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Why do people say low power amps should be good for bookshelf speakers?

I was in a BB Magnolia recently and they had a McIntosh MHA150 integrated headphone amp that can also do 50 watts per channel to speakers. The sales rep said it "should be good for small bookshelves but its not enough power for towers". 
I've never understood this line of reasoning.  Towers are typically more sensitive than bookshelves. Is there an actual reason a small amp like this couldn't do just fine for towers that are equally or more sensitive than similar bookshelves?
roberthz
noromance's avatar
noromance
9,404 posts
 
The other reason could be that bookshelf speakers tend to be used in a lower volume type of setting.
tony1954's avatar
tony1954
888 posts
 
1. Some salespeople will say anything to make a sale.
2. Some salespeople are totally ignorant of the products they sell.
3. Some salespeople are alien agents looking to weaken our social network.
Take your pick.

earlflynn's avatar
earlflynn
461 posts
 
3. Some salespeople are alien agents looking to weaken our social network.
Take your pick.
Now thats funny.

aewarren
575 posts
 
+1 noromances.  I too think the salesman was making a generalized assumption that smaller bookshelf speakers would be listened to in close proximity and at lower volume levels and would thusly require less power. In some applications, but certainly not all, he would be right.
anotherbob's avatar
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anotherbob
331 posts
 
My Monitor Audio Gold 100’s are power hungry 4 ohm bookshelf speakers with 86 db sensitivity rating.
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