When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There really should be no reason why an aftermarket pair should sound WORSE than the stock pair. Do you still have your stock speakers? If so, what is the impedance (ohm) of the speakers? Also, do you have access to a multimeter?