Question about Lectrosonics MM400 UHF Body-Pack Transmitter MM400B25 Microphone

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How do I increase the output wattage of my bodypack?

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There's not much what you can do on the transmitterside.
If you will increase the distance you have to work on the receiver.
Use some external directional antenna's and amplifier's.


Posted on May 07, 2010


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Having trouble under standing rms with speakers. Some speakers rms is per speaker and other are for both speakers.I am looking for soundstream speakers that would be 150 rms per speaker. Thanks

rms is a method of measuring power (wattage) delivered from an amp to a speaker. In almost every case, wattage capacity of speakers is quoted PER SPEAKER. Likewise wattage output is quoted per amp output channel. Assuming a you plan on a single speaker on each output channel of your amp, you should be in good shape if your speaker wattage capacity equals or exceeds your amp's output rating. I've never seen speakers rated as wattage per pair.

(rms is the dominant way of measuring average watts of an ac sine wave signal)

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A motorcycle generator/alternator will only produce what is is designed for. The only way to increase this is to replace it with a larger output model. You can decrease the load by installing l e d lighting. If you are trying to run additional electronics that are beyond the the bikes capability, look at adding a deep cycle battery that can be charged with an external port. Look at the bikes wattage output then add all of it's lighting. This will tell you how much usable power remains. Do not overload it or will not keep the battery charged.

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Increase volume

The only gain adjustment is the 3 position switch on the side of the bodypack. Flkip that to MIC. Then, turn up the mixer channel to get it loud enough.

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Shure MX418C connection to a wireless bodypack

The MX418 requires phantom power. Unfortunately, a wireless bodypack does not provide phantom power. Thus, you would need to insert a phantom power adapter in between the mic and the bodypack.

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Hi Ralph, what do you mean "turn up the receive" ? You can not increase the wattage output without changing internal components. To increase RF gain and max performance you can upgrade your antenna and tune the SWR to 1:1 to 1. Other than that, a power microphone & bi-linear amplifier are the only ways to make it more powerful.

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What is the 750 w VS the 1500 W ? o Obviously its more power and the heater increases the heat but what does it mean, how much more electricity dose this use ?

It's twice the wattage output and will use almost twice as much electricity when heating. However, it will heat a larger area.

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Question about Sony STR-DE595

NO! It uses the same amps for a and b channels. and you could short it out if its wirer improperly.

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I have the sennheiser ew172, when i play my guitar through it everything sounds fine. good tone, signal, etc. but when i touch the metal casing on the bodypack it makes a scratching/popping noise almost...

Do you have shoes on? Do you have grounding problems in this building?
It sounds like a lack of proper grounding ... try plugging the amplifier into a different power plug and see if the problem goes away or its characteristics change.
Put some shoes on if you are in bare feet. Sneakers. Something with a rubber sole.
It's not a bad cable from your description, it's an electrical pathway problem, where a poorly grounded connection is created when you touch the bodypack.
I am assuming you are merely "touching" the bodypack, as you describe ... not tapping on it ... if you are tapping on it to get the popping noise, then there could be something loose inside the bodypack, teensy weensy stuff.

For audio expertise and PA system help with feedback and noise, try our new DVD "PA Systems for Small Groups" at

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