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Search took 0.12 seconds. Search: Posts Made By: NwAvGuy
Forum: Headphone Amplifiers (Portable) 05-17-2012, 02:03 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
You might want to check out my article: ...

You might want to check out my article:

http://nwavguy.blogspot.com/2012/04/what-we-hear.html

It explains why a lot of people, including those writing reviews at Head-Fi, hear what they hear....
Forum: Headphone Amplifiers (Portable) 04-11-2012, 10:18 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Just a note to say thanks for all the kind words...

Just a note to say thanks for all the kind words here, like those from lorriman above, and sorry I've not had time to keep up with this thread. If anything comes up here that's going unanswered and I...
Forum: Headphone Amplifiers (Portable) 12-27-2011, 11:26 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
@ov_Darkness, the Li-ion issue is complex and...

@ov_Darkness, the Li-ion issue is complex and discussed extensively in the diyAudio O2 thread. The short answer is there's no safe and reasonably priced way to do it because of the O2's need for dual...
Forum: Headphone Amplifiers (Portable) 12-18-2011, 10:00 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
@nupi, The E10 review will likely be in a few...

@nupi, The E10 review will likely be in a few weeks (early January). The O2 can drive a lot of headphones the E10 can't. But if you and your headphones are happy with your E10 don't worry about the...
Forum: Headphone Amplifiers (Portable) 12-14-2011, 08:33 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
You're welcome. Thanks for the kind words. I just...

You're welcome. Thanks for the kind words. I just posted a new review of something a bit different (it's not an iPod at least ;) )
Forum: Headphone Amplifiers (Portable) 12-13-2011, 09:45 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
JDS Labs is selling a fully assembled and tested...

JDS Labs is selling a fully assembled and tested O2 board. From there you can just slip into the the enclosure and buy a ready made front panel from a few different sources. the latest details are...
Forum: Headphone Amplifiers (Portable) 10-04-2011, 09:02 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
The low power gain stage op amp is similar to the...

The low power gain stage op amp is similar to the JRC NJM2068 in terms of overload so there's nothing to worry about there.

As for your Grado headphones, it really depends on your source. If the...
Forum: Headphone Amplifiers (Portable) 09-15-2011, 12:35 PM
Replies: 3
Views: 3,681
Posted By NwAvGuy
Thanks for the great review SpaceTimeMorph. I've...

Thanks for the great review SpaceTimeMorph. I've posted a pic of the final board in the other thread (post 391) (http://anythingbutipod.com/forum/showpost.php?p=574862&postcount=391). The group PC...
Forum: Headphone Amplifiers (Portable) 09-15-2011, 12:27 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Update & Full Size Photo

First, a big thank you to SpaceTimeMorph for his excellent review!

I received the final (fourth) round of prototype O2 PCBs, built up an amp, and it's the best revision yet. A few more little...
Forum: Headphone Amplifiers (Portable) 09-01-2011, 12:40 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
I own the HD650 and the O2 drives them with ease....

I own the HD650 and the O2 drives them with ease. Some of the HiFiMan cans, however, are right at its "design limit". They're among the most difficult to drive headphones I could find anywhere.

I...
Forum: Headphone Amplifiers (Portable) 08-31-2011, 06:31 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Where are you located Rapide? There's now a...

Where are you located Rapide? There's now a European Group Buy (http://www.diyaudio.com/forums/headphone-systems/195573-obtaining-o2-parts-eu.html) for a complete kit.

A lot of DIY projects...
Forum: Headphone Amplifiers (Portable) 08-30-2011, 04:28 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
IMPORTANT: I have revised the PC board to...

IMPORTANT: I have revised the PC board to (hopefully) solve the volume control shortage. There are several other changes/updates as well. The details can be found here...
Forum: Headphone Amplifiers (Portable) 08-30-2011, 12:07 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
IMPORTANT UPDATE: Apparently even an enormous...

IMPORTANT UPDATE: Apparently even an enormous distributor like Mouser can't keep up with O2 demand. :rolleyes: They've sold out of the main volume pot and all the acceptable substitutes. And more are...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 07:33 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
It's hardly exciting, some geeky updates... ...

It's hardly exciting, some geeky updates...

I've finished updating the O2 Measurements (http://nwavguy.blogspot.com/2011/07/o2-headphone-amp.html#measurements) where applicable with the V1.1...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 03:24 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
@mikeaj, agreed. My 21 ohm Super Fi Pro 5's dip...

@mikeaj, agreed. My 21 ohm Super Fi Pro 5's dip to 10 ohms. I'm sure there are plenty of examples and likely even some that might need 400 mV or more. Any portable device with a headphone jack should...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 12:47 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
The most current design documents are all dated...

The most current design documents are all dated August 25th and have all the changes.

The high impedance source issue was resolved by suggesting people ground the enclosure to the input ground...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 11:00 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
More confusion is percolating elsewhere. One...

More confusion is percolating elsewhere. One claim is my design goals for the O2 are somehow misguided and I sacrificed important aspects of the O2's design for a single end goal--namely impressive...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 10:25 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Hopefully my "hype to measurements" ratio is...

Hopefully my "hype to measurements" ratio is better than most and there's lots of real science behind most of it. One of the main goals of the O2 was to avoid the more obvious flaws--like some of...
Forum: Headphone Amplifiers (Portable) 08-27-2011, 05:48 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
AMB says: "Differences between NwAvGuy's and my ...

AMB says: "Differences between NwAvGuy's and my test results are due to several factors -- different equipment, different methodology, different assumptions, and a possibility that his sample of...
Forum: Headphone Amplifiers (Portable) 08-27-2011, 11:18 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
First of all, The Mini3's performance, and the...

First of all, The Mini3's performance, and the credibility of AMB is only on the table because AMB has personally attacked the O2 in some very misleading ways and made arguments the Mini3 is a...
Forum: Headphone Amplifiers (Portable) 08-26-2011, 06:36 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Yeah, "what the... ?" exactly! It doesn't make...

Yeah, "what the... ?" exactly! It doesn't make sense to me how someone would be oh so detailed down to drawing pretty pictures of the test set up, quoting the model numbers of every piece of...
Forum: Headphone Amplifiers (Portable) 08-26-2011, 03:25 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Thanks b0ck3n :) Apparently the latest...

Thanks b0ck3n :)

Apparently the latest confusion on Heavily-Funded is regarding the O2's crosstalk. This is already documented in various places on my blog but it's kind of spread around. So just...
Forum: Headphone Amplifiers (Portable) 08-26-2011, 04:53 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
I removed the price from the summary article....

I removed the price from the summary article. Hopefully the O2's in the wild can go hunt down some more expensive amps and my $500 blind challenge stands. Even if nobody takes me up on the challenge...
Forum: Headphone Amplifiers (Portable) 08-26-2011, 12:10 AM
Replies: 490
Views: 101,701
Posted By NwAvGuy
Sorry if the comparison bothers you Khaos. I'm...

Sorry if the comparison bothers you Khaos. I'm really not trying to be disingenuous. One of the most important attributes for a reference product to compare aginst is that it's widely known which...
Forum: Headphone Amplifiers (Portable) 08-25-2011, 10:56 PM
Replies: 490
Views: 101,701
Posted By NwAvGuy
The O2 Documentation Package has been revised....

The O2 Documentation Package has been revised. There's a new PDF, spreadsheet and the PC board files have been revised as well. This is hopefully the final version and what 200-some people will be...
Showing results 1 to 25 of 176
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