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Author Topic: Wireless microphone setup for smaart  (Read 3726 times)

Chris Delcambre

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Wireless microphone setup for smaart
« on: November 21, 2017, 11:32:27 pm »

What's everybody using for wireless setups for smaart? Shure, senn, lectrosonics?

Thanks
Chris
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Ivan Beaver

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Re: Wireless microphone setup for smaart
« Reply #1 on: November 22, 2017, 08:45:59 am »

What's everybody using for wireless setups for smaart? Shure, senn, lectrosonics?

Thanks
Chris
The SINGLE most important thing is a NON COMPANDING system.

Most wireless mics have companding-so search carefully.  It will screw up the results of a measurement system due to the compression and expansion of the signal.

We us a lectrosonics system that was first eveloped for wireless interface (as far as I know-maybe it was another reason)
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Christian Ekren

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Re: Wireless microphone setup for smaart
« Reply #2 on: November 22, 2017, 09:37:58 am »

Lectrosonics TM400 would probably be your best bet. Purpose built for measurement and calibration.
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Nathan Riddle

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Dave Garoutte

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Re: Wireless microphone setup for smaart
« Reply #4 on: November 22, 2017, 05:55:34 pm »

The SINGLE most important thing is a NON COMPANDING system.

Most wireless mics have companding-so search carefully.  It will screw up the results of a measurement system due to the compression and expansion of the signal.

We us a lectrosonics system that was first eveloped for wireless interface (as far as I know-maybe it was another reason)
Is the problem the companding or the resultant delay?
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Peter Morris

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Re: Wireless microphone setup for smaart
« Reply #5 on: November 22, 2017, 06:32:32 pm »

Is the problem the companding or the resultant delay?

The problem is companding (TX compression - RX expansion)  - that's the advantage of the Line 6, its signal chain is basically straight into a 24bit A/D with no companding.  Delays in the measurement system are easily accounted for.
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Ivan Beaver

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Re: Wireless microphone setup for smaart
« Reply #6 on: November 22, 2017, 07:35:49 pm »

  Delays in the measurement system are easily accounted for.

Agreed.

And if the same mic is used, any delay is simply not an issue.  Whatever is "common" doesn't matter.  It is the DIFFERENCE in the measurement that matters.
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Lyle Williams

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Re: Wireless microphone setup for smaart
« Reply #7 on: December 09, 2017, 07:25:34 am »

I thought the line 6 model 35 had an inbuilt high-pass filter.
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Don Boomer

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Re: Wireless microphone setup for smaart
« Reply #8 on: December 10, 2017, 06:38:34 pm »

The problem is companding (TX compression - RX expansion)  - that's the advantage of the Line 6, its signal chain is basically straight into a 24bit A/D with no companding.  Delays in the measurement system are easily accounted for.

Digital systems that use data compression will also be problematic. Some do, some donít.
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Langston Holland

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Re: Wireless microphone setup for smaart
« Reply #9 on: December 17, 2017, 06:33:53 pm »

Don is exactly right. Digital wireless is no guarantee of the absence of artifacts that can make the system unusable for measurement applications. Iíve found that wireless systems of any type that are capable of fairly high channel counts generally cannot be used as a mic cable replacement for acoustic measurement. The Lectrosonics Hybrid system is a rare exception.

I recently tried a MIPRO ACT-818 receiver with TA-80 plug-on transmitter. It is a digital system that is advertised "to eliminate compander noise" and to be suitable for "acoustical measurements". I beg to differ. :)

Measurements

I set the TA-80 transmitter to its 24dB gain setting (reasonable for many measurement mics) and found the 1kHz clipping/limiting threshold and made log swept sine and Maximum Length Sequence (MLS) measurements 1dB below that threshold. Then I repeated those measurements 20dB below that threshold. I included MLS measurements because that process is extremely sensitive to non-linearities and time variance (LTI violations). Swept sines are the most forgiving of the non-LTI behavior present in almost all real acoustic systems to some extent. MLS freaks out if LTI is violated even slightly and makes a great blood hound when youíre looking for imperfections. Green and pink traces are MLS.



I made the same tests on the Line 6 XD-V75 receiver with TBP12 beltpack transmitter. The cable for the beltpack: XLF pin 2 to TA4F pins 3-4. XLF pins 1-3 to TA4F pin 1. TA4F pin 2 unconnected. The big downside is no phantom power like the MIPRO plug-on has. Green and blue traces are MLS.

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God bless you and your precious family - Langston
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