If you own a '93 CE you would only want to put a speaker in a factory location. That said, I would not expect anything larger than a 5.25" coxial would fit. All aftermarket speakers are four ohms, designed to match an aftermarket head unit. They are all made "offshore" and are very similar in sound. They differ only in effficiency which is why some play louder than others. They are designed to look different. Infinity speakers tend to be brighter. Kenwood, Alpine, Sony, Pioneer, Clarion, Kicker, Fosgate, Cerwin Vega, Earthquake (all Asian) are all good. The best speakers

ynaudio, Focal, MB Quart, Morel, Vifa, Audax are more costly, but sound better. All are four ohms and to get the best sound, wire a four channel amplifier between the CD head unit and the speakers. Do not use the o.e. fader. The head unit has an electronic one. P.