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strange amp/sub problem

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Old Jun 18, 2003 | 11:58 PM
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strange amp/sub problem

i put a 200 watt jenson amp/10'' sub in today, and all i get is a really loud noise (feedback?) what gives? it was working before i drove it, so i'll check my wiring again. i tapped into the rear left speaker and ran it into the low inputs on the amp but it wasn't very loud for some reason. anyone know a better way without buying any adapters or any of that b.s.? its a 95 se w/bose. thanks
Old Jun 19, 2003 | 04:03 PM
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More info please. Could be a ground loop, could be a lot of things.
Old Jun 20, 2003 | 01:47 AM
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If you tapped off a speaker wire you can only hook it to the high input. Low input would be RCA's.
Old Jun 20, 2003 | 09:17 AM
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Originally posted by thomasd cook
If you tapped off a speaker wire you can only hook it to the high input. Low input would be RCA's.
If he used audio linx he can use rca's.
Old Jun 20, 2003 | 10:38 AM
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i just spliced the rca's into the speaker wire. now i get a lot of wierd background noise and i'm not sure what to do about it
Old Jun 20, 2003 | 11:05 AM
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normally you have to place resistors on the speaker wire when directly splicing rca's in to reduce voltage.
Old Jun 20, 2003 | 12:22 PM
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u can't splice the speaker wires with rca's thats signal is too weak and the current ur sendin the amp is not the right kind, do it the right way get a line out converter and splice into the speakers wires with that. the loud sound is feed back, do u only get it when the system is off?
Old Jun 20, 2003 | 12:25 PM
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and plus the bose headunit only supplies very minimal sound due to the fact that the amps are supplying all the power. to get the power they run 1 ohm resistance to those amps and pull out the 50w per channel that way, using those signals to ur amp is not going to work because of this
Old Jun 20, 2003 | 03:15 PM
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Originally posted by nismos14
u can't splice the speaker wires with rca's thats signal is too weak and the current ur sendin the amp is not the right kind, do it the right way get a line out converter and splice into the speakers wires with that. the loud sound is feed back, do u only get it when the system is off?
I second this. You CANNOT splice speaker wires into RCA's. Will not happen.
Old Jun 20, 2003 | 10:35 PM
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can someone please explain how to get a signal the right way (as cheaply as possible), thanks
Old Jun 20, 2003 | 11:10 PM
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does the jensen have high level inputs? (direct speaker wire connections) for signal?
Old Jun 20, 2003 | 11:21 PM
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If your amp has high level imputs such as speaker wires you have to sacrifice your front or rear speakers in order to feed a signal to your amp. You can maybe run your wires in series to try and keep both pairs playing with amp. But you also run the risk of frying your head unit due to the impedance change from adding the signal to the amp. See if your amp has high inputs if not then you need an FM modulator to convert your speaker wires into a RCA signal. You cannot splice speaker wires into RCA's, that is what the FM modulator does.
Old Jun 21, 2003 | 05:18 AM
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i have high level inputs, but i have a p.o.s. jenson amp that needs an adapter just to hook up the high inputs. how much do fm modulators run?
Old Jun 21, 2003 | 07:40 AM
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thomasd u are mistaken, u can run the wires from the speakers to the amp AND still use those wires on the speakers, i've dont it many many times with no ill effects. it is only reading the signal from the wires there fore. the amp itself transforms the signal into higher level of sound in order to make the amp sound proper.am FM modulator is for a cd changer lol u need a line output converter, but that does the same thing as high level inputs
Old Jun 21, 2003 | 08:05 AM
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Originally posted by ChrisBannon84
i just spliced the rca's into the speaker wire. now i get a lot of wierd background noise and i'm not sure what to do about it
What would possess you to do that???

Originally posted by ChrisBannon84
can someone please explain how to get a signal the right way (as cheaply as possible), thanks
Option 1:Go to Walmart and buy a line-level converter for $10. Drop the amp from the rear-left speaker and tap the inputs of the converter into the wires that go from the amp to the speaker itself.(You can tap the left and right inputs into that one speaker. low freqs are not really directional, so it will sound fine) Then, run a set of RCAs from the converter to the amp.

Option 2: Use your high-level inputs. This works the same way as above, only without the line-level converter. Amps with a high-level input have the line-level converter built into it. just tap the high level inputs into the wires that run from the amp(yes, that black thing) to the speaker(the cone itself).

That should work for you. Any ?s, feel free to PM me.
Old Jun 21, 2003 | 11:57 AM
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Originally posted by nismos14
thomasd u are mistaken, u can run the wires from the speakers to the amp AND still use those wires on the speakers, i've dont it many many times with no ill effects. it is only reading the signal from the wires there fore. the amp itself transforms the signal into higher level of sound in order to make the amp sound proper.am FM modulator is for a cd changer lol u need a line output converter, but that does the same thing as high level inputs
That's what I meant a line output converter you're right I don't know why I said FM modulator. Also I'm not sure how much of a draw high level inputs would take to get a signal. My experience with tapping wires is always bad so I try to do it the unrigged way to avoid problems. Not saying it's rigged but wires are still being tapped and my experience with doing stuff like that results in problems.
Old Jun 21, 2003 | 03:43 PM
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Originally posted by thomasd cook

That's what I meant a line output converter you're right I don't know why I said FM modulator. Also I'm not sure how much of a draw high level inputs would take to get a signal. My experience with tapping wires is always bad so I try to do it the unrigged way to avoid problems. Not saying it's rigged but wires are still being tapped and my experience with doing stuff like that results in problems.
oh i get ya now seems like we're both very interested in audio and we both think along the same lines good stuff, and yea i guess its true the rigged way doesnt work quite as well all the time, but i've never had problems with it
Old Jun 21, 2003 | 10:10 PM
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alright take it easy, i'm not completely car audio illiterate, i just had a disposable amp/sub and took 5 minutes to "rig" it. i've never dealed with a head unit w/out rca outs. but does anyone know the layout of a jenson amp's high level input? there are six pins so i'd like to at least have an idea which ones to try thanks
Old Jun 22, 2003 | 08:38 AM
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uhhh get some pics of it the 6 pins? probably require some sort of adaptor
Old Jun 22, 2003 | 09:17 AM
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get a line-level converter and make it easy on yourself
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