I recently wired an electronic SSF filter to my ampand now when I change songs or inset a cd it sound like I can hear the cd motor running through my sub.(kinda sounds like a heartbeat). Once the song starts playing it goes away or the music overpowers it.
I tapped into the power, ground and rem wire off my amp (place where I bought the ssf said this would be ok). Since I am using the same ground that could be causing a ground loop right? When i get time i am going to ground the filter to its own separate ground but what I'd like to know is would this cause any damage to the amp or ssf running it like this until I get a chance to fix it?
Thanks,
Jay
Replies (4)
P0werLifter on 09/21/2004 22:24:06
What type of SSF filter is this? the brand name, model ect? Im havnt really heard much about electronics SSF's. Most people i know run the harrison labs SSF from thezeb.com if they dont have one on their amplifier.
When you get a chance try to run the unit its own power, and ground instead of tapping it into the amplifiers leads.
-Jason
swez on 09/22/2004 11:32:24
This may have more to do with gain structure of the SSF, CD player and amp. Does this SSF have a gain control as well? If so, dial back on the gain a few clicks and see if that makes a difference.
Also, what is the output voltage of the SSF? If it is fixed or variable, match the output voltage (SSF) to the amp input gains. Worst case, a 1:1 isolation transformer/noise filter should block any noise riding on the amplification chain. Any noise present on all RCA lines to amp will be amplified as well as audio signal. The trick here, is to lower the noise threshold, well below signal voltage coming form the audio source.
Finally, is the CD player grounded properly to the chassis or body ground? If using the OEM ground as source ground, this may create a ground loop problem too. Better to ground the CD player to body/chassis ground... NOT OEM HARNESS GROUNDING WIRE.
Swez
LC1 on 09/22/2004 20:10:07
Actually this particular ssf does not have a gain settinng, just a power,rem,ground and rca in and out. It is an older HiFonics ssf(not sure on the model number at the moment). The reason why I know it has to be the ssf causing the noise thru my sub is because I have had the sub and amp for about 5mths and as soon as I hooked up the ssf that was the first thing I noticed.
Also my HU is grounded to the body/chassis of the car.
When I get the model number of the SSF I will let you guys know what it is. I looked for HiFonics ssf filters online and I couldnt find anything. The box actually says its a high pass filter at 35hz, which is basically a ssf. I got it for 20 bucks from a guy i know who owns a car audio shop here and he said if there is anything major wrong with it being such an older piece he would take it back from me.
`Jay
swez on 09/22/2004 20:30:22
Hummmm, sounds like you have covered all th bases here. The only thing I can suggest is to test that SSF with another system and see if you get the same results. If yes, something is wrong in this SSF unit.
I would point to a power supply problem with a bad filtering cap as the culprit. This is especially possible if the unit is pretty old... 3 years or more.
If you cannot solve the problem by trial and error troubleshooting, take it back and just use F-Mods for your SSF filtering needs.
Swez
I tapped into the power, ground and rem wire off my amp (place where I bought the ssf said this would be ok). Since I am using the same ground that could be causing a ground loop right? When i get time i am going to ground the filter to its own separate ground but what I'd like to know is would this cause any damage to the amp or ssf running it like this until I get a chance to fix it?
Thanks,
Jay
Replies (4)
P0werLifter on 09/21/2004 22:24:06
What type of SSF filter is this? the brand name, model ect? Im havnt really heard much about electronics SSF's. Most people i know run the harrison labs SSF from thezeb.com if they dont have one on their amplifier.
When you get a chance try to run the unit its own power, and ground instead of tapping it into the amplifiers leads.
-Jason
swez on 09/22/2004 11:32:24
This may have more to do with gain structure of the SSF, CD player and amp. Does this SSF have a gain control as well? If so, dial back on the gain a few clicks and see if that makes a difference.
Also, what is the output voltage of the SSF? If it is fixed or variable, match the output voltage (SSF) to the amp input gains. Worst case, a 1:1 isolation transformer/noise filter should block any noise riding on the amplification chain. Any noise present on all RCA lines to amp will be amplified as well as audio signal. The trick here, is to lower the noise threshold, well below signal voltage coming form the audio source.
Finally, is the CD player grounded properly to the chassis or body ground? If using the OEM ground as source ground, this may create a ground loop problem too. Better to ground the CD player to body/chassis ground... NOT OEM HARNESS GROUNDING WIRE.
Swez
LC1 on 09/22/2004 20:10:07
Actually this particular ssf does not have a gain settinng, just a power,rem,ground and rca in and out. It is an older HiFonics ssf(not sure on the model number at the moment). The reason why I know it has to be the ssf causing the noise thru my sub is because I have had the sub and amp for about 5mths and as soon as I hooked up the ssf that was the first thing I noticed.
Also my HU is grounded to the body/chassis of the car.
When I get the model number of the SSF I will let you guys know what it is. I looked for HiFonics ssf filters online and I couldnt find anything. The box actually says its a high pass filter at 35hz, which is basically a ssf. I got it for 20 bucks from a guy i know who owns a car audio shop here and he said if there is anything major wrong with it being such an older piece he would take it back from me.
`Jay
swez on 09/22/2004 20:30:22
Hummmm, sounds like you have covered all th bases here. The only thing I can suggest is to test that SSF with another system and see if you get the same results. If yes, something is wrong in this SSF unit.
I would point to a power supply problem with a bad filtering cap as the culprit. This is especially possible if the unit is pretty old... 3 years or more.
If you cannot solve the problem by trial and error troubleshooting, take it back and just use F-Mods for your SSF filtering needs.
Swez
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