Quote: Originally Posted by BrianDonegan The ZapFilter has caps in the path too (I think). It's either going to be a discrete circuit, op-amp or caps to get rid of the offset, take your pick. You could use a TXD module to do it as well. [EDIT] Nope, it doesn't. Just looked. Well, not...

Quote: Originally Posted by billinkansas The enclosed booklet for the 650 says (paraphrasing here because I don't have the booklet anymore) that they are elevated in the bass on purpose to satisfy current musical tastes, or something to that effect. No, it says: "Today many...

People certainly have very different opinions of these headphones. I also happen to own both the HD600 & HD650 atm and I actually find the HD650 to be more 'correct' especially with classical and live music, no contest. The strange thing is my HD650 while darker actually sounds slightly crispier...

I've been listening to my CK2III for over a week now and I absolutely love it with my Senns! The sound is quite 'neutral' and very detailed and good punch. The bass is in no way light but very tight and detailed. I actually think it outperforms my PPAv2 no matter what op-amp I use although I've...

I like the OPA637 a lot and has been one of my favorite opamps for a while now. I recently tried some AD825s and while they are very nice in their own way, I still like the OPA637 better and think it sounds more life-like. And note that I'm using HD650s and HD600s! My favorite opamp right now...

Quote: Originally Posted by majkel BTW, why nobody talks about AD825? It's a killer sounding single op-amp, far more listenable than OPA637 IMHO. I just got my my AD825s and am listening to them right now. I have to admit it sounds very impressive so far. Very good resolution yet...

Well, I have a Galaxy case 4mm x 12.4mm x 17mm and they seem to be internal measurments, BUT the width (12.4mm) is actually more like 10.5mm. The side walls have some kind of slots in them that might let you use 12.4mm if you're lucky but I wouldn't count on it. The slots go deep and wouldn't...

Maybe Digi-key# 345-1023-ND ? I think I'm going to try some of those myself.

Quote: Originally Posted by fillemon but if someone is using a balanced ck2III please let us know how it does, and if there are any complications involved. I had a balanced CK2III for a few months but I decided I actually prefer my PPAv2 with my HD650s so I'm taking it apart and...

I had completely forgotten about this amp until today. I never finished and cased it up because of noise floor problems and the lack of a balanced pot. Today however I decided to redo the buffer using Toshiba 2sc4793 transistors instead of the bd139s. That was quick and easy and I hooked it up...

I owned both for a while and at first I liked the 990 a lot, probably because of the contrast it made to the 650, but I soon noticed that quite often the 990 just sounded funky and strange and lacked a lot of the fullness, richness and organic touch of the 650s. That, combined with the peaky...

Quote: Originally Posted by n_maher I'd very much be interested in hearing about your experience with the JT kit. I've got two on the way. Well, it was a very easy and quite quick build and everything worked fine on first try, but occasionally it will give off a quite loud pop...

Quote: Originally Posted by majkel x2. BTW, try AD825, if you haven't done so far. It's not expensive and maybe you will change your mind regarding OPA637 supremacy? I actually haven't tried the AD825 yet so thanks for the tip. They only seem to be available in smd package...

Quote: Originally Posted by n_maher Well, I'll be interested to see how my experience with Twisted Pear goes, I tried emailing them a couple of times and didn't get a reply so last night I just decided to dump down on the products I wanted and see what happens. I ordered a...

No the opa627/637 does not get brighter in time in my experience. The opa627 sounds smooth and detailed with excellent bass and the opa637 is even better. Imo the opa637 has the least flaws in the sound of all op-amps I've heard and is pretty close to an all-discrete design. To say that the...

Quote: Originally Posted by Ferrari Yes you can, I have also use ultrafast recovery rectifier in my build. For diodes like the MUR820, parallel capacitors (100pF...1nF) can be used the same way as in the Sigma11 PSU. But what is the point of using ultrafast recovery rectifiers...

Quote: Originally Posted by d-cee hi Epicurean try these 0404 PCI config files: http://a-chau.net/0404/ - filenames pretty self explanatory they're setup to output bit perfect to the SPDIF interfaces as well as the onboard DACs without any signal modification at all edit...

Quote: Originally Posted by Ori That's not jitter. The light on the DAC board shows "lock" condition. Your source is possibly not sending data when it has no data (as in mute or between tracks, like many sources) or it sends it at a rate that is significantly off from the "standard"...

It seems that my Zhaolu is very jitter sensitive or something because when I feed it from my computer through either my SBlive 24-bit or my 0404 I get a lot of static especially when the music/sound is quiet or no sound at all. Also, when it happens the Zhaolu dac boards led is blinking rapidly...

The Zapfilter mkII has a dc-servo. I don't have any coupling caps and get less than 1mV offset with both the CS4398 and the AD1852 and I don't think anyone else on this board has had any dc offset problems either.

Quote: Originally Posted by C37 I intend to do the zapmod when my 2.5 arrives as i have one lying here. Ideally i would like the zap to feed directly a pair of active genelecs. I thus need a volume control, ( à la benchmark) In italy the importer is also using the zap as a standalone...

Quote: Originally Posted by Ori THAT IS A FALLACY! If the transmission line is the correct impedance and the terminations are the same, then there will not be any reflections along the transmission line of any arbitrary length. Lengths of 1 or 2 meters do not seem to account for any RF...

Quote: Originally Posted by cotdt it is not as good as the 2.5, basically a castrated version of the 2.5C What makes you think that? From what I can see, they've removed the headphone amp which is a good thing and then they put better or at least better looking connectors on the...

From what I've read, I believe the stock zhaolu digital rca cable is far too short. Yes, that 's right, it should be at least 1m and preferably 2m. The reasoning is that if the spdif driver at the transport end isn't good/fast enough, the signal will bounce back and forth along the cable and...

Quote: Originally Posted by hciman77 However, that does not mean the output levels from the DAC were identical, the output from my external DAC is a full 0.5V higher than the output from the bulit-in DACs on my old NAD or my current Marantz. It doesnt mean there isnt a difference but it...