API 5500

Stereo/dual mono 550 EQs with range switch
  • Classic 550b Equalizer design
  • Two range switches to individually alter gain steps
  • Usable as a 550b, 550D or 550M

SKU
697124
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The beginnings of the 5500 circuit can be traced back to the original 550 equalizer designed by Saul Walker, the founder of Automated Processes Inc. The 550 was designed as a console equalizer, which uses an unbalanced input due to the architecture of the recording console. Because the ergonomics of a console dictate that the controls take up little space, sometimes the number of included functions can be limited. The 5500 is specifically designed to address these limitations; it has a balanced input, a true straight-wire bypass, an integrated power supply with noiseless muting and a range control that expands its versatility to mastering applications.

Typical of API products, the 5500 contains no integrated circuits in its signal path. The gain comes from two hand-built 2520 Operational Amplifiers in each channel. The balanced input is handled by a 2510 Discrete Operational Amplifier, which is similar to the 2520, but without the high-current output stage. A key component of the API sound, the 2520 coupled with the API 2503 output transformer, is capable of delivering +30dBm before clipping. 

Key features:

  • Classic 550b Equalizer design
  • Two range switches to individually alter gain steps
  • Usable as a 550b, 550D or 550M
  • True hardwire bypass
  • Balanced In & Out on XLR
  • Unbalanced input on 1/4"
  • EQ In/Out switch

Specifications

Specifications
Brand API
Gross Shipping Weight - Volumetric (kgs) 6.0000
EQ Type Solid State
Number Of Channels 2
Parametric or Graphic Parametric
Rack Spaces 1RU
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