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In Reply to: RE: How about when using the I2S "output" - posted by jackwong96 on June 27, 2010 at 07:12:10
You said...'A new ground wire needs some time to break-in. The sonical difference may be some refinement in accuracy and depth of music, in particular at low level. Hope the alternative gnd connection will improve the SQ...'
Ok Jack: right on all counts except even more in my system. What I get is better bass and as result more space around instruments, more air. Definitely more depth and a sonic 'rightness' to the sound. I get better integration between highs and mids as mids are tightened up significantly. I ended up rebalancing my crossover points...down .2 db in bass and mids... to further improve my overall balance.
Thanks again for your unsolicited help!!
Follow Ups:
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Jack I can't believe the ease with which you diagnosed that I had an excessive capacitance issue then offered a super simple solution. Are you an audio electronics designer if not you should be. What do you do for a living?
hi theob, No. I'm not an audio electronics designer. I'm an amature who has an immensed interest in audio electronics. After more than 30 years of learning and diy, I can master the basics of audio electronics. As a hobby and second job, I once ran a shop where I built tube amps, did modifications for customers and sold vintage tubes. I treat audio electronics as an art and were not making good profits as would a business. Three years ago I closed the shop in order to focus on my first career, I now used it as a workshop cum listening room though.
I learned a lot from the contributions of cics and you guys, and in return, I will try to contribute if I could.
I notice you've rebalanced your crossover levels after implementing the alternative grounding solution. If you're interested and patient, I have an unimaginable story to tell about crossover leveling. A story about the beauty of a 0.01 ohm resisitor on a crossover.
Please do tell the story. For your info in my system I use passive crossover for my high frequencies (I think its a 12 db octave rolloff below 125 hz, it came with the speakers). For the bass I run part of my Buf32s output into a Behringer electronic crossover then from the Behringer directly to my mid bass and subwoofer amps.
Twenty odds years ago, I saw an audio electronics practitioner, who was my tutor, setting up a pair of speakers for a customer. At that time, I already have basic knowledge on setting up speakers and successfully built several pairs of speakers. I saw him using long chains of resistor to level the mid-range and tweeter. The chains of resistor consisted of various values, but strange enough, I found some values as small as 0.01 and 0.05 ohm.
I was curious as to why standard values couldn’t be used. He told me that standard values such as 0.1 ohm was far from ideal for setting up speakers; in order to achieve best accuracy 0.01 ohm was required. He also stressed that when perfect balance was achieved, either adding or removing a 0.01 ohm resistor would spoil the perfection and it would sound distinctly bad upon comparison.
Although he was a very experienced audio practitioner, I was very doubtful about his theory and had a lot of questions. Why I haven’t heard about that before? Why hi-end speakers weren’t built that way? Were human ears so sensitive to be able to distinguish the difference made by a 0.01 ohm resistor (equivalent to a piece of wire) on a tweeter or mid-range?
If what he said about cross-over leveling was true, all cross-over in commercial speakers would be inaccurate because only standard value resistors were used.
Guys, what do you think?
I don't know. What I do know is I want to hear part 2.
I don't know either. Hope there are only two parts so don't have to keep us in suspense!
Hi theob
Congratulation on the new improvement. Any diagram or photo to show your new implementation?
No diagram but I use 75 ohm teflon dielectric coax for each of the I2S lines. I combine the grounds of the coax @ juli@ then tie to one of the ground pins on Juli@. As Per Jack I float the ground ends of the coax at my Buf32s. Then I run a separate line from Juli@ ground to Buf32s ground. Thats it. Fairly simple but highly effective.
Key to using shielded coax is you can use longer I2S lines (mine are over 1.4 meters long). Those who use unshielded I2S lines are always emphatic to recommend very short lines to keep rfi at a minimum.
Thanks for the prompt reply. Yes, I understand the floating shield principle. Is your Buf32 an outboard DAC? How do you apply the 22ohm damping resistor?
Regards
The Twisted Pair Buffalo is a diy outboard dac using 8 ess sabre chips (4 a side in parrallel) to do the work. I soldered the 22 ohm resitors to the juli@ output pins then soldered my coax inner cable to the resistors.
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