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Posts by thomas

Quote: When folks do stuff like copy and post the circuit for the RA-1 that does nothing top help our end of the hobby one bit. Actually, the RA-1 design was practically common knowledge to DIY ever since the DIY boards at headwize were started about 5 years ago. Since there are few if any members from back then who are still here, i'd like to point out that at headwize was largely a gathering of DIY hobbyists interested in headphones- by hobbyists,...
"Detail" is a subjective term that's hard to relate directly to the performance of a specific component- a lack of detail could be caused by distortion, poor high frequency response, or compressed dynamics, which could be solved by improving the amplifier. Anything that makes the output signal closer to the recorded signal will increase the apperent "detail" in the music. The reason i recommend upgrading the amp is because it is usually much worse than the DAC in a...
Quote: Is there something about the setup you’re suggesting that would keep it from being portable to this degree? Nope, not at all- But when i mean portable, i'm speaking from my own experience, usually using it on the bus or jogging- in that case, i want the whole system to be small enough to fit in a pocket- which rules out both classic CDP's and external components. But you can easilly fit a DAC or amp into a small discman/camera bag, and have...
Quote: This alone proves that it’s not an either/or choice. It IS NOT just a choice between convenience and sound quality, or it didn’t used to be. There used to be a spectrum of choices. There is choice- get a good modern player like D-ej2000 or an iriver IHP, and add a headphone amp. Still not happy, then add a battery powered DAC as well. The whole combination will still be about the size of a classic CDP, and sound way better than any of...
The D-ej01 does have a terrible headphone out, but it also has a very warm, smooth line-out- one of the best of any player i've used (not very many)... Even Keven Gilmore used a D-ej01 with his portable STAX setup.... So if you're using an amp, its one of the best players- not very many players have linear antishock, and most that do don't offer the same level of skip protection. And if you're using it with an external DAC, you still get full skip protection, something...
Disclaimer- I've never actually seen a set of electrostatic headphones in my life, so my description might not be completely accurate... I don't think your descriptions of the cables is correct, AFAIK there's no way to send power on one set of wires and a signal on the other, and combine them together in a passive componenet like a headphone- only an active device like an amplifier can perform that function. I believe the extra set of wires in electrostatic...
First off, G-protection does not use compression, though many of the older "classics" with 40 second buffers did use compresion I have a 5 year old Sony D-ej01, the first with G-protection. It uses a 16 mbit DRAM chip for the antiskip buffer, and gives about 11 seconds between physically stopping the disc from spinning and the music to stop playing. This matches perfectly with the 11.3 seconds of cd audio that could theoretically fit in a 16 mbit chip without...
http://www.nytimes.com/2004/01/17/sc...partner=GOOGLE
I just found out that the professor for my analog electronics course (just started this week), Dr. Lloyd Pepperd, is the owner/designer of the Mapletree line of amplifiers... As a professior of solid state electronics at one of canada's major research universities (Queen's), he is an expert on solid state amplifier design, yet in his spare time, he develops tube amps.... So i guess vaccum tubes do have merit for not just "snake oil" audiophiles, but even expert...
Quote: Thomas, That is a part of doppler effect. This moving boundary changes the effective path of sound in the frame of reference of the audience. However, what you suggest is very difficult to do. And you can achieve the same effect by moving transducer in the air. (no need for other gases.) You can change the path of sound much easier. You are complicating the problem by adding more variables. I know, I never expected it to be built, just...
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