Intoduction:
I’d like to share an experience I had using the headphone output jack and a cheap stereo IEM device. I apologize in advance if this is something obvious or if there’s a similar thread that’s been solved already — I used the search engine before posting this though, looked up the headphone section in the manual, and Googled/Chat GPT’d my questions.
As a relatively new user – I’ve had the Quad Cortex for only some months now —, this might come in handy to those migrating from cheaper units.
Background:
I used to play through an Ampero II Stage, which offers a headphone output jack. I plugged a cheap M-Vave device using a 3.5mm stereo cable and had only my signal in my earphones. It was a reliable way to be able to hear myself clearly while the rest of the band would bleed in from the environment — I play mostly small gigs and rehearsals are relatively low volume.
The problem:
After getting the Quad Cortex, I immediately built a pedalboard and did all the cable management already thinking of using the headphone output jack to feed these cheap units when I didn’t need a “pro-level” IEM solution. After routing the cable under the board and plugging the transmitter, all I got was crackle and hiss out of the receiver. No matter how I set up the levels on the Quad Cortex or M-Vave device, noise was always present, making it unbearable to keep using them.
I later learned that low impedance devices will present this problem when connected to the headphone output jack and that most IEM units are low impedance. Therefore, I’d have to pay for a better quality IEM unit, which would probably not fit under the hood, as I had originally intended to use it.
The solution:
I imagined that some sort of loadbox could be used to lower the levels out of the headphone output and make the signal manageable for the M-Vave device. I was able to find an adapter on one of those Chinese sales platforms for a relatively low price.
The adapter is not so big, feels well built (all metal), and it manages stereo signals. To my surprise, it worked like a charm! Although the headphone levels are considerably lower now, there’s no more crackle or hiss. Cleans are clean and distorted rhythm tones are audible.
There are other options where I got this one. I also got an 80 Ohm plug, which I did not test, since the 220 Ohm plug did the job well.
For larger gigs, a “real” IEM solution is advised. But if you’re OK hearing yourself through the IEM while hearing the others as “signal bleed” (in rehearsals or small gigs, where you’re next to the drummer and the PA), this cheap M-Vave device coupled with this adapter will do the job
I hope this helps others in the community.
Cheers from Brazil!
