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Speaker amps for headphones - Page 127

post #1891 of 3116

While I'm waiting for my TBI Millenia I already built the resistor box(balanced) to use with my LCD3.  My question is can I use the box with my current unbalance amplifier(I checked the negative polls and they are connected)? Or can I use the balanced box with a single ended jack(I'm thinking of just temporary joining the negatives) 

post #1892 of 3116
Quote:
Originally Posted by m17xr2b View Post
 

While I'm waiting for my TBI Millenia I already built the resistor box(balanced) to use with my LCD3.  My question is can I use the box with my current unbalance amplifier(I checked the negative polls and they are connected)? Or can I use the balanced box with a single ended jack(I'm thinking of just temporary joining the negatives) 

Yes, it's OK to use a balanced box & headphones with a common ground amp, but you can't use single ended phones with a balanced amp without some type of protection circuit.

post #1893 of 3116
Quote:
Originally Posted by brunk View Post
 

Don't forget to twist those corresponding pairs really good too! ;) 

 

EDIT: Are you using a plastic or metal box for this? You may want to get some copper foil if plastic to at least provide a little shielding, and you can wrap it around the wires too.

Yea, twisting is a good idea--it looks good too. I'm using an aluminum project box for the looks and shielding.

post #1894 of 3116
Quote:
Originally Posted by brunk View Post
 

Can you link the switch in question?

Here you go.  NKK S42-RO 4PDT

post #1895 of 3116
Quote:
Originally Posted by potterma View Post
 

Here you go.  NKK S42-RO 4PDT

Well, my only guess is because of all the different metals involved perhaps? :confused_face_2: I gleaned this from the data sheet:

post #1896 of 3116
Quote:
Originally Posted by brunk View Post
 

Well, my only guess is because of all the different metals involved perhaps? :confused_face_2: I gleaned this from the data sheet:

Maybe...  Do you have a better NKK series to recommend?  I'm thinking good quality rotary switch would be an option instead of a toggle...

post #1897 of 3116
Quote:
Originally Posted by potterma View Post
 

Maybe...  Do you have a better NKK series to recommend?  I'm thinking good quality rotary switch would be an option instead of a toggle...

No, I don't really have a specific series, I just have never run into issues with them...yet. Rotary is certainly an option, but the problem I have with them in this scenario is that they aren't great visual indicators unless you have a large arrow-like knob.

post #1898 of 3116
Quote:
Originally Posted by Armaegis View Post

 

"is he serious?" option: wired in reverse... http://www.zeroimpedance.com/Zero-New.html

 

 

I still think y'all are drinking the kool-aid.

 

OK, I'm convinced.  Anyone interested in using resistors between the amp and drivers should read this page:
 
 
And the FAQ:
 
 
This guy is not only innovative, his explanations are very well written - its an enjoyable read, and very informative! 
 
Mike

Edited by zilch0md - 12/14/13 at 4:21am
post #1899 of 3116
Quote:
Originally Posted by zilch0md View Post
 
OK, I'm convinced.  Anyone interested in using resistors between the amp and drivers should read this page:
 
 
And the FAQ:
 
 
This guy is not only innovative, his explanations are very well written - its an enjoyable read, and very informative! 
 
Mike

Sweet! I love the idea of spending the money for a nice OTL (output transformer less) tube amp and then adding a transformer to it for only $540 with FREE shipping. It has silver wire and skin effect enhancing stranded coil wire--what a great idea. I'm in. How about a group buy!  :veryevil:

post #1900 of 3116

Oh, I hear you, Rob!   Your sarcasm is much appreciated!  :D

 

I'm not likely to order a pair of those Zero's, ever - they're just too expensive.  But the article is very compelling, nevertheless - and edifying.

 

Mike

post #1901 of 3116
It's not the money here , it's in my situation not something I want to do. Having owned speakers with low imp, the auto trans is used to compensate
For the lack of a amp up to the task. I own krell,s as well as aragon amps both designed to handle 1 ohm loads.

I know some people here want a really large amp to use with headphones. And I get this as I have a couple. But resistors are relatively safe to play with.
As it not playing loud enough or to loud to soon as being the side effects . But using an toroidal style auto trans former . Well you people are going down the road
To pending doom with a small miscalculation . So not with my headphones..... The reason is that now you have to calculate both input and output
Power and you have no real safeguard as in lowering the volume. As even with the volume down you could still damage the amp.

How ever I think it is an idea I will follow just not with my headphones lol. One last point as this was a way to cheat on a cheaper amp with speakers
And speakers have a true imp. Where planers are mostly not. I say we do. Ot know how it will effect the sound either.

Great reading though. And maybe some others can way in on this as I do not claim to have amp design experience. Just a guy buying stuff .

Al d
post #1902 of 3116

Yeah, I have to agree with robrob and zilch0md here. There's enough power going through the resistors to drive the headphones. Am I really going to notice the difference of the extra headroom? Is the $500 price tag worth it over the pennies of resistors? Right now, my answers are NO.

 

If the autoformers were more in line of say, $75-125 each i would consider checking them out to satiate my curiosity, but not $500+ for a pair.


Edited by brunk - 12/14/13 at 9:36am
post #1903 of 3116
Quote:
Originally Posted by robrob View Post
 

Sweet! I love the idea of spending the money for a nice OTL (output transformer less) tube amp and then adding a transformer to it for only $540 with FREE shipping. It has silver wire and skin effect enhancing stranded coil wire--what a great idea. I'm in. How about a group buy!  :veryevil:

 

An autoformer is not the same as a transformer.

 

 

And good iron is expensive. That's the nature of the beast. Yet people will use them because they sound good and perform well, and in most amp designs the cost of the iron will probably be the biggest chunk on the bill of materials (except maybe fancy casework). $450 shipped for a pair isn't that crazy in the grand scheme of things. Big transformers easily go far far higher. I'm not schilling for them; people can make their own choices. Try buying iron yourself, much less getting custom wound stuff and see how much it costs.

post #1904 of 3116
Its not the price that bugs me its concept of the use.

Al
post #1905 of 3116
Quote:
Originally Posted by brunk View Post
 

Yeah, I have to agree with robrob and zilch0md here. There's enough power going through the resistors to drive the headphones. Am I really going to notice the difference of the extra headroom? Is the $500 price tag worth it over the pennies of resistors? Right now, my answers are NO.

 

If the autoformers were more in line of say, $75-125 each i would consider checking them out to satiate my curiosity, but not $500+ for a pair.

 

 

Gotta say I agree, I'd stick with resistors.

These are really for driving loudspeakers.

 

Quote:
Originally Posted by Armaegis View Post
 

 

An autoformer is not the same as a transformer.

 

 

And good iron is expensive. That's the nature of the beast. Yet people will use them because they sound good and perform well, and in most amp designs the cost of the iron will probably be the biggest chunk on the bill of materials (except maybe fancy casework). $450 shipped for a pair isn't that crazy in the grand scheme of things. Big transformers easily go far far higher. I'm not schilling for them; people can make their own choices. Try buying iron yourself, much less getting custom wound stuff and see how much it costs.

 

To be ultra uber super precise, an Autotransformer is actually a "sub-species" of the transformer family.

A "normal" transformer has two isolated windings, the "Auto" only has one.

Bit it's still a transformer.


Edited by Chris J - 12/14/13 at 11:01am
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