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Help: Right tweeter alternator whine after upgrade
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07-14-2014, 06:18 PM | #1 |
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Help: Right tweeter alternator whine after upgrade
I've upgraded my entire base audio system. I'm essentially done and the system sounds great, although the bridged Solid 4 cuts out when I play too much bass/volume, so I turned down the subwoofer setting on the MS8 which seems to have helped. I'm supplying 200W to the 150W subs so I'm guessing that's the issue there. I've used just about every tip on this forum for the install and one day, when I have enough time, I may post my own DIY. Thanks to everyone who already have done this, couldn't have completed this project without you!
The biggest complaint I have is that alternator whine exists in only the right tweeter. It also gets fuzzy on certain frequencies. I've checked and rechecked all my connections, can't find anything wrong, I've also searched forums and it doesn't seem this is common. I did find I had the +/- wire switched in the crossover but I fixed that and the problem still exists. What ideas do you have to troubleshoot? Possibility: Only on the right door where the tweeter is, I had to add another foot or two of speaker cable so the stock wire could reach the crossover. Is it possible a poor solder job can cause the noise? I've pulled on the connection and it seems pretty solid. Synopsis of install: BMW professional HU, technic harness, focal k2 power 100KRS in front doors, added center speaker, ms8, earthquakes under seats, focal solid 4 bridged for subs, focal solid 2 for doors, ms8 powers center and rears, all amps use ground pt above left-rear wheel well. |
07-14-2014, 06:58 PM | #2 |
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I used a ground point near the battery (right rear) and I don't have alternator whine. Make sure everything's tightened up correctly. Also try to lower your input gain to your amp.
My system is Helix DSP -> Arc XDI 600.4 > Jenhert XE200 (underseats) > Morel Virtus (front) and stock rears. |
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07-14-2014, 07:27 PM | #3 | |
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I have considered grounding directly to the battery; however, that seems troublesome as it will add much more wire to the trunk (my amps are on the left) and it would be over 3' which I read is not good. The ground I've used is apparently the best ground location to use. I don't think it's a grounding issue--but I do appreciate your response. |
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07-14-2014, 08:23 PM | #4 |
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Try unplugging the rca's from the amp. Make sure you do it while the car is asleep. May take a few minutes. Wrap the bare ends of the rca's in electrical tape to protect them. Turn on the car and rev up the engine. Still getting alternator whine?
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07-14-2014, 10:41 PM | #5 |
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The MS-8 can pick up noise from the speaker wires being to close to the power wires. Doesn't have to be the speaker wire for the side that whines either. It can be any speaker wire. Then it will send the noise through the RCA on only on channel. It doesn't make sense and it took me forever to trouble shoot. Also, as suggested, turn the gains down. Only turn them high enough such that at -6db ms8 volume it gets as loud as you'd ever want it.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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07-14-2014, 11:24 PM | #6 |
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You could try reversing the left and right channels
You could try reversing the left and right channels
starting at the amp and working your way back to see which module it tracks with, if it does. |
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07-20-2014, 02:01 PM | #7 |
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Thanks for the responses, Fellas!
@tdgesq: I will try this, I tried something similar with no success, but the car wasn't "asleep" @kaigoss69: when you say don't let speaker wire get to close to the power, does that mean they can't cross at all? They do cross right at the amp but they don't run any length together. I believe last year when I was troubleshooting, I tried avoiding the crossing altogether but it didn't help. @ctuna: I've tried reversing the RCAs, the whine stays on the right side--leading me to believe it's something in the door that's causing it. Could it be a poor solder job? How do you know if it's bad or not? I also don't understand this, "starting at the amp and working your way back to see which module it tracks with" Last edited by SpdRcer43; 07-24-2014 at 04:03 PM.. |
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07-20-2014, 02:17 PM | #8 |
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No RCAs, no speaker wires crossing the power wires! Run them in opposite directions if at all possible.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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07-25-2014, 02:46 PM | #10 |
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If you unplugged the rca's from the amplifier running to the tweeters, and you still get alternator whine from the tweeter, then you've eliminated as a cause everything "upstream" from the amplifier. This would mean that it isn't the headunit, the processor, or any of the wiring prior to the amplifier.
That's why I suggested unplugging the rcas from the amp, turning on the car and revving up the engine. Assuming after you do this you still get whine from the tweeter, then we need to do more isolation and testing. The next step will be to switch the tweeter speaker wires at the amp. Switch left channel to right channel and vice versa. If it switches the whine to the left tweeter, you know it's the amplifier itself or the ground to the amplifier (most likely the ground). If the whine stays on the right channel, then it's most likely a speaker wire issue to the right tweeter. |
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07-29-2014, 01:13 PM | #11 | |
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08-01-2014, 02:33 PM | #13 |
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@tdgesq Okay, so I switched the actual speaker wires on the focal 2, and the whine went from the right, to the left speaker.
So is it worth trying to get the amp looked at? Or just move the ground for the amp? I used the same grounding point for both amps and the processor, which was recommended on this site to use the location right above the left wheel well. |
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08-01-2014, 02:35 PM | #14 |
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08-01-2014, 07:48 PM | #15 | |
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If you still have noise, time to get the amp checked. |
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08-25-2014, 11:19 AM | #18 |
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08-25-2014, 11:39 AM | #19 | |||
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Quote:
You can always disconnect the MS8 to test for yourself, but my money is on the amp. edit: This is a review I saw about Focal amps as of last year... Quote:
Last edited by Wongway; 08-25-2014 at 11:45 AM.. |
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08-25-2014, 03:53 PM | #20 |
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I agree with Wongway. If the MS-8 isn't connected to the amp, and it still causes the tweeter to whine, then I can't see how it could be the MS-8.
Switching out the amp is a real pain, I know; yet that seems the most likely candidate. The only other possibility I see is that your power wire to the amp is the incorrect gauge (too small), but I'm assuming you did all that correctly. Time to test a different amp. |
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08-25-2014, 04:27 PM | #21 |
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The more I look at the original post, the more I'm thinking it's either
a) Your focal amps are overrated. Because you're saying the subs were cutting out when bridged? It gets fuzzy on certain frequencies? or b) You've got some bad wiring in there. I might be off base, but the amps seem very suspect to me... Bad internals on the amp could be the source of all your problems. (Of which, I'm sorry to say) But I'd seriously consider trying two different amps. For both the subs and the doors. |
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08-25-2014, 06:09 PM | #22 |
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Thanks you two for the comments. I will see about getting the amp checked out...not exactly sure how to do that and it's out of warranty technically but I will send some emails and maybe take it to the local audio shop.
Notes/Questions: -8-guage wire was used for all power and grounds (Solid 2, Solid 4, MS8) -I will restate that I'm supplying 200W RMS to the 150W RMS subs. Could this extra 50W be doing that much harm? -I am not using the infamous JT Sherri spacers. But this wouldn't cause the speaker to stop working if it happened to hit the grill from time to time. Right? EXTRA NOTE: I just read on this link that 4-gauge wire is recommended for my Solid 4. I'm using 8 because that's what my calculations say to use...but my calculations were also based on RMS. Could this be causing the whine in the tweeter in just one speaker?! I don't see how but surely it's a possibility. http://www.crutchfield.com/S-SreiwYc...lid-4-Red.html Last edited by SpdRcer43; 08-26-2014 at 09:28 AM.. |
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