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Alesis 3630 Compressor Dynamics Processor Features
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Alesis 3630 Compressor Dynamics Processor Specifications
A great choice for recording, mixdown, instrument rigs, and sound reinforcement, the Alesis 3630 Compressor provides two independent full-featured compressor/ limiters in one rack space while offering excellent sonic quality for any application from studio recording to live sound or broadcast. As an independent dual-channel compressor, the 3630 offers separate controls for two different source signals. Plus, two fully independent gates with threshold and rate controls allow you to easily and efficiently stifle unwanted ambient noise.
 The Alesis 3630 Compressor (see larger image). |
The 3630 offers Ratio, Threshold, Attack and Decay controls to customize its compression response for even the toughest signals. You can also choose between RMS and Peak compression styles, plus Hard and Soft Knee dynamic curves for every application from subtle gain control to in-your-face punch. Other advanced dynamics processing features include precise signal metering, a sidechain for keying or ducking effects, and stereo linkable operation.
Specifications
|  The Channel A controls.
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About Compression, Limiting, and Noise Gating
Compression and limiting both affect a signal's dynamic range, although in slightly different ways. This type of signal processing can be used as an effect (e.g., increase a guitar or cymbal's sustain) or for more practical applications, such as avoiding tape saturation or restricting the dynamic range of program material for broadcast applications.Limiting
A limiter does not affect the signal going through it until that signal reaches a particular threshold. Above this threshold point, the limiter prevents the signal from becoming any louder by providing as much attenuation as is needed to keep the signal from exceeding the threshold. If the signal drops below the threshold, then the limiter "goes back to sleep" and leaves the signal alone unless it exceeds the threshold again.
 Hard knee response (above) and soft knee response (below). |
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The speed with which a limiter responds to the input signal is also important. If the limiter tries to follow every little nuance of music, the sound can be overly "choppy." Often, you'll want the limiter to affect dynamic range over a somewhat longer period of time. The Release control sets this time period.
Compression
Compression is similar to limiting, but rather than clamp all signals to a constant threshold, the output changes at a lesser rate than the input. For example, with a 4:1 compression ratio (as set with the ratio control), a 4 dB input level change produces a 1 dB output level change; an 8 dB input level change produces a 2 dB output level change.
Noise Gating
To understand a gate's principle of operation, consider a "manual noise gate." Suppose you're listening to an audio signal being processed by a relatively noisy effect. As long as the audio signal is present, its level will generally be higher than the noise, thus masking it. However, when the audio signal goes away, the noise is no longer masked and can be heard.
If you connected a volume control after the noisy effect, you could eliminate the noise by turning down the volume whenever there was no audio signal. Then, as soon as the audio signal (which masks noise) returned, you could turn the volume up again.
A noise gate performs a similar function, but automatically. You set a particular noise gate threshold, and the gate compares the input signal level to that threshold. If the input signal exceeds the threshold, the gate acts like a volume control that's all the way up, and lets the signal through. If the input signal is lower than the threshold, the gate acts like a volume control that's all the way down, and blocks the input from reaching the output. If the threshold is set just above the residual noise level, then the gate will be closed whenever there is hiss, thus giving a quieter signal.
Alesis 3630 Compressor Dynamics Processor Overviews
Since its introduction, the 3630 Compressor™ has become the most popular dynamics processor ever made. The reason is easy to understand: it provides two independent full-featured compressor/ limiters in one rack space while offering excellent sonic quality for any application from studio recording to live sound or broadcast. The 3630 offers Ratio, Threshold, Attack and Decay controls to customize its compression response for even the toughest signals. You can also choose between RMS and Peak compression styles, plus Hard and Soft Knee dynamic curves for every application from subtle gain control to in-your-face punch. As an independent dual-channel compressor, the 3630 offers separate controls for two different source signals. Plus, two fully independent gates with threshold and rate controls allow you to easily and efficiently stifle unwanted ambient noise. Other advanced dynamics processing features such as precise signal metering, a sidechain for keying or ducking effects and stereo linkable operation make the 3630 the most powerful compressor in its class.
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Customer Review
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Product Information and Prices Stored: Jan 12, 2012 19:58:04 |
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