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hello i have a kicker 08750.1 amp running to that i have 2 kicker cvr's 2 ohm 12 inch subs they are runing at 2 ohms......they sound pretty good,my problem is that when i change the song i get this rumbling noise.....i have tried moiving the ground cable ...and i made it shorter too....i had an infinity amp before i got this kicker and it never made any noise......but the music poundsss!!!!with the kicker....could the amp b faulty?????or maybe it could still be my ground connection????? any thoughts or advice would be greatly appreciated.....thankz for reading Replies (25) swez on 02/2/2009 10:45:35 With the system turned off, remove the RCA cables from the input side of the amp and see if you hear the noise. If yes, your amp is doing something strange and needs to be looked at by a qualified repair tech or returned for a swap if under warranty. Also, try adjusting the amp gain up by 1/2 volts from present setting and see if that changes things. If no noise when your RCA's are removed, the noise is probably coming from your HU. What HU make and model are you using here? Swez ttocs on 02/2/2009 14:43:35 what is the head unit? Where are your gain controls on the amp at? MrBrownstone on 02/2/2009 16:20:46 It's likely the gain control being set too sensitive. If the HU is factory, they are quite noisy and you need to set your gains at a less sensitive level to reduce the noise being picked up by your amplifier. give us all the details on your equipment. Adding a line driver and setting your gain control to a much lower setting may be the cure, but first let's make certain we have all the evidence first. What are you running on your other speakers? HU power or amplified signal. I get this a lot when people run speaker power from their headunit but amplify signal for subwoofers. carlos_14_707 on 02/2/2009 19:37:17 Ok i have jvc kd-g230 hu and i also have a caissxs farad cap.....and the amp and woofers i metinoned before.....the amp has three settings that i can set.... bass boost i can set at 0-18 i had it at 12 _the gain i had it a little over half way up_and a x-over i had that set up to 100 hz_ also i have a bass level control the one you plug into the amp(looks like a phone jack that plugs into the amp..... im sure you all knew that but i just wanna telll you all everything thats going on) that was about a third of the way up.... and like MRBROWNSTONE said i do have the head unit conected to the stock interior speakers and the subwoofers are being amplifed threw the single set of rca output from the head unit....and also SWEZ i did what you said .i took the rca cable off and turned the system on and i got no noise at all.....i turned the gain down to about one quater and that made the sound quieter but i could still hear it.....and also SWEZ im not sure i kno what you mean by turning it up a half volt...if you will explain it to me i will go and try it....thanks for all your responses swez on 02/2/2009 22:18:44 Hey Carlos, Your bass boost is a tad on the high side here. A +12 setting is a lot of boost and that may be part of the problem. In most cases, +3, +6 is plenty of bass boost. When I mentioned gain adjustments, say you have if set at 2.0 volts now. Try a 2.5 volt setting and see if that pulls down the noise. Are the power cable and RCA lines installed on the same side of the car? Swez carlos_14_707 on 02/3/2009 20:17:53 SWEZ ....i changed the bass boost to +6 and the gain to 2 volts.....the noise is barely there but i can still hear it .....and i did have all my wires running together but now the power is on one side and the remote n rca's on the other.....also another question for you.....with the gain down that low it does calm the rumble down but the bass is also way low....like really not loud at all....weak.......is that how it is gonna have to be to keep the rumble away?????thanks for ur advice so far.... swez on 02/3/2009 20:50:05 The bass may be low for now, but I suspect the low pitched rumble may be coming from the HU. Did you ground the HU to the factory ground or to a body ground point? Most aftermarket HU's do wierd things when using the factory ground line. I generally recommend grounding the HU to the floor pan or firewall. (Bare metal location and just add wire to the ground to reach the desired location plus some slack for HU removal) This rumble could be a "ground loop" issue or the amp is more sensitive to noise then your previous amp. Dialing up the amp gain will decrease signal to noise, but the sub may not be as loud either. To counteract that, other tricks and gadgets may need to be explored. #1: Where is that LF noise coming from? It could be the HU, amp or something inside the power line run that is picking up noise. These are not easy things to track down. Say more please, Swez carlos_14_707 on 02/4/2009 00:24:50 the head unit is grounded to the harness i bought to install the stereo without having to cut the cables from the car.... tomarrow i will ground the stereo to the floor pan like you recommend....if you asked me where the sound was coming from i would have to say that it is from the stereo...it happens when ever i change the song on the cd.....i am also running the remote wire with the rca's....could that be affecting them??? ....would that make the rumbling noise....???? another thing.......when i changed the location of the ground wire the amp