How many times have you found yourself wishing you had one more quality filter set to remove the rumble from a vocal or to tighten up a bass so it will sit better in the mix? How many times have you found that there is nothing but noise above 5 kHz on a bass or guitar? This remarkably compact filter set will give you the required results without breaking the bank or ruining your hard fought audio. Another gem in the often overlooked API 200 series collection.
API 215L features
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 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.
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 entire 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 can be used in the Legacy Series Consoles or in the L200 Rack. 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.
- Wide range 6 dB per octave LOPASS control
- Wide range 12 dB per octave HIPASS 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
- Number of Bands: Two
- Filter Type: Passive Sweepable Shelf
- Filter Frequency Centers
- Low Pass: 500 to 20KHz
- High Pass: 20 to 600Hz
- Input Impedance: >20K Ohms, Balanced
- Output Impedance: 85 Ohms, Transformer coupled, Balanced
- Nominal Levels: -15 dBu to +15 dBu
- Clipping Level: +28 dBu
- Frequency Response: 0, -.3, 30 to 20kHz
- Noise: 98 dB below +10 dBm output, unweighted. 20-20 kHz
- Distortion: THD: .02% (+4dB @ 2K)
- Connectors: .100 spaced ELCO
- Power Consumption: 16 Volts DC, 60mA max at +24 dBu out
RACK FRAME AND POWER SUPPLY OPTIONS
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