recommend amp
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95342
Printed Date: April 26, 2024 at 8:38 PM
Topic: recommend amp
Posted By: NHxj4x4
Subject: recommend amp
Date Posted: July 04, 2007 at 11:02 PM
Guys,
OK, I punked out and went cheap and am not happy. I got a Boss (flame suit on) GT980 5 channel amp that is suppose to do 80x4 and 150x1 for RMS. With the speaker wire run (12ga Stinger) and without the interconnects even hooked up yet (just my subs, which are Infinity perfects) the rear speakers hiss like mad. Before you ask, yes it is the amp, I disconnected it to test, hiss went away. So here is what I am running in a nutshell:
Front: Fosgate 6.5" T162c Rated 75w rms
Midbass: Kicker 6.5" SSMB6 Rated 125w rms
Rear: Kicker 6x9" KS693 Rated 90w rms
Subs: Infinity Perfect 10d (2 in ported box)
I was looking around and came across the Infinity 5760a 6ch amp, rated at 56x4 and 107x2 rms. I guess my question is would the 56w from the 4ch be enough to run my fronts and rears rated at 75w and 90w? I know the 107w is just fine for the mid-bass. Any other thoughts on Ifinity amps? I'm trying to save trunk space and get a unit that can handle all 6 channels, and just keep the same amp for my subs which I am happy with.
Any help would be great.
Todd
Replies:
Posted By: DYohn
Date Posted: July 05, 2007 at 10:23 AM
The Infinity amp is a much better product than anything from Boss. it should work just fine for you. ------------- Support the12volt.com
Posted By: NHxj4x4
Date Posted: July 05, 2007 at 10:29 AM
Well I hooked the rest (fronts and mids) to that Boss amp, and WHOA, the alternator noise is in a class on it's own. Anything below 3/4 volume it's like I'm listening to nothing but my alternator. I assume that the amp is entirely to blame for this, BUT is there something else I should also be checking?
I'm going to order the Infinity 5706a today I think. After all this work I did for the system to sound like this is really a bummmer.
Todd
Posted By: xtremej
Date Posted: July 05, 2007 at 10:51 AM
although its a crappy amp, poor ground, poor rca's, remember the amp "amplify's what is sent via signal" What kind of head unit are you using as they may also be a source of noise?
Posted By: NHxj4x4
Date Posted: July 05, 2007 at 11:39 AM
xtremej wrote:
although its a crappy amp, poor ground, poor rca's, remember the amp "amplify's what is sent via signal" What kind of head unit are you using as they may also be a source of noise?
HU is a Pioneer Premier DEH-P980BT. This has been in 3 cars, same RCA's, same everything really (well not the speakers) and has never made a peep alternator wise. I'm thinking it might be the amp.
Posted By: xtremej
Date Posted: July 05, 2007 at 12:15 PM
Try it, then you'll know.
Posted By: dwarren
Date Posted: July 05, 2007 at 12:17 PM
NHxj4x4 wrote:
xtremej wrote:
although its a crappy amp, poor ground, poor rca's, remember the amp "amplify's what is sent via signal" What kind of head unit are you using as they may also be a source of noise?
HU is a Pioneer Premier DEH-P980BT. This has been in 3 cars, same RCA's, same everything really (well not the speakers) and has never made a peep alternator wise. I'm thinking it might be the amp.
Where do you have the amp mounted? I have had issues with low quality and even high quality amps picking up noise due to mounting locations, such as bare metal on the car. -------------
Posted By: NHxj4x4
Date Posted: July 05, 2007 at 1:05 PM
dwarren wrote:
NHxj4x4 wrote:
xtremej wrote:
although its a crappy amp, poor ground, poor rca's, remember the amp "amplify's what is sent via signal" What kind of head unit are you using as they may also be a source of noise?
HU is a Pioneer Premier DEH-P980BT. This has been in 3 cars, same RCA's, same everything really (well not the speakers) and has never made a peep alternator wise. I'm thinking it might be the amp.
Where do you have the amp mounted? I have had issues with low quality and even high quality amps picking up noise due to mounting locations, such as bare metal on the car.
In the trunk, mounted to a wooden subfloor, covered in carpet. Ground wire is attached to one of the rear seat seat belt bolts, to 3farad cap, to Stinger distribution block to amps. Power 4ga attached to battery, fused, run through firewall, down drivers side, to 3farad cap, to stinger distribution block, to the amps.
Posted By: DYohn
Date Posted: July 05, 2007 at 1:10 PM
NHxj4x4 wrote:
Ground wire is attached to one of the rear seat seat belt bolts, .
This could be your problem. Seat belt bolts are a very poor location to ground an amplifier since they are generally hardened steel and bolt into nuts that are welded to the unibody. Try a better ground location, such as drilling your own bolt mounting location with all paint scrapped off and using star washers. ------------- Support the12volt.com
Posted By: NHxj4x4
Date Posted: July 05, 2007 at 1:25 PM
DYohn] wrote:
NHxj4x4 wrote:
Ground wire is attached to one of the rear seat seat belt bolts, .
This could be your problem. Seat belt bolts are a very poor location to ground an amplifier since they are generally hardened steel and bolt into nuts that are welded to the unibody. Try a better ground location, such as drilling your own bolt mounting location with all paint scrapped off and using star washers.
I'll try to find another place to do this, but I'm not sure about drilling my own hole in a lease, we'll see. To be honest I have always used the seat belt bolt, never thought twice about it, always gotten a good tone with the multimeter there. I'll take the carpet off the sides of the trunk and see if there are any lips that I can drill, I just want to make sure I don't hit anything, and don't open it to the outside. I would assume that any metal I can find is OK regardless of the gauge or metal?
Posted By: xtremej
Date Posted: July 05, 2007 at 2:01 PM
fyi, just because the multi meter gives you a beep indicating a ground doesn't consitute a "quality" ground, it may work but not as well as it could or should. I would read the stick on a proper ground. You can also use self tapping screws with star washers, juts make sure to shoot atleast 1 more screw overlapping the the main screw to ensure it does not loosen up with time/vibrations. Also just shoot it under the carpet close as possible to the amp, make sure your are also using as big as or bigger than your power cable gauge for the ground. I doubt they will find a self tapping screw at lease turn in time, we have done plenty this way with out issue.
Posted By: NHxj4x4
Date Posted: July 05, 2007 at 2:17 PM
xtremej wrote:
fyi, just because the multi meter gives you a beep indicating a ground doesn't consitute a "quality" ground, it may work but not as well as it could or should. I would read the stick on a proper ground. You can also use self tapping screws with star washers, juts make sure to shoot atleast 1 more screw overlapping the the main screw to ensure it does not loosen up with time/vibrations. Also just shoot it under the carpet close as possible to the amp, make sure your are also using as big as or bigger than your power cable gauge for the ground. I doubt they will find a self tapping screw at lease turn in time, we have done plenty this way with out issue.
Right, but I'd get some kinda bummed if I plinked the gas tank =)
I'm going to order the Infinity as well, I found it on clearance for $139 with a factory Infinity warranty. I'd have 30days to return it at least if I end of liking this BOSS POS.
Posted By: xtremej
Date Posted: July 05, 2007 at 2:27 PM
No you wouldn't feel anything------- BOOM!!!! Ha Ha, just use 1/4" self tappers, and do a visual on where you intend to screw them in.
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