Surround-sound systems, soundbars, speaker selectors and miscellaneous audio components.
- Audio Control Model C-101 — 1986 – Octave Graphic EQ and Spectrum Analyzer [Clean-Test] ($180)
- Bose 901 Series IV — 1980 – EQ exclusively for Bose 901 Series IV Speakers [Clean-Test] ($120)
- DBX II Model 128 — 1981 – Dynamic Range Enhancer / Noise Reduction System [Clean-Test] ($220)
- Gemini EQ-1000 — 1988 – 5-Band Stereo Frequency Equalizer [Needs Test] ($40)
- Lafayette SQ-M — 1972 – 4 Channel Decoder – Never used – Rare [Clean-Test] ($240)
- MCS 683-2270E — 1984 – Stereo Graphic Equalizer – 7 Band [Clean-Test] ($60)
- Pioneer FS-700 — 1970 – Stereo Electronic Cross Over / Wood sides [Clean-Test] ($360)
- SIMA Model SSW-6 — 2010 – 6 Zone Speaker Selector with Impedance Protection [Clean-Test] ($40)
- Technics SH-8020 — 1980 – 12-Band Stereo graphic EQ/Frequency Analyzer [Clean-Test] ($320)
- Yamaha DSP-1000U — 1990 – Natural Sound Digital Sound Field Processor [Clean-Test] ($50)