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#1
Posted to rec.audio.car
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Grounding..
I know I've written about this before somewhere but can someone set the
record straight. How can I ground my amp well. I have greased the ground tab with bicycle grease and sanded then cleaned the area with water, then dryed it will a paper towel under the bracket of the passenger seat of my car. Then bolted it down. The reason that I ask is that I have an SPLX SPLA-450 450watt amp. It makes this hissing sound when I have it on low volume. I have 4 speakers connected to it even though its a 2 channel amp. Please help Dan |
#2
Posted to rec.audio.car
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Grounding..
wrote in message oups.com... I know I've written about this before somewhere but can someone set the record straight. How can I ground my amp well. I have greased the ground tab with bicycle grease and sanded then cleaned the area with water, then dryed it will a paper towel under the bracket of the passenger seat of my car. Then bolted it down. The reason that I ask is that I have an SPLX SPLA-450 450watt amp. It makes this hissing sound when I have it on low volume. I have 4 speakers connected to it even though its a 2 channel amp. Please help Dan It sounds like you have the amp gains turnes all the up. |
#3
Posted to rec.audio.car
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Grounding..
e-nigma wrote:
wrote in message oups.com... I know I've written about this before somewhere but can someone set the record straight. How can I ground my amp well. I have greased the ground tab with bicycle grease and sanded then cleaned the area with water, then dryed it will a paper towel under the bracket of the passenger seat of my car. Then bolted it down. The reason that I ask is that I have an SPLX SPLA-450 450watt amp. It makes this hissing sound when I have it on low volume. I have 4 speakers connected to it even though its a 2 channel amp. A chain is only as strong as its weakest link, and a ground is only as clean as its worst connection. No matter how good you make the amp ground, if the battery ground to the body/chassis isn't solid, you won't get a good connection. It sounds like you have the amp gains turnes all the up. Yup... in which case you're greatly amplifying ANY noise coming from the deck or the interconnect wiring. |
#4
Posted to rec.audio.car
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Grounding..
To help get a better ground run a short length of 8 gauge ground wire from
the negative battery post to the car chassis. This helps quite a bit as the usual factory grounding to the engine block leaves a lot to be desired. And then, as suggested in the other replies, set your amp gains up properly. They should not be near max unless your HU has very weak output at the RCA's. - RG wrote in message oups.com... I know I've written about this before somewhere but can someone set the record straight. How can I ground my amp well. I have greased the ground tab with bicycle grease and sanded then cleaned the area with water, then dryed it will a paper towel under the bracket of the passenger seat of my car. Then bolted it down. The reason that I ask is that I have an SPLX SPLA-450 450watt amp. It makes this hissing sound when I have it on low volume. I have 4 speakers connected to it even though its a 2 channel amp. Please help Dan |
#5
Posted to rec.audio.car
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Grounding..
To help get a better ground run a short length of 8 gauge ground wire from
the negative battery post to the car chassis. This helps quite a bit as the usual factory grounding to the engine block leaves a lot to be desired. And then, as suggested in the other replies, set your amp gains up properly. They should not be near max unless your HU has very weak output at the RCA's. - RG This is good advice. Another little trick I always do is run a 12 guage wire between your HU chassis (or HU ground) to your amp ground. This will help ensure you do not have any ground loop issues (that will cause alternator whine) between your HU and amp. MOSFET |
#6
Posted to rec.audio.car
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Grounding..
RG wrote:
To help get a better ground run a short length of 8 gauge ground wire from the negative battery post to the car chassis. This helps quite a bit as the usual factory grounding to the engine block leaves a lot to be desired. Yup, that's what I'm talking about, upgrading the battery/chassis ground. A lot of cars make their main ground cable from the battery to the engine block, because it has to return the starter current, but then they use only a very small connection from the block to the chassis, and/or sometimes a small wire from the battery negative to the chassis (my Accord by default had 14ga. for both!)... but if you're running an 8ga. power wire (and your amp actually uses that much current), you need at least an 8ga. ground for proper performance as well. Remember that when the car is running, you're actually getting your power from the *alternator*, not the battery, so you need to make sure you have a good ground between the *block* and the chassis. If there's already a good ground between the block and battery, you can get away with just improving or adding a ground wire from battery to chassis. For best results, upgrade *both*. Watch what you connect to on the block, BTW... friend of mine connected the block/chassis wire to one of the valve-cover bolts on his older Civic and couldn't figure out why it didn't work right: the vavle cover is isolated by the block by a rubber gasket, and the studs/nuts by rubber-lined washers. And do put the same care into cleaning off and providing a solid ground point on the body/chassis, that you did with grounding the amp itself. then, as suggested in the other replies, set your amp gains up properly. They should not be near max unless your HU has very weak output at the RCA's. Ditto! - RG wrote in message oups.com... I know I've written about this before somewhere but can someone set the record straight. How can I ground my amp well. I have greased the ground tab with bicycle grease and sanded then cleaned the area with water, then dryed it will a paper towel under the bracket of the passenger seat of my car. Then bolted it down. The reason that I ask is that I have an SPLX SPLA-450 450watt amp. It makes this hissing sound when I have it on low volume. I have 4 speakers connected to it even though its a 2 channel amp. Please help Dan |
#7
Posted to rec.audio.car
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Grounding..
Cheers Guys.
Very good advice. I thought that my amp might be crap and thats why it keeps on making sounds, for example when i play a cd and change track you can here the laser moving inside, as though that sound is being amplified. cheers dan |
#8
Posted to rec.audio.car
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Grounding..
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#9
Posted to rec.audio.car
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Grounding..
In article stc4h.274192$1T2.186208@pd7urf2no, Matt Ion wrote:
wrote: Cheers Guys. Very good advice. I thought that my amp might be crap and thats why it keeps on making sounds, for example when i play a cd and change track you can here the laser moving inside, as though that sound is being amplified. That's likely a grounding problem, possibly a ground loop. If improving/upgrading the grounds doesn't work, visit a local car audio shop and ask if you can test a ground-loop isolator - they normally run arounf $25-$35 but most shops will be glad to let you try on first to be sure that'll fix it before you buy one. $17 at Rat Shack. greg |
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