Tech Question: cell phone mic inputs

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Proformance

DJ Extraordinaire
Nov 6, 2006
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You can run a mix/minus on the aux out of an MG10. I think you can do it on the Mackie ProFX series too but I haven't actually tried it
Any mixer with an Aux out can make a mix minus. Some DJ mixers already have "record outs" that are a mix minus so DJs can record their music set without any of the mics making it into the recording. The DJ gig isn't really my concern because in that scenario it would be fine to grab the audio out only and have the person hold a mic while also talking on the phone. It would appear more personal and familiar as a shared conversation. .

Corporate is different - the meetings may be hours long and whose on the line may change or they may be silent for long periods of time. The boards I would use this on are digital rather than analog; Yamaha CL5, QL5, QL1; Midas M32 & M32R, Behringer X32, etc. Events where I would want to do this would typically need a minimum of 6 mix busses - at least 4 of which can be routed to an Aux output. So the smallest mixer that I can use would be a QSC Touchmix 8 or Midas/Behringer MR/XR16 with a single active phone line.

Each active line requires it's own mix minus bus, so what our resident IT guru doesn't grasp is that in a software environment (conference system) you can have as many virtual busses as you want (generally all done without you even be aware) In a live sound setting however, you have the physical constraints of the console you are using and the configuration parameters of all the other physical devices being connected.

If the phone lines are already VoIP then there's no reason not to use a conference system but, that's not at option at all locations, or it's a pay option that the client gets ripped off for. I want to have alternatives that won't add to their cost and don't require any IT. It's even better when the issue comes up at the last possible moment and I can go to it immediately. (It's how I maintain my reputation as a miracle worker :) APM factor: Anticipation = Perceived Miracle.
 
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ittigger

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so what our resident IT guru doesn't grasp is that in a software environment (conference system) you can have as many virtual busses as you want (generally all done without you even be aware) In a live sound setting however, you have the physical constraints of the console you are using and the configuration parameters of all the other physical devices being connected.

If the phone lines are already VoIP then there's no reason not to use a conference system but, that's not at option at all locations, or it's a pay option that the client gets ripped off for. I want to have alternatives that won't add to their cost and don't require any IT. It's even better when the issue comes up at the last possible moment and I can go to it immediately. (It's how I maintain my reputation as a miracle worker :) APM factor: Anticipation = Perceived Miracle.
And then we have our resident expert that doesn't grasp reality or knowledge in any form. You come here and ask for help - and then you can't resist stomping on those attempting to help you. Please go find somewhere else to entertain yourself. Please also stop acting like you know better than anyone else about things - if anything, you are an expert at that.

Reminder: Expert .. a person who knows more and more about less and less until they know absolutely everything about absolutely nothing.

I'm sorry that those smarter than you, make you feel stupid .. but you know what, the reality is that you can't know everything. When you realize this, maybe you'll actually be able to make some friends and get some help without needing to pay for either of them, all of the time.
 

Proformance

DJ Extraordinaire
Nov 6, 2006
6,738
4,019
Follow up.

I've been able to come up with some configurations that seem to work across a variety of devices. The most common wiring scheme (Apple, Android, ..) places the ground on ring 2 and the mic on the sleeve. The trick is that a minimum voltage (0.7) often has to be present on the input in order for some devices to detect the external mic at the time of connection. Some devices will still require manual changes to the settings even after automatically detecting the external input.

The input itself doesn't seem to care a great deal if it's a line or mic level but, it's necessary to pad a line input -15dB to prevent the possibility of overload.. This can be done inline or at the mix bus when using a console, though a pad still prevents accidental overload.

The method I like best is TRRS to 1 XLR-F and 1 TRS which is a faster conversion to pro audio connections than the iRig2. It also allows easy insertion of a pad or isolation when needed.

Another solution for simpler DJ gear is: TRRS - 2 TRS in 3Ch (not a headphone split.) With -10db gear this works just like the iRig2 for about 1/3 the cost. Haven't checked to see if there's an equivalent pad for consumer cables (3.5 and 6.35 phone plugs) but I do have some 3.5mm isolation transformers that seem to work well.