Focusrite CM25 Mods
The Focusrite CM-25 (aka Scarlett) mic is a small diaphragm condenser in a large-diaphragm mic body.
The mic isn't actually terrible. It avoids most of the sins of cheap condenser mics. The circuit is a through-hole design made with generic but not awful parts. The capsule, while tiny (like 16mm diameter), isn't painfully bright or sharp or thin.
The mic is one you'll outgrow quickly, though. And because the metalwork is pretty nice, we recommend replacing the mic's capsule and circuit with our highly upgraded parts.
First, replace the capsule with our TSB-2555. The capsule includes our custom-designed harness, plus all the screws and wires needed for installation.
Next, replace the mic's circuit with our ETL1. This is a premium implementation of the Schoeps CMC5 design, adapted for use with the TSB capsule. It is uncompromising in its parts selection, and shocking in its performance, thanks to its carefully selected and biased NOS JFET, imported polypropylene signal caps, and low-noise parts throughout.
Note too that the circuit board has a pad switch. To access it, remove the mic body. (There is no easy way to make it accessible from outside the microphone.) With the pad engaged, the modified CM-25 makes a formidable close mic for toms.
Read more about the ETL1 circuit kit.