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Firestone BRAVO 24/96 USB transport w/o drivers + reclocker? - Page 29

post #421 of 542
Thread Starter 

Very nice: http://soundapproach.com/wireworldultraviolet5squaredusbdigitalatobusbaudio-p-1496.html

 

Thanks for the link! but shipping to Europe is $99...I'll try to see if a friend could hook me up.

 

It seems that the real world added value of this cable is about:

-SPC, w/ its good and bad sides(skin effect, grossly overpriced)

-24AWG, even though most manufacturers use a smaller gauge(28AWG) for the power lines in order to minimize interferences

-one sided ground, so the cable shielding ground isn't shared between the 2 sides...possibly a m00t point when using an isolator?

 

I'm skeptic...but if I can get one for the price of that US site, I'll bite.

 

I've compared a few cables, the SQ difference between a cheapo 1m and my usual cable(24/28AWG, gold plated, 5ft, ferrite on the device side) is pretty drastic: imagebam.com

 

Just like they advertize for the WW, the sound is noticeably clearer and less harsh...this cable is a fiver on ebay, made by a big chinese OEM(Hongyan). The markup on the WW is ridiculous..at least when I buy isolators I'm buying a circuit, not some copper wires w/ a fancy purple jacket.

 

Still, I've read a USB cables comparison(w/ loudspeakers) on a local forum, it seems that the differences were very very small...yet, the WW Starlight was said to sound clearer than the others.

post #422 of 542
Thread Starter 

I've given the OLIMEX dongle the faraday treatment w/ several layers of self-adhesive aluminium foil...but I don't think I like how it sounds now, I'll try to A/B several times.

 

The C@H dongle does support an external PSU but it can't use the USB power, so it's hard to know how much of an improvement a good PSU actually provides. I think I'll order this regulated PSU, as the external 8>15V(3V overheard, so it should be a decent voltage regulator) PSU is optional on the OLIMEX it should be easy to compare. I've been able to source 24VDC LM317T based linear regulated PSU's, but they don't seem to have them in 8>15V :/

 

The external PSU goes through the dongle voltage regulator instead of going through the power isolator(75mV ripple spec'ed)...this cannot hurt.

 

And if anyone has a 1m WireWorld Ultraviolet A/B cable for trade/sale, please PM.

post #423 of 542
Thread Starter 

OK, the SQ is definitely better to my ears w/o the aluminium foil around the Olimex..so much for faraday insulation.

 

BTW, even an unregulated wall wart is far from the 75/150mV ripple of most power isolators: http://tangentsoft.net/elec/psu-tests/

 

I'm currently using a 14V SMPS wall wart plugged to the Olimex(230V 50Hz around here), the SQ certainly isn't worse. Of course, it goes through the built-in voltage regulator of the dongle...the isolated USB power doesn't(as it's got a min. 3V overhead). This wall wart is plugged onto my computer surge protection thingie, that supposedly lowers EMI/RFI drastically.

 

The price to pay for power isolation is too high IMHO, besides the Bravo coax output is galvanically isolated anyway. I will run more comparisons to be 100% sure.

 

I've also A/B/C'ed the aMG/Olimex and no dongle many many times on several HD-sounding tracks, the sound is very noisy w/o any dongle, better w/ the aMG and even better w/ the Olimex. More natural sounding and vocals are even less sibilating.

post #424 of 542
Thread Starter 

 

Originally Posted by foaming at the ears View Post


Currently I use the HTOmega Claro's coax out to feed my DAC, and it is a very dirty sound (I can hear humming when I move my mouse, and this hum grows louder when my graphics card is fully utilized.).

 

sounds like this would fix your groundloop problem: http://diyparadise.com/shop/index.php?main_page=product_info&products_id=128

post #425 of 542
Thread Starter 
post #426 of 542

Hi leeperry 

 

I think im going to order the olimex board, would you recommend this? Also is it worth me getting one of these 

http://cgi.ebay.co.uk/UK-9V-DC-1A-High-Quality-regulated-power-supply-adaptor-/320645403411?pt=UK_ConsumerElectronics_PowerAdaptors_SM&hash=item4aa7f49313#ht_1346wt_1022

 

to go with it.

 

 

I have also been looking at this:

http://akasa.co.uk/update.php?tpl=product/product.detail.tpl&no=181&type=Cables&type_sub=USB%20Cables&model=AK-PCCU3-02

 

Would you say, there is a reasonable improvement going to a PCi-E card? this one looked interesting as i think it is powered of the molex thanks.

post #427 of 542
Thread Starter 

Hi, well the IC in the PSU's sold by HQPOWER is this one, and the IC used on the OLIMEX PSU input this one.

