The S30 is a high-precision 1/4 inch reference microphone for SMAART™, MLSSA™, Spectrafoo™, TEF™, EASERA, and all “audio band” measurements. It feature a razor-flat frequency response, fast impulse response, and exceptional polar characteristics. Relative to the more expensive SM30, the S30 is 64 mm / 2.5 in shorter, is flat to 23 kHz instead of 30 kHz, and has a slightly reduced peak SPL capability. It has virtually no handling noise and is remarkably stable with respect to temperature and atmospheric conditions. The S30 requires 48 V phantom power. Learn More

The TR-40 1/4 inch pre-polarized condenser enhances Audix’s reputation for delivering superior microphone performance at a very affordable price. It is ideally suited as a “cost effective” measurement or calibration microphone, and can also be used for miking group vocals, choirs, pianos, and room ambience. It offers smooth, accurate response from 20 Hz to 20 kHz, and may be powered with 9 to 52 V phantom supplies.

Please note that Rational Acoustics can ship this

product only to destinations in the USA. Learn More

A great little budget-friendly measurement mic with an impressively flat response curve for its price, the RTA-420 features heavy-gauge steel construction and measurement performance to rival high-end microphones costing many times more. Makes a great starter mic, spare or "B" rig mic, goes places you just would be nervous to take your high-end, lab quality mic and makes multi-microphone measurements affordable for the rest of us.

~ Rational can ship this baby just about anywhere! ~ Learn More

The S30BX is a very cost-effective self-powered 1/4 inch reference microphone that is perfect for use with software-based audio and acoustic measurement systems such as SMAART®, MLSSA®, Spectrafoo®, TEF®, EASERA. It's built-in preamplifier with 14 dB switchable gain allows the S30BX to drive most computer sound cards directly, without an external preamp or phantom power supply. The S30BX is powered by a single 6 V (P28L type) battery when running on internal power (good for approximately 300 hours) or can be phantom powered externally. And of course it also features flat frequency response, fast impulse response, and exceptional polar characteristics you expect from Earthworks. It has virtually no handling noise and is remarkably stable with respect to temperature and atmospheric conditions. Learn More