Speakers are 6 1/2 front, and 6 1/2 for the rear seat side panels. Audiobahn isn't bad, but I've had too many problems with them as well as others. Diamond Audio, Memphis, Pioneer, Alpine...they're all great brands to buy. Personally, from experience, Memphis makes some high quality stereo equipment. Their highs are crystal clear and very loud. Check out
www.memphiscaraudio.com to locate a dealer and get some prices. Other than that, you can check out
www.sounddomain.com, www.audionmore.com, to read some reviews from people that use other brands also.