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 107

post #1591 of 2717
Quote:
Originally Posted by Steve Eddy View Post

*still scratching his head wondering what the benefit is of complicating things with a four resistor solution*

se

yup...

post #1592 of 2717
How about a variable resister pot in two places. Wire wound of course...

Al D
post #1593 of 2717
Quote:
Originally Posted by ALRAINBOW View Post

As I can follow the the topic here and have intention of using this topic for myself, so great info and thanks to all...I can add only this .

With respect to all here in this testing , where is the listening test,s . That is what this is really about. I think a better approach to this would be design , implement , listen , post.

Using this method we would understand the relationship to use better.

Just a thought , great reading...

Al D

I agree with your thought: design, implement, listen, post.  BUT  you gotta get through design, first!  If you can't finish the design, you can't implement, you can't listen, so, you post to get help with design!

post #1594 of 2717
Quote:
 Nope.  Gotta consider the headphones if you want to be close to calculating attenuation right....

 

OK, so with an amp with 8 ohm load impedance connected directly to headphones with 600 ohms impedance how would you calculate the attenuation?

 

How would you calculate it with a 4 resistor network?

post #1595 of 2717
I understand your statement , and as I am not doing it I am not complaining. I was trying to help. And my real point is listen as soon as possible for the sound may not change even after you creat the bridge. You guys are not designing for a criteria that you know will have the correct effects you wish. . As I have played with resisters and headphones with some amps I have . About four in total and the resisters do not effect the sound once you do a simple imp match with the amp,load. After that not much happens. No damping effect that I can hear either.

And now I will just read and listen guys. ..

Al D
post #1596 of 2717

@robrob Thanks for taking the time to flesh all this out on a spreadsheet! If you wouldn't mind creating a wiki article here on Head-Fi when you're done, that would be really helpful for alot of people in the present and future :)

post #1597 of 2717
Quote:
Originally Posted by zilch0md View Post

I came very close to settling on Mills wirewound resistors while researching brands yesterday.  After reading in a couple of different DIY threads discussing the "sound" of various resistors, that the Vishay Dale resistors are "silent," having already seen them ranked high in similar threads, I decided to go with Vishay Dale instead of Mills.  Truth be known, they're indistinguishable to my ears, but I'm not going to spend money to find out.

The only noise a resistor produces is thermal noise which is a function of its resistance and temperature. So a 50 ohm Mills would be just as "silent" as a 50 ohm Dale.

By the way, just found out today that Vishay owns Mills now. They were owned by Huntington Electric, but Vishay bought up the whole group. Soon Vishay will own everything.

se
post #1598 of 2717
Quote:
Originally Posted by potterma View Post

yup...

I guess because 4 is a bigger number than 2 or 1 so it must be better. Maybe I'll get the boys in the lab to start working on an 8 resistor solution and stay ahead of the competition. biggrin.gif

se
post #1599 of 2717
Quote:
Originally Posted by robrob View Post
 

 

OK, so with an amp with 8 ohm load impedance connected directly to headphones with 600 ohms impedance how would you calculate the attenuation?

 

How would you calculate it with a 4 resistor network?

Sorry, I'm afraid I don't understand the first question... What is the configuration?

 

If you have 600 ohm headphones, your attenuation calculation will be much less dependent on having the load there versus without it (in the 4 resistor configuration).

The full blown calculation is in post #1580

 

For all practical purposes, you can ignore the output impedance of the amplifier.  The amp, at some volume setting, is going to output some voltage at the speaker taps.  That appears across R1.  The only thing you care about is what happens after that.

post #1600 of 2717
Quote:
Originally Posted by Steve Eddy View Post


I guess because 4 is a bigger number than 2 or 1 so it must be better. Maybe I'll get the boys in the lab to start working on an 8 resistor solution and stay ahead of the competition. biggrin.gif

se

Let us know how it sounds, Mr Eddy!  ;)

post #1601 of 2717
Quote:
Originally Posted by Steve Eddy View Post


The only noise a resistor produces is thermal noise which is a function of its resistance and temperature. So a 50 ohm Mills would be just as "silent" as a 50 ohm Dale.

By the way, just found out today that Vishay owns Mills now. They were owned by Huntington Electric, but Vishay bought up the whole group. Soon Vishay will own everything.

se

And soon, the only brand in the world will be ThermoFisherHuntingtonMitsubishiCokaCola!

post #1602 of 2717
Quote:
Originally Posted by potterma View Post

And soon, the only brand in the world will be ThermoFisherHuntingtonMitsubishiCokaCola!

You think? I suspect it will be Brawndo, because you know, Brawndo has electrolytes. tongue.gif

se
post #1603 of 2717
Quote:
Originally Posted by Steve Eddy View Post


I guess because 4 is a bigger number than 2 or 1 so it must be better. Maybe I'll get the boys in the lab to start working on an 8 resistor solution and stay ahead of the competition. biggrin.gif

se

 

 

I was thinking of posting a wheatstone bridge with the headphone in the middle... but I wouldn't want Mike's head to explode :dt880smile:

post #1604 of 2717
Quote:
Originally Posted by ALRAINBOW View Post

How about a variable resister pot in two places. Wire wound of course...

Al D

I have been talking to the person who designed my amp about begin able to adjust the resistance.  here is what he suggested (planned for january when i send my amp in for some updating)

 

I think using a 6 position rotary switch and install various resistors on the switch is a better way to go in term of having different resistance between the amp and the headphone. I have spent a couple of night trying to find the suitable variable resistor. The major issue is there isn't any suitable dual gang unit out there. There are a lot of precision single gang unit which is not suitable in stereo operation. So here is my suggestion.

Using one 6 positions rotary switch and a bypass switch. Steps for the resistance is going to be 5 ohms, 10 ohms, 15 ohms, 20 ohms, 30 ohms, 50 ohms plus bypass.

 

there also would be an 8 ohm resistor (on/off) for use with tube amp.  

post #1605 of 2717
Quote:
Originally Posted by Armaegis View Post


I was thinking of posting a wheatstone bridge with the headphone in the middle... but I wouldn't want Mike's head to explode dt880smile.png

"I don' know whuh happun'. Alla sudden, he haid, it jes' 'sploded!"

biggrin.gif

se
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