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Two Channel Amp w/ Sub

post #1 of 4
Thread Starter 
Hi all,

My receiver fried, and I'm trying to cobble together a basic system with my old speakers just to play music off my phone. We're doing a renovation, so the home theater is out of commission for the six months or so-- I'm just trying to get a decent setup to bridge the gap. I have a two-channel amp (Lepai LP-2020A+) w/o sub output, and my sub (Infinity SUB750) only has line-level inputs. I think the only way to make this work is to use a 3.5mm Y-splitter on the output from my phone, sending one leg to the sub and the other to the amp. Is this correct, or is there a better solution (even involving a modest amount of hardware) that I'm not considering?

Thanks!
Matt

Edit: typo.
Edited by mattgoff - 9/18/13 at 4:33pm
post #2 of 4
Quote:
Originally Posted by mattgoff View Post

Hi all,

My receiver fried, and I'm trying to cobble together a basic system with my old speakers just to play music off my phone. We're doing a renovation, so the home theater is out of commission for the six months or so-- I'm just trying to get a decent setup to bridge the gap. I have a two-channel amp (Lepai LP-2020A+) w/o sub output, and my sub (Infinity SUB750) only has line-level inputs. I think the only way to make this work is to use a 2.5mm Y-splitter on the output from my phone, sending one leg to the sub and the other to the amp. Is this correct, or is there a better solution (even involving a modest amount of hardware) that I'm not considering?

Thanks!
Matt

Without speaker level inputs and outputs on the sub, it is unusable with your current amp. Connecting one leg of a y-splitter will not produce the sound you're looking for from your phone. Do you have another sub available with speaker level in/out connections available?
post #3 of 4
Thread Starter 
Just to close this one out, I guess I was lucky and my proposed setup worked. It turns out the Lepai LP-2020A+ has two line-level inputs: RCA and 3.5mm. It appears that these inputs are internally connected via a simple Y (instead of switched) and feed a single input on the amp. Since it was basically a splitter, I ran my source to the RCA jacks and used the 3.5mm as an output to the sub. I think the quality limit is the amp, not this hacked-together setup, so it's getting the job done until I get a new receiver.

As an aside (and since I know this is the sub forum, not amp), the Lepai amp is a pretty amazing value at $22. The sound quality is decent, although I do hear an low freq hum from time to time (but not always) when the amp is on but no music is playing. I am feeding it with a 50 ft RCA cable, so it's possible that the cable is acting as an antenna. It's also possible (as I've read) that the crappy brick transformer is sending dirty DC. In any event, when music is playing, it sounds great. My only real gripe is that the volume knob has a very bright blue LED which can't be disabled. I may crack open the case and kill it. Also, since I'm using a powered sub, I can't say how it would do with regular bookshelf speakers.
post #4 of 4
You can put masking tape over the LED.. or put a resistor to reduce the output of the LED
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