khaos974
Headphoneus Supremus
- Joined
- Mar 19, 2008
- Posts
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- 122
Apparently http://www.head-fi.org/t/584202/epiphany-acoustics-join-head-fi-with-the-ehp-o2-portable-headphone-amp
Looks like I spoke too soon. While the RC filter definitely reduces the temps the v-regs reach, after leaving the amp plugged in for a full 24 hours the sound regressed towards the oomphless smeary sound I've become so familiar with.. The v-regs are still reaching close to 50C, and at those temps I do hear a difference in the sound quality.
Heat is a nasty thing and this amp encourages it blatantly.
Alright, when mine comes in I'm going to post shots w/ my IR thermometer.
I guess I shouldnt have been surprised, but all the plugpacks in my little town in northern NSW use some form of DC switching - the exact type of wallwart that Voldemort loathes in cheap amps. Fortunately, we have a new-fangled contraption called the internet, and all is not lost.
I've left my amp on for a week straight and don't get nasty temp issues. Sounds like you pooched your amp, you're really going to need to fix it before any of us will take you seriously.
I am pondering doing a giant, multi-page O2 review, but I can't think of much use for it - I don't believe in subjective amplifier description silliness and am incredibly biased (I like NwAvGuy, I like the amplifier design, I like the reasons behind it, I like what it is doing) so it would just be a load of rambling about the history of the amp until you finally got to the "Listening Impressions" section, which would read "See Measurements."
Has anyone else had problems with the O2 not shutting down on low battery like Voldemort said it would?
I just did a test run while studying for finals here, I had the amp running on battery power for roughly 8 hours. Right around that mark the music was distorting, first very slightly and about 15-20 seconds later it was distorting a lot. I knew instantly that this was batteries low time, so I plugged it in, and the great sound returned.
But, it never shut off? What gives!?
EDIT: Yes my amp is built with all standard parts, I didn't go experimental on it, its built correctly, blah blah blah, I know what I'm doing![]()
There have been a few folks who have had this issue in one way or another. Most have had a power on/off cycling as the load on the batteries is removed/re-applied. There was an update to the values of a pair of resistors. R25 1.5M ohms R9 33K ohms. From what I understand it's a battery induced change to account for different batteries.