clarion does i think....... it maybe a 6x8 though im not sure you can get those adapters that mount a 5 1/4 component in a 6x9 opening wich would be the samething actually....the infinity 6x9s have a removeable seperate tweeter (the tweeter is actually seperate from the woofer unlike most spkrs)and a low/high pass filters exactlly like a component set.......so you could use that if you wanted to mount a tweeterand it would fnction just like a component