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Actually, the V6's have a 50mm driver I believe.
http://www.audioreview.com/Headphones/Sony...27_2750crx.aspx(just do a little google-ing)
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Anyway, comparing specs doesn't tell you a damn thing at all as far as relative sound quality of headphones. For example, If you were to compare the specs between the Sony V6, Sony V600, and Grado SR80, you'd find they all seem pretty good from the specs. In reality, they all sound completely different. V600 are an absolute waste of money (horribly recessed midrange, muddy and over-emphased bass), V6's are great but closed, and Grado SR80 are fantastic but open. The only way to compare headphones is to listen to them, and talk to other people who have listened to them.
I'll buy listening to them, but in my experience talking to others who have listened often engenders as much additional confusion as it does clarity -- sometimes more.
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But you do happen to be correct in that the Denon's do sound similar to the V6s. Many people actually prefer Denon 950's over V6s; they are suppose to sound more open. They do cost about $40 more though.
Not surprising, as the 950's are open-air type phones, and the V6's are closed phones.
There's too much similar between the V6 and the Denon 550's to infer much difference in sound -- prices are similar, they're both a closed-type design, neodymium driver magnets, similar impedances, similar design/construction, driver sizes are similar, frequency range is similar, sensitivity is *identical*, they're both 'mid-fi' (sorry for the term) Japanese brands. Yes, they could sound somewhat different but there's enough there to make an educated inference, in my opinion.