DBX 363X Dual Noise Gate, 1990-1993, made in China

Link: dbxpro [Service Manual, PDF] | radiomuseum

DBX 363X DUAL NOISE GATE, half rack design, can accommodate up to four channels of gating in one rack space. The 363X can be used in the studio or in live applications. In the studio it can eliminate headphone leakage into the microphones, gating drum mics to eliminate rattling snares or to tighten the sound of a kick drum, gating instrument mics to eliminate amp noise, muting the mixdown inputs to the two-track as an economical solution to automation.

In live applications it can gate signal processing gear that produce hum such as synthesizers, samplers and electronic drums, microphones for lead vocals, background vocals, drums and other musical instruments, microphones that are intermittently used, noisy digital and analog reverb and delay devices. The 363X gating action can be controlled by an external signal at the Key Input on the rear panel. This is useful for applications such as frequency weighted gating or anticipatory gating for zero attack times.

Specifications

Input Characteristics
Key Input: Unbalanced = 20kΩ
Maximum Key Input Level: +20dBu
Key Input Connector Type: 1/4" Phone Jack
Audio Input Impedance: Unbalanced = 10kΩ
Maximum Audio Input Level: +18dBu
Audio Input Connector Type: 1/4" Phone Jack

Output Characteristics
Output Source Impedance: Unbalanced = 22Ω, Phone
Minimum Load Impedance: Greater than or equal to 600Ω
Maximum Output Level: +18dBu into 600Ω
Connector Type: 1/4" Phone Jack

Performance Characteristics
Frequency Response: 20HZ-20kHz (± 0.5dB)
THD Distortion: <0.08%, Any amount of compression @ 1kHz
IMD Distortion: <0.2% SMPTE
Equivalent Input Noise: -85dBu Unweighted
Dynamic Range: 103dB
Attack Time: <100μs
Release Time: 30ms -9sec
Threshold Range: -90 to +20dBu
Threshold Characteristic: Hard-Knee
Attenuation: Hold Time: Adjustable, 0 to 3Sec

SControls, Indicators, Meters
Controls: Stereo Couple Switch, 1 per channel; Threshold Knob; Hold Knob; Key Monitor Switch; Key Engage Switch; Bypass Switch
Indicators: Stereo Couple: Red; Open: Green; Hold: Yellow; Release: Red; Key Monitor: Red; Key Engage: Red; Bypass: Red
Stereo Coupling: Internal; Front Panel Switch

General
Power Line Requirements: 90 - 120VAC, 50/60HZ, Switchable to 240VAC
Power Consumption: 7W
Dimensions: 1.75" (H) x 8.5" (W) x 7.25" (D)
Rack Space: 1 Rack Unit, Half Rack Design
Net Weight: 1,135 kg / 2.5lbs/5lbs shipping weight
Warranty: Two-year, parts and labor: Subject to limita- tions set forth in our Standard Warranty. Factory assistance and service will be available throughout the life of the product.