MXL 3000 Mods

MXL 3000

The MXL 3000 is yet-another variation on the MXL 2001 / V67 theme: a 2-stage FET circuit coupled to a low-ratio transformer. But this incarnation contains several upgrades not found in the 2001 and V67: a direct coupled input circuit (no input capacitor) and a large output capacitor. These two changes would be near the top of the list for any DIY circuit upgrade.

The one component that most significantly limits the performance of this microphone is the capsule. It is MXL's common 32mm K67, which tends to deliver an uneven and somewhat hyped high-frequency response. It is prone to harshness on any source with high-frequency energy (cymbals, voices, strings).

We recommend changing the capsule to our RK-12 or RK-47. Both will "re-voice" the microphone, making it much more useful for recording.

The RK-47 gives the microphone a more natural response, with a color that complements acoustic sources such as drum overheads, guitars, and voices (especially male voices).

This capsule is based on the design of the Neumann K47, the capsule found in the U-47.


The RK-12 has a flatter upper midrange than the RK-47, and is in a sense more neutral for that reason. It has a rich, full low end, and a broad boost in the high frequencies that adds excitement without hype or sibilance.

This capsule is based on the design of the AKG CK-12, which was used in the AKG C12 and Telefunken ElaM 251.


Both capsules include all necessary mounting hardware for installation into the MXL 3000.

Both capsules sound different from the stock MXL capsule. Both offer a smoother frequency response that is more complementary to a wider range of sources. Both will allow you to stack tracks with fewer problems, because neither captures sharply exaggerated frequencies that contribute to harshness or distortion in the mix.