Best ground point(s) in Gen8 - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 15 Old 06-18-2012, 01:44 PM Thread Starter
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Best ground point(s) in Gen8

I'm trying to figure out where the best ground points are near the trunk and back seats. My audio shop grounded my amp on the trunk floor, right behind the back seat, under the rear deck. I actually sanded away as much paint as I could at the contact point. I still get engine whine. I'm only running one amp off the OEM HU.

I don't plan to do the "big 3" wiring because I'm only using 1 amp and it's low power (80W x 2 RMS). I've seen YouTube videos of guys/shops grounding amps at bolts in the trunk, which they say is directly contacting the chassis of the car. In my sedan, I don't see any obvious bolts to ground to. I'm thinking of maybe using the bolt that secures the rear seat, but it's just an idea. I am also thinking of running the ground all the way back to the engine bay, which have good ground points, but people say the ground wire shouldn't be long though. any ideas?

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post #2 of 15 Old 06-18-2012, 05:10 PM
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Brand and model of the amp? I can almost guess where the actual problem lies.


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post #3 of 15 Old 06-18-2012, 05:25 PM Thread Starter
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Brand and model of the amp? I can almost guess where the actual problem lies.
A 15-yr-old MTX Thunder 280 amp, lol. I know, I know, I'm in the process of getting a new amp. But I called a Crutchfield tech about the noise, he said it's most likely not the amp, but the wiring/grounding. I was a bit surprised because I was expecting him to be like, "Yeah, it's the amp. Let me recommend some of our amps for you to buy, etc."

My current ground point doesn't look like the best anyways. It's totally sanded off, but the metal looks like a piece that is welded to the frame, not the actually chassis, itself. So I hope to find a better ground point. I just don't want to rush to get a new amp and have the same noise. I'd like to fix any wiring issue first, if it is the real culprit.
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post #4 of 15 Old 06-18-2012, 07:30 PM
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The reason I ask is that if you're using an amp without balanced inputs, you will get noise from the factory HU no matter what. More than likely your amp doesn't fall into that category. It's well worth looking for that feature when buying a new amp though.

My amps are grounded to a bolt behind the back seat (where you fold it down and pull up the cloth to see the metal... one of those screws.

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post #5 of 15 Old 06-18-2012, 10:24 PM Thread Starter
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The reason I ask is that if you're using an amp without balanced inputs, you will get noise from the factory HU no matter what. More than likely your amp doesn't fall into that category. It's well worth looking for that feature when buying a new amp though.

My amps are grounded to a bolt behind the back seat (where you fold it down and pull up the cloth to see the metal... one of those screws.
Thanks for the "balanced inputs" advice. I'm browsing amps online, and I'm trying to find that feature. What brands do you know of that have this feature? And any chance you can take a pic of the general area/bolt that you grounded to?
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post #6 of 15 Old 06-18-2012, 10:40 PM
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Originally Posted by kalel34 View Post
A 15-yr-old MTX Thunder 280 amp, lol. I know, I know, I'm in the process of getting a new amp. But I called a Crutchfield tech about the noise, he said it's most likely not the amp, but the wiring/grounding. I was a bit surprised because I was expecting him to be like, "Yeah, it's the amp. Let me recommend some of our amps for you to buy, etc."

A little off topic a bit, I have to say that the Crutchfield support is really great at being helpful and not trying to make a sale. During the last 2 months of doing my research with upgrading my audio system, I have log onto to their chat many times to ask questions and they've never tried to pitch me a sale unless I asked for a suggestion on a product and even they've never pushed.

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post #7 of 15 Old 06-19-2012, 05:32 AM
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Originally Posted by kalel34 View Post
Thanks for the "balanced inputs" advice. I'm browsing amps online, and I'm trying to find that feature. What brands do you know of that have this feature? And any chance you can take a pic of the general area/bolt that you grounded to?
Rockford Fosgate (not sure which models)

Kicker (check models)

JL Slash/XD/HD

Alpine PDX

if I have time this evening I'll get a pic.

