Alright, I'm running a new HP DV6-6135dx here (with HP Beats-branded audio) and I can safely say that if I were you I'd put that money toward a decent set of headphones. Before you do that, do yourself a favor. Disable Beats Audio (Fn + B, but I'm sure you already know this). Then go into sound preferences in control panel, double click on your audio device, hit the tone controls tab, and adjust both bass and treble to ZERO. I've found that the HP Beats Audio panel (really just a standard IDT codec panel with a different skin and the cheesy Beats effects) likes to screw with those tone controls in Windows. When you enable Beats Audio, it jacks bass and treble up to +4 each, but get this- when you DISABLE Beats, it turns bass down to -14, effectively making your original signal sound remarkably weak in comparison. Anyways, to get back to your original question, my DV6's internal codec powers my Audio-Technica ATH-M50's quite well, and I'd have to say it sounds about on par with, possibly better than, my ASUS Xonar DG desktop sound card with discrete headphone amp. It's definitely cleaner than straight from my Creative Zen, too. This is just my impression, but I'd have to say with Beats disabled and the settings returned to normal, this is one nice sounding mobile machine. There is, however, a tiny amount of background hiss, but you'll probably only notice it with some highly sensitive 'phones. Just my two cents. Oh, and on a different note, if yours is an AMD A-series equipped model, look into undervolting that CPU too. By undervolting my A8-3500m, I gained right around an hour of battery life with the same clock rate.
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