Onkyo Integra E-707 (1983)
The Integra E-707 was Onkyo's top-of-the-line graphic equalizer from 1983. It was introduced at ¥54,800. It's a 12-element analog equalizer covering 16 Hz to 32 kHz in twelve bands per channel, with a variable range switchable between ±12 dB and ±6 dB. The front panel is built around a calibration aid: a built-in test-tone oscillator (32 Hz to 16 kHz) that works with illuminated level-control knobs. Press the Spot button and a 32 Hz tone plays while the matching knob lights up. Each press after that steps up an octave and moves the light. Sweep mode runs the tone automatically across the range while the knob lights track along, so you can check the overall curve after adjustment.
On paper it's a solid performer. Frequency response is 10 Hz to 35 kHz ±0.5 dB, THD is 0.01% or less, signal-to-noise ratio is 100 dB, and max input is 5 V. Input impedance is 50 kΩ and output impedance is 600 Ω. Onkyo's "super turbo" power supply design and a two-stage delta turbo circuit/filter were meant to keep modulation noise from the transformer and external AC-line noise out of the audio path.
The E-707 has a few useful touches beyond the usual sliders. A display switch hides one channel's knobs so you can see just the other channel's curve. The level controls include a feature that automatically smooths the transition between adjacent bands as you move a slider. An output selector allows after-monitoring of a signal being recorded through the equalizer when used with a 3-head deck. The unit draws 17W, has one unswitched AC outlet (200W), and weighs 4.5 kg at 435 mm wide.
Documentation on the E-707 is thin beyond the Japanese spec sheet sources. No substantial period reviews have surfaced in English, and little is recorded about its market context or production run. A single Russian reseller listing describes it as the top model in its line, in excellent technical and cosmetic condition, asking 35,000 ₽.
Similar items on eBay
No exact Onkyo Integra E-707 listings are live right now — these searches show current Onkyo and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.