I'm hoping the expertise here can help me debug a problem I'm having
The amplifier on my Def Tech SuperCube I subwoofer died, so I'm trying to replace it using an external amp (QSC RMX 2450). This is how envisioned everything to be connected and just work (it doesn't):
Denon 3311ci subwoofer out on pre-amp
connected to (via RCA cable):
TRS input (1/4 microphone connector) on QSC RMX 2450
connected to (via speaker wire):
Definitive Technology SuperCube I subwoofer (w/o amp; just connected straight to the driver)
This setup causes a very large hum to the subwoofer and barely audible music. So I think haven't consider input impedance or speaker impedance properly or something. Any ideas?
And some more info:
- If I connect the 2450 amp to an iPod with a small bookshelf speaker, it seems to work fine, but I was a bit surprised that the speaker wasn't super loud at full volume. There is no hum and it is loud (actually quite loud) at 100% volume (on the iPod), but I expected to have to keep the iPod at 5% volume maximum because the amp is so powerful for a small bookshelf speaker (probably 50W max input). But maybe this is normal behavior ?
- Any of the 3311 pre-amp outputs (subwoofer, FL, FR, whatever) cause a very loud hum and barely audible music even if I use the bookshelf speaker instead of the subwoofer. This doesn't seem right to me. Maybe I have a problem with the 3311 as well? Or?