Legacy AXS API
215 High-Pass, Low-Pass Sweep Filter
Features
• Wide range 6dB per octave LO-PASS control
• Wide range 12dB per octave HI-PASS control
• Balanced input stage
• Passive filter design for smooth tone
• Unity gain throughout
• Hard Wire BYPASS switch
• Transformer coupled output to +28dBu
• All discrete design
The API 215 is a unique passive, sweepable filter, designed specifically to
contour the sound to preserve the natural tone of the signal. Its extreme
flexibility, repeatable settings and superb sound make it ideal for all studio, live
sound and broadcast applications.
The 215 design is a passive low pass filter with a slope of only 6dB per octave,
and a passive dual high pass filter with a slope of 12dB per octave. The filters are isolated from each
other with the same discrete transistor buffer used in the famous 550 series equalizers. This minimizes
interaction between the filters, as well as providing a low impedance source for the filter following the
buffer.
The filters are both continuously adjustable, with a range from 20Hz to 20kHz in two bands. The low-
pass filter has a range from 500Hz to 20kHz, and the high-pass filter has a range from 20Hz to 600Hz.
This covers a broad range of frequencies throughout the entire audio spectrum.
Because of the subtle nature of the 215 filter, it finds a home with uses like rolling off the low end of a
hi-hat, where a natural sound is desired, not the usual "phase-shifter" sound of a 18 to 24dB per octave
filter found on most consoles. It can also be used to thin out room mics, without the complete loss of
low end, which again usually results from steep filter circuits.
The controls for the 215 High-pass, Low-pass Sweep Filter function as follows:
IN (in/out switch): Activates the module
• Illuminates when engaged
LO-PASS: Sets the frequency of the low-pass filter – sweepable from 500Hz to 20kHz
HI-PASS: Sets the frequency of the high-pass filter – sweepable 20Hz to 600Hz
500 Series Equalizer Slot
The Legacy AXS channel strip is 1.5” inches wide in order to accommodate a VPR Alliance approved
500 Series slot. This slot is designed to house the channel equalizer. The 500 Series EQ slot may be
fitted with one of the four API equalizer/filter choices or any VPR Alliance approved 500 Series module,
except preamps (the channel signal flow is not designed to accommodate a preamp in this slot.)
API provides four spectral processor options for the 500 Series EQ slot:
550A Discrete 3-Band EQ (standard configuration for most channels)
550b Discrete 4-Band EQ
560 Graphic EQ (standard configuration for some channels)
565 Filter Bank
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