The BSS DPR402 is an industry standard dual channel compressor / limiter / de-esser.

Front panel adjustments:
De-eser: de-ess, frequency.
compressor: threshold, ratio, attack, release, gain.
Limiter: peak limit.
Illuminated in/out switches, meters, side-chain monitor.

Security Panel For applications which require a recessed blank front panel unit, a security cover kit is available to convert the DPR402 into a fully tamper-proof rack mounting unit. All front panel controls are then hidden behind a blank steel panel.

Output Balancing A separate output balancing unit is available to provide full transformer balanced and floating output sends to drive 600 ohm loads.

Frequency contouring The DPR402 has internal insertion points on the control and subtract side-chains so that fixed filter networks can be fitted giving users any standard form of emphasised contouring to the compressor action. This does not interfere with the normal de-essing functions.

See full specs on BSS's own data sheet

Not sure how to use a compressor? Visit Dr. Know's Audio Clinic for a quick guide.

Price to buy

Full BSS price list

Input Section 
Impedance 10KOhm, electronically balanced. 
Max Input Level +20dBv.
Input CMRR Better than -50dB 30Hz-20Hz.
Input Connector XLR3-31 or equivalent. 
Wired as pin 1 o/c, pin 2 cold, pin 3 hot.

Output Section 
Impedance Less than 1 Ohm unbalanced, current limited.
Max Output Level +20dBv into 600 ohms.
Output Gain + 20dB continuously variable.
Output Connector XLR3-32 or equivalent. 
Wired as pin 1 earth, pin 2 earth, pin 3 hot.

System Performance 
Frequency Response + 1dB 25Hz-20kHz. Ultrasonic filter -3dB@ 30kHz.
Noise Equiv. input noise -86dBv 22Hz -22kHz, -82dBv CCIR weighted.
Distortion Unity gain, + 10 dBm output, below threshold: THD 0.03% 20Hz-20kHz.
IMD 0.01%SMPTE, 10 dB compression. 
Threshold 0dB. 1kHz, 5 sec rel. time setting: 2ND HARMONIC 0.15%.
3rd Harmonic 0.05%. IMD 0.25% SMPTE.
Crosstalk better than -85dB 20Hz -20kHz.
Compressor 
Threshold -30 to +20 dBv cont. variable.
Compression Ratio 1:1 continuously variable to infinity:1.
Max. VCA Range 30dB.
Attack Time 11 steps 50µsec-80msec.
Release Time 10 steps 5msec to 5 sec and AUTO.

Auto Time Constant A two part program-dependent time constant. Typical attack time is 200 µsec on fast transients, release time 10msec for 63% recovery from a 10dB 4msec response, and 1 sec for a 10dB 40 msec response.

De-esser 
Threshold Range -30 to +20 dBv continuously variable.
Ratio Infinite, at and above twice the set frequency.
Frequency Range 800Hz to 15kHz continuously variable.

Peak Limiter 
Threshold Range +4dBv to +20dBv continuously variable.
Ratio 20:1.
Attack Time Fast setting 150µsec, Slow setting 750µsec.
Release Time Fast setting 100msec, Slow setting 500msec.

Dimensions: 482 x 44 x 228mm (19in x 13/4in x 9in) overall.
Weight 4kg
Electrical Supply 120-220V +105-20% 50/60Hz 15VA.