The wattage figures mean nothing without comparable 'thd'
Measurements.
Go and find out what thd the figures were taken at...
(How much distortion was present when fig's were taken)
Regardless ,the 667 will easily deal with whatever you throw at it......especially if your previous yam can do it .
I'm quite impressed with mine.....all the reviews were extremely positive...big chunky power supply ,by all account's
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