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Speaker amps for headphones - Page 137

post #2041 of 3116
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.
post #2042 of 3116
Quote:
 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.

 

Quote:
 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?


Edited by robrob - 12/24/13 at 10:31am
post #2043 of 3116

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

 

Triode_5F1_Layout_Annotated.jpg 

post #2044 of 3116
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.
post #2045 of 3116
Quote:
Originally Posted by Hun7er View Post
 

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.:wink_face:

post #2046 of 3116
Quote:
Originally Posted by robrob View Post
 

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

 

 

Quote:
Originally Posted by ALRAINBOW View Post

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

 

 

Quote:
Originally Posted by john57 View Post
 

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


Edited by Chris J - 12/24/13 at 2:55pm
post #2047 of 3116
Quote:
Originally Posted by Chris J View Post
 

 

 

 

 

 

 

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

post #2048 of 3116
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
post #2049 of 3116
Quote:
Originally Posted by ALRAINBOW View Post

To all a very merry Christmas. I'm hanging with JOHHNY BLUE . pic (Click to show)



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!

post #2050 of 3116
Thanks

Al. D
post #2051 of 3116



Check it out .

Al d
post #2052 of 3116
You're not making any progress there, Al!

:-)

Merry Christmas!

Mike
post #2053 of 3116
Thanks , it's going slow eh.

Al
post #2054 of 3116
Quote:
Originally Posted by ALRAINBOW View Post

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).

post #2055 of 3116
All the best . Lmao
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