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Thanks James, very helpful. Will give it a go.

Thanks Hugh - is there a way to confirm that? i.e. would a multimeter on the + and - in the loom pick it up?

Thanks, I fitted a new earth a couple of weeks ago from loom to an existing earth point in the passenger footwell, but it hasn't affected the noise. Today I tried again running an RCA from the HU over the headrests to the amp in the boot, which also made no difference, so I can rule out the...

Wired the speakers directly into the HU and still get the "pop" when turning on or adjusting volume.

I'm fairly confident my amp is buggered, and that's what's causing my issues :/ Might try and convince Halfords to let me plug in an unboxed one to confirm... :S

I've added a ground to the HU metal casing by a screw at the back and a bolt on the chassis, but it's made no difference to the whine. The speakers have also started to "pop" recently when powered on or off, or when adjusting volume. The HU went into "protect" too a couple of days ago but...

Thanks, I have re-done the amp earths, and am now about to re-earth the HU itself. Is there a specific point to use on the HU, or can I take it from anywhere on the metal casing? Or should I use the original earth on the loom but re-locate it? Does the size of the cable used matter? I've got a...

Grounds on both amps re-located and screwed to bare metal. Could it be the HU ground?

I have relayed all cables in the rear half of the car and made sure not to coil anything, but there's no change to the noise.

The Borbets will look incredible!

I have cable tied the excess wires behind the amplifier. I'll try laying them under the back seat to reduce that, and see if it helps the problem. It's a Fli 900 amp :/ I know, I know! :P Rainbow Componants in front and Vibe Blackair ltd. ed. 1600w 12".

Just tried a more substantial one and have exactly the same problem. It takes out the midbass and lower end sound. Will be taking it back in the morning. Are there any other ways to remove the whine without stripping the cables and relaying?

I'm afraid I've bought a bad one ;) Was £6 from eBay, and don't get me wrong it works - the sound quality however is just awful! Sounds like a cheap ipod dock. On removing it I get the buzzing and whining again, but the quality of sound is incomparable. I'm looking for ones from reputable...

I got the normal Micra Bubble sticker from this site recently :)

How hot do the headlight reflectors get? I'm looking to paint the edges black like on my old Micra. Then, I used a high heat spray. This time I want to brush it on though, as the masking tape pulled the silver off when I removed it. Can I just use, say, Hammerite or does it have to be high...

Thanks for your replies. As for ground loop isolators, are they much the same or do you get what you pay for? Is there any reason why it might come and go like it does? When I've had it before it's been constant. Cheers, Tom

Hi, where in Suffolk are you?

If so, what would you use? Is there a specific place to run the cables from the HU to the boot? Mine just go down the drivers side, just under the carpet. The speaker cables go along side, and power cables go down the other side. I have alternator whine that comes and goes every so often...

I didn't this time round, they just screw onto the existing ones for the back. Then a metal spacer fits over them. For the fronts, I only used a 5mm spacer so I didn't need the extended studs. On my last one I used 20mm at the back and fitted longer studs. Was easy to do.

Fronts are 5mm each side and the rear is 32mm each side :) I'd like to go more on the front (probable to 10 or 15) but apparently it affects the steering.