Head-Fi.org › Forums › Summit-Fi (High-End Audio) › High-end Audio Forum › Speaker amps for headphones
New Posts  All Forums:Forum Nav:

Speaker amps for headphones - Page 24

post #346 of 2933
Quote:
Originally Posted by Gary in MD View Post

I will never doubt you power cord believers again. 

 

Gary

 

I can't wait to hear the details of this story!  biggrin.gif   

 

Actually, I consider ALL of your posts to be the most entertaining on Head-Fi.  The telling of your quest is better than a good book!  Do take your time! 

 

popcorn.gif

post #347 of 2933
I won't paste this in the science forum for taunting. biggrin.gif
post #348 of 2933
Quote:
Originally Posted by Happy Camper View Post

I won't paste this in the science forum for taunting. biggrin.gif

 

The Science Forum guys would go nuts!
post #349 of 2933
+1 biggrin.gif
post #350 of 2933

Unfortunately, I consider myself one of those science guys (don't believe in expensive cables, etc.) but it is clear that there is some electromagnetic noise either in the Millennia adapter or from one of the multitude of amps, pre-amps, etc. that I currently have powered within 3 feet of each other.  There's also the possibility that the power strip with all of its outlets filled was creating noise.  All I know is that when I put the little guy on internal power, he thanked me by not making noise any more.

 

I am sad to announce there will be no report tonight.  I have followed Prepro's advice and taken extensive notes of the past 2 days of comparing the Emo and the MJ, and now I just don't have the time or energy to go through my little blurbs and do a good job of writing a report.  So I'm going to bed soon, and if I survive spraying the orchard tomorrow in 90-degree heat while wearing a full Tyvek bunny suit, then I will spend tomorrow afternoon and evening writing up my next great masterpiece.  Then I'll throw in a bonus write-up of the TBI, maybe even a comparison of the sound using the AC adapter vs. batteries, if I get a chance to do a detailed comparison.

 

Thanks for your patience...

 

Gary

post #351 of 2933
Our pleasure!!
post #352 of 2933
Quote:
Originally Posted by Gary in MD View Post

Unfortunately, I consider myself one of those science guys (don't believe in expensive cables, etc.) but it is clear that there is some electromagnetic noise either in the Millennia adapter or from one of the multitude of amps, pre-amps, etc. that I currently have powered within 3 feet of each other.  There's also the possibility that the power strip with all of its outlets filled was creating noise.  All I know is that when I put the little guy on internal power, he thanked me by not making noise any more.

 

I am sad to announce there will be no report tonight.  I have followed Prepro's advice and taken extensive notes of the past 2 days of comparing the Emo and the MJ, and now I just don't have the time or energy to go through my little blurbs and do a good job of writing a report.  So I'm going to bed soon, and if I survive spraying the orchard tomorrow in 90-degree heat while wearing a full Tyvek bunny suit, then I will spend tomorrow afternoon and evening writing up my next great masterpiece.  Then I'll throw in a bonus write-up of the TBI, maybe even a comparison of the sound using the AC adapter vs. batteries, if I get a chance to do a detailed comparison.

 

Thanks for your patience...

 

Gary

Take care, Gary!  Look forward to the next installment.  Is tje Millennia powered with a wall wart when in external power?  I've had a lot of problems with conducted AC with wall warts.  Lots of AC where there was only supposed to be DC...

post #353 of 2933
Quote:
Originally Posted by Gary in MD View Post

Unfortunately, I consider myself one of those science guys (don't believe in expensive cables, etc.) but it is clear that there is some electromagnetic noise either in the Millennia adapter or from one of the multitude of amps, pre-amps, etc. that I currently have powered within 3 feet of each other.  There's also the possibility that the power strip with all of its outlets filled was creating noise.  All I know is that when I put the little guy on internal power, he thanked me by not making noise any more.

 

I am sad to announce there will be no report tonight.  I have followed Prepro's advice and taken extensive notes of the past 2 days of comparing the Emo and the MJ, and now I just don't have the time or energy to go through my little blurbs and do a good job of writing a report.  So I'm going to bed soon, and if I survive spraying the orchard tomorrow in 90-degree heat while wearing a full Tyvek bunny suit, then I will spend tomorrow afternoon and evening writing up my next great masterpiece.  Then I'll throw in a bonus write-up of the TBI, maybe even a comparison of the sound using the AC adapter vs. batteries, if I get a chance to do a detailed comparison.

