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API 550A 500-Series Equalizer

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Product Code: 2694
API 550A
$1,135.25
UPC:
799456981758
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API 550A 500-Series Equalizer

The API 550A 500-Series Equalizer has been a staple in the recording industry for decades, since it was originally designed in the 1960's, becoming API's standard in 1971 - when they started building consoles. To this day, the 550A is still herald as one of the best EQs on the market.

The 550A provides reciprocal equalization at 21 points in 5 steps of boost to a maximum of 12dB of gain at each point. The fifteen equalization points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be inserted independently of all other selected equalization settings. Frequency ranges and boost/cut are selected by three dual-concentric switches, and a pushbutton "in" switch allows the EQ to be silently introduced to the signal path. A small toggle switch is used to insert the band-pass filter into the 550A.

API 550A 500-Series Equalizer Features

  • 3 bands of classic API equalization
  • Each band offers 7 API selected frequency centers
  • Reciprocal and repeatable filtering
  • Maximum 12 dB of boost/cut per band
  • EQ Band 1 and 3 offer shelf/peak switching
  • "Proportional Q" narrows filter Q at extremes
  • Traditional API fully discrete circuit design
  • High headroom +30 dB clip level

API 550A 500-Series Equalizer Specifications

  • Input Impedance: 66 kΩ high level / 17 kΩ low level
  • Output Impedance: Less than 85Ω (transformer isolated)
  • Nominal Operating Level: –15 dBm to +12 dBm
  • Insertion Loss: None (bridging)
  • Frequency Response, Unequalized: ±0.5 dB 30 Hz to 20 kHz
  • Noise: Unequalized, output noise of –90 dBm, high level strapping and –98 dBm, low level strapping, 20 Hz to 20 kHz unweighted
  • Distortion: .05% THD max, 30 Hz to 20 kHz @ +4 dBm / .07% THD max, 30 Hz to 20 kHz @ +18 dBm
  • Clipping Level (3% THD): +30 dBm
  • Power Requirement: ±15 volts to ±18 volts @ 70 ma

API 550A 500-Series Equalizer Includes

  • 550A 500-Series Equalizer
  • Manual
  • One year factory service and Five year parts Warranty

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5
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