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Speaker amps for headphones - Page 84

post #1246 of 3116
Found a working copy here.

http://home.mira.net/~marcop/ciocahalf.htm

se
post #1247 of 3116
Quote:
Originally Posted by Steve Eddy View Post


Works for me. Though my iPad isn't displaying the GIF images. Hmmm, neither is my laptop. But all the text is still there.

se

 

To be precise, yes the images will not download.

Edit.

Nevermind.

The other link shows GIFs.

 

I need an 800 Ohm interconnect, no I need a 5 kOhm interconnect, no I need a.......nevermind.


Edited by Chris J - 10/31/13 at 9:49am
post #1248 of 3116
Quote:
Originally Posted by Chris J View Post
 

I need an 800 Ohm interconnect, no I need a 5 kOhm interconnect, no I need a.......nevermind.

 

:D

 

se

post #1249 of 3116

^ lol

 

thanks for the great info guys :) learning something new everyday!

post #1250 of 3116
 
Originally Posted by vincent215 View Post
 

I am curious if there are any great sounding speaker amps with the Sen HD800?

Originally Posted by brunk View Post
 

I could be mistaken, but I believe Flysweep has experience in this area.

 

Yup!  I've run the HD800 & HD600 off the TBI Millenia (w/ resistor box).. it sounded terrific.  Extremely spacious, terrific bandwidth, and the presentation was effortless.

post #1251 of 3116
Quote:
Originally Posted by FlySweep View Post
 

 

Yup!  I've run the HD800 & HD600 off the TBI Millenia (w/ resistor box).. it sounded terrific.  Extremely spacious, terrific bandwidth, and the presentation was effortless.

...and just to clarify, you had hiss without using the impedance box, correct? Does the box bring it down to an 8ohm load or what?

post #1252 of 3116
 
Originally Posted by brunk View Post
 

...and just to clarify, you had hiss without using the impedance box, correct? Does the box bring it down to an 8ohm load or what?

 

I never attempted to hook the HD600/HD800 directly to the Millenia's speaker taps.  I did with the HE-500 (and got a lot of hiss & little to no play on the vol. pot before it got loud).  With the resistor box, the HD600, HD800, and HE-500 were dead silent, and I have until 12-1 o'clock on the pot... so a resistor box is a must w/ the Millenia, IMO... and yes, the resistor box brings it down to an 8 ohm load.

post #1253 of 3116
Quote:
Originally Posted by FlySweep View Post
 

 

I never attempted to hook the HD600/HD800 directly to the Millenia's speaker taps.  I did with the HE-500 (and got a lot of hiss & little to no play on the vol. pot before it got loud).  With the resistor box, the HD600, HD800, and HE-500 were dead silent, and I have until 12-1 o'clock on the pot... so a resistor box is a must w/ the Millenia, IMO... and yes, the resistor box brings it down to an 8 ohm load.

ok, thanks flysweep!

post #1254 of 3116
Quote:
Originally Posted by brunk View Post
 

^ lol

 

thanks for the great info guys :) learning something new everyday!

 

NP

 

This is why the words "impedance matching" when used in ANALOG audio circuit discussions drive me squirrrelly!  :wink_face: 

post #1255 of 3116
Quote:
Originally Posted by Chris J View Post
 

 

NP

 

This is why the words "impedance matching" when used in ANALOG audio circuit discussions drive me squirrrelly!  :wink_face: 

post #1256 of 3116
Quote:
Originally Posted by brunk View Post



A scene from Star Wars VII ?
post #1257 of 3116
Quoting myself...
Originally Posted by zilch0md View Post
 

:blink:

 

Will the expert who actually knows what he's talking about please stand up?  

 

 

@Steve Eddy - Thanks for "standing up" Steve!  

 

It seems the consensus here, especially with your contributions, is that for cables carrying analog audio signals at least, we can forget about "reflections" that lead to either phase shifting or frequency changes.  We need only concern ourselves with keeping resistance low, by using heavy guage wire with short runs.  

 

I hope this is true, as stated.  :o

 

Quote:
Originally Posted by brunk View Post
 

I could be mistaken, but I believe Flysweep has experience in this area.