 

Thanks for your patience...

 

Gary

 

 

basshead.gif

post #354 of 2933
Quote:
Originally Posted by potterma View Post

Take care, Gary!  Look forward to the next installment.  Is tje Millennia powered with a wall wart when in external power?  I've had a lot of problems with conducted AC with wall warts.  Lots of AC where there was only supposed to be DC...


It looks like a PC power adapter:  cord from the outlet attaches to a rectangular transformer box, then another cord with a 2.5mm plug on the end attaches to the amp. 

post #355 of 2933

"Rectangular transformer box" sounds like a switchmode power supply (as opposed to a linear power supply).  

 

It's my understanding that switch mode power supplies can be a source of noise.   Jan Meier (of Meier Audio) advises they not be used with his portable amps, but Centrance ships one with their DACmini CX.

 

Mike

post #356 of 2933
Quote:
Originally Posted by zilch0md View Post

"Rectangular transformer box" sounds like a switchmode power supply (as opposed to a linear power supply).  

 

It's my understanding that switch mode power supplies can be a source of noise.   Jan Meier (of Meier Audio) advises they not be used with his portable amps, but Centrance ships one with their DACmini CX.

 

Mike

Yes, switch mode PS is very efficient, but lots of noise.  An inductor on the connector end can help with the noise a bit.

post #357 of 2933
Don't rush on our account Gary. This is only head-fi, not real life biggrin.gif We children have to learn to wait for our treats wink.gif
post #358 of 2933
Quote:
Originally Posted by Gary in MD View Post


It looks like a PC power adapter:  cord from the outlet attaches to a rectangular transformer box, then another cord with a 2.5mm plug on the end attaches to the amp. 

Here's one way to cipher out if it's a Switchmode Power Supply:

Is the voltage range on the box 90-264 Vac, 45-65 Hz?
Then it is a Switchmode Power Supply.
If it also feels reasonably light for it's size and doesn't get too hot then it might be a Switchmode Power Supply.

On the other hand, if it has an engine block hanging from a tree in it's front yard, it might be a redneck (sorry about that last one!) redface.gif

That's actually more than one way.......again, sorry!

I'm sure everyone here has noticed that a lot of phono pre-amps are starting to use batteries instead of a line cord to power the phono pre-amp, obviously this is to avoid the pitfalls with line cords and various power supply schemes and all the noise problems they create.
Edited by Chris J - 7/5/13 at 5:39pm
post #359 of 2933

Voltage is 100-240, 47-63 Hz, 2A.  Output 24vdc, 2.7A, max 65W.  It's significantly heavier than an HP laptop power supply.  I would read you the Chinese characters on it, but, well, I can't... sorry.

 

And there will be another day's delay in my next report.  Spraying the orchard took ~7 hours in >90-degree heat in the Tyvek suit with the full face mask. Having a hard time typing because of hand cramps.

 

I love the fruit, but my hobby orchard is turning into a job, and that ain't right.  Oh well, here's hoping I can get some sleep.  Nothing like waking up multiple times with cramping legs, feet, hands, stomach muscles... even my style... but never my ears.  Ooof, what a ridiculous thing to write.  Oh well, I've had a tough day, so I guess I have an excuse.

 

Listening to the Burson now, because it has to go back early next week.  My brief description would be: very nice.  Not the most exciting date at the dance, but kinda grows on you.  More details to come.  After the previous details I promised you but haven't delivered yet.

 

Gary

post #360 of 2933

At least you have something wonderfully relaxing and fun to look forward to after what sounds like hellaciously unfun work... An hour of great music and a New Belgium Brewing 1554 or two later and you'll be greatly improved ;). Take your time, and thanks for all the work you've done thus far-- it's been a great read!! 

 

beerchug.gif

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: High-end Audio Forum
Head-Fi.org › Forums › Summit-Fi (High-End Audio) › High-end Audio Forum › Speaker amps for headphones