OK... ecost is definitely an authorized reseller according to www.denon.com, so whatever the factory warranty is you have it.

Having said that, I'm having a heck of a time finding the warranty details on the Denon site. Geez, no wonder you posted, this is worse than the manuals ;(

Anyone else ? I'm no help...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8