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In Reply to: RE: How about when using the I2S "output" - posted by theob on June 29, 2010 at 05:07:04
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Follow Ups:
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!
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