My questions regarding upgrading your Mc-462 to Mc-611’s are this,if your not powering the amp from a dedicated 20 amp line for the amplifier alone then you will not get the amps best performance,nor will your Mc-462 be able to reproduce peak swings over roughly 875 watts ,a 15 amp line will not allow your amp to deliver its 1,800 watt peaks , the specs between your Mc-462 and the Mc-611’s are the same so no advantage to the Mc-611’s except a 150 watt bump in wattage will not even give you the extra +3db increase in volume to hear a slight raise in volume ,there is litterally no audible difference between 450 watts and 600 watts ,and if you plan on running the Mc-611’s on a 15 amp line the 611’s will be held back even more due to lack of incoming power .
How many dedicated lines do you have & are they 15 or 20 amp ? A much better upgrade where your assured to hear a difference would be upgrading to a C-2200 up to the C-2600 tube preamp if your not running one of those models already ,if you are then upgrading your speakers to one of the Mcintosh line array systems would be a massive upgrade that could be heard at all volume levels,used XRT-28s up to the XRT-1k would both be a much better and more audible upgrade path than boosting amplifier wattage for a 1db increase in SPL by jumping up to the Mc-611’s .
How many dedicated lines do you have & are they 15 or 20 amp ? A much better upgrade where your assured to hear a difference would be upgrading to a C-2200 up to the C-2600 tube preamp if your not running one of those models already ,if you are then upgrading your speakers to one of the Mcintosh line array systems would be a massive upgrade that could be heard at all volume levels,used XRT-28s up to the XRT-1k would both be a much better and more audible upgrade path than boosting amplifier wattage for a 1db increase in SPL by jumping up to the Mc-611’s .