215L Discrete HP/LP Sweep Filter
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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 hgh 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 following the buffer.
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.
Specifications:
- Wide range 6 dB per octave lo pass control
- Wide range 12 dB 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 +28 dBu
- All discrete design
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