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Speaker amps for headphones - Page 72

post #1066 of 2665
:-)
post #1067 of 2665
Quote:
Originally Posted by brunk View Post


Resistance is the first stage of converting herd mentality. It's too bad people are not more open-minded. Has anyone told them their headphone amps are mini versions of regular amps with a headphone jack?

Oops!
Sorry for the double post, I missed this earlier........redface.gif

I certainly agree with this one!
There was one guy in another thread who was very surprised when I pointed out to him that there is almost no difference between a pre-amp line stage and a headphone amp.
The headphone amp will have a lower output impedance and (usually) a higher output current rating.
In fact, in the Audiolab M-DAC, the line out and headphone out are one and the same.
The Bryston BHA-1 schematic looks extremely similar to a Bryston line stage, biggest difference is the output transistors.

Now increase the available output voltage and output current and what do you get?
Hmmmmm.........could it be an audio power amp?
post #1068 of 2665

Hey Chris. Yeah I agree about all the marketing hokum too, but i do think there is some truth in the reasoning, just buried under alot of BS lol. Yeah once someone realizes they can use a traditional amp for their headphones, it can open up a world of opportunities for their budget that no boutique headphone amp shop can compete with. Plus, it's a perfect excuse to buy some speakers =P

post #1069 of 2665
Quote:
Originally Posted by Chris J View Post


Oops!
Sorry for the double post, I missed this earlier........redface.gif

I certainly agree with this one!
There was one guy in another thread who was very surprised when I pointed out to him that there is almost no difference between a pre-amp line stage and a headphone amp.
The headphone amp will have a lower output impedance and (usually) a higher output current rating.
In fact, in the Audiolab M-DAC, the line out and headphone out are one and the same.
The Bryston BHA-1 schematic looks extremely similar to a Bryston line stage, biggest difference is the output transistors.

Now increase the available output voltage and output current and what do you get?
Hmmmmm.........could it be an audio power amp?

Yeah, but I heard that somebody's girlfriend's friend's father got syphillis from using a speaker amp with his headphones... ...well at least that's what he told his wife...

 

But only slightly more seriously, anybody who wants to join me in the crusade on the "Amp recommendations for LCD-3" should feel free to jump right in:atsmile:...

post #1070 of 2665
Quote:
Originally Posted by Gary in MD View Post

Yeah, but I heard that somebody's girlfriend's friend's father got syphillis from using a speaker amp with his headphones... ...well at least that's what he told his wife...

But only slightly more seriously, anybody who wants to join me in the crusade on the "Amp recommendations for LCD-3" should feel free to jump right in:atsmile: ...

Hmmmmm, I seem to remember driving my 2,000 Ohm Sennheisers with a 250 Watt into 8 Ohms amp, no humans, headphones or animals were harmed in this experiment! rolleyes.gif

I don't know that much about LCDs, so I will try to stay out of that!
However........a friend of mine owns a pair of LCDs, he once commented that there were a few people who had commented that YOU MUST drive LCDs with a 3 or 4 Watt amplifier...............so I guess we are to assume that 30 Watts is too much and 300 milliWatts is not enough! tongue.gif
Quote:
Originally Posted by brunk View Post

Hey Chris. Yeah I agree about all the marketing hokum , but i do think there is some truth in the reasoning, just buried under alot of BS lol. Yeah once someone realizes they can use a traditional amp for their headphones, it can open up a world of opportunities for their budget that no boutique headphone amp shop can compete with. Plus, it's a perfect excuse to buy some speakers =P

When I get some spare time, I'm going to read up on the Lightspeed, the concept intrigues me.
I've also driven my 2,000 Ohm headphones straight off of pre-amp outputs, the results were excellent, I've never heard them sound better........OK, they sounded just as good out of a power amp.wink.gif
post #1071 of 2665
Quote:
Originally Posted by Gary in MD View Post
 

As an aside, I think I've now p'd off everybody on the "Amp recommendations for LCD-3" thread by recommending the Cyclops and MIllenia.  I'm getting all of the usual responses:  "You'll blow up your headphones" and "You'll hear too much noise" and "my sister's boyfriend's cousin tried a speaker amp on his cans and his head exploded."   Or similar authoritative statements..

 

I think I've got a few guys at least thinking about it, but the MJ and Soloist, not to mention the GS-X Mk II, have such fierce defenders that you don't dare criticize them.  I wonder how long it will be before I get banned from their thread...

 

That's funny, Gary!  Some people just don't want to hear truth....  Sad....

 

I'd join you over in that LCD-3 thread if I'd ever heard LCD-3's!  

 

Hey, brunk... Just put together an order for a Lightspeed....  I'm going with the non-uP, "match up the LDR's" version.  Should be fun!


