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Search: Posts Made By: mikeaj
Forum: Headphone Amplifiers (Portable) 08-29-2011, 02:50 PM
Replies: 493
Views: 128,653
Posted By mikeaj
By the way there exist IEMs with nominal...

By the way there exist IEMs with nominal impedance under 16 ohms. Some listed at 16 ohms are undoubtedly below that at some frequencies of course. This is just through a quick check through the...
Forum: Headphone Amplifiers (Portable) 08-29-2011, 11:43 AM
Replies: 493
Views: 128,653
Posted By mikeaj
Yeah, simplest explanation is just that whatever...

Yeah, simplest explanation is just that whatever load the amp was seeing was a lot higher than 33 ohms. Seems like a quick sanity check would be just to measure the voltage across the resistor...
Forum: Headphone Amplifiers (Portable) 08-27-2011, 03:19 PM
Replies: 493
Views: 128,653
Posted By mikeaj
WAIT A SEC. I just took another look at the...

WAIT A SEC.

I just took another look at the AMB site. Here's the test setup:
http://www.amb.org/audio/mini3/
http://www.amb.org/audio/mini3/rmaa_test.png

Is the test load in SERIES with the...
Forum: Headphone Amplifiers (Portable) 08-27-2011, 02:14 AM
Replies: 493
Views: 128,653
Posted By mikeaj
This is ancient history, but while we're on the...

This is ancient history, but while we're on the subject...a few months back during the Mini^3 debacle, I got some PMs in another (non-audio) forum relating to this subject. I had posted a link to...
Forum: Headphone Amplifiers (Portable) 08-24-2011, 12:17 AM
Replies: 493
Views: 128,653
Posted By mikeaj
Yeah the calculations on the diode are not the...

Yeah the calculations on the diode are not the big deal. Some part of me just wants to see him admit he's wrong once after he asks us to show him. It's a healthy exercise for all involved. :o
...
Forum: Headphone Amplifiers (Portable) 08-23-2011, 11:47 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Well to be fair, Ti Kan was responding to...

Well to be fair, Ti Kan was responding to somebody paraphrasing your statements, so it was missing the technical details. Then again, he really should be reading straight from the source or posting...
Forum: Headphone Amplifiers (Portable) 08-19-2011, 11:26 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Don't blame it on the imps, the poor critters! ...

Don't blame it on the imps, the poor critters! Seriously though, it seems to be an issue with the way the gain setting is implemented instead.

300 ohms, bass 0, CF 0, gain variable, imp 0...
Forum: Headphone Amplifiers (Portable) 08-19-2011, 07:05 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Indeed it seems many companies like to flaunt...

Indeed it seems many companies like to flaunt their name-brand components, but who knows how the performance really is.

btw for those wondering, I think you're talking about this:...
Forum: Headphone Amplifiers (Portable) 08-16-2011, 04:11 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Where was that list of nonstandard hot sources? ...

Where was that list of nonstandard hot sources? Quick, we need to compile a list of sources with good "synergy" with the O2! Uh, make sure to set the gain too high and then as the battery drains......
Forum: Headphone Amplifiers (Portable) 08-15-2011, 09:09 AM
Replies: 493
Views: 128,653
Posted By mikeaj
Well let's be realistic. If you already own some...

Well let's be realistic. If you already own some sources, certainly you would want an amp that plays nice with all of them. Regardless of which is "standard" (and there's not really a standard),...
Forum: Headphone Amplifiers (Portable) 08-11-2011, 06:16 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Well, whatever you do regarding the comments spam...

Well, whatever you do regarding the comments spam is up to you. Personally, I agree with censorship to keep out the trash. It's just censoring constructive information and useful posts that...
Forum: Headphone Amplifiers (Portable) 08-10-2011, 12:35 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Maybe you should just run it through RMAA (with...

Maybe you should just run it through RMAA (with all the usual caveats) so people have a "reference" figure. Not that I think it's more meaningful than what's written in the first article, but RMAA...
Forum: Headphone Amplifiers (Portable) 08-10-2011, 10:28 AM
Replies: 493
Views: 128,653
Posted By mikeaj
There is variable gain using a pot, apparently...

There is variable gain using a pot, apparently implemented in a better way than most--see design docs. There's just also two fixed baseline gains that can be switched between with a switch on the...
Forum: Headphone Amplifiers (Portable) 08-10-2011, 02:06 AM
Replies: 493
Views: 128,653
Posted By mikeaj
re: noise (please correct me if I say something...

re: noise (please correct me if I say something stupid; it's 3am and maybe I ought to get to bed)

I think in many practical scenarios, the O2 or another external amp can effectively reduce the...
Forum: Headphone Amplifiers (Portable) 08-02-2011, 06:49 PM
Replies: 493
Views: 128,653
Posted By mikeaj
Hi, NwAvGuy minion reporting in. :P I like...

Hi, NwAvGuy minion reporting in. :P

I like the site and have been here before, but I couldn't remember if I had an account, so I just created one.



I've soldered various pieces and...
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