dbx 160 (1976)

An analog compressor limiter with true RMS level detection and the first commercial Blackmer VCA.

Overview

The dbx 160 is a rackmount compressor limiter that dbx introduced in 1976, one of the company's early professional units. It belonged to the dbx 160 series, along with the 161 and 162, and it became a staple in recording studios fast. Its gain control sounds natural even at high compression ratios, and the original dbx 160 VU model is now considered a studio classic. The design is feed-forward, with true RMS level detection, so it responds to the power of the audio signal.

Specifications

Production Year	1976
Input Impedance	50,000 ohms
Compression Ratio	4:1 RATIO
Dynamic Range	from 24 dB to -23 dB
Maximum Compression	infinite compression (approximately 120:1)
Dimensions	95 mm (H) x 235 mm (W) x 267 mm (D)
Original Price	US$300

Design

The dbx 160 was the first commercial audio product to use the Blackmer gain cell, specifically the 200 VCA, paired with the 207/208 RMS detector. It is a feed-forward design with true RMS detection, which lets it sense the actual power of the signal. That makes the compression more accurate and more musical.

Context

David Blackmer founded dbx in 1971, and the 160 series came shortly after. It became one of the company's most significant early product lines. The dbx 160 has been called the world's most popular line of audio compressors since its debut, and it turned up constantly in professional studios in the late 20th century.

Market

Original dbx 160 units sell for steep prices on the vintage market, with pristine examples going for up to $1750. Each unit typically needs at least four hours of technical work to restore and repair.