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 designed for use in modular analog audio systems, particularly in studio recording environments. The unit is based on the API 560 graphic equalizer but replaces slider controls with Grayhill switches that adjust in 2 dB increments, making settings easier to recall. It has been discussed in professional audio forums alongside units like the API 550A and 550B, indicating its role in high-end signal processing.
Design
The LC25 uses a filter topology similar to early 1970s graphic equalizers, with IC gyrators employed in its circuit design. Instead of faders, it features Grayhill switches stepped in 2 dB increments, which enhance setting recall compared to traditional slider-based EQs.
Reception
Users note the LC25 offers a vintage character with noticeable saturation, particularly in the low end, and mention its 50 Hz and 100 Hz bands as useful for bass shaping. It has been favorably compared to the API 550 series in online discussions, with some preferring its "Liebers Red Dot" version for its tonal qualities.
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