FEATURES

• Stereo or dual mono operation. The 3630 can serve as two totally independent units, or both sections can be strapped together for stereo operation. In stereo, gain changes in one section are "tracked" by the other section to eliminate wandering of the stereo image.
• Peak or RMS response. Determines whether the limiter will base its operation on signal peaks or average signal levels. Each has its uses with different types of signals (for example, peak with drums, and average with complex program material).
• "Hard knee" or "soft knee" response. Each type of response gives a different limiting action. The hard knee response is generally considered more "severe," and the soft knee response, more "musical."
• Individual bypass switches for each channel. This makes it easy to compare the processed and unprocessed sounds.
• Side chain connections. Insert EQs and other devices for applications such as de-essing (removing sibilance), adding treble to limited signals, "keying" one signal with another, "ducking" (e.g., making a signal such as background music become lower in volume in response to another signal, such as narration), and other applications.
• +4 dBu or -10dBV operation. This provides signal level compatibility with nearly all studio setups.
• Front panel knob calibrations. Knobs are calibrated to allow for easy setup and operation.
• Built-in stereo/dual mono noise gate. This can reduce noise when compressing or limiting. Each section can also operate as a stand-alone noise gate.
• Extensive metering. Each channel has a 12-LED display to indicate the amount of gain reduction, a second 12-LED display to show input/output levels, and a dual-LED display to indicate noise gate status.

SPECIFICATIONS

Dynamic Range: >118dB, "A" weighted
Signal to Noise Ratio: >100dB, "A" weighted
Headroom: +18dBu
Frequency Response: 10Hz to 30kHz, 0/-.5dB
Crosstalk: < -85dB @ 10kHz
Compression Threshold Range: -40 dBu to +20 dBu
Compression Ratio: 1:1 to ∞:1, selectable hard or soft compression knee
Peak Attack Time: 0.1 ms to 200 ms
Peak Mode Release Time: 50 ms to 3 seconds
RMS Average Mode Attack and Release Times: Program dependent
Gate Threshold Range: Continuously open (no gating) to -10 dBu
Gate Rate Time: 20 ms to 2 seconds
Impedance: OUTPUT: 470Ω, unbalanced SIDECHAIN: 2KΩ, unbalanced
Output Gain Control Range: -20 to +20 dB
Nominal Output "Zero" Level: Switchable, +4dBu or -10 dBV
Distortion: Less than 0.05% @ +4 dBu, 20Hz to 20kHz, "A" weighted with 6 dB compression, any switch setting, nominal attack and release times
Indicators: 12 segment gain reduction LED display with -1 to -30 dB range, 12 segment
LED input/output (selectable) level display with -30 to +6 dB range, gate open/close LEDs.
Switches: Stereo/dual mono link, bypass, peak/RMS mode, input/output monitor, knee characteristics (hard/soft)
Input and Output Connectors: 1/4" mono phone jacks
Side Chain Connectors: 1/4" stereo phone jacks
Power Requirements: External 9 VAC transformer (supplied), UL approved
Size: Standard 1U rack mount
Note: +4 dBu = 1.23 Vrms -10dBV = 0.316 Vrms