5500 Dual Equalizer API
Appendix
A1 5500 Technical Specifications
Rear Connectors: XLR & ¼” TRS Input, XLR Output
Input Impedance: 20K Ohms
Balanced Output Impedance: 75 Ohms, Transformer Coupled, Balanced
Maximum Input Level: +32dBu
Maximum output Level: +32dBu
Frequency Response: +/- 1dB from 20Hz to 30kHz
Signal to Noise Ratio: -105dB
Power Requirement: 18 Watts
Size: 19” x 1.75” (1U) x 11.25” deep
Size (boxed for shipping): 23.25” x 6.5” x 16”
Actual Weight: 10 lbs.
Shipping Weight: 14 lbs.
Filter Frequency Centers: LO: 30, 40, 50, 100, 200, 300, 400Hz
LO-MID: 75, 150, 180, 240, 500, 700, 1kHz
HI-MID: 800, 1.5k, 3k, 5k, 8k, 10k, 12.5kHz
HI: 2.5k, 5k, 7k, 10k, 12.5k, 15k, 20kHz
Filter Boost/Cut Steps: +/- 2, 4, 6, 9, 12dB
Range Multiplier: x1, x0.5, x0.25
A2 5500 Transformer Option
There is a field upgradable option for a transformer-coupled input. The discrete balanced
input circuitry is bypassed using this transformer. It uses the highest quality line input
transformer, which can provide low distortion and wide bandwidth when fed from
conventional professional gear. Other brands of audio equipment will encounter clipping at
around +24dBu, but another API device could distort any input transformer since it is
capable of an undistorted +30dBu output.
Since API equipment is capable of signal voltages that are typically twice as large as most
professional equipment, it is possible that the input transformer will experience some
distortion in the low frequencies when fed signals beyond +24dBu.
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