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post #8 of 15 Old 06-23-2012, 03:08 PM
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Originally Posted by kvndoom View Post
Rockford Fosgate (not sure which models)

Kicker (check models)

JL Slash/XD/HD

Alpine PDX

if I have time this evening I'll get a pic.
Sorry don't mean to jack this thread...but would you know if the Kicker 750.1 mono block amp has the balanced ones? Thanks.

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post #9 of 15 Old 06-25-2012, 10:31 PM Thread Starter
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Rockford Fosgate (not sure which models)

Kicker (check models)

JL Slash/XD/HD

Alpine PDX

if I have time this evening I'll get a pic.
Thanks for the info, Kvn. I looked into KICKER's "FIT" technology, reducing alternator noise. Their amps seem to be the best wattage per dollar. I might try KICKER this time around.
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post #10 of 15 Old 06-28-2012, 10:06 AM Thread Starter
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Just wanted to add...I'm thinking of running the ground wire from the amp (attached to the rear seat) and grounding it to the front strut area. I know people say to keep the ground wire as short as possible, but at least the strut area would be a true chassis ground. Any thoughts on that?
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post #11 of 15 Old 06-28-2012, 03:58 PM
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Hell in my last car I ran positive AND negative wires all the way from the rear hatch to the battery terminals. Never had an issue. Wasn't necessary, but I had the extra wire, and the car was already apart, so why not?

I think all Kicker amps have noise isolation, but don't quote me on that. Best thing to do is check their website.

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post #12 of 15 Old 07-18-2012, 12:07 PM
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Originally Posted by Aelayyat View Post
Sorry don't mean to jack this thread...but would you know if the Kicker 750.1 mono block amp has the balanced ones? Thanks.
I don't believe the HU requires a balanced input for the Sub channel. I have an MBquart for my sub and it doesnt have a balanced input. It works fine. I HAD a 4 channel MBquart without balanced inputs, BIG noise problem. Upgraded to the Kicker ZX650.4 and now I'm loving life with crisp clear sound!

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post #13 of 15 Old 07-18-2012, 02:39 PM Thread Starter
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I don't believe the HU requires a balanced input for the Sub channel. I have an MBquart for my sub and it doesnt have a balanced input. It works fine. I HAD a 4 channel MBquart without balanced inputs, BIG noise problem. Upgraded to the Kicker ZX650.4 and now I'm loving life with crisp clear sound!
Glad to hear that you're noise free, which makes me want to get a new amp even more now. I'm definitely looking at the KICKER amps, but I thought only the DX models have the noise suppression feature?
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post #14 of 15 Old 07-19-2012, 04:59 AM
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It is not so much as a noise suppresion feature, I had differential balanced outputs going to unbalanced inputs with the other amp. That caused the noise.
Our premium head units use balanced outputs prior to the amp, and the Kicker, along with several other brands, offer amps with balanced inputs. That is what you need to look for when purchasing. It appears that the DX and ZX series of Mono Block Sub Amps from Kicker offer Balanced inputs, the IX series doesn't list that as a feature.
Most amps offer some type of noise suppression.

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post #15 of 15 Old 07-19-2012, 08:51 AM Thread Starter
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Originally Posted by Doolie77 View Post
It is not so much as a noise suppresion feature, I had differential balanced outputs going to unbalanced inputs with the other amp. That caused the noise.
Our premium head units use balanced outputs prior to the amp, and the Kicker, along with several other brands, offer amps with balanced inputs. That is what you need to look for when purchasing. It appears that the DX and ZX series of Mono Block Sub Amps from Kicker offer Balanced inputs, the IX series doesn't list that as a feature.
Most amps offer some type of noise suppression.
Thanks again, Doolie. I'm not familiar with the differential balanced technology, but it looks like it will be necessary when running an amp off the OEM HU. I still plan to amp off my OEM radio, so it looks like I definitely have to get an amp like yours.

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