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The BSS DPR-504 is a 4-channel professional noise gate which has been designed for simple and intuitive use. It incorporates modern integrated circuit technology for high packing density and long term reliability. Ingenious proprietary techniques are employed to make the engineers life easier without compromise to performance or versatility.

•Four independent channels that are linkable to give either one or two stereo linked master/slave modes
•Flexible parametric Key filter for frequency conscious gating with absolute precision. The parametric EQ approach provides a higher degree of control for accurately rejecting spurious unwanted gate triggers than similar shelving filters.

•Key listen provides operator with the facility to hear the effect of Key side- chain EQ or other processing effect as an aid to setting up.
•Dual metering system which indicates both average and peak responses simultaneously and gives the operator precise information regarding the signal levels around the threshold point. Separate 'gate open' marker LED, linked to gate dynamics, continually monitors interrelation between gate activity and the actual signal.
•IN switch which allows the operator to force open the gate, in the absence of signal, to check the integrity of the signal lines, and observe set dynamics. This also functions as channel bypass.

•Selectable 'Fast and auto' attack modes which have been optimized for accurate and transparent performance over the widest variety of program material. Self adjusting Auto mode deals cleanly with varying dynamics whilst a super fast mode is available for demanding percussion and synthesizer transients.

•Simple to operate, combined Hold and Release control which has special audio-tapered characteristics to give subtle 'musical' envelope shaping.

•Rear mounted electronically balanced XLR input and output connectors.

•Rear mounted 1/4" jack socket allows access to external side-chain key input for uses such as external EQ, delay or keying by and unrelated signal.

BSS Audio DPR-504 Quad Noise Gate Features:

Each channel features
A parametric key filter with key filter listening.
Simultaneous key level and threshold metering with average and peak metering.
A gate status LED.
A RELEASE/HOLD control (hold tracks proportionally with release times).
Attack switchable auto/fast (auto tracks signal dynamics for optimum setting).
Link (links two channels together).
Key source allows external triggers.

BSS Audio DPR-504 Quad Noise Gate Specifications:

Input Section
Impedance: Balanced 12k ohm differential
Max. Input Level: + 20dBv
CMRR: better than 50dB, 20Hz to 20Khz
Connector: XLR3-31 or equivalent style

Output Section
Impedance: Balanced and floating to drive 600 ohm loads
Headroom: +20dBv into 600 ohm load
Frequency: +/-1dB 20Hz to 20kHz. Ultrasonic low pass filter
Response: -3dB at 32kHz
Noise: Measured to CCIR 468-2
Zero attenuation: <-86dBv
Maximum attenuation <-90dBv
Distortion: THD <0.05% 20Hz to 20kHz
SMPTE IM: <0.02%
Connector: XLR3-32 or equivalent.

Operating Controls
Key filter: Variable between 100Hz and 20kHz centre frequency
Key width: Variable between 0.5 and 10 octaves
Key source: Switchable internal or EXTernal via 1/4" RTS jack
Threshold: Variable between +20dBv and 30dBv
Attack: Audio attack switchable FAST (20uS) or AUTO (40uS - 5mS) program
dependant
Release: Combined Hold/Release function variable 1mS to 4S
Hold period tracks proportionally with release
Release has custom audio taper
Range Switchable attenuation between -70dB and -20dB
Link: Stereo linkable in pairs 1/2 and 3/4 Channels 1 and 3 become masters
EXT Socket 3 pole 1/4" RTS jack socket to provide unbalanced access into key side chain

Metering
Key level: Simultaneous average and peak reading 12 point LED display showing 28dB range of Key side-chain signal
Gate open: Single triangular LED showing exact gate status
Mimics response profile as set by attack and release controls