Many, many years later... I guess during the time that Head-Fi went through some major revisions and all the links and addresses internally changed the photos were lost. I wasn't using Head-Fi at the time, and didn't see it happen. I still have all of those pictures, and will gradually put them...

From a technical point of view, there is no reason for this to be true - the impedance is very high which makes them easy to drive, not difficult. The fact that you have to turn up the volume dial further than with other headphones does not mean they are hard to drive, it means they require more...

Quote: Originally Posted by MoData Not questioning your statement, just curious as to why you think high-gain is a bad idea. Does it really matter? For exactly the reason I stated... Volume potentiometers have optimal areas in their range where the balance between the...

I don't get the obsession with using higher gain than necessary. The volume pot is at its best either in the 12 o'clock region, or at completely open (100%). You should use the gain switch accordingly. With a powerful source like the Micro DAC, there is absolutely no reason to use high...

Quote: Originally Posted by blaked Hope no one minds me jumping in on an old thread, but I was just about to start a new one about my "Little More Power" circa 1999 when I found this one. It has been a terrific amp and it's still performing admirably. Maybe ignorance is bliss, though...

Quote: Originally Posted by Exact Sound I also have a current production Total BitHead amp that doesn't do this? Are the specs for this potentiometer different on the BitHead vs. AirHead? No, the current production version has DC blocking caps in the circuit to kill the...

Quote: Originally Posted by Exact Sound I bought it off eBay and the amp sounds fine but a fair amount of hash is audible when the volume wheel is turned. In fact...if turned quickly it will clip the amp? In the past I have had good results using WD-40 on the fuzzy potentiometers but...

Quote: Originally Posted by 3602 Still no E-Mail responce, still VERIFIED. That $300-something hard-earned bucks! Smells fishy. What if I'm being ripped-off here? Which authority should I contact? Are you kidding?

Quote: Originally Posted by 3602 And I am very sure that is not a mental effect. Uh, how exactly? Isn't the whole point that you have no way to check this... Measurably, the gain settings effect high frequency ringing to an order of magnitude so small I doubt a bat could hear it.

Quote: Originally Posted by Necrolic Yeah I'm looking for a HeadRoom response to this. I mean I just can't believe that for an extra $330 all you get is some added convenience... There must be something different in the electronics, right? There is a small difference in...

All active stages (gain and crossfeed) are handled by AD8397 opamps, which also serve as the power amp stage.

Quote: Originally Posted by Tyll Hertsens Sorry it took me so long, Daniel, I looked really close and they look like the same data to me. Well since I posted, the graph has changed... When I posted, the point about parity between output at 20hz and 1khz with the d7k was valid...

Quote: Originally Posted by Jamey Warren HeadRoom is open. Are you having troubles calling in or placing orders? Thanks, Jamey Me is confused. Are you back?!

Quote: Originally Posted by aimlink At the same time, they aren't above reproach and if there's a glaring issue, it needs to be tabled as such. Glaring issue? A few specification disclosures from other manufacturers in similar markets: "SPECIFICATIONS: AC Input Voltage...

Quote: Originally Posted by Tyll Hertsens Here, lemme dangle that carrot a bit closer to your mouth: Not getting these graphs Tyll - the D7000 for example on the original HR graph has about equal output at 20hz and 1khz, on this graph it's now over 10dB down relative to 1k...

People tend to forget that this hobby is about obsessing about the tiny little differences. Objectively, the differences you are observing are really, really small when it comes to electronics. We just have amazingly well refined ears to detect these things, but it might take a while to...

Quote: Originally Posted by Hatmann I am certainly not questioning the integrity of Headroom or these products. But this is damn strange. The lack of information makes me wonder how they sell this stuff. Yes you are!

Quote: Originally Posted by aimlink Do I detect the resurgence of some sonic restlessness? The thing I regret is giving back my 'convertible'. Why oh why did I do that? I miss that amp!

Quote: Originally Posted by aimlink I have no doubt that Sloth's advice is very good but it's easy for you to say Sloth.... you've been around the block and personally experienced it. Now that you've seen it all for yourself and experienced the very best for what it is to you, you can...

Quote: Originally Posted by plonter any more comments about this..? If i am gonna spend more than a 1000 grand on a dac I want to be sure that it is much better than the ultra micro I have. Detail is nice...but what about other espects of the sound? would you say the ultra dac sound...

Quote: Originally Posted by Tyll Hertsens There's no "connectors" but there is a connection between the dac board and the main board --- I think it's a header, but it might be wired, don't remember. Riser board with soldered pins, no cables...

Quote: Originally Posted by tnili Does anyone know or can hazard a guess if this amp can drive an HD-800 adequately? HD800's are very easy to drive. Decent sensitivity and very high impedance. For any amp with sufficient voltage swing, they are an easy load and should allow the...

I believe this configuration of amp originally sold for $599 (including an AC wall wart and the battery pack). The electronics are a bit out of date and obviously the current version has internal batteries. Sonically it's probably in a similar league to the current Portable Micro Amp...

Quote: Originally Posted by aimlink I got a hold of a USB cable and tried a digital over USB connection. It's without any issues so far. So it would seem that there's a problem with the Toslink cable. Some optical cables are woefully inadequate. The best way to test is to use...

Bad boy Tyll, where have you been? This is a 2005 model Desktop Portable, most likely with the original Desktop Module and a single HA5002 output buffer. The DAC is absent, but a desktop DAC can be added. There is an upgrade form somewhere on HeadRoom's site. Somewhere around $300. The...