feint radio sound thru fl speaker

[joltx]

Ok heres the story i recently hooked up a seprete amp to drive my 2 front speakers in my home theater set up. Worked great last night but this morning even with the volume turned all the way off there is an annoying feint staticy radio playing thru the tweeter. do you guys think its the amp and if it is wat can i do to fix it and should i be worried will it ruin my speaker.

 

[jinjuku]

What amp is it? You are picking up RFI.

How are your cables routed? How short are the runs?

 

[joltx]

is an old amp from like 1979 nikko alpha 1 i have an rca jack into the pre out front and left and the speaker wire in the back of the amp what do you mean by how long is the run

 

[jinjuku]

is an old amp from like 1979 nikko alpha 1 i have an rca jack into the pre out front and left and the speaker wire in the back of the amp what do you mean by how long is the run

How long is the RCA cable?

When you say through the tweeter: Do you mean just ONE tweeter or both?

 

[joltx]

the rca cable is preety long with lots of extra ft. and its coming out of the front left speaker only

 

[jinjuku]

the rca cable is preety long with lots of extra ft. and its coming out of the front left speaker only

Switch the RCA cables on the back of the amp and check right speaker now for the sound.

 

[joltx]

what do u mean switch them geta diff cable, or change the polarity ?

 

[jinjuku]

what do u mean switch them geta diff cable, or change the polarity ?

Take the RCA going into the RIGHT channel of the amp and switch it with the left.

You can't change the polarity on and RCA cable. They are monaural by design.

 

[joltx]

sorry im a noob but, i only have one rca cable red and white ends into my onkyo reciever in the pre out area for fl and fr speaker i dont know what u mean by changing from right to left , do u mean put the red where the white is and vice versa , sorry i keep bothering u with such little things lol

 

[jinjuku]

sorry im a noob but, i only have one rca cable red and white ends into my onkyo reciever in the pre out area for fl and fr speaker i dont know what u mean by changing from right to left , do u mean put the red where the white is and vice versa , sorry i keep bothering u with such little things lol

You got it. On the amp swap the positions.

 

[joltx]

ok i tried that but radio still comes from the left speaker

 

[TLS Guy]

ok i tried that but radio still comes from the left speaker

That is because the radio is picked up by he speaker leads and fed back through the negative feedback of the amp. This was a huge problem with amps from the seventies.

You solution is an RF choke in the speaker lead +ve terminals at the back of the amp, not the speaker end.

You need a low resistance choke, not a cheap Rat Shack one.

One like this HC1536W. You will need two of them.

 

[jinjuku]

If he has a long RCA run coiled up that 'could' be the culprit.

How long are the cables?

 

[TLS Guy]

If he has a long RCA run coiled up that 'could' be the culprit.

How long are the cables?

It could but speaker leads are much more common. He can tell by just unplugging the RCA leads and seeing if he still has the noise.

 

[joltx]

ok il try to pull the rca cable and see what happends im hopeing thats all it is. i noticed i had it dangling in the air over the speaker wire and since i lowered it to the floor it got quieter but is still there the radio noise. yes the rca is coiled on the floor i would say its about 20 ft maby or 15

 

[joltx]

i unplugged the rca from the amp and the radio went away but of course no sound lol

 

[TLS Guy]

i unplugged the rca from the amp and the radio went away but of course no sound lol

Then make up or buy cables of good build quality, that are the correct length.

 

[joltx]

yea i i guess that may be it i didnt know it matterd i used one that i had in my draw , do u think that is the problem?

 

[TLS Guy]

yea i i guess that may be it i didnt know it matterd i used one that i had in my draw , do u think that is the problem?

Of course its the problem, you just proved it!

 

[highfigh]

What amp is it? You are picking up RFI.

How are your cables routed? How short are the runs?

Switch it to tuner and see if it's set to the same channel. If it was, you have bleed-through. Clean your controls and switches.