dbx 90

Little is documented about the dbx 90 as a standalone product name. A 1983 equipment profile in Audio (March 1983, p.70) describes what appears to be a tape noise reduction unit. Given the specifications listed alongside Dolby B, Dolby C, and dbx NR noise reduction options, it is likely a single-ended or companion unit to dbx's encode/decode system. The profile gives frequency response figures that vary with tape type, and signal-to-noise ratios that depend on which noise reduction system is engaged. Beyond this one published review, no production years, original price, or detailed design notes have been located.

• Frequency Response: 20 Hz to 17 kHz; 18 kHz with CrO₂ tape; 19 kHz with metal tape
• Signal/Noise Ratio: 68 dB CCIR/ARM with Dolby B NR; 76 dB with Dolby C NR; 92 dBA with dbx NR
• Input Sensitivity: Mike, 0.25 mV; line, 60 mV

eBay Listings

Concord HPQ-90 dbx II Noise Reduction Adapter

$55.00

Lot of 90 Vintage NOS 2400Hz DBX-05PN Miniature Magnetic Aud

$45.00

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• Acoustic Research 312-HO (1996)