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NEW Vali Schiit AMP!!! - Page 193

post #2881 of 4232

No problem! The HE-400's are supposed to be awesome!! Enjoy!

post #2882 of 4232
Quote:
Originally Posted by cakebreaker View Post
 

Very basic stuff. I'm more interested in specs specifically what chip(s) it uses to amp the headphone output.

Onkyo TX 8511 headphone output is the speaker output via 390 Ohm series resistor. (will give a little boost in the bass for DT 880/250)


Edited by jimmers - 1/12/14 at 7:46pm
post #2883 of 4232
Quote:
Originally Posted by jimmers View Post
 

Onkyo TX 8511 headphone output is the speaker output via 390 Ohm series resistor. (will give a little boost in the bass for DT 880/250)

Thanks. That is definitely the case. I also found out that it uses NJM2068 opamp.

post #2884 of 4232
Quote:
Originally Posted by cakebreaker View Post
 

Well, I just ordered HiFiMAN HE-400 :dt880smile: So, more tests to come...

Thanks for sharing man!

Be careful about using a receiver. One thing is that they usually do not have a separate amp for the headphone jack but instead have resistors in series between the amp itself and the headphone jack. So one asks, why and is there a downside.

Most headphones cannot handle the enormous power levels that can come out of receivers/speaker amps. So to protect the headphones and not increase the cost of the product by incorporating a proper headphone amp, resistors are used to limit the power. The downside is that dynamic cans do not have a flat impedance curve. So a can that has an impedance peak in the bass will have a bass boost that one might think sounds good, but experienced ears will hear a less controlled bass due to the loss of damping resulting from that resistor. If you put those cans directly on the speaker taps and turn up the volume, you risk hurting your ears and smoking you cans. Orthodynamic cans like the HE-400's that you are getting tend to be resistive and have no such impedance curves and should not have issues with FR peaks or damping. Orthos tend to be less sensitive so many people will put them directly onto the speaker taps of a lower power amp like an Emotiva Mini. A Can like an HE-6 can take a lot of power, much more than the HE-400. I'd be very careful of putting any cans directly on the speaker taps of something that can deliver as much power as the Onkyo. You would have to learn about figuring out the proper L-PAD or T-PAD as appropriate to use with the exact combination of Amp and Cans. I have a pair of HE-500's hanging of my Vali and it works well, although not earsplitting loud, I believe your HE-400's will be more sensitive, hence louder.

 

Edit: I see more info was added to this thread as I was typing up this post.

 

Edit more: I just looked up the impedance curve for those cans and they are not too extreme. Still a simple series resistor is not the best approach and the value in the amp may not provide enough attenuation for a 250 Ohm can, so be careful with that volume knob. YMMV.

http://www.innerfidelity.com/images/BeyerdynamicDT880250ohm.pdf


Edited by StanD - 1/12/14 at 8:33pm
post #2885 of 4232
Quote:
Originally Posted by StanD View Post
 

Be careful about using a receiver. One thing is that they usually do not have a separate amp for the headphone jack but instead have resistors in series between the amp itself and the headphone jack. So one asks, why and is there a downside.

Most headphones cannot handle the enormous power levels that can come out of receivers/speaker amps. So to protect the headphones and not increase the cost of the product by incorporating a proper headphone amp, resistors are used to limit the power. The downside is that dynamic cans do not have a flat impedance curve. So a can that has an impedance peak in the bass will have a bass boost that one might think sounds good, but experienced ears will hear a less controlled bass due to the loss of damping resulting from that resistor. If you put those cans directly on the speaker taps and turn up the volume, you risk hurting your ears and smoking you cans. Orthodynamic cans like the HE-400's that you are getting tend to be resistive and have no such impedance curves and should not have issues with FR peaks or damping. Orthos tend to be less sensitive so many people will put them directly onto the speaker taps of a lower power amp like an Emotiva Mini. A Can like an HE-6 can take a lot of power, much more than the HE-400. I'd be very careful of putting any cans directly on the speaker taps of something that can deliver as much power as the Onkyo. You would have to learn about figuring out the proper L-PAD or T-PAD as appropriate to use with the exact combination of Amp and Cans. I have a pair of HE-500's hanging of my Vali and it works well, although not earsplitting loud, I believe your HE-400's will be more sensitive, hence louder.

Edit: I see more info was added to this thread as I was typing up this post.

Good post. Very helpful. Sounds like I'm going to need to stick with Vali after all that hype of mine ;)

post #2886 of 4232
Quote:
Originally Posted by cakebreaker View Post
 

Good post. Very helpful. Sounds like I'm going to need to stick with Vali after all that hype of mine ;)

One just needs to know what they're getting into as not to hurt ears or cans. Heck, you just bought an amp dedicated to driving cans. With the right information and twiddling it is possible to use a receiver with cans, but as we know you just bought a nice solution with the Vali. It's time for me to get a listening in :happy_face1: before it's time to turn in.

post #2887 of 4232

Anyone here experience a case where the vali started to ring w/o touching it? I have to unplug and re-plug in the headphone to get it to go away.

post #2888 of 4232
Quote:
Originally Posted by KMSV View Post
 

Anyone here experience a case where the vali started to ring w/o touching it? I have to unplug and re-plug in the headphone to get it to go away.

Yes, its very normal I think for the Vali to ring without touching it. For example: Put your headphones on whilst connected to the Vali and place your head near the amp. Talk from a normal tone all the way to yelling towards the amp. It will start ringing depending on how loud your voice is. This is micro-phonics from the tubes, completely normal.

post #2889 of 4232

Really.. I have to do couple tests, maybe open it up to check if the tube is down and push it down.  Hopefully that would reduce the ringing.  If not I may have to send it back to Schiit, look like the newer releases have much less ringing according to the recent posts.  The price you pay for being early adopter :).

post #2890 of 4232

Hi Guys,

According to micro-phonics issue you can do a simple mod.

Take some silicone tubing (like the ones used in medical stuff), cut the tubing in sizes of the vali tubes then cut them in length, so you can wrap them around the tubes.

Voila, no more ringing :)

 

 

 

 

 

post #2891 of 4232
The tubes will always be microphonic and will always ring regardless what you do to them LOL Some tubes ring more than others, just the way it is.
post #2892 of 4232
I emailed Schiit to see if they'd do a microphonics dampening kit. Curious to see their response.
post #2893 of 4232
Quote:
Originally Posted by phillyd View Post

I emailed Schiit to see if they'd do a microphonics dampening kit. Curious to see their response.

Don't hold your breath.
post #2894 of 4232
Quote:
Originally Posted by kiromn View Post
 

Hi Guys,

According to micro-phonics issue you can do a simple mod.

Take some silicone tubing (like the ones used in medical stuff), cut the tubing in sizes of the vali tubes then cut them in length, so you can wrap them around the tubes.

Voila, no more ringing :)

 

 

 

 

 

 

Going on my experience using Blu-Tack....

 

 

... I like your idea of using silicon tubing, as it's a much cleaner way to add some mass to the tubes that might dampen the movement of the glass.

 

But... My Blu-Tack has only reduced the duration of ringing for any given stimulus - significantly - but it has not eliminated the ringing.

 

Problem:  The elements inside the glass tubes can still vibrate, no matter what you do to dampen the movement of the glass.

post #2895 of 4232

Maybe in future versions schiit can add something around the tubes that will keep them from moving, instead of users doing that them self. Maybe like a plastic clip that re-moveable that keeps the tube from moving during use. Unless they change the whole tube layout to the tubes that stand straight up.  I do have interested in the vali but not if I have to manually find a way to make the ringer stop.

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