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API 550A 500 Series 3-band Equalizer Reviews

Modular 3-band Equalizer, 500 Series, With 5 API-selected Frequency Centers, 12dB of Boost/Cut Per Band, and Proportional Q Control

The API 550A is a true classic — an EQ that's been embraced since the late 60s, and a standard by which countless EQs have been judged. Here, reissued in 2004 in its original modular form (after a long, highly anticipated wait), the API 550A puts a piece of music history into your 500 Series chassis. It offers 3-bands of simply classic API equalization, with 5 API-chosen frequency centers available on each band. Thanks to the traditional API fully discrete design, you'll enjoy high headroom, lasting quality, and unbelievable sound from the API 550A.

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Highest Rated Reviews

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Best Tracking/Channel EQ

By Jeff from Virginia on October 17, 2023

The great thing about the API550a is it always sounds good anything. It is my EQ of choice for improving or sweetening a track. Really shines on guitars... never sounds unnatural or phasey. Yes -- it is better than the plugins. I have some other outboard EQs too, but this one is my first choice for tracking or to sweeten a track during mix down.

550a - the hardware difference.

By Rich from Houston, TX on June 20, 2014 Music Background: Recording engineer, Pro musician, Mix engineer.

I A/B compared this with the Waves plug. The low frequencies showed similarities, and the plug seemed like a cleaner version of the hardware. From 300hz and up, the API 550a proved warmer and rounder than the comparatively flat Waves plugin. No source revealed this better than some dirty electric guitars. At matched settings, the Waves plug exhibited a bright, clear sound. The hardware 550a transformed the guitar into a warmer, more harmonically rich track that sat in the mix while remaining present. The guitar was still punchy, but softer around the harsh edges where the plug left it harsh by comparison.
As for the build quality, I don't think it could be more solid, and the design is actually very, very aesthetically impressive in person.
I gave it a 4.5 instead of 5 because the top is a little strident. That's the only complaint.
Preferred uses: Everything except lead vocals, but it absolutely owns overdriven electric guitars.
I could see the plug handing the hardware's job on a kick drum in a busy mix, but that's about it. If you like the plugs, the hardware is going to blow your mind.

Musical........very musical......warm

By Andy Mendoza from JAM Studios, San German, Puerto Rico on December 17, 2011 Music Background: Guitarrist, Producer, Grammy voting member

Dial the frequencies and boost on this EQ and you immediatle perceive the warmth. This is the best EQ I have ever used........so simple to operate yet so much sound from it. You will not be dissapointed........worth every penny.

Not my cup of tea

By JP Quezada from --------- on November 18, 2021 Music Background: recording and mixing engineer since 1992

It's built like a tank, works flawlessly and looks gorgeous.

But for some reason its sound does not impress me, I prefer SSL, old neves and new RNDs and the much cheaper Electra from Kush.

The 2db steps in the gain knobs are sometimes too much o too little.

API Reissue

By Sweetwater Customer on May 9, 2017

Compared to the vintage API gear the reissued is as close as you can get. That is not a bad thing! The 550A is no exception. The 550A is clear and punchy and can boost or attenuate drastic or subtle with its sweepable indented concentric knobs. There are sweet spots on this unit, but not with the same settings as the vintage 550. In a word, the reissue is slightly different. However, it still retains the punchy vibrant sound of API. Get ready for the new series of API. I welcome it with open arms. Grab a few of these for your lunchbox.

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