Waves API 550: Equalizer Plugin

The API 550 introduced visionary EQ curves. Q varies with gain so boosting adds a more focused musical quality—while reducing gain provides natural subtle-to-steep tone shaping. Developed in close collaboration with API the 550A/B are loving re-creations of these late-60s legends. Expertly selected frequencies lift instruments up or place them further back—just as easily as they can sweetly shape a mix’s contour. For individual tracks buses or full masters the 550 defines musical transparency.

Ahead of the Curve

API’s pioneering proportional-Q curve made it a favorite for high-end studios that demanded musicality with transparency rather than the vintage sound that was the mainstay in the 60s and 70s.

Two EQs One Coherent Goal

The 550A and 550B are designed to the same exacting standards and sound quality but offer different EQ philosophies—the 550A’s more general slant or the 550B’s surgical problem-solving approach.

All That Changes Is the Tone

API’s EQs bring clarity to the zing of a violin string the snap of a snare the intimacy of a vocal or the contour of a mix. These EQs were engineered to bring out the very best of whatever sound you put through them.

Harness API 500’s Symmetrical Boost and Cut

With Proportional-Q boost and cut are symmetrical—which works wonders for instruments. You can differentiate two layered guitars solely with EQ: a medium boost on one guitar a medium cut by the same amount on the other. Now the two "add up" to the same energy in that part of the spectrum. This is easier to do with API than with any other EQ.

Features:

• 550A: 5 selectable frequencies for 3 bands and 50 Hz – 15kHz filter
• Ideal for general problem-solving or sweetening
• Switchable analog harmonic distortion and hiss
• 550B: 4 overlapping EQ bands with multi-octave ranges
• High/low bands for 550A and B switch between peak and shelving
• Convenience features like phase switch output trim and metering

Requirements:

Platform	CPU	RAM	Disk	Notes	Additional Requirement	Audio Card	Ports	Internet Required	32 Bit Support	64 Bit Support	Plugins
mac	Intel or Silicon Architecture	8	16		Minimum: 1024x768 Recommended: 1280x1024 / 1600x1024 USB displays are not supported as the primary display.			0	0	0
windows	X64 compatible Intel or AMD CPU	8	16		Minimum: 1024x768 Recommended: 1280x1024 / 1600x1024			0	0	0