kHz control let you add air or reduce tape hiss. Each channel was independently adjustable, so you could compensate for speaker placement asymmetry, say one monitor closer to a wall than the other. It wasn't perfect calibration, but for pre-digital audiophiles it was the closest thing to professional-grade room tuning they could afford.

Mark II Update – Lights That Actually Work

The Mark II version of the One Ten added illuminated slider buttons, a small upgrade for dimly lit listening rooms. Service technicians also observe that the Mark II revisions included minor circuit refinements that improved long-term reliability, though the core topology remained unchanged. The illuminated switches introduced another point of failure: the tiny bulbs can burn out, and replacing them requires disassembling the front panel. Collectors note that fully functional Mk IIs with working lights are becoming rarer, and some restorers now retrofit LEDs for longevity. The Mk II also came in both black and silver faceplates, with black units often associated with later production runs.

Historical Context

The ADC Sound Shaper One Ten emerged during the peak of the home hi-fi boom, when stereo systems were no longer luxury items but living room fixtures. Brands like Pioneer, Sony, and Sansui were pushing higher power outputs and flashier designs, but many listeners still struggled with real-world acoustics like carpeted rooms, bookshelves, and mismatched speakers. The graphic equalizer became a popular accessory, promising to "fix" bad sound. Radio Shack's Realistic brand dominated this market with affordable, mass-produced units, but serious audiophiles often dismissed them as sonically compromised. ADC, already respected for its phono cartridges, brought a step up in build quality and circuit design. Though the One Ten was sold under the Tandy umbrella, it wasn't a mere badge job. It reflected ADC's engineering ethos, even if packaged for the mall crowd.

Competitors included the Fisher EQ-770, the Sony STR-EQ1, and the KLH Model Twelve, all offering similar band counts but often using cheaper op-amp-based circuits. The One Ten's discrete transistors and inductors put it in a different class technically, even if its plastic case and generic labeling didn't scream "premium." It also arrived just before the digital revolution in audio processing. Within a few years, microprocessor-controlled EQs with memory presets would make manual sliders seem quaint.

Collectibility & Value

Today, the ADC Sound Shaper One Ten occupies a curious niche: too obscure for mainstream collectors, too interesting for complete dismissal. Untested or as-is units sell on eBay for $25 to $50, which is cheap enough for tinkerers and modders. Fully functional, cleaned, and recapped models go for $100 to $150, with some boutique resellers like Holt Hill Audio listing them at $129 with servicing included. The Mark II, especially in black with working lights, can command a slight premium, but not dramatically so.

The biggest threat to longevity is capacitor failure. The electrolytic caps in the power supply and signal path degrade over time, leading to hum, channel imbalance, or complete failure. Service technicians observe that many units arriving for repair have at least one leaky cap, and some require full recap jobs. Transistor failure is less common but not unheard of. Documentation shows that six specific transistors in the Mk II are prone to drift or shorting, especially if the unit was left powered on for extended periods. A fully restored One Ten with replaced caps and transistors will be significantly quieter and more reliable, but the cost of restoration can approach or exceed the resale value.

Before buying, check for smooth slider action. Grittiness suggests dried lubricant or dirty contacts, fixable with DeOxit but time-consuming. Test all sliders for crackling, especially around the midrange frequencies. Verify that the power LED (on Mk II) lights up and that there's no burning smell or visible leakage. If possible, listen to it in a system. With all sliders flat, it should add minimal coloration. If it sounds dull or muffled, the caps are likely gone. The inductors are a selling point, but they can be microphonic if disturbed, so tap the chassis lightly and listen for thumps through the speakers.

Opinions are polarized. Gearspace threads have users calling it both a "cool inductor-based EQ" and a "worthless piece of shit." The One Ten has quietly gained a following among vintage synth and tape-loop enthusiasts who appreciate its hands-on character. It's not transparent, and it's not supposed to be. It's a tone shaper, not a correction tool.

eBay Listings

ADC Sound Shaper One Ten MK II Graphic Equalizer SS-110 Mark

$99.95

ADC Sound Shaper One Ten 1 10 Stereo Equalizer SS-110-IC

$100

ADC Sound Shaper One Ten-IC Graphic Equalizer 10 Band Tested

$125

ADC Sound Shaper One Ten MK II Graphic Equalizer EQ Stereo S

$150

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