This adaptor is designed to match 600R output impedance to 2.5K input impedance. It may be used to connect a microphone to a portable recording device, camcorder, or PC.
I read the iPhone has the ground/mic reversed from a typical TRRS connector, so I just bought that adapter.
... to the PC via the mic inputs... I get low signal and very loud hiss. What am I missing?
I don't know the math of impedance matching so sorry if this is obvious. From that information,
I'm thinking the problem is with the adapters... somehow... It looks like you have all the right stuff... Are you sure the male-to-male adapters are stereo (TRS)? Do you have a continuity tester or ohmmeter? I think the tip on the TTRS connector needs to "eventually" connect to the tip on the Hosa plug.
QuoteI read the iPhone has the ground/mic reversed from a typical TRRS connector, so I just bought that adapter.I'm not sure what "reversed" means... I believe the tip is the mic signal, and the sleeve is the ground... The two ring connections need to line-up and work with a regular TRS headphone plug . The DC polarity might be reversed for an electret condenser "computer mic", but your dynamic mic doesn't use DC power so the DC polarity doesn't matter.
It seems to me that lower impedance should be easier to "detect" than a higher impedance, but I don't know what the iPod is doing.
Most computer mic inputs are rather low quality. I don't know about the iPhone/iPod. A different transformer could probably give you more signal. But, it depends on what you're recording too. If you are recording a live rock band, you can probably get-away with no transformer...For quality recordings, a better solution is a mixer or preamp (with a low impedance XLR input) into the computer's line-in, or a USB interface with an XLR mic input. (Shure makes a little "microphone to USB" adapter, but it costs more than your PG58. ) Or if you need something more portable, a digital recorder might be the solution.
QuoteI don't know the math of impedance matching so sorry if this is obvious. From that information, The voltage ratio is proportional to the impedance ratio. 600 -> 2500 ohms will give you ~ 4x the signal (~ +12 dB). A 600 -> 10k transformer would be in the ballpark of +20dB. The voltage ratio calculations only hold if you don't "load down" the transformer output (secondary) with a low-impedance load. And, you don't get a power boost with a step-up transformer.... Voltage goes up and current goes down.
I'm revisiting this also cause I just bought this, which I just couldn't pass up at the price (specs here). I connected the Beta 58A into that with a regular XLR-XLR cable, and there is audio all right. The problem is that it's still too low, even at the max level (this device uses batteries). I see that I still need to impedance-match this. The problem now is that the two transformer adapters that I bought before are either too low or too high (600-2.5k and 250-50k). I've been googling without any success, is there a transformer that will get my 150 Ohm mic close to the 2.4k of the iXZ device?I was wondering about other mic options for this thing, anyone has any thoughts about its phantom power capabilities? I'm using garageband now, and recording acoustic guitar and voice mostly. I saw the AT 2021 recommended in another thread. Any thoughts?
I'm getting a lot of hiss noise because the mic signal is low, the level meter can't even get up halfway with the gain all the way up, and my mouth/instrument just a couple inches from the mic. The Beta 58A is a dynamic mic btw, unless I'm not fully understanding what "condenser" means. Maybe you're confusing it with the Beta 87A?
It sounds like there's some kind of EQ on the iPhone's mic input (haven't RMAA'd it yet ), at least a low-cut filter, but it would definitely be useable for "scratchpad" applications.
thanks for the recommendation, Arnold. I found it at Amazon for the same price. For this application, is there anything else I should know re: mics for stage use vs. mics for recording use? Any thoughts about that mic vs. the AT2021? Seems to have better specs, it's $20 more.
What about this one AT2020? It's even cheaper, can get it for $70 at Amazon. Sorry for this many questions that might seem basic, but I'm struggling to grasp all these differences between mic types. I play nylon-string guitar, fwiw.
I think that would be even better, I mean I was just using the Shure cause it's the only one I had, but recording at some distance would be better for me I guess.