I am wondering if anyone has had problems with Class D amps introducing noise into other components in the system like front stage amps or processors?

I have an earthquake amp (200DHC)and it introduced a whistling noise if i have it within about 1 foot of the DSP processor & other amps.

Now i have upgraded to a newer earthquake amp (D5 i think), and newer processor (Alpine PXAH700 optical fibre in) and am wondering if i am likely to get the same intorduced noises when i connect it because io would really like to mount the amp right next to the processor to make the best use of the boot.

you might, it depends on the shielding of the various parts.
although, to get any noise from the class D, it must have been VERY ordinary in the shielding department, and probably didn't conform the the CE rating (which is possible, since it is a very old model)

isnt class D meant for subs? they arent that good for full range from memory...

I think he meant the switching noise from the amp was leaking out of the amp into the other gear close by.

uggh!

best bet is to keep anything like that away from your analog gear. I have about 24 inches between the inverter and any other equipment, although the RCA's go close, there is no pickup (the inverter is not earthed either, which is important)

Class D runs the subs, i mean switching noise being radiated through the front stage amps (phoenix gold)

New sub amp will be Earthquake PHD5000 so new model and should be better insulated, processor is also a newer Alpine one with Optical fibre in, where as old one was an old pioneer unit.

Why dont you just make a farady cage, and that will stop all electrical noise.
All you have to do is wrap what you want to protect from the nose in tin foil, or better yet wrap the thing making the noise to stop the noise frmo being emitted.

If you dont like the tin foil look, then see if you can open up the amp or processor and cover the inside of the casing with tin foil to stop the nose. but be careful not to shortcircuit something with the foil.
Maybe put the tin foil between two sheets of paper.

it may be a faulty de-coupling capacitor causing the case of the amp to become an antenna, and sending out all the switching noise.... wouldn't be the first I heard of this problem, as it's common on radio transmitters.
not really any point opening it up unless you have the tools to find the fault, such as CRO and FS meter / RF probe.