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Aune T1 USB Tube DAC+ SS Amp Discussion Thread ***See first post for FAQ--Updated on 02/14/15*** - Page 468

post #7006 of 7011
Quote:
Originally Posted by creatip View Post

Well, according to the T1's spec here: http://www.noisymotel.com/product.asp?ProductID=449 (aune's official site is down for days), the T1 got output impedance of 10 ohms. I don't know if it's true or not, but if it's true, then yeah, might not be ideal for low impedance headphones....
It is 10 ohm. It's not the ideal 8:1 ratio, but I've never had many complaints about using the Aune with 32 ohm headphones.
post #7007 of 7011

I know this isn't related to the Aune T1 (although I will use it with them), but I just got a GREAT deal on a set of like new Shure SE425s!! (~$200)

 

I can't wait to hear these babies :atsmile:

 

I hope they pair well with my Cowon iAudio 9+

 

Quote:
Originally Posted by Hansotek View Post


It is 10 ohm. It's not the ideal 8:1 ratio, but I've never had many complaints about using the Aune with 32 ohm headphones.

 

I use them with 32Ω headphones every time I use the T1 (SoundMAGIC HP150).  Isn't the sensitivity just as or more important than the ohm rating?  My HP150s are 95dB/mW @ 1KHz (±3dB).


Edited by NCSUZoSo - Today at 8:59 am
post #7008 of 7011
Quote:
Originally Posted by NCSUZoSo View Post
 

I use them with 32Ω headphones every time I use the T1 (SoundMAGIC HP150).  Isn't the sensitivity just as or more important than the ohm rating?  My HP150s are 95dB/mW @ 1KHz (±3dB).

 

It also doesn't do anything (bad) to the sound, that I know of, to my 35 ohms HE400. Experimented on this tho, I deliberately added another load to add the output impedance. Added 22 ohms resistors to each channels, making a total of 32 ohms output impedance, feeding to a 35 ohms can. Purpose? Just bored, I guess :D It did do something to the sound. Hard to describe the difference, but it's there. 

post #7009 of 7011
Quote:
Originally Posted by NCSUZoSo View Post

 

Quote:
Originally Posted by Hansotek View Post

It is 10 ohm. It's not the ideal 8:1 ratio, but I've never had many complaints about using the Aune with 32 ohm headphones.

 

I use them with 32Ω headphones every time I use the T1 (SoundMAGIC HP150).  Isn't the sensitivity just as or more important than the ohm rating?  My HP150s are 95dB/mW @ 1KHz (±3dB).

 

They're different. The relationship between the output impedance of the amp and the headphone impedance is the damping factor. If the damping factor is too low, it can create unwanted resonances in the headphone's voice coil. This usually manifests as a loss of low frequency control and earlier bass roll-off. 

 

Here's an easy way to visualize it:
Imagine a bass note as a truck rolling down a hill. At the bottom of the hill there is a line where the truck is supposed to stop. Now imagine the damping factor as the brakes. If the brakes are strong enough, the truck can stop at the line where it is supposed to. If the brakes aren't strong enough, it will coast over the line before it comes to a full stop.

 

A damping ratio of 8:1 or greater essentially means "the brakes are strong enough to stop at the line." In reality, how noticeable or pleasurable this accuracy is, is probably somewhat subjective.

post #7010 of 7011
Quote:
Originally Posted by Hansotek View Post
 

 

Here's an easy way to visualize it:
Imagine a bass note as a truck rolling down a hill. At the bottom of the hill there is a line where the truck is supposed to stop. Now imagine the damping factor as the brakes. If the brakes are strong enough, the truck can stop at the line where it is supposed to. If the brakes aren't strong enough, it will coast over the line before it comes to a full stop.

 

A damping ratio of 8:1 or greater essentially means "the brakes are strong enough to stop at the line." In reality, how noticeable or pleasurable this accuracy is, is probably somewhat subjective.

 

Oh man, this is good. Permission to copy the analogy to other topics/forums :)

post #7011 of 7011
Quote:
Originally Posted by creatip View Post
 
Quote:
Originally Posted by Hansotek View Post
 

 

Here's an easy way to visualize it:
Imagine a bass note as a truck rolling down a hill. At the bottom of the hill there is a line where the truck is supposed to stop. Now imagine the damping factor as the brakes. If the brakes are strong enough, the truck can stop at the line where it is supposed to. If the brakes aren't strong enough, it will coast over the line before it comes to a full stop.

 

A damping ratio of 8:1 or greater essentially means "the brakes are strong enough to stop at the line." In reality, how noticeable or pleasurable this accuracy is, is probably somewhat subjective.

 

Oh man, this is good. Permission to copy the analogy to other topics/forums :)

 

Go for it. Electricity isn't the easiest thing to understand. I find these sort of "high school science class" analogies definitely help.

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