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Manufacturer's Description from API
Discrete HP/LP Sweep Filter
Features
- 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
The API 215L 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 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 the complete loss of low end which again usually results from steep filter circuits.
The 215L can be used in the Legacy, Legacy Plus or Vision 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.
About Manufacturer
API (Automated Processes, Inc.) is world famous for its all-discrete audio products: studio and broadcast mixing consoles, and a full line of rack mount mic preamps, equalizers and processors. It all began with a dream. It was 1968. The company: Automated Processes Inc., formed by men with a vision. Best known for their now legendary "2520 amplifier", this unique amp has been and will continue to be the heart of all API discrete products. It continues to provide reliability and sonic purity unmatched by the competition. The resulting console met the needs of the music, commercial and broadcast industry. API became the leading audio broadcast console manufacturer for radio and television networks and high profile stations. In addition, recording studios, large and small, began using API.....and receiving rave reviews from engineers and producers. There are over 700 API consoles across the nation and around the world, including the three major networks. Over thirty years later, many of these consoles are still in daily use in some of the most prestigious recording and broadcast facilities in the world because, to date, there are few, if any consoles of equal sound quality at a cost-effective price.
Specifications
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Specifications |
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Number of Bands: |
Two |
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Filter Type: |
Passive Sweepable Shelf |
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Filter Frequency Centers: |
Low Pass: 500 to 20 kHz High Pass: 20 to 600 Hz |
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Input Impedance: |
>20 K Ohms, Balanced |
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Output Impedance: |
85 Ohms, Transformer coupled, Balanced |
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Nominal Levels: |
-15 dBu to +15 dBu |
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Clipping Level: |
+28 dBu |
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Frequency Response: |
0, -.3, 30 to 20 kHz |
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Noise: |
98 dB below +10 dBm output, unweighted. 20-20 kHz |
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Distortion: |
THD: .02% (+4 dB @ 2 K) |
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Connectors: |
.100 spaced ELCO |
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Power Consumption: |
±16 Volts DC, 60mA max at +24 dBu out |
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Size: |
1.25" X 2.65" X 6.75" Deep |
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Size (Boxed for Shipping): |
4.5" X 6.25" X 10" |
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Actual Weight: |
.51 lb. |
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Shipping Weight: |
.88 lb. |
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