Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp - Page 549

Not necessarily. But yes, with coax you can use 192KHz with the ZERO, optical you will be limited to 96KHz, not that I would use 192KHz, I wouldn't (I have no recordings at such values), and I happened to be a believer in bit-perfect, so, no upsamples over here.

More important reasons would be that most optical cables are made of POF (Plastic Optical Fiber), and for that reason alone they are lossy.

Other problem with POF is that a typical plastic based TOSlink has 5MHz to 6MHz of bandwidth, but for instance you require a minimum of 9Mhz Bandwidth for 16 bit LPCM...

And a citation that points to this bandwidth problem, quoting from the Rémy Fourré Stereophile article "Jitter and the Digital Interface" published in the October, 1993 issue:
So, to get the bandwidth needed you need a glass based fiber cable, a quality one, that can be expensive, and the cable will be more fragile (the main reason why POF is use on most cables, it is more rugged).

Coax cables are easily accessible, have more bandwidth, are rugged, the connections are better (RCA or BNC) and in general less problematic, so, among other reasons this is why coax is recommended.

The Xitel is kinda sucky (adds lots of jitter), I would recommend a better soundcard or a transport like this one: http://www.audiophilechina.com/cp-sh...S_id2=77&s_id= (This option is limited to 48/16 FYI)

Just want to say, i replaced those NE5532 op-amps with these LT1364 today, and i like this sound very much with DT-770 Pro. OPA627 + LT1364 indeed Great!

Anybody tried OP627 on Zero HP section ??..

Penchum did in his review. Check the very first post.

That page I know by heart!! but I think he had written about combinations with 627 on the DAC, but since I have 2 spare 627 on browdogs, courtesy wsz, as he sent me a full replacement boards with opamps, and with my moon HDAM from GD Audio on the way, I was wondering how the 627s would sound on the amp section, currently I have LM4562s...

PS. good to see your Lavry gone before Christmas..

Re the hum issue, I don't hear it from the speakers or 'phones, but the machine itself does have slight audible hum from about 4 feet away. It should be dead silent, right? Strange thing is, I think it was silent out of the box, but one day I happened to notice it, before reading about the problem here. Mine's from wsz.

Thanks.

Could one of you Electronics Guru's explain how a transformer can make a Mechanical vibration? I don't understand how that happens. It does, I just don't get it.

Transformer Noise Chapter 1 (Causes are addressed from Chapter 2 onwards)

Not sure where it is exactly in the thread, but yes, Pench (and others) tried the 627 in the amp section with less than stellar results - but hey - if you have them why not just try for yourself? Noone knows better than your own ears!

Good article, it's a wonder any of them are quiet!

Hi, here is the thing: i am french and study in canada, i plan on buying the zero for xmas....but there is no switch for the voltage and since i am to leave for france in like 6 months i d like to use the zero in both countries (110v and 220v). So i decided to buy a power converter like this one:110-220 & 220-110V European Travel Power Converter 100w - eBay (item 270301058886 end time Dec-10-08 16:42:38 PST)

Is 100 watts enough to drive the zero? May i damage it using a power converter?

thanks

100 watts is enough.
Why doesn't it have a power selector to switch between 110-220volts?

Actually the ZERO has "the switch" 110v-220v, mine certainly did, so you can use this unit worldwide without any power converter, you just have to flip the switch and use the proper cable for the country, and be careful, make sure you have the right setting before you turn on the unit.

Have a look: tianyun100.com

really? strange, the ebay dealer specifically ask you to decide between the two options....its the upgraded option with the opa627...maybe its not available anymore....kinda suckx if that's the case
i guess i'll ask the dealer
thank you for your replies

edit: http://cgi.ebay.com/ws/eBayISAPI.dll...ayphotohosting

you can see there is no longer a switch
i guess a power converter will not give a quite 'steady' current, which may alter the sound a bit, but i don' want to invest in a more refined converter

I had a look on ebay, and wsz0304 (and probably others) from the pictures sells a version that does not have this capability.

I purchased mine from audiophilechina, and mine did have the switch like the one you see in the manufacturer website.

Anyway, audiophilechina asks the same question, but only to make sure they send you the unit with the right setting and avoid you blowing up the unit, because many would not care to check it and would just leave it as the manufacturer ships.

Ask your ebay seller if the version they sell has the switch, the pictures may be from an older (or newer) version that would not have this capability.