Legacy AXS API
Channel Signal Processing
Channel signal processing is provided by modules installed in the lower 200 slot and the 500 Series EQ
slot. The lower 200 slot is usually designated for dynamic processing, although a filter set can be
installed instead.
Lower 200 Slot
The lower 200 slot is designed to house one of the three API 200 Series signal processor modules:
225 Compressor/Limiter (standard configuration)
235 Noise Gate
215 Sweep Filter
The lower 200 slot is typically fitted with an API 225 Compressor/Limiter. Accordingly, the channel
controls, master controls, and patch points associated with the routing of the lower 200 slot are labeled
“COMP.” The channel signal flow is not designed to accommodate a preamp in this slot.
The two possible locations for the lower 200 slot are:
Post-preamp/pre-EQ
Post –EQ/pre Insert
The lower 200 slot is routed to the Small Fader audio path by default. In the standard configuration,
the lower 200 slot is located post-preamp and pre-EQ. As an option, the lower 200 slot can be located
post-EQ and pre-Insert in the Small Fader signal flow. This option is set by internal links on the 968
Input Module and cannot be changed during normal operation. The initial locations of the lower 200
slots are specified by the owner when the console is ordered.
The processor in the lower 200 slot can be moved to the Large Fader path on individual channels by
engaging the COMP LRG (compressor large) button on the 968 Input Module or console-wide by
engaging the COMP LRG button in the Master Section.
The processor in the lower 200 slot can be bypassed console-wide by engaging the COMP BYP button
in the Master Section. This provides a shorter signal path if the lower 200 slot signal processing is not
needed. This option is not available on individual channels.
NOTE: The IN button on the installed 200 module must be engaged for the installed 200 module to
process audio. Disengaging the IN button will effectively bypass individual 200 modules on
individual channels.
225 Compressor/Limiter
Features
• Threshold control from +10 to -20dBu
• Variable compression ratio from 1 to infinity
• Release time: continuously variable from .3sec to 3sec
• Attack time: continuously variable from 1ms to 25ms
• "OLD" or "NEW" detection path and sound
• HARD or SOFT compression knee
• Auto-makeup Gain
• LED Gain Reduction meter
• API 2510 and API 2520 op-amps
• Transformer output to +28dBu
The API 225 Compressor/Limiter is ideal for all studio and broadcast
applications. Regardless of the threshold or ratio settings, the output level
always remains at unity. This unique feature allows for real-time adjustments
without the need for changing the output level.
Both NEW ("feed-forward") and OLD ("feedback") methods are selectable, providing two choices of
gain reduction. NEW gain reduction is typical of the newer feed-forward VCA type compressors that
rely on RMS detectors for the gain control voltage. OLD or feedback method is what most of the classic
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