Edited by potterma - 9/22/13 at 9:03pm
post #1072 of 2665
Quote:
Originally Posted by preproman View Post
 

 

There are Pros and Cons to both:  For my amp.  The F1J a current stage amp with very little gain I need a active preamp.  Passives don't have a gain stage.  So they depend upon voltage from the source (DAC or CD player) and the gain in your amp to drive the signal.  If your source has low voltage and your amp has low or no gain.  Then a passive pre won't do you any good.  

 
Depends on your amp really.

 

Interesting.  I'm currently driving my F1 (not J... yet) with a DIY version of the B1.  Running out of room on the volume pot is not an issue.  I'm pretty sure the B1 is set up for unity gain at max output, but I haven't verified that.  Guess I should do some measurements and find out for sure.

 

update: Yes, the B1 is running unity gain at max output.  I running Gungnir in SE for a DAC, so I've got 2 VRMS or less into the B1.  

 

Preproman are you using a low output voltage DAC?


Edited by potterma - 9/22/13 at 8:50pm
post #1073 of 2665
Quote:
Originally Posted by Chris J View Post


Yes!
I have heard this theory before!
I wonder what the technical rationale is for this?
Even if it is true, it is probably only true for mechanically flimsy pots.
No offence to anyone, but to me it smells of more audio hokum and mumbo-jumbo.

To that list I'll also add the "diode rectification" theory. We've also heard this "theory" thrown around to justify this cable over that cable. rolleyes.gif

OTOH, I'm not really trying to bash the Lightspeed Attentuator!
Hey man, I'm not even trying to dump on cables either.
Just the marketing hokum!

 

Chris... George of Lightspeed Attenuator fame made measurements with some high speed equipment on various pots and switches.  He reported that he was able to see the effect with very fast square waves (very sharp leading edges) on a very fast storage 'scope.  He reported that applying pressure to the wiper nullified the effect.  I'm not privy to any of the details, just repeating what I read in the thread over on DIYAudio.

 
Hokum?  I don't know.  I'm sure tired of marketing hyperbole.  Hope to have the parts in had and do my own listening test in the next week or three...
post #1074 of 2665
Quote:
Originally Posted by potterma View Post
 

 

Chris... George of Lightspeed Attenuator fame made measurements with some high speed equipment on various pots and switches.  He reported that he was able to see the effect with very fast square waves (very sharp leading edges) on a very fast storage 'scope.  He reported that applying pressure to the wiper nullified the effect.  I'm not privy to any of the details, just repeating what I read in the thread over on DIYAudio.

 
Hokum?  I don't know.  I'm sure tired of marketing hyperbole.  Hope to have the parts in had and do my own listening test in the next week or three...

 

You're building a LDR pre too? What parts did you go with?

post #1075 of 2665
Went with the 2s parts from Allied. Bought 20 so I hope to get reasonable matched pairs.
post #1076 of 2665
Quote:
Originally Posted by potterma View Post

Went with the 2s parts from Allied. Bought 20 so I hope to get reasonable matched pairs.

 

That sounds like it's right on the edge of getting a decent matched set. The major problem is that it's not like a standard fixed resistor, the values are highly non-linear as you attenuate the signal. Good luck!

post #1077 of 2665

Ouch, I just picked up my soldering iron at the wrong end.   Scratch that idea...   The smoke was burning my eyes and nostrils, anyway.

 

I guess I'll have to just keep buying ready-for-use gear.

 

:-)

post #1078 of 2665
Quote:
Originally Posted by zilch0md View Post
 

Ouch, I just picked up my soldering iron at the wrong end.   Scratch that idea...   The smoke was burning my eyes and nostrils, anyway.

 

I guess I'll have to just keep buying ready-for-use gear.

 

:-)

 

Ouch! Hope your hand isn't too bad off. Let me know if you want a ready-to-go DIY build and I'll be more than happy to help a brotha out :beerchug: 

 

EDIT: On a lighter note, my matched NOS FETs for the First Watt F5 have arrived 2 weeks earlier than expected! :D


Edited by brunk - 9/23/13 at 1:58pm
post #1079 of 2665
Quote:
Originally Posted by brunk View Post
 

 

That sounds like it's right on the edge of getting a decent matched set. The major problem is that it's not like a standard fixed resistor, the values are highly non-linear as you attenuate the signal. Good luck!

 

Yes, hopefully with this small set of pre-matched LDR's I'll find some good pairs.  It will at least be enough to throw some parts together and try it out.  If necessary, I'll tweak them in near a prefered listening level and deal with the tracking issue with a larger batch of parts.

 
Good news on your NOS FETs!  
post #1080 of 2665
Quote:
Originally Posted by potterma View Post
 

 

Yes, hopefully with this small set of pre-matched LDR's I'll find some good pairs.  It will at least be enough to throw some parts together and try it out.  If necessary, I'll tweak them in near a prefered listening level and deal with the tracking issue with a larger batch of parts.

 
Good news on your NOS FETs!  

 

Yeah I hope it turns out well for you. Yes, I'm very happy they arrived in perfect condition and are indeed genuine! 

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