Originally Posted by 02Zetechse
IMO you got screwed on the kit , but yeah stick with same size subs, it will be the least headache, the only issue will be trunk space
There is nothing wrong with using different size speakers for different frequency ranges. There is a reason tweeters are small and woofers are large.
The potential for sound quality is improved by seperation. With good equipment, done correctly, it should sound quite good.