Legacy AXS API
compressors used for the gain control circuit. There also is a SOFT or HARD selector. SOFT provides a
more subtle compression resulting in a very natural, less compressed sound. HARD results in a more
typical, sharp knee type compression that has a much more severe limiting effect.
Release time is adjusted by rotating the inner concentric R knob. Release time constants: continuously
variable from .3sec to 3sec. Attack time is adjusted by rotating the outer concentric A knob. Attack
time constants: continuously variable from 1ms to 25ms.
The 225 also has a side chain input for the detector amplifier.
The controls for the 225 Compressor/Limiter function as follows:
IN (in/out switch): Activates the module
• Illuminates when engaged
THRESH (Threshold): Sets the activation threshold from-20dB to +10dB
RATIO: Sets compression ratio
1 to ∞
1: 1:1…no gain reduction
∞: ∞:1…hard limiting
KNEE (HRD-SFT): Selects the “knee” of the onset of compression
HRD (Hard): Fast curve (more useful for limiting applications)
SFT (Soft): Slower curve (acts as an “over-easy” compressor)
AT (Attack Time): Sets attack time
1ms to 25ms
REL (Release Time): Sets release time
.3 seconds to 3 seconds
TYPE: Selection between “new” and “old” types of compressors.
NEW: “Feed-forward” compressor
OLD: “Feed-back” compressor
-dB (Gain-reduction Meter): LED meter indicates the amount of gain reduction
235 Noise Gate/ Expander
Features
• Threshold control from -45 to +25dBu
• Variable Fine Adjustable Depth to -80dB
• Adjustable Release/Hold Time, 50mS to 3sec
• 2:1 Expander or Noise Gate selection
• Release or Hold switch for release control knob
• Always at unity gain, regardless of settings
• LED Gain Reduction meter
• Uses the API 2510 and API 2520 Op-Amps
• Transformer Output, to +28dBu
The API 235 Noise Gate/Expander has the ability to reduce noise in any type of
program. The 235 can open unusually fast, without losing any part of the sound.
Its extreme flexibility, repeatable settings, and superb sound make it ideal for
all studio, live sound, and broadcast applications.
The 235 is one of the fastest noise gates manufactured today. When an engineer is faced with program
material with a high level of background noise, the 235 can either Gate the signal at a preset Threshold,
or with the use of the Expander function, can reduce the background noise to an almost undetectable
level. This can be achieved without the typical loss of the program material caused by slow triggering
of the signal, or "pinging" caused by false triggering.
With a wide range of adjustment, the 235 can operate from -45 to +25dBu, fitting into any audio
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