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Bottlehead Amplifier Discussion / Comparison Thread: Crack, SEX & Mainline - Page 47

post #691 of 1613

He is right, sort of. The S.E.X. is single ended so you cannot create a true differencial signal path from your DAC to your headphones.  What you can do however is rewire the output transformers in such a way as to create a balanced output.  With the impedance switch boards the intention is that you wire the speaker binding posts to the +/- instead of to ground, or in my case i wired the XLR socket in that way.

 

Note you cannot use both balanced and unbalanced at the same time, to switch between them you have to flick the switches on the impedance boards, or if you hard wired the entire setup your stuck with whatever you wired it for.

post #692 of 1613
Whichever way he chooses to go i still recommend them over regular headphones jack

Sent from my LG-V500 using Tapatalk
post #693 of 1613

Cool. Thanks, I guess I'll have to wait and see how the T1s pair with my current setup. I hope it's not too crappy...

post #694 of 1613
Quote:
Originally Posted by olegausany View Post

Whichever way he chooses to go i still recommend them over regular headphones jack

Sent from my LG-V500 using Tapatalk

Interesting, why would that make a difference? 

post #695 of 1613
That's what i hear, details and transparency. When i tried it with SS amp it was confirmed by that amp owner who never heard headphones thru the speakers taps before and was surprised with result. We also tried LCD-2 with the same result. When i was getting SEX i still have for sale ability to use speakers taps was the reason i got it
post #696 of 1613

With the S.E.X. 2.1 there is no difference between the regular headphone jack and speaker outputs, the speaker outputs are wired directly from the headphone jack.  With the S.E.X. 2.0 the headphone jack had resistors in series so it would sound slightly different and have a lower power output.

post #697 of 1613
Differential and balanced are very different things. The S.E.X. amp is not differential (i.e. push-pull), because I don't think differential operation sounds as good as single ended. But the output of the S.E.X. amp can indeed be wired for balanced operation, which is defined as both hot and cold signal legs having the same impedance to ground. I encourage everyone to look up these terms and learn the distinction between the two.
post #698 of 1613
Thanks for info. The one I have exist since 2010 and still working great so probably why it's the difference plus it has upgraded resistors instead of stock
post #699 of 1613

Thanks to everyone for their valuable input. Everything is clear now. I'm happy to say that the S.E.X remains in my short list of consideration. 

 

I definitely agree that some tutorial about how headphone amp works (in principle) and differences between balanced/SE/differential would be super helpful and important. I'd guess that it doesn't require more than college physics level knowledge to understand. 

post #700 of 1613

Has anybody tried the Chord Hugo with their bottlehead amps?

post #701 of 1613
There are two separate and distinct usages of the term "single-ended" here:

(1) The S.E.X. output stage is running in single-ended class A configuration (as opposed to push-pull).
(2) Single-ended headphone wiring (the common norm) uses a shared common ground return.

Note that these are two different things. The meaning of "Single-ended" depends upon the context.
post #702 of 1613
Can infinity have a beginning? If so, it too is single ended.

I think there is something in that for all of us.
post #703 of 1613
Thread Starter 
LOL. That's deep, Nathan!
post #704 of 1613
Infinity is calling. Goodbye.
post #705 of 1613

I have just about decided that if I am going to get a headphone amp that I like and can afford I am going to have to build it myself so I am about to oder a SEX kit. My question is for you experienced builders out there (and this may prove helpful to anyone else contemplating building one of these). What tools do I need to build this in an optimal way. What size soldering iron, or soldering station (Any recommendations), solder sucker, small wire cutters. What else, vise? helping hands? magnifying glass/lens?

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