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I got the Sivga SV021 aka Robin in black colour. I use AutoEq for it which sounds ok, but I feel like you could make them even better. Is there anybody with with the same headphones wanting an Eq profile made by amirm? I'd like to send my headphones to him, but I got no response. :confused:
 
I would be very interested in a review of the audio performance of a USB docking station. (Typically these use DisplayLink chipsets). It would be great to see how much improvement can be gained by using a separate USB DAC compared to the standard 3.5mm headphone jack.

I have a Lenovo DU9019D1 sitting in a drawer and use a Targus DOCK180EUZ daily. I would be willing to ship the Lenovo one, however, I'm in the U.K. and I expect a similar USB 3.0 dock could be sourced locally for a very minimal outlay (you may even already have one).

What do you think?
 
@-Matt-
The answer is everything is very noisy for the Lenovo docks I've used. Noisy enough that it even makes video output problematic if you're running it through convertors. I thought it was the power supply to to dock, swapped those out for various models, tried doing battery only, etc.
 
Thanks Keened,

Yeah, noisy is what I expect; I just thought it would be nice to have a measurement of exactly how bad it is!

I.e. How many dB of SINAD can one gain by adding, for example, a Topping D10 or E30?

Also it would be nice for me (and potentially for others) to put a number to this (poor) level of performance, in order to build a mental picture of how SINAD numbers map to perceived audio quality. A USB dock is likely a sound quality reference that is available to many people.
 
Thinking about it... I know he already has a lot on his plate but...

IMHO it could be a good subject for one of Amir's videos. Select a few different DACs, each with a different level of SINAD performance ranging from bad to good to excellent - play samples from each and then describe/highlight the audible differences (with reference to the measurements).

(USB dock could likely be the bad example).
 
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Hi I would like to submit one of these for load testing with 8,4 and 2 Ohms dummy load testing to verify voltage behavior with a 500va and a 600va transformer
poweramp_pic.png
 
Hi I would like to submit one of these for latency testing of DC detection response
protect.png
 
wisechoice said:
Well, I bit the bullet and ordered a used SPL Volume8 that will be drop shipped to Amir for testing, after egging myself on with the help of others in this thread:

www.audiosciencereview.com

8-channel volume control

Assume 8 channels coming out of a multichannel DAC or 4x stereo DACs, in balanced or unbalanced format (let's assume unbal for simplicity). I want a ready to use product, no soldering/coding required. After some research I found the following options: 1. Mechanical potentiometers, e.g...
www.audiosciencereview.com www.audiosciencereview.com

Looking forward to seeing how it measures!
Click to expand...
Review just posted by Amir! https://www.audiosciencereview.com/forum/index.php?threads/spl-volume8-review.34870/
 
Is there anybody who does measurements in Hong Kong? I have a pair of on-ear headphones from literally decades ago. There is no brand information or anything. And I'm just curious how they performs compared to modern headphones.

I don't want to ship them anywhere because I think these were my grandpas, so I'd prefer if I can meet up with somebody who does measurements in Hong Kong.
 
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Amir how are you doing, I was wondering where you are located and if you have ever done measurements on cryogenic tubes vs the original manufacturers tubes before cryogenic treatment?

 
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I love the look of those cellular type horns. ;)
 
BicycleJoe said:
Amir how are you doing, I was wondering where you are located and if you have ever done measurements on cryogenic tubes vs the original manufacturers tubes before cryogenic treatment?
Click to expand...
I thought I had heard it all but I had not heard of this!
 
amirm said:
I thought I had heard it all but I had not heard of this!
Click to expand...
Perhaps that's where "The Audio Truth" lies?

Cryogenic treated tubes of course being so accessible, like a Cryogenic Lattes!

(actually cryo-lattes may not be a bad idea. Served up by strippers and charged at a Super Premium.)

You'd pay $10 for a stripper to serve you a Cryo-Latte wouldn't you?

Sure you would.
 
amirm said:
I thought I had heard it all but I had not heard of this!
Click to expand...
I never understood it (I’ve seen cryro-treated cables). What happens when it thaws and goes back to room temp?

upscaleaudio.com

Cryogenically Treated Vacuum Tubes

CRYOGENICALLY TREATED VACUUM TUBES. DONE TO UPSCALE AUDIO STANDARDS! Most of you already know that Upscale Audio is the premier destination for expertise and availability of vacuum tubes for high-end audio equipment. So when we offer services and options, you can be guaranteed that it represents...
upscaleaudio.com upscaleaudio.com

In a nutshell, reducing an object’s temperature to -300ºF re-arranges its molecular structure, creating greater uniformity that results in longer life and better performance than when the product was initially designed.

With vacuum tubes, this process has been claimed by some to have a profound impact on a tube’s ability to endure thermal shock, and improve both life and sound quality.

Upscale Audio does not make any claims. But we have many regular customers that demanded we make Cryogenically treated tubes available. We've done so by offering the best cryo treating service at a fraction of what others charge.
Click to expand...

  • Increases abrasive wear resistance
  • Requires only one permanent treatment
  • Creates a denser molecular structure
  • Produces a larger contact surface area that reduces friction, heat and wear
  • Changes the equipment’s entire structure, not just the surface
  • Subsequent refinishing operations or re-grinds do not affect permanent improvements.
  • Eliminates Thermal shock through a dry, computer controlled process.
  • Transforms almost all soft retained austenite to hard martensite.
  • Forms microfine carbide fillers to enhance large carbide structures
  • Increases durability or wear life (yet to be verified in tubes, but it is verified in many other parts including tools, racecar engines, and firearms).
  • Decreases residual stresses in tool steels
  • Decreases brittleness (this does not mean sonic brittleness)
  • Increases tensile strength, toughness and stability coupled with the release of internal stresses
Click to expand...
 
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