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Author Topic: Multiple 2.4ghz microphone channels  (Read 4899 times)

andrewdbowes

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Multiple 2.4ghz microphone channels
« on: January 13, 2017, 11:29:10 pm »

Hey there crew, anyone have suggestions or experience with bundling multiple digital mic systems together?  I have six Sennheiser EW D1 systems and I'm not sure if mounting them together in a rack is a good idea or not.  What is the school of thought for combining 2.4ghz antennae together?  Anyone know of any products like boosters or directional antennas that are for 2.4ghz systems?

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Robert Lofgren

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Re: Multiple 2.4ghz microphone channels
« Reply #1 on: January 14, 2017, 06:05:51 am »

Line6 have an antenna combiner and also active antennas for the 2.4ghz band.
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andrewdbowes

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Re: Multiple 2.4ghz microphone channels
« Reply #2 on: January 14, 2017, 01:03:21 pm »

Line6 have an antenna combiner and also active antennas for the 2.4ghz band.
I've seen these Line6 accessories on their website but would Line6 2.4ghz wireless accessories be cross compatable Sennheiser's 2.4ghz wireless products? 

I've read that 2.4ghz wireless is less affected by intermodulation than their radio mic counterparts so does this allow me to use a number of wireless receivers clustered without issues?

I'm trying to keep things fairly simple.  Does it make sense to rack mount them all into one rack or should I be spacing them out a certin wave length from each other for least self interference?

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andrewdbowes

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Re: Multiple 2.4ghz microphone channels
« Reply #3 on: January 14, 2017, 02:33:11 pm »



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Don Boomer

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Re: Multiple 2.4ghz microphone channels
« Reply #4 on: January 16, 2017, 01:25:58 am »

Digital wireless for the most part are immune to IM problems, but it really doesn't have anything to do with the 2.4g band.

I can't think of any reason the Line 6 antenna distro shouldn't work with the Sennheiser mics. With 8 systems I would certainly recommend using an antenna distro system and avoid having an antenna farm.

Line 6 makes an 360į and a 180į plate antenna with a built in line amp. Or you could use the 2.4g helical from RF Venue. It doesn't have the line amp (which would raise the noise floor) but it does have about 12dB of gain and the benefits od a helical system.
« Last Edit: January 16, 2017, 07:13:24 pm by Don Boomer »
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Don Boomer
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andrewdbowes

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Re: Multiple 2.4ghz microphone channels
« Reply #5 on: January 16, 2017, 01:33:07 am »

Digital wireless for the most part are immune to IM problems, but it really doesn't have anything to do with the 2.4g band.

I can't think of any reason the Line 6 antenna distro shouldn't work with the Sennheiser mics. With 8 systems I would certainly recommend using an antenna distro system and avoid having an antenna farm.

Line 6 makes an 360į and a 180į plate antenna with a built in line amp. Or you could use the 2.4g helical from RF Venue. It doesn't have the line amp (which would raise the noise floor) but it does have about 9dB of gain and the benefits od a helical system.
Thanks very much for your response Don!  If it were you, which solution would go with?  This is a new topic for me which there doesn't appear to be a lot of accessable information available.

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Kevin Maxwell

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Re: Multiple 2.4ghz microphone channels
« Reply #6 on: January 16, 2017, 09:26:06 am »

I donít know if it has changed but I remember reading that there is a limit as to how many 2.4gmics will work together and I thought it was 6 or 8. And I also thought one of the other considerations was that these systems are more powerful then standard WiFi and will over power any other WiFi devices making it impossible to use anything else WiFi in the 2.4g range in the room.  This includes Tablets or phones to control digital consoles and any WiFi (in the 2.4g range) in the room that your audience might use for their phones. Just something to keep in mind.

Don, Didnít you used to work for Line6 and do you know the answers to these statement?
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Lee Buckalew

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Re: Multiple 2.4ghz microphone channels
« Reply #7 on: January 16, 2017, 12:47:11 pm »

I donít know if it has changed but I remember reading that there is a limit as to how many 2.4gmics will work together and I thought it was 6 or 8. And I also thought one of the other considerations was that these systems are more powerful then standard WiFi and will over power any other WiFi devices making it impossible to use anything else WiFi in the 2.4g range in the room.  This includes Tablets or phones to control digital consoles and any WiFi (in the 2.4g range) in the room that your audience might use for their phones. Just something to keep in mind.

Don, Didnít you used to work for Line6 and do you know the answers to these statement?

For Sennheiser the answer is up to 15 systems although that is up to 6 in standard configuration and up to 15 in multi-channel configuration. 
The limiting factor is going to be how crowded the 2.4GHz spectrum is and if there is room available.

Lee
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Lee Buckalew
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Stephen Swaffer

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Re: Multiple 2.4ghz microphone channels
« Reply #8 on: January 16, 2017, 12:48:32 pm »

We use 5 Line 6 mics together and have had decent results-though my experience is that a WiFi router will take interfer with the mics.  The real headache is the failure mode-they seem to be fine for a quick check-but when someone starts using it they drop out.  Anytime a new router/access point is added in the room you'll need to verify reception.  We wound up going to 5 ghz for mission critical wifi  and hope no one gets too close with a hotspot.

A staff member purchsed some GLDX mics because a "sales technician" told him we shouldn't add more Line 6.  The GLDX were unusable-constantly dropping out and re-linking.

The Sennheiser manual says "up to 15 systems in an optimal situation".  In this day and age when will that ever happen?  No WiFi, no hotspots no bluetooth in the room?  Another red flag to me is in the troubleshooting section, dropouts can be caused by holding the mic wrong-so now I have another item to train talent on and butt heads over?  Also, the GLDX would try to relink any time the mics got within 6-8" of each other.

We use the Line 6's with the factory jumpers for antenna's.  For up to six systems, I might be OK with a 2.4G system, but I'll fight to keep any more out of our system.
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Steve Swaffer

andrewdbowes

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Re: Multiple 2.4ghz microphone channels
« Reply #9 on: January 16, 2017, 03:09:38 pm »

Yes the Shure GLXD systems are terrible, those were our first try at digital but there was so much dropout we returned all four of our units.  The sales staff at our Long & McQuade Musical Instruments were kind enough to accept the used mics back at a full refund.  Obviously ULXD4 would be nice but we would only be able to afford a couple channels max. 

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Re: Multiple 2.4ghz microphone channels
¬ę Reply #9 on: January 16, 2017, 03:09:38 pm ¬Ľ


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