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From Our Research Team:

A Classic API EQ Made for the Modern Studio!

The API 5500 dual equalizer puts the great sound and classic design of an API original into a rackmountable package that's even more versatile! Based on the venerable 550 equalizer designed by API founder Saul Walker, the 5500 adds new features such as a Range control for finer adjustments, true hard-wire bypass, and an integrated power supply that lets you apply mutes noiselessly. Two hand-built 2520 op amps (coupled with API's 2503 output transformer) provide plenty of headroom for clean operation. Whether you're tracking, mixing, or mastering, you'll love what the 5500 does for your sound.

API 5500 Dual Equalizer at a Glance:

• The legacy of a classic API equalizer
  
• No ICs in the signal path, plenty of headroom
  
• A finer range of control
  
• True bypass means no signal loss and no "thumps"

The legacy of a classic API equalizer
The 5500 manages to make a legendary EQ design more relevant and user-friendly than ever. The lineage 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, due to the architecture of the recording console, uses an unbalanced input. 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 it versatility to mastering applications.

No ICs in the signal path, plenty of headroom
Like all 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. Besides being a key component of the API sound, the 2520 coupled with the API 2503 output transformer is capable of delivering +30dBm before clipping. With this much headroom, it is unlikely that the 5500 can be driven to distortion unless perhaps another API unit is driving the input!

A finer range of control
The Range control feature gives you a high degree of control over the 55OO. The range of the amplitude controls can be reduced to 1/2 or 1/4 of their stated scale, providing a means of adjusting the tonal balance with finer resolution in an even gentler manner. This should be especially useful for complex program material as contained in stems or submixes, and is ideally suited for mastering purposes.

True bypass means no signal loss and no "thumps"
You'll appreciate the 5500's true hardwire bypass. In this mode the output connector is wired directly to the input. Shortly after the power is first applied, or immediately after it is lost, a special circuit enables bypass mode so signal is never lost and power thumps are never heard.

API 5500 Dual EQ with Range Switch Features:

• Classic 550B equalizer design
  
• Two Range switches individually alter gain steps
  
• Useable as a 550B, 550D or 550M
  
• Peak/Shelf switch on HI and Lo bands
  
• True hardwire bypass
  
• Balanced in and out on XLR
  
• Unbalanced input on 1/4"
  
• EQ In/Out switch

The API 5500 equalizer adds modern functionality to a classic API EQ design!

Specification Detail Number of Channels 2 Number of Bands 4 Tube No Frequency Response 10Hz to 30kHz Freq Range High 2.5-20kHz Freq Range Hi-Mid .8-12.5kHz Freq Range Mid No mid Freq Range Lo-Mid 75Hz-1kHz Freq Range Low 30-400Hz Boost/Cut Range ±12 Q Type Fixed, 12dB/oct High Pass Filter No hi-pass Low Pass Filter No lo-pass Bypass Yes Inputs 2 x XLR, 2x TRS Outputs 2 x XLR Rack Spaces 1U Height 1.75" Width 19" Notes Shelf switches, lo and hi Manufacturer Part Number 5500

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