Unless you have a large room a speaker with at least 90db and 8 ohm should work fine.
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I have used the Aleph 3 with both Meadowlark Kestrels and Dunlavy SCIVs both work fine, you can't however play VERY LOUD with either, but the awesome sound of the Aleph 3 makes up for the low power. If you are on a budget I believe that the Kestrels mate especially well, you can get a set used for around 600.00
I'm using an Aleph 3 with Quad ESL 63's in a room 19 x 14 x 9, and getting plenty of volume, good dynamics, and so on. I don't listen at head-banging volume levels, but high enough for realism. I'm using it with a Cinepro 10 Line Balancer, which may help. I'm using a passive preamp too, which works surprisingly well with the Aleph 3. Nelson Pass said he wasn' surprised, but expectations were against it.
I agree with most of comments on the sound quality of the Aleph 3 and David99 is right! I have been using a pair of Kef 104.2 (92db,4 ohms) I don't know what's the defination of 'headbanging volume' but I do know that in my 13ftx20ft room the bass extends to a very respectable level! The latest recommendation from my local dealer is the Italian horn speakers, Zingali. For those who has tried this combination, care to feedback?