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NEW Vali Schiit AMP!!! - Page 229

post #3421 of 4373
Quote:
Originally Posted by Spiral Out View Post
 

I have been thinking about trying an impdance adapter out with the 225. The only reason I haven't yet is that I can't find one that's 1/4" to 1/4". I really would rather not have an 1/4" to 1/8" adapter, then a impedance adapter on top of that. That might be kind of silly I know :o StanD's recommendation of an LPAD sounds like a better solution, but I have not been able to find one any were on the net that is suitable for use with headphones.

It takes only two resistors per channel to make an L-PAD that will attenuate the signal and keep a low enough impedance to damp the headphones. Four resistors, two jacks, a box and some wire and you can make one. Or else you have to find someone nearby that can solder.

I figured out the resistors for someone a few days ago. If you match the resistors on a meter you can prevent any imbalance in the channels.This was for a specific set of headphones.

http://www.head-fi.org/t/685162/new-vali-schiit-amp/3390#post_102511

 

At what position do you have the volume knob when you listen with the SR225i's?

post #3422 of 4373

Listening to the Vali right now fed by a Dragonfly into a new pair of Grado RS1i's.  No/minimal noise floor to speak of even when I pause the music. The trick for me is not to touch it once I get setup and tweak the volume via the Dragonfly.  I'm really enjoying it.  What an inexpensive and sublime combo for under $300.

post #3423 of 4373

Normally I don't go past 10 o'clock on the volume knob with the 225's.I just looked at your post regarding building an L-Pad, it seems to be simple enough to build. Thank you for the instructions. Any suggestion were I could find the resistors and the jack to build it? RadioShack? Too bad I don't have the parts now, tomorrow would be a good time to build it as I will be most likely snowed in.

post #3424 of 4373
Quote:
Originally Posted by Spiral Out View Post
 

Normally I don't go past 10 o'clock on the volume knob with the 225's.I just looked at your post regarding building an L-Pad, it seems to be simple enough to build. Thank you for the instructions. Any suggestion were I could find the resistors and the jack to build it? RadioShack? Too bad I don't have the parts now, tomorrow would be a good time to build it as I will be most likely snowed in.

That was for the Sennheiser HD598's I'll try to figure out what to do or your 225's and post it in a couple of days. I have to do some serious snow removal tomorrow morning.

post #3425 of 4373

Thank you, that would be great! Your input will be very helpful for all Grado/Vali owners. I will be doing a lot of digging out also tomorrow, it's just getting started here and it's coming down fast.

post #3426 of 4373
Quote:
Originally Posted by Spiral Out View Post
 

Thank you, that would be great! Your input will be very helpful for all Grado/Vali owners. I will be doing a lot of digging out also tomorrow, it's just getting started here and it's coming down fast.

I did a quick calculation.

Putting a 1.3 Ohm resistor between the amp's output and the transducer and a 10 Ohm resistor across the transducer would give you a -6.12 dB loss. You would do this for both channels. I'm taking a potshot at the dB loss, but I think that should work.

You can try this out by using clip leads, a solderless breadboard and jacks to make the circuit to try. If it works then you can match as close as you can from a bunch of resistors to get resistors for both channels to keep their balance when you build the final gadget. In other words you want the 1.3 Ohm resistors in both channels to be as close to each other as possible and do the same for the 10 Ohm resistors.

 

You can get a cheap solderless breadboard at the radioshack nearest to Stonehenge.:D (your Head-fi location)

 

The 1.3 Ohm resistor goes in series with the Vali's 6.5 Ohm output impedance forming a 7,8 Ohm equivalent that goes in series with the transducer (32 Ohms) that has a parallel 10 Ohm resistor and creates a divider. This forms an attenuator with the headphone load. If the Vali's output impedance is actually lower than the spec'd 6.5 Ohms then you won't get as much attenuation and the 1.3 Ohm resistor would have to go up in value. This is where breadboarding a trial comes in handy.

The goal is to get the right amount of attenuation and keep a load on the phones that is close to 4 Ohms for good damping.

 

Below is an example of one channel

Vali Output----1.3 Ohm Resistor----|------- transducer/earcup --------|
                                   |-------10 Ohm Resistor------------|---------Ground
post #3427 of 4373

Finally got back my HD600s and plugged them into the Vali. I must say, I shouldn't have held off buying these for so long. 

post #3428 of 4373

Anybody plugged the LCD 2.2 into the Vali ? Listening to Boston and the music is just beautiful with no hint of any noise.....it just sounds right to me ...

post #3429 of 4373
Quote:
Originally Posted by AnalogSavior View Post
 

Just thought I'd comment on the noise level of Vali now that I've had it for some time with it, as its a potential turn off to those considering it.

 

Its a noisy amp, no doubt about it.  About as noisy if not just slightly noisier than portable devices with sensitive IEMs.  That being said, most of the time, the recording noise on most songs tends to be louder than the background noise at my listening levels (which is about 9 to 11 o'clock).  If you are listening to it louder it should not be an issue at all, in my opinion.  However, if simply knowing that there is noise somewhere in the background that does not belong to the recording bothers you, then I guess its not for you.  Which is a shame, because its a great sounding little amp.

 

Just my two cents on an issue I've been asked about before.

 

Yes, but on the bright side, when you get to be over 40, your tinnitus will probably be louder than any background noise. :ksc75smile:

post #3430 of 4373

Thank you very much StanD! I really appreciate you taking the time to figure out the parts and configuration of the L-PAD.  I'm going to run out to see the mystical dwarfs at my local Stonehenge location Radio Shack as soon as I can dig out of this mess :D It may be a couple of days but I will keep you posted.

post #3431 of 4373
Quote:
Originally Posted by Spiral Out View Post
 

Thank you very much StanD! I really appreciate you taking the time to figure out the parts and configuration of the L-PAD.  I'm going to run out to see the mystical dwarfs at my local Stonehenge location Radio Shack as soon as I can dig out of this mess :D It may be a couple of days but I will keep you posted.

Keep in touch, I can help you tweak or make adjustments to what you find.

post #3432 of 4373

I will definitely keep in touch. I will post  impressions/pictures when I'm done. There are a lot of Grado and Vali owners out there from what I've read. I think this L PAD will be very useful for them or anyone using Grados with a high output impedance amp. Thank you so much!

post #3433 of 4373
Quote:
Originally Posted by Spiral Out View Post
 

I will definitely keep in touch. I will post  impressions/pictures when I'm done. There are a lot of Grado and Vali owners out there from what I've read. I think this L PAD will be very useful for them or anyone using Grados with a high output impedance amp. Thank you so much!

The Vali is not a high impedance amp, it's just not very low impedance, it's 6.5 Ohms. A typical pure tube OTL amp is much higher and would require a different solution, the Vali is a hybrid with an SS output stage. If the Vali had a much lower output impedance then that 1.3 Ohm resistor would have to go up a few Ohms to compensate. Hopefully that 6.5 Ohm figure is correct. I'll see if I can get a ballpark measurement of that this weekend.

post #3434 of 4373

I'm used to solid state amps with low output impedance so in my experience it seems high. I have never listened to an OTL amp, but I would very much like to. The whole tube thing it new to me, but I am enjoying it for sure. I appreciate any more input you could provide!

post #3435 of 4373

My woody SR80i pairs well with the Vali and Modi. Just wondering if a higher end DAC like the Bifrost or Gungnir might make it sound better...

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