Firoz, welcome and great to hear about how you're enjoying the sounds with your Axioms. As to an amplifier "issue" if you order M80s, there's no good reason to assume at this point that there would be one. Your 1800 has substantial enough power capacity to meet the needs of M80 users in most home setups. Whether that includes your needs can only be determined by trying.

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Enjoy the music, not the equipment.