I have been studying the various schematics of op-amp based audio amplifiers and I notice almost all of them include a buffer stage. Why is this so? Wikipedia states a buffer will provide a very high input impedance to the output of the op-amp and a low output impedance. How does this benefit...

I'm looking to build an amp for my HD650. I have built amps before and other forms of circuits, but this is the first headphone amp I will be building. I've looked at the PPA and M3 amps so far but I'm not sure if they're right for the HD650. Any suggestions? Would the PPA or the M3 work well...

Hey all, My setup (Darkvoice 336 + HD650) just went haywire and is producing just noise. The volume on the amplifier has no effect on the noise and if I am, somehow, able to make the noise go the sound is completely distorted. Its a lot like listening to a highly compressed MP3, everything is...

Quote: a multi-stage opamp system (such as a voltage gain stage followed by a current buffer - see the section on output stages for more information), if the input stage opamp has a bipolar input stage and narrow open-loop bandwidth, it may exhibit nonlinearities when fed high level, high...

Hey all, I recieved my DV 2 days ago and it ran great. And right, as I switched it on the blue LED turned on and then went off. Now it won't turn on at all. I have checked the fuses, and both of them seem fine. Please help me! I'm very worried

Hey everyone, I'm going to be buying the HD650 very soon, but ofcourse, I need a proper amp for it first! I've researched on these forums and it seems the Darkvoice sries is very popular with the HD650. This is my first foray into the tube world, so I'm pretty clueless. I'm confused...

Hey everyone, I've been looking at various headphones and amps to go along with them for a little over a week now. I listen to mainly classic and modern rock, but am not really looking into Grados. I don't like the upfront sound, for some odd reason. I currently own a HD595, which is...

Hey all, I've been thinking of buying one of the new IEMs from Shure ever since they came out. I already have the E3c, but I'm not very fond of its signature. I like the mid-range, but the bass just doesn't seem to be there. I've tried the different fittings, but they hardly ever improved the...

I was reading instructions for the Pro-ject MK II Headphone amp and I came across this: I'm confused here... why would I want to connect my "Head Box" to my amplifier? I mean, shouldn't I just connect my source's audio-ouput to the Head-box's input? Also, what is the use of the out-put on...

hey everyone, looks like the "upgrade" bug has finally bit me. I'm currently running my HD595 through my stereo Yamaha amp and I really like the sound. I've also heard them through the top of the line Denon amp. and they really opened up then. It was really amazing. The source was a Panasonic...

I got my HD595 a few weeks ago, I was satisfied with them but I always felt something was lacking (don't we all? ). I was running them off my Mac Mini, whose sound-card I thought would be better then a PC. Yesterday, I decided to plug them into my stereo's Yamaha amp. I inserted Deadwing by...

Any Porcupine Tree fans here? I find myself enjoying pre-2000 (especially The Sky Moves Sideways and On The Sunday Of Life) stuff a lot more then In Absentia. Though I do prefer Deadwing over In Absentia... Probably because the latter records are more metal influenced and I'm not really a fan of...

I recently bought the Creative X-Fi XtremeMusic soundcard, do I still need an amp to drive my Senn. HD595? Will an amp improve the sound significantly? Thanks in advance .

Does anyone here own the Logitech Z-5500? If so, how is the sound quality? I already own decent computer speakers but wanted to upgrade to these or the Klipsch iFi. But the Logitech really does seem to be a better product, but i'm not sure because Logitech isn't a loudspeaker manufacturer like...

My E3c's right earpiece's cap broke a bit today, so now its very lose. The tip gets stuck in my ear when I try to pull the earpiece. I was just carrying it in my pocket with my iPod. I am honestly feeling like **** because of this, I just bought them 2/3 months ago and now they broke already! I...

A week ago I was on a flight on a bloody noisy plane and the Shure E3c worked great for isolation. I upgraded from the Koss Portapro I was using the small grey tips for a good seal. I was using them with my iPod Nano and I couldn't help but notice that they sounded quite bright. I could hear...

A week ago I was on a flight on a bloody noisy plane and the Shure E3c worked great for isolation. I upgraded from the Koss Portapro I was using the small grey tips for a good seal. I was using them with my iPod Nano and I couldn't help but notice that they sounded quite bright. I could hear...

I have a 4G iPod and a Apple Powerbook and I decided to test if the iPod really has bad sound quality as people on this board say. I used both lossy and lossless files. However I couldn't find significant different between my Powerbook and my iPod in sound-quality, and the difference that I...

How can I record the stereo layer of an SACD? Specifically Pink Floyd's Dark Side Of The Moon. I know this can't be done digitally (or can it? through the firewire port that a SACD player has?) so I'm going to settle for an analog recording. I think if I record from the line-in I will lose much...

Well I'm getting the Shure E3c (couldn't find the Etys or UM1's ), this will be my first high-end (well, for me) earphone since I'm upgrading from the Koss Portapro. I'm so excited, they should be here by the 26th, I can't wait!!!

Well my Koss Portapro finally crapped out, the left channel is producing too much distortion. Now, I've had my eyes on Shures E3c for a while now. I don't have much access to hi-end headphones cos of where i live, so all i can do is research instead of listening them myself. So what I wanted to...

I currently use the Koss PortaPro, they sound pretty good however I really want better sound quality. I was interested in Shure E2c but I read about the bass problems with the iPod so I'm kinda confused now. I listen mainly to 70's Rock (Pink Floyd, Eric Clapton, Led Zeppelin etc etc). So what...