I have at least a couple of dynamic mics (audio technica ATM63HE and sennheiser nd537 ) which show very very less bass frequencies compared to other mics, even the same model, is it because the coil is somehow broken or moved or what could it be?
thanks and regards
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Re: loss of bass frequencies in dynamic mics
That's one correct assumption, but it's actually the element that gets damages causing the coil to rub. Open the top up and see if there is any damage, sung a magnifying glass as the tiniest crack could go un-noticed by the naked eye.
In testing these 2 did you change the frequency at all? trying with a different receiver, having another mic on the "bad" mics frequency?
Loss of lows can also be a sign of a bad wire as this sometimes tend to act as a high pass filter.
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Audio Technica and Sennheiser each have proprietary connectors for their mics. A lot of times the mics require Phantom power which is drawn from the battery of the pack.This is important as the mic will need to be wired correctly to function. The first thing you will need is the correct plug from the company. Check with Sennheiser customer Support for the correct part. If you aren't extremely good at soldering, do not attempt this. You can change the plug but the wires are extremely delicate and can short easily. Moreover because of the phantom power, the plug must be wired correctly for the mic to function, or you may end up damaging the mic by sending phantom power up the wrong line. I would advise having a music store or pro audio service that handles these products do the wiring for you. If you feel you are up to it, you can do it yourself, but be careful.
If this is only when you hit the bass drum, it's picking up feedback from being too far inside the drum or pointed at the wrong part of the head. Use a mic stand and position the mic off to the side, but in front of the head, pointed at the midway point between the center and edge of the drum head. This should eliminate the problem. If the noise is still present, have someone qualified to work on microphones look at it to determine what the problem is.
I hate to be the bearer of bad news but those units are fixed frequencies and cannot be changed. You either have to find a mic that matches your receiver or vice-versa. The freeway 200 series comes in 3 freqs. two of witch you have with the addition of 170.245. Maybe you can find someone who has a damaged mic but still has the receiver with the freq. that you need for your mic.
There are different frequencies available and being used in each location.
To get a basic idea of which frequencies are available in your area, try this online tool: http://www.sennheiserusa.com/findfrequency/ or use the literature provided with the Sennheiser gear (usually a useful chart comes with the wireless gear).
Also, remember that your transmitting frequencies need to be spaced apart a minimum of .400 MHz (or 400 kHz).
Frequency selection shouldn't cause feedback problems though. If you select a frequency for a mic that a local TV station is already using to broadcast, it will cause RF Interference (Radio Frequency). You'll probably hear static noises, pops, or since your Sennheiser has a Squelch feature, just drop-outs in audio.
So first consult the available charts to find a set of frequencies that should be available in your area. Then, if one of your mics is experiencing such an issue, try moving it .400 MHz to the nearest unused frequency and see if the RFI goes away. Repeat until the RFI no longer manifests.
It really depends on where you will be using the microphone and and whether it is just going to be used for fun at home or in a club oor for recording?
Some golden rules for microphone selection.
1) Make sure the microphone is Uni-Directional. This means it will only pick up sound from the direction it points in. You are less likely to get feedback or background intereference.
2) For a vocalist, make sure the mic is a reasonable size. If it is too small and you need to hold it, after a while it becomes fiddly and uncomfortable.
3) When singing always use a foam hood or pop filter with the microphone. This will reduce explosive sounds on the letter "P" etc.
4) Choose a microphone with a wide frequency response but not too much bass which can make vocals sound boomy.
5) Finally, the microphone must have a reasonable dynamic range so that if you suddenly shout it does not distort excessively, but it will also work when you speak or sing softly.