A friend moved a few years ago and gifted me his old Allison's. I brought them home and they've been in a spare bedroom ever since. I finally got them downstairs and set them up next to my Boston Acoustic A100's, which I got new about 35 years ago or so. I quickly found out both woofers needed new foams, as usual. No problem, I've done them before, so eBay sent me a new pair, and I got them up and running, but one of mid-ranges had broken wiring to the coil. Played around with it, but they weren't repairable. Took a while, but eBay also came thru on a new mid-range. Started hooking everything up, and discovered I have one CD-9 and one Nine. I asked the guy I got them from and he says he got them new and never had them in the shop. He never knew he had 2 different speakers! I can only imagine he bought them, and the guy at the store said "Hey Jimmy - go in the back and get me 2 Allison Nines". So Jimmy grabs the first 2 boxes he sees and my buddy goes home none-the-wiser. After a while it dawned on me.... this means there has to be another dude out there with the other mis-matched pair! In case you are wondering, they sound identical to me since I didn't bi-amp the one. The only difference I can hear is that the Nines sound a few DB's louder than the CD9, so I have to set the balance knob a little to one side.