The API 215L is a unique passive, sweepable filter, designed specifically to contour the sound in
such a way that it sounds natural and seems as if it "always sounded that way". Its extreme
flexibility, repeatable settings and superb sound make it ideal for all studio, live sound, and
broadcast applications.
The 215L design is a passive low pass filter with a slope of only 6 dB per octave, and a passive
dual high-pass filter with a slope of 12 dB 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.
The input section is a balanced circuit using the API 2510 all discrete op-amp, minimizing the
loading effect on any device plugged into it. The output stage is a transformer balanced output,
driven by the all discrete API 2520 op-amp.
The filters are both continuously adjustable, with a range from 20 Hz to 20 kHz in two bands. The
low pass filter has a range from 500 Hz to 20 kHz, and the high pass filter has a range from 20 Hz
to 600 Hz. This covers a broad range of frequencies throughout the audio spectrum.
Because of the subtle nature of the 215L 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
24 dB per octave filter found on most consoles. It can also be used to thin out room mics, without
a complete loss of low end, again, resulting from steep filter circuits.
The 215L Filter makes use of the 2520 and 2510 op-amps and therefore exhibits the reliability,
long life and uniformity which are characteristic of API products.
The controls for the 215L Sweep Filter function as follows:
NOTE: The switch on this module is not part of the automation or recall systems.
ON (On/Off switch): Activates the module
•
A green LED indicator illuminates when engaged
LO-PASS: Sets the frequency of the low-pass filter
•
500Hz to 20kHz
HI-PASS: Sets the frequency of the high-pass filter
•
20Hz to 600Hz
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Страница 232: ...The diagram below indicates which 1068L parameters are controlled by the automation and recall systems ...
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