Speaker amps for headphones

[ALRAINBOW]

Ok thanks. I use a 10 ohm and 2 ohm in series with the headphone in parrlel with the 2 ohm.
It works fine and dead silent.

 

[robrob]

 As Al suggests, you probably need more attenuation for the HD 800's.  You probably want a separate box for the HD 800 since enough attenuation for the  HD 800 will likely result in too much attenuation for the HE-6.

 
This is why I added the 'network bypass switch' to the Robinette Box. You can switch out the resistor network when driving low sensitivity headphones like the HE-6.
 

 Ok thanks. I use a 10 ohm and 2 ohm in series with the headphone in parrlel with the 2 ohm.
It works fine and dead silent.

12 ohms for R2 and 2 ohms for R3 gives you 16dB of attenuation. What amp and headphones are you using again?

 

[robrob]

On a somewhat related note I have recently put up a web page explaining how the simple Fender 5F1 Champ guitar tube amplifier works. Much of it will apply to speaker and headphone amplifiers so you may find it interesting. Of course, if you find an error please let me know.
 
How Guitar Tube Amplifiers Work
 

 

 

[ALRAINBOW]

Wow looks cool. I'm lazy I just have two resisters with a tap in the middle . I use female banana on the tap and mail taps on the others. It's connected to a 4 pin XlR female.

 

[Chris J]

  Hello,
 
I experienced noise with my HD800 and my Threshold and MCIntosh. I use the HE adapter. I don't have noise with HE60, K1000 and HE6. 
It seems a bad impedance ? What shoud I buy ?

 
Well, since you asked......................
.......a really high quality headphone amplifier, like a Bryston, for example.

 

[Chris J]

  Chris, correct me if I'm wrong, but your flat braided speaker cable wasn't a coax, right?

 
 

Rob before my comment gets misconstrued , what I meant was a coax like cable. Meaning as with coax the center conductor is surrounded by the gnd , usually in a mesh. As such the flat braided cable he was refereeing to is similar in design , not being like most speaker cables as in two wires twisted or next to each other. This design can yield a higher than normal speaker wire capacitance , as such affect the output Of the amp. Hope this helps .

Cris j. thanks for the reply.

Al. D

 
 

  Well, 12 foot is not very long. It seems that with the capacitance of the cable in addition to the capacitance of the passive crossover was too much for the amp to handle.  Makes me wonder if that amp is more prone to some ringing on music transits as well.  I have always used large gauge plain clear jacket speaker wire to the passive speakers.

 
 
OK folks,
I dug the mystery cable out of the basement.
 
It is definitely NOT a Coaxial constriction.
It appears to be very fine Litz wire wound together into a flat braid.
It is NOT similar to Nordost's flat cable construction.
And it looks quite different than Kimber's braided weave loudspeaker cables.
 
This cable is over 30 years old, so the writing on the cable is somewhat faded.
Brand name is hard to read "OTK"? Made in Japan.
There is a marking that appears to read "SHF SP Cord".
Apparently in the USA it was marketed as "Polk Cobra".
Total capacitance is 12 nF (or 12,000 pF) per run.  Cable is approx. 16 feet long.
 
Compare this to a typical Nordost Loudspeaker cable: 120 pF for a 10 ft length
 
Chris

 

[john57]

   
 
 
 
 
 
OK folks,
I dug the mystery cable out of the basement.
 
It is definitely NOT a Coaxial constriction.
It appears to be very fine Litz wire wound together into a flat braid.
It is NOT similar to Nordost's flat cable construction.
And it looks quite different than Kimber's braided weave loudspeaker cables.
 
This cable is over 30 years old, so the writing on the cable is somewhat faded.
Brand name is hard to read "OTK"? Made in Japan.
There is a marking that appears to read "SHF SP Cord".
Apparently in the USA it was marketed as "Polk Cobra".
Total capacitance is 12 nF (or 12,000 pF) per run.  Cable is approx. 16 feet long.
 
Compare this to a typical Nordost Loudspeaker cable: 120 pF for a 10 ft length
 
Chris

The OTK is just a quality control stamp. Mostly I find that on  my Russian vacuum tubes.
Here is some users comments on the Polk Cobra cables
 
http://www.polkaudio.com/forums/showthread.php?146660-Polk-Cobra-Speaker-Cables
 
http://www.polkaudio.com/forums/showthread.php?49631-Polk-Audio-speaker-cable-Cobra

 

[ALRAINBOW]

To all a very merry Christmas. I'm hanging with JOHHNY BLUE .


And let's all hope in the new year I can learn to spell better and get better linguistic skills as well. All the best to all weather you like me or not as like you all anyway. LOL

AL D

 

[potterma]

To all a very merry Christmas. I'm hanging with JOHHNY BLUE .

Spoiler: pic

And let's all hope in the new year I can learn to spell better and get better linguistic skills as well. All the best to all weather you like me or not as like you all anyway. LOL

AL D

Mmmmm Tasty!  Merry Christmas Al, and all the other crazy Head-Fi'ers that frequent this crazy thread!  
 
Have a safe and fun Holiday with family and friends!

 

[ALRAINBOW]

Thanks

Al. D

 

[ALRAINBOW]

Check it out .

Al d

 

[zilch0md]

You're not making any progress there, Al!



Merry Christmas!

Mike

 

[ALRAINBOW]

Thanks , it's going slow eh.

Al

 

[robrob]

To all a very merry Christmas. I'm hanging with JOHHNY BLUE .


And let's all hope in the new year I can learn to spell better and get better linguistic skills as well. All the best to all weather you like me or not as like you all anyway. LOL

AL D

Merry Christmas Al. Your english is much better than my (insert any other language).

 

[ALRAINBOW]

All the best . Lmao