 

@zilch0md - I noticed in the Deals thread you jumped on some HD600s. What are your plans for those babies? You know you want to jump on the BH Crack bandwagon...:evil:

 

@brunk - I was just looking at the Bottlehead site a couple of days ago!  You're encouragement is always welcome, of course.  :D  

 

$279 is so tempting and it does look to be a fairly simple build, but I'm trying to get away from tubes!  :rolleyes:

 

Meanwhile, FlySweep's intoxicating descriptions of his MG3 > HD600 rig have pushed me over the edge on finally getting them.  :o  

 

I've put off buying a pair of HD600's for a couple of years now, but the synergy FlySweep is experiencing with the MG3 broke this camel's back.  They should be here in a couple of days.  :tongue_smile:

 

I've already ordered an HD 600 replacement cable (directly from Sennheiser) that I'm going to terminate with banana plugs and use with my current MG3 "magic box."  

 

Jan Plummer told me a while back that these boxes he's been creating are tuned for the sensitivity of a given headphone more than for the headphone's impedance, so I'm just going to try the the 300-Ohm HD600 with the "magic box" he designed for my 50-Ohm LCD-2.   Stay tuned...

 

Quote:
Originally Posted by Steve Eddy View Post

[snip]
Too lazy to do the math right now, but if memory serves, the electromagnetic wavelength at 20kHz is around nine mile long. Kind of hard to build up anything that resembles a reflection in a cable that may only be a few feet long.

se

 

Yeah!  Thanks for the confirmation!

 

Quote:
Originally Posted by Steve Eddy View Post

Found a working copy here.

http://home.mira.net/~marcop/ciocahalf.htm

se

 

I read all of it and understood about 3/4 of it.  Thanks!  

 

Quote:
Originally Posted by Chris J View Post
 

[snip]

 

This is why the words "impedance matching" when used in ANALOG audio circuit discussions drive me squirrrelly!  :wink_face: 

 

Heard that!

 

Mike

post #1258 of 3116
Quote:
Originally Posted by FlySweep View Post
 

 

... snip ...... so a resistor box is a must w/ the Millenia, IMO... and yes, the resistor box brings it down to an 8 ohm load.

 

While the resistor box allows the amp to see the load as about 8 ohms (not that a solid state amp cares in most cases), that is NOT why the hiss goes away.  The hiss goes away because of the voltage divider inside the box...  Dividing down the output signal by enough to compensate for the high gain in the amplifier.

 

@zilch0md :  Its not JUST the resistance of the cable that is important.  Also inductance and capacitance.  Some high dollar cables offer low resistance, but high capacitance or inductance in some cases causing certain amplifiers to oscillate.  Some say this amplifier oscillation is the fault of the amplifier designer, and that may be so, but it does indicate that inductance and capacitance can be important parts of the cable impedance equation, even at audio frequencies.  There don't have to be reflections to cause phase errors.

 

@Steve Eddy  :  Thanks for the link to the Belden paper!  Oh, and 20 kHz in copper is ~8.9 miles long :)  I always knew the wavelength of an audio signal was long, but never bothered to figure out how long.  When I worked on pulse controlled lasers, all our coax cable was specified in ns not feet...  "a foot per nanosecond" was always our rule of thumb.


Edited by potterma - 10/31/13 at 9:07pm
post #1259 of 3116

Why are you trying to get away from tubes Zilch? Do you have them coming out of your ears or something? :tongue_smile: Nice to see you join the Senn club, have you heard the HD-800 yet? :evil:

 

Good points Potterma, there's always more than one attribute with something. I enjoyed that Belden paper too and its now part of my mountain of bookmarks that i really should start organizing lol.

post #1260 of 3116
Quote:
Originally Posted by FlySweep View Post
 

 

Yup!  I've run the HD800 & HD600 off the TBI Millenia (w/ resistor box).. it sounded terrific.  Extremely spacious, terrific bandwidth, and the presentation was effortless.

Thanks FLySweep.

How about the bass/treble on HD800? Does bass hit low, and have more quantity than other amps? Does treble get hot?

Are you using Hifiman resitor box?

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