would not turn on i had to shake it a bit for the amp to turn on......... sorry that the info is kinda scatterd...... swez on 02/4/2009 01:43:38 Same thing there... bare metal too. If you don't get to bare metal, the ground is practically useless. A Remote line on the same side as RCA's is OK. it's 12 volts, but minimal current. (1/3 Ampere max) Hense, not an issue in most cases. Swez carlos_14_707 on 02/6/2009 00:41:08 SWEZ....i grounded the stereo to the floor board of my durango.....acually a metal plate the gas pedal is attached to......im going to have to say that got rid of 95 % of the rumble....is there anything else u can think of to rid me of this damn rumble once and for all???? i was also wondering if you could tell me how to set my amp up for peak output power..... thanks so far tho....really appreciate it.... swez on 02/6/2009 00:57:56 Good Carlos and your on the right track. The next step ir to reground your amp to bare metal where it is installed. (floor pan is good) Once the noise it finally gone, you can readjust the amp gain on your sub amp to mormal levels. This may require some patience and tennacity, but you're on the right track. Swez carlos_14_707 on 02/6/2009 01:25:21 .....i did also pull up my ground on the amp and clean up an sand the area....also i looked at my battery and i noticed that it was grounded to just a peice of sheet metal...is this a good place for it????seems to me the chasis would be beter no????also my ground connection on my battey is loose....i cannot tightn it because the bolt is all messed up......its tight but i managed to wiggle it loose by hand so im thinkin thats probably not helpin my situation..... this week end i am going to buy a new bolt....maybe the whole connection .....and install that.... another thing i was thinking also was to buy a (im not too sure the name of it but its like a thin metal strip with a holes on both ends...that is used for gronding purposes) attach one end to the chasis and drilla hole thru the floor pan attach the amp ground and the strap together with a bolt......do you think that would help.....???? swez on 02/6/2009 08:21:06 Yes, a loose battery terminal is not helping. Tighten that up when you can. Also, the engine block is grounded to the body/chassis via the starter and Alt. That thin wire to the body is just a connection point for light duty relays and accessories. The heavy ground cable does the real work. That perforated metal band is called a grounding strap. They are fine for light duty use, but a thick metal block is better for high current loads. Many guys will use a sanded seatbelt bolt as their main grounding source and use short cables for the amps installed. The nut is welded to the floor pan and generally gives a very good grounding source for Distribution blocks that feed multiple amplifers. There are no fuses in this line. Comments? Swez carlos_14_707 on 02/6/2009 19:20:27 yea ok ima fix the battery connection tomarrow.....and i also have a distribution block for the ground like you mentioned.....i work at a factory were we fabricate glu lam beams....its a big company we have our own machanic shop..... so i asked one of the machanics if he had an extra ground strap.....he did not but wut he did give me was a 1 gauge battery cable with connectors on both ends....i was thinkin of tryin that instead of the ground strap.....what do you think????....at least until i can weld it up like you have mentioned.... swez on 02/6/2009 20:46:41 Na, I cannot see a clean way to use that item without looking Ghetto. It would be good practice to use the D-Block, a short length of #4 gage and connector to a seat belt anchor and then a pair of short #8 ground lines to the D-Block. This is a 5 port Grounding block. Something similar would be fine: http://www.knukonceptz.com/productDetail.cfm?prodID=KND-23 Swez carlos_14_707 on 02/6/2009 21:09:35 the d block i have is RF fits 4 gauge on one end and four 8 gauge on the other end...i have about 6 inces of four gauge wire grounded to a small bolt and a bout 10 inces of 8 gauge running to the amp.... my thought with that cable was to drill a hole threw the floor pan and attach the d block to that hole with a bolt but on the underside of the car....not visible....attach the ground cable that was made to the chasis and the other end to the same bolt the d block is on...... sorry im repeating myself but im thinking that you werent really understanding what i was wanting to do just want to be clear ......thanks for all the help so far tho...... swez on 02/6/2009 22:02:08 I get it and yes, that will be fine with an extra pair of hands under your truck to clean the suface and put a wrench on the lower nut as you torque the D-block into place. Basically, you are creating a sandwich deal with the floor pan, D-block, 2 fender washers an one c-ring washer to stiffen the mounting location and offer a larger grounding surface. That will work. A 1/4" x 20 x 1.5" bolt should be fine. All must be paint free too. Once the unit is installed, coat the under body harware with grease to prevent rust. Swez carlos_14_707 on 02/7/2009 01:37:45 alright...ima do that and repair the battery cable...let you kno how it went .....them hopefully you can guide me thru setting my amp properly.... swez on 02/7/2009 04:23:54 Good nuff. Here's a DIY tip I wrote a while back that tells how to set amp gains. In your case, disregard the part about