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O2 AMP + ODAC - Page 166

post #2476 of 5248
Quote:
Originally Posted by Zorrofox View Post


I'm scared to try it. It was so tight in the first place I'm worried if I try it again I might do some real damage. At least at the moment the amp is working fine. Anyway, I had a look at the screws and I don't have whatever tool it takes to get those out. They look like Torx heads but I'm not sure. I'd have to get into town to do something about that.

I'd kinda like to attempt some DIY anyway. This booster board piques my interest, as does the 0 Ohm impedance mod (whatever that is).

 

The screw heads on a head_n_hifi built amp are torx but I'm not sure about the size since I don't have access to the unit atm. Best take the amp to a hardware store and get a fitting torx bit.

 

As for the power plug - as long as wiggling the plug does not make it loose contact or short against the case, I would leave it as is. Btw. did you hear a difference between the stock 4-500mA transformer and the 1000mA one - I'd be most surprised...

 

The O2 has 0.5 ohms output impedance which is good for 4 ohms headphones as per the "1/8 of headphone impedance" rule. Since I don't know any 4 ohms phones... I'm fine with it as is...

 

Joachim

post #2477 of 5248
There was no difference at all, at least to my ears. It was a learning experience though. Who knows, this AC-AC unit may become a collectors piece in the new Europe. I've re-installed the original power supply and no amount of wiggling causes any problems. I'll get into town hopefully later in the week and get a set of Torx heads. It's actually something I've always meant to buy bit I've never gotten around to. I will now. I'd actually be interested to know if there are any other mods which might improve the sound quality...
post #2478 of 5248

There aren't any mods that will improve the audible sound quality of the O2.

 

The design and measurements make it totally transparent...if you don't like to hear what the source material is like then the O2 is not the amp for you.

 

The comments about the crack and other headphones are valid, maybe your taste but not necessarily accurate or transparent.

I have several tube amps, sold most of them due to added coloration...but again you might like that type of sound.

 

There is a booster board that AGDR has designed that helps with power for the other 2% of the cans that the O2 was not designed to drive to their limits.

 

You could order a ac jack from mouser etc....and get it and try your ac adapters in a dry fit....and see if it makes sense to replace the one

on the board.

 

http://www.mouser.com/ProductDetail/Kobiconn/163-7620E-E/?qs=%2fha2pyFaduipJSLWTjADy1%252byZ8QiQUJwx%252biCWTioyxo%3d

 

Alex

post #2479 of 5248

Fyi...the HD650 was a favorite of the original designer....he has write up on his blog if u search...

A.

post #2480 of 5248
That's a fair comment my friend. I don't really know what I was thinking on looking for "better sound" as the transparency and the ethos were the precise reasons I went for the ODAC / XL. I'll have a look for the write-up from the man with no name.
post #2481 of 5248

Hey np!!

 

All is good...

 

There is an ODA type of amp being designed and built by agdr on DIY.

 

It looks like it will be a really nice desktop type similar to the O2 In ways.

 

It has a lot of what was thought might be in the designers desktop version before he left the scene.

 

I will be building one of these....not for any sonic differences but lots of user efficiencies and additions.

 

Enjoy you O2 its a stellar device for sure!!

 

All the best

Alex

post #2482 of 5248
This would explain why agdr knows so much about the O2.
post #2483 of 5248

Yes,

 

Agdr has many posts and discussions on the diy blog with the designer.....very interesting.

 

I think agdr is probably the most knowledgeable engineer that understands the O2 very well inside and out.

 

We all can learn, but some people just have the engineering (electrical) knowledge or nac that most of us never will.

 

Its good he is playing around with the ODA from his perspective...I cant wait to build one.

 

Alex

post #2484 of 5248

I've got HD558 and a Xonar DG.

 

I'm looking for a desktop amp/dac combo with optical input so I can use Dolby Headphone from the DG. I'm looking to spend $100-150 ideally but I'm willing to shell out if I think it's worth it.

 

A second option would be to splurge and get the O2/ODAC combo because I may decide later to grab a pair of Q701. Would it be worth it to get the O2/ODAC over just getting an O2 amp alone?

post #2485 of 5248
Yes, but it only accepts USB in, not optical.
post #2486 of 5248
USB cable - worth spending more?
post #2487 of 5248

Is it a good budget rig for HD800?

post #2488 of 5248
It'll work. Is it good? Imo no, unless you spent all your cash on the headphones and have to live like a pauper for the time being, in which case it becomes a viable option. It's a bit like buying an Audi r8, minus its engine due to lack of cash, then putting in the block of a dodge.
post #2489 of 5248
Quote:
Originally Posted by Xenophon View Post

It'll work. Is it good? Imo no, unless you spent all your cash on the headphones and have to live like a pauper for the time being, in which case it becomes a viable option. It's a bit like buying an Audi r8, minus its engine due to lack of cash, then putting in the block of a dodge.

 

I'll +1 this

 

Living like a pauper (student...) it works, but saving the pennies for an Invicta..

post #2490 of 5248
Quote:
Originally Posted by Xenophon View Post

It'll work. Is it good? Imo no, unless you spent all your cash on the headphones and have to live like a pauper for the time being, in which case it becomes a viable option. It's a bit like buying an Audi r8, minus its engine due to lack of cash, then putting in the block of a dodge.
Quote:
Originally Posted by Eternal Phoenix View Post

I'll +1 this

Living like a pauper (student...) it works, but saving the pennies for an Invicta..

How much power do you guys think is needed to power an HD800?
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