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That beautiful s ignal that gets to your earbone has to pass through a lot of electronic bits. it has to go t hrough integrated circuit chips, and a lot of resistors and capacitors. You may not know this (because you may never have heard super high-fidel ity audio systems) but your hearing system has an exquisite ability to l et you experience sound. So much so, that on very high end systems you c an almost feel the gravelly moisture at the back of a singers throat. Ma ny of these super-stereos are simple in design but use parts that cost h undreds, even thousands, of times more that the parts you find in a typi cal stereo. and it's thos e resistors and caps we put in the Total BitHead. Quite a bit more natural, is really the way you hear it. Listen ing fatigue vanishes and you are able to listen effortlessly for hours. Cheaper parts sound grainy and slightly confusing in comparison; Yes, we use the best cheap parts we can fi nd in the standard BitHead, but in the Total version no expense is spare d Don't bother to spend the money on this parts upgrade if you haven't spent money on good headphones first. But if you have, the Total BitHead will provide you years of easy and natural listening pleasure from your computer as well as from analog sources. If you are a normal person, don't bother to read the rest of the text (it just technical parts information), but if you are a total audio freak, read on.
It's the same chip in both amps, but this wa s a good place to say it. It's a "rail-to-rail" op-amp meaning it can dr ive its output almost to its rails regardless of supply voltage. So, it will keep working well as long as the supply voltage is more than the pe ak audio voltage needed to drive the headphones.
Here's an exerpt from the article: PPS film chip capacitors have been the most successful to date, even tho ugh they are extremely expensive. There are six known suppliers of PPS film chip capacitors. PPS film is ideal for higher operating temperatur e environments, where it can work from -55 degrees Celsius to 125 degre es Celsius; it also exhibits extremely tight tolerances in either +/- 2 % or +/-5% configurations (better than an X7R ceramic, but not as good as an NPO ceramic capacitor). The capacitance range and the voltage ran ge of PPS film capacitors are limited to 00001 to 01 F in 16 Vdc and 50 Vdc configurations, respectively. However, PPS film's claim to film chip capacitor fame is its ability to withstand soldering temperatures up to 260 degrees Celsius, which is much better than both PET and PEN film chip capacitors. Still, the PPS film chip capacitor is extremely e xpensive. What they don't really talk about too much is how good they sound, which is great. They are significantly less grainy sounding than the ceramic c aps.
PHR series resistors we use are the military grade mother of all surface mount resistors. I could tell you that they were: 015% l oad life stable; The immediate reaction around here was, "Well, I don't kn ow about what we sell our customers, but I want mine loaded up with thes e" Our next, more responsible and business-like reaction was, "If we li ke it, someone else will too.
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