Crossfeed for HD600

[merlin el mago]

I'm looking for a crossfeed schematic for my HD600, I want a more centered image of the sound so less stereo effect.

TIA
Felipe

 

[merlin el mago]

Looking at the webb I got several schematics:

Headphone xfeed

https://ka724ka.wordpress.com/tag/xfeed/

 

[Bibio]

i have been looking for something like this but i never knew what they were called. i also find headphone listening artificially wide. the sound should be in your head not in your ears/headphones.

thank you for this

 

[merlin el mago]

Nobody?

 

[mlloyd1]

i guess you found the best two circuits.



mlloyd1

 

[EUVL]

With the impedance curve vs. frequency of the HD600 anything but flat :
http://www.innerfidelity.com/images/SennheiserHD600.pdf
You are not going to get a decent response with a passive cross feed network, unless you use a notch to flatten it first at 100Hz.
And then a Zobel to pull down the inductance from 5kHz onwards.

For a collection of different cross feed network, you can refer to the references (2~6) here :
http://xen-audio.com/documents/f5ha/F5-HA Description V1.4.pdf


Patrick

 

[merlin el mago]

Thanks for the links Patrick very helpfull, I'm still not sure what way to choose for EQ: passive or digital, I like the sound at 100Hz, I can't calculate the zobel because I don't know the voice coil inductance Le.

With the xfeed I'm looking for a more centered sound but the schematics used don't like the sound. What do you think is the best for HD600?

Congrats for you very nice headphone amp

 

[merlin el mago]

Can be Le 46.155 mH?

 

[agdr]

I looked at building a crossfeed add-on board for one of my amp designs a year or two ago. Looking into it through there were several software crossfeed plug-ins for popular audio players that seemed to be highly rated, so I never bothered. At least one of those was for-pay commercial software too, as I recall, and rather pricey.

Software doesn't help much though if the source is a turntable or or non-PC gizmo!

Dr Meier did that original post on Headwize way back when (the excerpts in your second link in post #2). Since then it looks like he formed Meier audio, a commerical company, if I have the history right. Here is his crossfeed page:

Meier Audio

EUVL has a good point. Crossfeed may be best done on the source end of things (that is where I was going to put it) so a low Z output headphone amp can drive the headphones directly.

 

[EUVL]

We shall never use a passive cross over even with a flat impedance like the HE1000.
Compare to burning off 90% of the output power of the headphone amp in the passive filter, an active filter at the input is a much better solution.


Patrick

 

[merlin el mago]

Sorry my ignorance: is possible to make an active zobel filter?

 

[merlin el mago]

Started with this attached schematic.

I'm hearing better the headphones, the sound is more centered allowing to listen now more details before not listened for the stereo image.

I guess the schematic used is for medium crossfeed, time to experiment with more crossfed schematics.

 

[merlin el mago]

Corda CROSS-1

 

[merlin el mago]

Audioheaven crossfeed

 

[merlin el mago]

Corda CROSS-1

Formulae etc if you want to tweak.

Meier-Audio