Impedance matching Shure Beta 58A
Reply #5 – 2011-09-08 20:29:15
Wait, andy o: you're taking the 1/8" TRS output of the Hosa adapter straight into the TRRS coupler, and then plugging the TRRS cable into the touch's headphone jack? Ah, that's the problem: inserting an 1/8" TRS plug into an 1/8" TRRS coupler will short the back ring (closest to sleeve) to ground all the way through the rest of the signal chain, and therefore, the touch will see the TRRS plug as if it were just a TRS, and therefore just headphones. In order for the touch to recognize a given plug as coming from something with a mic, the back ring connection must *not* be connected to ground - it can be nothing, it can be a data bus (which I believe is how it's done with the various in-line control pods), but it must not be shorted to ground. So, you'll need to "remap" the output from the Hosa adapter so that it lands on only the right channel ring of the TRRS, but the back ring is left unconnected - IOW, exactly what I did with my camcorder cable. You'll need an 1/8" TRS female-female coupler to connect the output of the Hosa to an 1/8"-to-dual-RCA cable, and then an 1/8" TRRS-to-3 RCA camcorder cable and an RCA barrel to couple one of the RCAs from the 1/8"-to-dual-RCA to the right channel of the camcorder cable. Edit: Some time ago at work, I remember seeing an 1/8" TRS female-to-dual RCA female adapter - a molded adapter, not a cable - in one of our A/V adapter "tackle boxes", which would be perfect for what you're doing, but honestly, I've never seen another...but it's got to be out there somewhere!