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Speaker amps for headphones - Page 133

post #1981 of 2717
Quote:
Originally Posted by ALRAINBOW View Post

What is there to be confused about . I followed what was given , it's not the volume I care about it's why was the resister overloaded. It's a ten watt resister. The way the circuit is destined the power for the headphone and the total power goes through that resister but regardless how odd I achieve excess of 10 watts . Now that the headphone is out of the circuit it's fine ice cold . So the headphones were using some serious power .

Just because the resistor got hot doesn't mean it was dissipating more than 10W.  Cement wire wound resistors get quite warm at rated load.. burn your finger warm... That's how they are designed.

post #1982 of 2717
Quote:
Originally Posted by potterma View Post
 

Just because the resistor got hot doesn't mean it was dissipating more than 10W.  Cement wire wound resistors get quite warm at rated load.. burn your finger warm... That's how they are designed.


I run a similar setup (same amp too) and my resistors always stay nice and cool. I used 100ohm and 3 ohm.

post #1983 of 2717
Well I know they can get warm or very warm to the touch but it's a new amp and 1500 headphones so I'm not happy.

And ohh , sis not hot and I am. Guessing it's because he is at 100 ohms and I am at 10 ohms . My point is this happened in about 15 mins and I would not go any longer.. I will measure the voltage if I can in the morning. Playing some kind of steady sound . But I am thinking that the total load across the resister and the added load of the headphone is exceeding or getting close to the max of the resister . AnywAy it's fine now.
post #1984 of 2717
Quote:
Originally Posted by ohhgourami View Post
 


I run a similar setup (same amp too) and my resistors always stay nice and cool. I used 100ohm and 3 ohm.

Wow, that's a lot of attenuation.  Do you really need that much attenuation with the Krell?

post #1985 of 2717
Quote:
Originally Posted by potterma View Post

Wow, that's a lot of attenuation.  Do you really need that much attenuation with the Krell?
With +36dB gain, I sure do. I listen at ~32/151 volume with resistors.

Without resistor's I have to listen at 2/151.
post #1986 of 2717

In reply to those 10w wirewound resistors getting hot. Those things will literally glow orange in the dark, and start to yellow/blacken when being overloaded. They will melt the skin right off your finger. They can take a real beating, so if you're touching them and not cussing at yourself from a burn, you're fine :tongue:

 

Yes, I like to watch things blow up :devil_face:

post #1987 of 2717
Quote:
Originally Posted by ohhgourami View Post


With +36dB gain, I sure do. I listen at ~32/151 volume with resistors.

Without resistor's I have to listen at 2/151.

 

OK, good to know!  That is a lot of gain.  I seem to remember now that the input sensitivity was very low (meaning high gain) on that amp, but didn't realize it would require that much attenuation.  Was the gain accompanied by a high noise floor, or is it just volume knob adjustment you were after?

 

Quote:
Originally Posted by brunk View Post
 

In reply to those 10w wirewound resistors getting hot. Those things will literally glow orange in the dark, and start to yellow/blacken when being overloaded. They will melt the skin right off your finger. They can take a real beating, so if you're touching them and not cussing at yourself from a burn, you're fine :tongue:

 

Yes, I like to watch things blow up :devil_face:

Keep flammable objects away!  

post #1988 of 2717
Quote:
Originally Posted by potterma View Post

 

Keep flammable objects away!  

But that's no fun :veryevil: 

 

EDIT: Seriously though, I do these things in a controlled environment with an extinguisher handy.

post #1989 of 2717
Quote:
Originally Posted by brunk View Post
 

But that's no fun :veryevil: 

 

EDIT: Seriously though, I do these things in a controlled environment with an extinguisher handy.

OK, good.  I was thinking of the window drapes!  Controlled destruction is fun :)

post #1990 of 2717
Quote:
Originally Posted by potterma View Post
 

OK, good.  I was thinking of the window drapes!  Controlled destruction is fun :)

Hehe it sure is! Depending upon the potential, I will do it outside, or in the bath tub with a basin of sand lol :tongue:

post #1991 of 2717
Quote:
Originally Posted by potterma View Post
 

 

OK, good to know!  That is a lot of gain.  I seem to remember now that the input sensitivity was very low (meaning high gain) on that amp, but didn't realize it would require that much attenuation.  Was the gain accompanied by a high noise floor, or is it just volume knob adjustment you were after?

Both. Very happy with the resistor setup. The HE-6 is only receiving 0.17Wpc compared to ~30Wpc. There has been no change in sound quality after carefully ABing for an hour.

post #1992 of 2717

Yesterday I compared the Millenia with and without the resistor box. Directly from the speaker tap the sound is more dynamic and open. Now either the resistances I used are bad quality ones or attenuating the sound just kills the dynamics. I read that adding a bleeder cap may help with this. 

I do get a hum without the resistor box but it's not too bad, I think 6db attenuation would be enough to remove the hiss, 12db is overkill. 

I will try all kinds of setups I can think of over the weekend and I will use alligator clips to add remove resistances with ease.

 

If there is a will there is a way.

post #1993 of 2717
I can say that for me removal of the attenuation had no effect on the sound. I am sure it has become louder but the krell kav 400xi. Is dead silent with just the 10 ohm across the speaker terminals .
Over today and the weekend I plan to do some better testing , and compare to some other amps as well. But for now bliss and thanks for all the work yup people have put into this..
post #1994 of 2717
Quote:
Originally Posted by ALRAINBOW View Post

First of not all wire wound resisters are the same. As the ones with more space between them will have no inductance.
As for lands yes not intended for us. And they are a transformer as i said . The purpose of it is to keep the same load on the amp and allow for controlling the volume they are rated as well about 80 watts for a good one . And you can smoke them too . Lol I have. As I amusing the resister network you people were so kind to design , I have an issue.

I have an amp solid state rated at about 100 watts at 8 ohms . And using the HE6 headphones .

So I have a 8 ohm and 2 ohm in series with tap in the middle of them. As shown in this thread . Well the attenuation was fine but the 8 got hot , too hot. They are 10 wire wound in ceramic . So after this I just left the two resisters connected to the speaker terminal and connected the headphones directly to the speakers terminals so they all are in parallel .

The sound level seems to be the same and all is well . So does someone here know what I did that was wrong ?

All resistors have inductance.
You can't get rid of it.
Even a piece of wire has inductance.
I assume you meant Low Inductance?

But In practice, if it's small enough, you can ignore it, especially at audio frequencies.

BTW, I've seen very hot ceramic resistors in the field. As a few posters have pointed out, some types do run extremely hot at full power, so may seem pretty damn hot at say 25% of their power rating.
post #1995 of 2717
Yes I did sorry . It's just low enough to be ignored. So far very happy with the amp right now. I have two more to try out , when I can. But I do not expect to get anything more out of ot , maybe less. After what I heard yesterday I think my stax rig can in some ways do it better. I see you are up late .
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