I can also highly recommend Diamond drivers.

What I don't like is this popup at their web site:

WARNING: Diamond Audio does NOT authorize ANY internet sales of car audio products.
Diamond car audio products are designed to be sold and installed by experts at authorized locations.
Products purchased from anyone other than an authorized Diamond retailer may not be new or even genuine Diamond Audio Technology products, and do not qualify for Diamond Audio's limited warranty or technical support.

Is that even legal?

Rob