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Car Forum / Driving, Maintenance, Tuning / Car Audio / April 2004Alpine CDA-9811 - Am I nuts?
I sent my Alpine CDA-9811 to United Radio in East Syracuse, NY for repair. The symptoms are as follows: When balance is set to full-right (i.e. R15), there is NO subwoofer output. When set to full-left (i.e. L15) there IS subwoofer output. They've had the radio for 8 days. They have verified that the above operation exists (they duplicated the problem). They contacted Alpine. Alpine says that this behavior is "Normal and is operating as intended." I think the Alpine tech is full of sh.t. They're sending my radio back to me untouched. My CDA-9813 doesn't do that and my CDA-9825 doesn't do that (they both have subwoofer output when set to full L and full R). The 9813 output is stereo, the 9825 is mono. The 9811 is stereo unless HPF or LPF is activated - in which case it operates in mono mode. Mono mode, however, doesn't mean "1 pre-out" - it means L & R channels are summed and the same signal is sent to each pre-out. Anybody else have a CDA-9811 that can verify that theirs doesn't act this way? Thanks  Signature-- Gary pick my nose to reply > I sent my Alpine CDA-9811 to United Radio in East Syracuse, NY for repair. > The symptoms are as follows: > > When balance is set to full-right (i.e. R15), there is NO subwoofer output. > When set to full-left (i.e. L15) there IS subwoofer output. Sounds like most head units. What's the problem? PS - In fact, some (maybe even most) amps when bridged only leave one RCA input active. Do you know whether or not your amp is of this type? If so, have you tried switching L and R input to the amp? | > I sent my Alpine CDA-9811 to United Radio in East Syracuse, NY for repair. | > The symptoms are as follows: [quoted text clipped - 8 lines] | input active. Do you know whether or not your amp is of this type? If so, | have you tried switching L and R input to the amp? Thanks for the reply, Mark. As I said, they were able to duplicate it. The reason that it concerns me is that my subwoofer level has seemed low and I was troubleshooting the problem and came across this. I think the sub amp is only getting 1/2 the input it should be. As for the amp, yes I switched inputs / changed rca cables / rewired / etc. All with the same problem - only when turned to the right does the output go away. The amp is an Alpine MRD-M500 - set to 2-ch input. It reacts the same when set to mono input. I replaced the 9811 (temporarily) with a 9825 - and it works flawlessly - and the bass just stomps. btw, the 9825 AND 9813 do not exhibit the same behavior. If it truly is working as designed - well, I don't like it - and when I get it back it's off to eBay :-) I want the new 9833 anyway..hehe. > Thanks for the reply, Mark. As I said, they were able to duplicate it. Well, you don't really know how they duplicated it though. Maybe they did the same thing you did. > The > reason that it concerns me is that my subwoofer level has seemed low and I [quoted text clipped - 4 lines] > All with the same problem - only when turned to the right does the output go > away. What happens when you unplug one RCA and leave the other connected when the balance is set in the middle? If your suspicions are correct, this should mean that the output goes away completely when you unplug the L but leave the R plugged in (to either RCA input). > The amp is an Alpine MRD-M500 - set to 2-ch input. It reacts the same when > set to mono input. Are you positive that it needs both inputs to operate? Have you checked the manual? > I replaced the 9811 (temporarily) with a 9825 - and it > works flawlessly - and the bass just stomps. btw, the 9825 AND 9813 do not > exhibit the same behavior. That's probably more telling. But not smoking gun evidence. > If it truly is working as designed - well, I don't like it - and when I get > it back it's off to eBay :-) I want the new 9833 anyway..hehe. Yeah, if you don't like it, get something else. Because even if the effect is NOT real, it'll still be in the back of your mind anyway. |
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