If you are familiar with Cadence, then you will know they have/had one of the best 8" subs for the money, on the current market.
I have been using these 8's (model # cvl8-500-4) for quite some time and have had excellent results with them. They have been klippel tested and modeled very well according to Audio_Phill. Recently Amazon has been having a good sale on them at $66 per sub
Amazon.com: Cadence Acoustics CVL8-500-4 8-Inch 4 Ohm 1000 Watt Subwoofer: Electronics
Knowing these subs were great drivers I purchased 10 more. Well about a week ago the first set arrived and low and behold they looked the exact same... BUT, I get to inspecting them more over and find that the motors on these sale subs are not even close in size. The bottom and top plate are within a 1/4" smaller than the older ones i have. The pole piece looks to be sleeved and the back plate is even milled for less steel. I will post pics.
Today I call Cadence Sound in Howell, NJ and speak to a technician who didnt really know what to say nor have the right answers. He puts me on hold, comes back to say they went through a different buildhouse and he "doesn't know what to tell me". I begin to tell him that since these motors are not the original CVL8-500-4 I had bought that it was fraudulent and wrong to try and pass them off as the same ones. The differences in motors would actually make these new ones weaker for what I am using them in. If it is sleeved pole saturation would be higher lowering QTS by dropping QES.
Regardless, with these new run of 8's from a different buildhouse the listed specs would not even be close to what is in these new ones compared to the Gen 1 8's.
I called back asked to speak to a supervisor, the tech had put me on hold again, then tells me they are looking into it and would have to get back to me. Then makes it a point to tell me on their website it says they reserve the right to not publish everything. I told him that is fraud and just wrong. They are not the model # cvl8-500-4 then and they are in fact a different model. I had bought 10 of these and they are bogus motors not what is being advertised. I was told I would be getting a phone call back and still nothing.
I figured this would be a good thing to make note since there are some 8" fanatics on here as well as Cadence fans. I think its absurd they would be ok with doing business this way as its false advertising.
I will be posting pics of the differences in motors once my camera is charged.