till
Head-Fier
- Joined
- Feb 17, 2004
- Posts
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Whoops! No, the jacks are not isolated. I have to admit that I totally forgot about the ground channel. OK, I guess I'll look for new jacks... thank you for the hint, MisterX!
The sound of the woodied HF-1's is definitely different than the stock ones. I had a chance to sit down with Nate's stock HF-1's and my modded ones. There's definitely more bass extension and seems to be more bass detail as well. The treble has smoothed out considerably, and while they definitely don't have any less detail, there seems to be a little less treble "sparkle." They are definitely a little easier to listen to. And the mid-range is fuller with more body. I find the biggest difference in male and female vocals, and thick walls of heavy, distorted guitar. So I would have to say I'm very pleased with the changes made. |
Originally Posted by Banfi T. (Those BJTs wouldn't survive the current demand (and the resulting heat dissipation) of a speaker, so do not try that configuration...) |
Originally Posted by boodi nice faceplate design .. congrats on the choice does it make justice to the hungry k501 ? |
Originally Posted by amb ryanjun, congratulations on a nice and professional looking amp. While you may have gotten your inspiration from a PPA, your amp is not built on a PPA pcb, nor does it have 3 channels which is an important defining characteristic for the PPA. You had not published a schematic so I don't know how else your amp deviates from that of a PPA, but from just those things alone I'd call it something else rather than a PPA. |
Originally Posted by ryanjun ... with a dual DC supply unit which has a FIRM ground, u don't need to add a gnd channel to stablize the gnd circuitry. |
Originally Posted by amb This is not the right place to discuss the technical merits, but suffice to say that I have done much exploration and testing in this area, and that "firm" ground you speak of in a dual supply is not as firm as you might think, when the headphone load return current is dumped into it. |
Originally Posted by amb This is not the right place to discuss the technical merits, but suffice to say that I have done much exploration and testing in this area, and that "firm" ground you speak of in a dual supply is not as firm as you might think, when the headphone load return current is dumped into it. |