Aphex 4b-1 Lunchbox

Hey everyone!

Thanks for chiming in! I have Aphex 4B-1 lunch boxes. These are the ones with 1/4 and tt jacks on them. I was wondering if anyone knows if these are balanced or unbalanced inputs. I am wondering the same for the outputs.

Using balanced connections and gear, there seems to be a -6db loss from the signal going in to the signal coming out. I'm not sure if its going in ok and dropping on output?

There are jumpers inside which are set to High In and High Out. These match current 500 series pinouts.

I am testing these using known working 500 series modules.

Thanks everyone! There doesn't seem to be much info or schematics for these.

hi
see attached pic for pinout of the Aphex CX-1 . This one was built for the 4B-1
input is unbalanced , output may be balanced if optional transformer installed