Crown Audio by Harman

Search:     Advanced search


I recently did a gig where a trombone collegue of mine used a Crown clip-on microphone . I was well impressed with the sound quality as the majority of trombone type mics are not so good. I myself am a pro trumpet player and have just about given up using clip-on mics as the sound is inferior (I tested pretty much everything there is. So I am using a large-diaphragm condenser mic at the moment. However for some shows I could use a clip-on mic but don´t want the bad sound associated with them. Do you think your clip-on mics would be up to miking a very loud lead trumpet?

If I used a wireless system, how would I wire your clip-on mic to a Sennheiser Evolution SK100 body pack transmitter?
Nigel Moore

Reply: A Crown GLM-100 clip mic can handle 148 dB SPL, so it should be able to handle a trumpet without distortion. I recommend the GLM-100 omnidirectional mic over the GLM-200 hypercardioid mic because the GLM-100 sounds more natural, has a flatter frequency response, and has much less handling noise . Also, the GLM-100 can accept higher sound levels without distortion. P.A. feedback is not a problem with the GLM-100 because the mic is so close to the trumpet, and the trumpet is very loud.

Crown GLM microphones data sheet

A large part of the sound you get when close-miking a trumpet depends on the mic placement. A microphone position on-axis to the bell sounds very bright and edgy; off-axis placement sounds more mellow or natural. That's because the high frequencies radiate out of the bell in a narrow angle. It helps to experiment with mic placement to get a sound that you're happy with.

The Crown instrument clip-on mic intended for wireless use is the GLM-100E. The Sennheiser SK100 transmitter can be used with a Crown GLM-100E without modification, but with reduced battery life. You will need to solder a 3.5mm (1/8") stereo phone plug to the wires on the GLM-100E cable. Here is the wiring:
Tip: GLM-100E cable red lead.
Ring: GLM-100E cable white lead. Change the line-level pad in the transmitter to 0 dB.
Sleeve: GLM-100E cable shield .
The mic might start distorting as battery power drops, and a fresh set of batteries should fix the problem.

The red lead receives power from the transmitter. The white lead supplies high-level audio to the line input of the transmitter. The shield is ground .

With the unipolar power provided by the Sennheiser SK100 transmitter, the GLM-100E can handle 120 dB SPL. If the trumpet is louder than that, the mic will distort. The wired GLM-100 can handle 148 dB SPL, so it will definitely not distort when used close to a trumpet. I can't predict whether your trumpet will cause distortion in the GLM-100E connected to a Sennheiser transmitter without measuring the SPL of the trumpet close to the bell. Hopefully you can try it out and return it if it distorts.

Others in this Category
document Should I use a Sound Grabber or GLM-100 to mike a piano?
document Which PZM should I choose for drums?
document Please explain the single-mic technique of sound reinforcement (5 questions and replies)
document Bluegrass band (2 questions and replies)
document String band
document Fiddle (violin) (3 questions and replies)
document Bassoon
document Acoustic guitar (4 questions and replies)
document Tabla drums
document Drums, drum set (7 questions and replies)
document Flute (2 questions and replies)
document Grand piano (5 questions and replies)
document Upright piano (3 questions and replies)
document Brass band (symphonic band) or orchestra
document Harp
document Flamenco dancer, clogger
document Congas
document Saxophone, sax (2 questions and replies)
document Mid-side stereo technique
document Opera singer
document Singer (3 questions and replies)
document Upright bass (double bass, acoustic bass)
document Miking a classical music ensemble
document Accordion
document Phasey sound with singer/guitarist
document Miking a Leslie speaker with GLMs
document Miking flute recitals with flat floor mics
document Fishman system with Crown GLM-200E mic