LOC's. http://www.clubknowledge.com/Car_Audio_FAQ/?t3 Swez carlos_14_707 on 02/8/2009 22:31:20 alright fixed the battery terminal and grounded the d block.....but there is a liitle bit of sound still....no were near as much as before tho....and i still have to set up my amp gains......any other suggestions for the rumble.....????thanks swez on 02/9/2009 01:20:56 Have very few low budget tricks left on this one Carlos. From here on out, the price goes up on your end. Do you hear the noise at all on the FM circuit with breaks in the music or commercials? When you pulled the RCA's out of the amp, the noise was gone right? That rules out amp generated noise. The only 3 things I can think of now are: 1. poor quality RCA's 2. a bad connection RCA ground at the HU 3. the HU has an internal problem on your CD circuit The easiest/no cost of the bunch is to remove the HU and clean your RCA connectors at the rear of this HU. I see a pair of RCA outs in the back of this HU in the manual. A. Pull the HU out with the Neg BAT connection B. Removed and clean the outer metal rings with WD-40 and perhaps a toothbrush C. Then clean the RCA cables from the amp in the same manner D. Install the RCA jacks and use a short length of AWG #20, single strand Copper and strip the insulation (6" is plenty) E. Wrap the outer claw of the RCA's a few wraps and connect the tag end to a chassis screw head on the HU (added ground support) F. Reconnect your BAT and test for noise Yes, all your memory presets may be lost, but reprogram them as needed. If that does not fix the problem, you may be looking for a new HU. Comments/Questions? Swez PS This HU only has 1 pair of RCA Sub outs. They are rated at 2.5 volts max output. The Kicker amp has Speaker Line Level Inputs and you can tap wires off the rear speakers to provide input to this amp if desired. If that makes the noise go away, go that route. carlos_14_707 on 02/9/2009 01:47:45 to tell you the truth i never listen to the radio ....ever....i will listen to it tommarow tho and see what happens......the rca's are R.F also i bought a whole 4 gauge kit a while back...thats what i am still using .....i will also clean the rca's tomarow...when you say to wrap the wire around the connected rca's do you mean both of them or just one????and then loosen up a screw on the actual hu and attach the cable to that?????......also the hu is alright but im willing to upgrade if this wont solve the problem...i will just put that deck into my 88 olds that i use for work....my p.o.s car...... what deck would you suggest....250 price range.......thanks for all the help so far swez on 02/9/2009 02:11:31 RF sells pretty good wire products and such. But I think your HU has an internal problem that is actually the root of this issue. Why? I cannot say for sure, but trust my gut this is where the main issue lies. Wrap both of them so they see a common ground, and then locate a chassis screw on the back panel and see it that help. (Pioneer has been having this issue for a while and this step seems to fix most of them) How old is this JVC Arcenal HU? I suspect it's been around for a while and your truck is asking for Alpine or another quality HU for the next 5 years or more. Chrysler electronics are not up to the same quality as other vehicles. I like the Durango too, but Chrysler has not updated their electronics packages nearly as much as other brands. Swez carlos_14_707 on 02/9/2009 02:30:05 your right it is ima say like 2 to 3 years old and it was only like 100 bucks..... but it is in brand new condition i try to take care of what i do have regardless of how expensive it was or wasn't.....but i also agree with you probably time for an upgarde ;)......im sure my gilfriend will be exstatic when i tell her i want something else for my car audio system.......she doesnt real like me to spend time on messin with it....says i should spend time with her instead...lol crazzy women huh???? sorry jumped off topic......back to the hu .... it has never seen anything thing like what i have hooked up to it now......(this stuff...amp/subs is the nicest i have ever owned)but none the less i will try to do that tommarow and let you kno how it went ....thanks swez on 02/9/2009 12:10:18 G/f's, wives and car stereos do not mix well. Women think when we have some free time, that's her time to get attention. (Know the drill well and that's why I am not dating) Like I said Carlos, my tool kit is losing steam on this situation. This is one of the most difficult problems to diagnose and correct for any tech and even harder to do over the Internet. After cleaning off your RCA connections and adding that additional jumper, if the problem does not go away, there's got to be something in this HU that is causing the noise. It would cost $50 labor + parts to repair it. That's almost 1/2 the cost of a new one. Besides, you'll not have a HU for weeks, depending on where it is repaired. JVC has a few major repair and service locations in the US, but if you could find an authorized repair facility locally, turn around time would be shorter if they can get parts. A thought, the HU works fine w/o the RCA's right? You can always sell/trade it for something worth while and get some cash back that way. If your g/f wanted a better stereo, give it to her and install it w/o subs. Happy Valentine's Day honey! Good luck and keep us posted, Dave Copyright ClubKnowledge 2009 * All Rights Reserved |