Forget the Yamy, Try a Krell, Mark Levinson, Classe, Bryson Etc 100watts or better, Look for doubling down to 2 ohms or even 1ohm. If on a budget a old KSA krell 100 will deliver 800 watts into 1 ohm. Classe DR 250 is another good amp. Also sunfire if you want new stuff at reasonable price,
