McIntosh amps are voiced laid back and mild in the midrange and upper mids. I have heard them sound very good with good speakers, such as Sonus Fabre and the like. However, McIntosh amps paired with McIntosh speakers sound very dull, boring and lifeless. There is absolutely no excitement or anything on this pairing. I would not recommend it to anyone unless you really want that type of sound.
The Revel speakers are excellent and would pair much better with the McIntosh amp. However, like everyone has said, they are not efficient (somewhat low at 86 db).
Some people here are recommending JBL compression and PA type speakers. While these are good for live sound events, they are still really not an audiophile speaker. If you are going this way with looking for a very efficient speaker, the new Klipsch Cornwall IV appear to be excellent. With an efficiency of 102db/watt, you can drive them to maximum volume with 100 watts at 122db. They will do much better then the other two speakers you are looking at for loud rock/metal type of sound.
There are others, but with the high power of the MC452, you should probably look in the 90-94 db efficiency range.
The Revel speakers are excellent and would pair much better with the McIntosh amp. However, like everyone has said, they are not efficient (somewhat low at 86 db).
Some people here are recommending JBL compression and PA type speakers. While these are good for live sound events, they are still really not an audiophile speaker. If you are going this way with looking for a very efficient speaker, the new Klipsch Cornwall IV appear to be excellent. With an efficiency of 102db/watt, you can drive them to maximum volume with 100 watts at 122db. They will do much better then the other two speakers you are looking at for loud rock/metal type of sound.
There are others, but with the high power of the MC452, you should probably look in the 90-94 db efficiency range.