I have a pair of sansui sp2500 and one of the woofers blew. I replaced with a Dayton Audio DC300-8 12inch woofer. I personally like how they sound now, low end is more apparent now. I had to shave/sand down the cutout diameter a slight bit but the bolt pattern lined right up and went in with ease. Just wanted to share incase someone wanted to try the same. Below is also a picture on how it came out lookin.