This circuit kit contains very high-grade components, including a NOS transistor, US-made output capacitors, polypropylene filter caps, and a custom-wound transformer. The T84-55 is a single-stage JFET/transformer circuit, based on Neumann's KM84. See below for specific capsule installation instructions for the Luna.
The RK-12 works equally well with our T84-55 circuit. It has a broader, lower amplitude presence boost in the high frequencies, giving the a much more balanced sound than does the original capsule. The RK-12 is an alternative replacement/upgrade capsule for the Luna. It is better suited to the stock circuit than is the Luna's original capsule, and it pairs beautifully with our T84-55 circuit also (see below). The RK-47 is a fine replacement/upgrade capsule. Because the mic's circuit is linear, the Luna sounds too bright and hyped on many sources.
This capsule suffers from a significant and harsh-sounding presence peak around 11kHz. The capsule in the GT55 is K67 type, very similar to what you'd find in most of the large-diaphragm condensers made by MXL, Behringer, CAD, Apex, etc. We have two modification options for the Luna microphone: #1: Capsule Replacement
The mic has relatively high output, but relatively high noise, and a slightly over-bright voicing that limits the microphone's utility. The circuit is a simplified version of what we first saw in the Groove Tubes GT55, although without a switchable pad or high-pass filter. The display shows the headphone and mic input levels plus a graphic of the pattern selected.M-Audio Luna Mods The M-Audio Luna is a large-diaphragm FET condenser with a transformer-coupled circuit. Once we’d plugged the microphone in, Logic picked it up straight away, although it booted out our previous output device interface, so we had to force it back in to hear the results.Īround the front you have the mic input level rotary and pattern selector while headphone gain and USB mic mixer are on the other side. There’s nothing difficult about using it either. M-Audio’s Uber Mic promises a hell of a lot for its £99, including four switchable polar patters, an internal headphone amplifier, a USB mic mixer rotary, zero latency monitoring and a mini LCD-type display. The quality of USB microphones is increasing all the time, with more being released that are good enough to go into the studio.
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