amp or deck?

drivingafocus · Post by **drivingafocus** » Sun May 15, 2005 10:14 am

I am having a problem with my new deck, I had a pioneer deh-p5400, 45X4 watts, I just bought a pioneer deh-p6700mp, 50X4 watts,and when I hooked up the new deck, both had a button to turn the subs completely off, but on the new deck when I turn the subs off or if the subs are on and the volume is at 0, the subs seem to be pulseating, I have the deck grounded to the car, I swithed it from the harness, I thought maybe that was the problem, but is my problem with the deck or the amp? also the new deck is more powerful but the subs dont hit as hard as with the old deck.

William from NOLA · Post by **William from NOLA** » Sun May 15, 2005 2:16 pm

Check your RCA connections. Make sure they aren't touching any metal. I'd also recheck all connections to the amp which means disconnect all and reconnect. Just because it "looks fine" doesn't mean it is sometimes.

Mithrandir · Post by **Mithrandir** » Sun May 15, 2005 2:58 pm

as for the subs not hitting as hard, play with the sub level control on the deck if it has one. My subs pop when i turn it off because i have it hooked to the power on of the deck cause my remote lead is messed up.

drivingafocus · Post by **drivingafocus** » Sun May 15, 2005 6:41 pm

ok, i checked the rca cables and they wern't touching any metal, I also reconnected everything on the amp,1 thing Idid come across though is there may be a short in my ground wire, would this cause it to do what its doing? also 1 other quick note, before I got the new deck my ground had fallen out of the amp onto the power and blew the radio fuse in the car, I wasn't sure what had happened because my harness in the oldradio I had riged up to work right, to make a long story short, I couldn't re-rig the harness to power the old deck so I am not sure if when the ground fell out if it had done something to the amp or not. Could I have possibly fried the amp when I blew the fuse?

lotas · Post by **lotas** » Sun May 15, 2005 7:30 pm

drivingafocus wrote:ok, i checked the rca cables and they wern't touching any metal, I also reconnected everything on the amp,1 thing Idid come across though is there may be a short in my ground wire, would this cause it to do what its doing? also 1 other quick note, before I got the new deck my ground had fallen out of the amp onto the power and blew the radio fuse in the car, I wasn't sure what had happened because my harness in the oldradio I had riged up to work right, to make a long story short, I couldn't re-rig the harness to power the old deck so I am not sure if when the ground fell out if it had done something to the amp or not. Could I have possibly fried the amp when I blew the fuse?

That sounds like it might be the problem. The ground connection shouldnt be able to "Fall out", it should be a solid strong connection, first off. But if it did touch other metal of the amp, or the power terminal, I would say there is a chance something fried in the amp. I cant tell you what though.

I dont understand why a fuse in your radio blew when your amp was damaged? Those are only connected by RCAs but the signal is going from radio --> amp, isnt it? anyone?

Mithrandir · Post by **Mithrandir** » Sun May 15, 2005 7:35 pm

remote turn on, maybe that could blow a fuse in the radio

William from NOLA · Post by **William from NOLA** » Sun May 15, 2005 9:30 pm

It sounds like the the power and ground mixed at the amp, sending some power reversely through the remote wire; basically a combination of what lotas and Mithrandir said.

Most likely the amp is toast if the two cables met at/on the amp. You could have it looked at by an electronics repair shop, but you may end up paying more than you would need for a new amp in some cases. The same sort of thing happened to me with a Pioneer amp, except it was my own fault because I didn't unhook the power cable from the car battery.

Fishy · Post by **Fishy** » Sun May 15, 2005 11:06 pm

Most likely the amp is toast if the two cables met at/on the amp.

Maybe not.

If the power wire touched the the ground wire directly then tons of current would flow, but primarily through those two wires. If the power wire touched the amp's chassis then you might get a good chunk of current running through the amp's internal ground plane, traces, or whatever. That might cause some damage.

If the subs weren't pulsating before the incident then yeah, something may be screwed up. Otherwise it might just be noise. I'd try redoing the amp's ground(sand, sand, sand the paint away). If that doesn't help try disconnecting the rca's while the subs are pulsating to see if that makes a difference.

-Fishy

Mithrandir · Post by **Mithrandir** » Mon May 16, 2005 8:04 am

i fried my rcas by disconnecting them while my system is runnin

:

Fishy · Post by **Fishy** » Mon May 16, 2005 9:14 am

lol, they melted?