 

We'd need to find a PSU expert to know what he thinks, but these don't seem like top-of-the-range IC's for audio purposes. The only thing I can say is that I've rolled several PSU's and I'm really stunned by how good the OLIMEX dongle sounds, but I haven't tried any premium USB cable for audio either, so I don't know what would gain you the most...a USB3 board w/ external PSU and/or an audiophile USB cable? I plan on getting a WireWorld UltraViolet anytime soon, time will tell.

 

One thing's for sure, all those external PSU inputs are a good thing, because the USB power is really filthy....even a laptop PSU brick sounds better, especially after the former went through a 75mV ripple power isolator. Ideally you'd want to power a USB3 board from a clean PSU as well, using something like this maybe: http://cgi.ebay.com/5V-9V-12V-DC-Rechargeable-Li-ion-battery-CCTV-cam-/160457580717

 

We might as well bypass the voltage regulator of the OLIMEX board and tap directly a clean 5V(like this battery thingie) to the USB output of his board..hah!

post #428 of 542

Hey leeperry, I need a USB on/off switch for my Bravo so I don't have to unplug the cable to get the optical input working as I am running two different computers through it and it autoswitches with the USB input taking priority. The only one that I can find has been discontinued, have you heard of any other USB inline disconnect switch? The one that I linked to would have been perfect but I can't find anything else like it. All I can find otherwise is hubs and a/b switches, I'm thinking I will have to build one but don't really want to.

 

USB Power OnOff Switch.jpg

No longer in existence?

post #429 of 542
Thread Starter 

you'd have to add a switch on the ground of the cable, hopefully it won't be audible.

 

PC_USB_Connectors_Pinout.png

post #430 of 542

What's the order priority? usb - spdif - coaxial? 
 

Quote:
Originally Posted by grokit View Post

Hey leeperry, I need a USB on/off switch for my Bravo so I don't have to unplug the cable to get the optical input working as I am running two different computers through it and it autoswitches with the USB input taking priority. The only one that I can find has been discontinued, have you heard of any other USB inline disconnect switch? The one that I linked to would have been perfect but I can't find anything else like it. All I can find otherwise is hubs and a/b switches, I'm thinking I will have to build one but don't really want to.

 

USB Power OnOff Switch.jpg

No longer in existence?

post #431 of 542

All the specs say is "Input Select : Auto Select, USB input is highest priority"

post #432 of 542

Thanks for the info, have you check out the Ultravox?

 

http://diyparadise.com/shop/index.php?main_page=product_info&products_id=124

 

Which runs of a battery?

 

I am deciding at the moment weather to order one of those and a battery or the Olimex and a USB 3 PCI-e connector.

 

At the moment, when ever listening from my desktop i get heaps of static, when i plug the DAC in to the laptop everything is fine, hopefully an isolator will sort it .

post #433 of 542
Thread Starter 

Yeah, I'm aware of this dongle. It's using LT1085 on the external PSU input...too bad it doesn't have a female jack on its PSU input, just 2 bare wires.

 

TBH, the Olimex is the cheapest on the market AFAIK, and even when using a 12V laptop brick PSU it still sounds extremely good. You get a rocking USB Isolator for $50 or so. Afterwards, you always have the diminishing returns: using a USB3 board off a 5V battery, getting a snake oil USB cable, using a 12V battery to feed the Olimex...sky's the limit!

 

I was told by a dongle manufacturer that within 3 months he would be releasing a dongle w/ a linear regulated PSU input, and it'll be compatible w/ the cheap 24V chinese linear regulated LM317-T based PSU's I'm getting(the Olimex can't take >15V) , so I'll hold the upgraditis horses until then. SQ is really fantastic atm, no rush for me evil_smiley.gif

post #434 of 542

 

Quote:
Originally Posted by leeperry View Post

you'd have to add a switch on the ground of the cable, hopefully it won't be audible.


Thanks for posting that lp, I appreciate it. It looks like I know what I will make first when I get my soldering station set up.

post #435 of 542
Quote:
Originally Posted by grokit View Post

All the specs say is "Input Select : Auto Select, USB input is highest priority"


do you know which of the optical inputs come next by chance? I'm thinking about using this with a cd player (coaxial and computer s/pdif) then into my dac, but i don't want to go keep un-plugging thigs.

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