My_Ref Fremen Edition RC - Build thread - Page 98 - diyAudio
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Old 18th March 2013, 12:03 AM   #971
Reality first!
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Originally Posted by squalor View Post
... at least you didn't drop off the face of the earth like me.
Welcome back!

Don't be discouraged... I'm sure you'll do it right with RC boards.
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Old 19th March 2013, 02:34 AM   #972
SoIL4x4 is offline SoIL4x4  United States
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A few pics of the nearly finished build. The entire construction is made up of two main parts, the main chassis and the outer enclosure. The pics below are of the main chassis, the rear panel is attached so that the entire finished unit can be removed from the outer enclosure without the need to disrupt any wiring. I apologize for the fuzzy cell pics..I will try to get some shots of the outer enclosure tommorow.
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File Type: jpg chassis bottom.jpg (43.4 KB, 196 views)
File Type: jpg chassis side.jpg (32.5 KB, 185 views)
File Type: jpg chassis side bottom.jpg (32.3 KB, 185 views)
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Old 19th March 2013, 08:53 AM   #973
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Originally Posted by SoIL4x4 View Post
A few pics of the nearly finished build.
Really nice!

Can't wait to see the complete build...
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Old 19th March 2013, 10:25 AM   #974
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Really Clean! Keep up the good work.
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Old 25th March 2013, 10:43 PM   #975
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Red face The Question Nobody Asked

Can you feed a MyRef amp with a balanced signal through a balanced line receiver?

In theory, any single ended amp should be able to get a balanced signal this way, but I had a few questions.

1. The differential line receiver needs a few milliamps DC power. Can I supply it from the FE regulated voltage supply without problems?

2. The MyRef (an FE RC in this case) has a little bit unusual grounding scheme with audio ground and the speaker negative terminal separated by a 1 ohm resistor. If I connect the audio ground of the differential line receiver in parallel to the MyRef audio ground at the input cable connector, would any noise be introduced?

3. My first attempt of a differential line receiver uses an AD797 opamp which is notoriously fussy. Are there any oscillations or any other noise problems with my little board design?

4. What is the sound difference, if any, between balanced and single ended?

http://www.diyaudio.com/forums/attac...1&d=1364250979

This is my little stereo differential line receiver. I've learned more since I designed it, so I would do things differently the next time, but it works. Questions 1 and 3 are answered with no problems. Question 2 is no problem either. Background noise is silent and music plays normally.

Now the big question. How does it sound. I need a little time before coming to any conclusions. First impression of the balanced connection is that it is even more detailed, but I am set up for quick changes between single ended and balanced and I need to do the back to back comparison.
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Old 25th March 2013, 11:09 PM   #976
bcmbob is offline bcmbob  United States
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Jac,

I asked the question(s) long time ago but everyone ignored me.

Thanks for digging in with more than questions - a real application. Beyond any differences in sound quality, it's my understanding that if needed, longer interconnects can be used in balanced mode.

I'm on the giant waiting list for the new Jean-Paul/Subbu DAC which has or will have a balanced configuration. An end to end balanced system is floating at the top of my bucket list. Never heard of a pro recording studio using a single ended setup.

Please keep us informed.
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Old 25th March 2013, 11:27 PM   #977
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I am waiting for subbu dac as well
I have a chance to set up balanced system but not sure if it is worth extra effort :/
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Old 25th March 2013, 11:54 PM   #978
bcmbob is offline bcmbob  United States
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VOX,

We can let Jac take all the risks, do the hard work - and if successful we can take the credit and tell everyone it was our idea.
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Old 26th March 2013, 10:35 AM   #979
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Bob,

Of course it is your idea;-) You are the font.

As I have been listening, I have been thinking about the signal path. Almost all DACs deliver their signal as a balanced signal. Somewhere in the approximate zone of the analog, low-pass anti-alias filter, the DAC designer either outputs the balanced signal or combines the signal into a single ended signal. That means some electronics which may affect the sound. It may mean a different low pass filter solution for single ended.

Of course the wire is different, but if you are using a single ended amplifier, you also need a line receiver to convert from balanced to single ended signal and that could affect sound. The total amount of electronics is probably about the same balanced between balanced and single ended, but the where and how is different.

If you really want to do balanced end to end, you could do something like Twisted Pear's Sympatico or other discrete solutions that stay balanced through the amp. I've always been a little curious about the Sympatico since Russ White at Twisted Pear started with the MyRef and has moved to the Sympatico.

Enough rambling on my part. More listening.

Jac
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Old 26th March 2013, 11:05 AM   #980
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Originally Posted by lehmanhill View Post
3. My first attempt of a differential line receiver uses an AD797 opamp which is notoriously fussy.
When I implemented a balanced receiver if found the information from Rod Elliot at ESP very helpful (and detailed). I plumped for using the INA2134, which I perceived as sounding better than the SSM2141. However the recommendations on Rod's site seem to suggest that a THAT chip is much better. None-the-less I am very happy with the INA - but might try the THAT chip in the future.

Cheers
Geoff
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