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A black API 550b 500 Series equalizer module shown vertically, with four large round aluminum rotary knobs stacked down the center, concentric frequency and boost/cut markings around each knob, API branding and the "550b" label at the top, and an IN switch at the bottom.

API 550b 500 Series 4-Band Equalizer Module

$1,300.12USD

Checkout with Envoy Music. This item may be dispatched by an approved fulfillment partner.

Best for

Players matching the published factory/retail specs listed above.

Who should skip

Anyone needing fully sweepable, continuously variable parametric control or user-adjustable Q, since the 550b switches between seven fixed frequencies per band and its Q is fixed by the Proportional Q design. Also skip if you have no 500 Series frame and power supply, if you need more than +/-12 dB of boost/cut, or if you need stereo from a single unit (this is a one-channel module).

Watchouts

Unsourced claims are omitted. Listing-specific mods, kits, or incomplete units may not match the base model specs.