CAPI LC25

A modular equalizer using IC gyrators and Grayhill switches for precise, recallable EQ adjustments in professional audio setups

Overview

The CAPI LC25 is an equalizer module made by Classic Audio Products, Inc. (CAPI). It is built for modular analog audio systems, mostly in recording studios. It is based on the API 560 graphic equalizer, but the sliders are replaced with Grayhill switches that step in 2 dB increments. That makes settings much easier to recall. Professional audio forums discuss it alongside units like the API 550A and 550B.

Design

The LC25 uses a filter topology similar to early 1970s graphic equalizers, with IC gyrators in the circuit. Instead of faders it has Grayhill switches stepped in 2 dB increments, so settings recall better than on a traditional slider-based EQ.

Reception

Users describe the LC25 as having a vintage character with noticeable saturation, especially in the low end. They mention the 50 Hz and 100 Hz bands as useful for bass shaping. Online discussions compare it favorably to the API 550 series, and some people prefer the "Liebers Red Dot" version for its tonal qualities.