My roommate also just bought a dv7 with Beats. Naturally I was curious, so I gave it a listen. Though not Beats (Altec Lansing, I think) the speakers are the best I have ever heard on a notebook. Obviously I would never want to listen to music from notebook speakers, but I cant count how many times I've wanted to show someone a Youtube vid or whatever and wished the speakers were louder. Also in that vein, there are two 1/8in jacks. This will be useless for some but I would love this feature.
Regarding the SQ, I gave it a casual listen with some sr60s, since they are the only cans I have that don't require amping, and I was actually impressed. No headphone out on a notebook is ever going to be great, but I thought it sounded even better than my mac and definitely better than either of my asus comps. There is obviously some EQing going on which can easily be turned "off." But it's hard to tell what exactly that means. It predictably affects the bass primarily.
I thought the performance seemed better than could be achieved through EQ voodoo, so I hunted down some description of whats going on hardware wise, but couldn't find anything beyond repetitions of the marketing blurb on HP's website: Redesigned headphone jack to reduce ground noise, Discrete amplifier for more power, Dedicated audio island to minimize fan noise interference. That all sounds good, I guess. But it doesn't mean much to me without specifics about the design and hardware.
If I had to live in a world without external DACs and amps, then I might want one. Thankfully I don't
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