The SR71B, quad mono balanced . images pg 17 .Review pg 32, 34 . - Page 65

I too thought that this was not a safe thing to do, I seem to remember somewhere that running balanced into single ended could damage the amp but then again I could very well be wrong!

You can not do that. You will damage the amp.

The circuit is the same for both the SE & the balanced. You can not combine the negative & positive output of each channel together to create a SE output to drive the headphones.

You will damage the amp & void the warranty.

You should never ever use or  make an adapter cable to go from single ended source to the balanced input of the amp. Use only SE input on the SR-71B when the source is SE.

The balanced input of SR-71B should be used ONLY, ONLY, when fully balanced DAC or CD player is used.

When using SE input the amp will split the signal into two signals with opposite polarities to create a balanced signal that is fed to the rest of the amp.

Ray Samuels

 

 

Ray, don't quite understand how that is the case, but your advise is noted.  I have not tried the SR71b yet, but the PB2 sounded pretty nice that way.
 

 

It's not balanced to single-ended. That Beat cable is actually balanced with a 4 segment 3.5mm jack, which is used for the balanced amp on the HM801.
 

 

Wow, now -that's- cool! I didn't realise Beats made balanced TRS 3.5mm cable/plugs (at least from your homepage). Are they custom just for you? If only more makers would use such streamlined balanced TRS plugs instead of proprietary/funky looking ones.

I wonder if you are referring to an adapter to use on the output of the amp to the headphones...and Ray is warning about using an adapter to take a single ended source to the balanced input.  Two different situations... 

 

That is what I am talking about. But Ray refers to that part of the output also, just the the second paragraph of his response.
Edited by Jalo - 1/25/12 at 10:47pm

I can get you TRS 3.5mm balanced termination, it's easy. You just have to email me. 
 

 

SR71B now or wait at least 1 more month for the ALO RX MK3?

Both !

I tried almost all of the stuff mentioned here except the MkIII which hasn't come out yet, and my conclusion is that IEMs don't need these things, and even if there is an improvement, the improvement is not big. I now use my Galaxy Nexus headphone out to my Westone ES5 most often when I am just going out for a walk. There is a noticeable improvement with full-sized headphones though. I probably will skip the DX100 as well. I have the Hifiman 801 and Fostext HP-P1 which got dusted quite a bit because of the battery life. Not sure if I should add any more bricks to my collection, especially given that the DX100 charge/recharge time looks not much better than the above devices.

How long the SR 71-b can last in playback after fully charging?

About 10 hours

About 10 hours only? Thanks.

 

Then i would consider the Ibasso DX 100...

 

Only ten hours! Honestly, are you telling me your going to listen over the period of a day for more then ten hours!

I listen every single day, both out and about and then for a couple of hours at home and have never ever run the battery down to empty! You would give up exceptional sonic quality for battery life?

Just do what I do now. every other day when I get home I plug my complete rig in to charge even though it does not need it. It won't shorten the life of the batteries as they are lithium. do that and you won't have to think about battery life again!

Ray's amps in my opinion beat anything out there. You are, to all intents and purpose getting the Krell or Audio Research of the portable amp world!