B&W 803D - Best amplifiers to drive them


Hi!

I actually have a few questions and I would really appreciate your wisdom on them:
1) 803D versus 802D - other than prize and size, is there is significant SQ difference, or if under budget constraints one settle for the 803D as they are 'almost' there?
2) Used 803D, how does one test a 2nd hand used speaker? Is there any way one can tell other than listening (auditioning) and visual inspection? Are there any key look outs?
3) The main question - which amplifiers drive the 803D the best? the rating says 50-500 watts, but that is a huge range at 8 ohms!!!!

Please do let me know
Thank you.
K
kelpie

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