The left side of this setup died..? No idea.

[dustyk]

Greetings!

I'm a fairly new hobbyist who, long ago, took just enough physics to trick myself into thinking I had a proper understanding of the basics of AC circuits. As a result, I totally killed the component system I recently installed in my girlfriend's car. I've come to realize I don't know everything ..a terribly costly mistake. Anyone care to tell me where exactly I went wrong? I'd much appreciate it. Anyway, her setup:

Amp (+) running to 5.25" Rockford R152-S woofer's (+) terminal; the component tweeters connected per the norm to the secondary terminals.
12ga line running from the R152-S (-) to the 2nd component woofer, similarly connected, with its (-) terminal running back to the amp (-)

Anyway, even providing even extremely conservative power, the 1st component set died, sort of.. low volume, weird timbre. Sounds out of phase.. the 2nd set, on the right front of my car, are still fine.

Anyone have any thoughts..?

[seankane]

Originally Posted by dustyk

Greetings!

I'm a fairly new hobbyist who, long ago, took just enough physics to trick myself into thinking I had a proper understanding of the basics of AC circuits. As a result, I totally killed the component system I recently installed in my girlfriend's car. I've come to realize I don't know everything ..a terribly costly mistake. Anyone care to tell me where exactly I went wrong? I'd much appreciate it. Anyway, her setup:

Amp (+) running to 5.25" Rockford R152-S woofer's (+) terminal; the component tweeters connected per the norm to the secondary terminals.
12ga line running from the R152-S (-) to the 2nd component woofer, similarly connected, with its (-) terminal running back to the amp (-)

Anyway, even providing even extremely conservative power, the 1st component set died, sort of.. low volume, weird timbre. Sounds out of phase.. the 2nd set, on the right front of my car, are still fine.

Anyone have any thoughts..?

What amp are you running? You have both (-) accounted for but you only listed 1 (+) Are you running these in parallel to a mono amp? Are you bridging them to a 2 channel amp? Providing the final impedance is 4 ohms per side parallel would be a 2 ohm load. To a mono fine but to a 2 channel bridged alot of juice to the components. Make sure all your polarity is correct from amp to speakers. Are you running all aftermarket wire to the components or are you using part of the factory wiring in the vehicle? Please give some more specifics......Thanks

[dustyk]

Ah, my bad. It's a Jensen Power760 bridgeable, 2ohm stable, 2/3/4 channel amp offering 100Wx4@2ohm, 75Wx4@4ohm, or 190Wx2@4ohm. I was using aftermarket 12ga wire on everything and nothing was in reverse polarity..

At the time the speakers died, the whole setup was running 1/2 stereo and 3/4 as bridged mono. It looked something like this:

Channel one: running 100W@2ohm to two 65W Rockford P1693s in parallel for 2ohm load.

Channel two: the disasterous setup of serial daisy chaining all the speakers in the front of the car.. impedence unknown.

Channels three/four: bridged, running a 200W Blaupunkt 12" sub at 4ohm.

...I don't know what went wrong. Provided I had everything serialized like that, e.g.
amp(+) --- woofer(+) --- woofer(-) --- amp(-)

would the introduction of the tweeters, which have 33uF/12.5k crossovers, have caused a power distribution error? I've got a good *conceptualization* of how crossovers change their impedence at different frequencies to allow/dissipate more power, but no practical experience with them.