Sansui RG-700 Graphic EQ & Reverb, Japan, Gorgeous LED

Sansui RG-700 Graphic Equalizer & Reverb Consolette – Made in Japan, Lights Beautifully

The Sansui RG-700 is a rare, unusually capable stereo graphic equalizer and reverb processor from Sansui’s 1980s vintage era, built in Japan during the golden age of analog audio engineering. What makes this consolette truly special is not just its technical prowess but its gorgeous multi-color LED display that illuminates the unit with a visual feast whenever power is applied—a design choice that reflects the same aesthetic philosophy that made Sansui’s vintage tuners and receivers so iconic. Beyond the display, the RG-700 combines three separate equalizers, a BBD (bucket-brigade delay) reverb circuit, mixing functions, and a defeatable “Multidimension” rotary control into one compact, forward-thinking package. This unit has been thoroughly tested and verified fully functional across all circuits; it lights up beautifully, all sliders respond smoothly, and the reverb tanks with their signature spring character deliver natural, lush spatial depth. Cosmetic condition is good with light signs of age and use.

The RG-700’s architecture is deceptively sophisticated. The main 7-band graphic equalizer allows fine-tuned frequency shaping across the spectrum (63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.3kHz, and 16kHz), each with ±12dB of control range, giving you the ability to shape everything from bass bloom to presence peaks. A separate 5-band equalizer is dedicated exclusively to the reverb circuit, allowing you to tone-shape the reverb’s character independently from the main signal—an unusual and sophisticated feature that lets you dial in anything from subtle, controlled ambience to elaborate, colored spaciousness. A third 5-band equalizer processes a secondary input source, making it possible to route two independent stereo sources through the RG-700 and blend them together using front-panel faders and mixing controls.

The reverb section uses genuine electromechanical spring tanks—the same technology found in classic Fender amps and high-end studio reverb units. The BBD circuit controls the reverb’s wet/dry mix, and the reverb’s own EQ section allows deep customization of the reverb’s tonal character, from bright and shimmery to warm and cavernous. The “Multidimension” rotary control is Sansui’s proprietary effect that adds depth and dimension to the overall soundfield—a precursor to modern spatial processing concepts, though entirely analog in execution.

Input sensitivity of 150mV and output level of 150mV make the RG-700 compatible with line-level sources (CD players, tape decks, tuners, mixing boards) without requiring additional buffering. Frequency response extends from 20Hz to 20kHz, and with a signal-to-noise ratio of 75dB and total harmonic distortion of just 0.05%, the EQ and reverb circuits are transparent and clean enough to use on high-resolution audio without audible degradation. Channel separation of 60dB ensures stereo imaging remains pristine.

The front panel is a delight: compact layout with dual-slider sets for each of the three equalizers, illuminated toggle switches, a fader for reverb wet/dry mixing, and mixing faders for blending two input sources. The multi-color LED display glows steadily when powered, creating an understated but unmistakably retro visual signature. The rear panel includes adjustable gain control for fine-tuning input levels and, notably, a voltage selector switch that allows operation with 120V, 220V, or 240V AC power—a thoughtful touch that reflects the RG-700’s international design brief and makes it compatible with studio installations worldwide.

Build quality is quintessentially Sansui: solid aluminum chassis, clean internal layout, and components selected for longevity and reliability. At just 2.8kg (6.2 lbs), it’s remarkably lightweight yet feels substantial and well-engineered.

Key Features & Specifications

Stereo graphic equalizer and reverb processor consolette

Made in Japan (1980s)

Main 7-band graphic equalizer: 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.3kHz, 16kHz (±12dB range per band)

Dedicated 5-band reverb equalizer for independent reverb tone-shaping

Secondary source 5-band equalizer for blending two input sources

Electromechanical spring tank reverb with BBD circuit control

“Multidimension” rotary control for spatial depth enhancement

Fader and mixing functions for stereo source blending

Input sensitivity: 150mV (line level)

Output level: 150mV

Frequency response: 20Hz to 20kHz

Signal-to-noise ratio: 75dB

Total harmonic distortion: 0.05%

Channel separation: 60dB

Adjustable rear-panel gain control for precise level matching

Voltage selector: 120V / 220V / 240V AC operation

Gorgeous multi-color LED display illuminates on power-up

Fully functional reverb tanks with lush, natural spring character

All sliders, controls, and circuits tested and verified working

Good cosmetic condition with light signs of age and use

Dimensions & Weight

Dimensions (Width × Height × Depth): 430 × 78 × 223 mm (16.9 × 3.1 × 8.8 inches)
Weight: 2.8 kg (6.2 lbs)

The Sansui RG-700 is a genuinely unusual and sophisticated piece of audio gear that bridges the worlds of meticulous equalization, analog spatial processing, and forward-thinking studio design. Whether used as a mastering-grade EQ for final mixes, a reverb processor for adding warmth and dimension to vinyl or tape playback, or simply as a beautiful, functional sculptural element in a vintage audio system, the RG-700 delivers both measurable transparency and unmistakable character. Its combination of three independent EQs, genuine spring reverb, and mixing capability makes it far more versatile than typical graphic equalizers of its era, while the iconic LED display and compact footprint ensure it looks at home on any shelf or in any rack. A rare and genuinely fun piece of Japanese audio engineering that invites experimentation and rewarding sonic exploration.

Backed by Radique Audio’s 90-day warranty and our perpetual trade-back policy, you can purchase with confidence.

Asking $245