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Old 9th September 2012, 03:29 AM   #1531
Zen Mod is offline Zen Mod  Serbia
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I expect one or few more tricks from Pa , but it's not mine to reveal them
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Old 9th September 2012, 03:37 AM   #1532
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I expect one or few more tricks from Pa , but it's not mine to reveal them
I am eagerly waiting for them and trying to figure out what they might be. Perhaps I should tweak the circuit and its parameters some more.
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Old 9th September 2012, 03:39 AM   #1533
lhquam is offline lhquam  United States
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How does this relate to the F6?

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just for your amusement

pics of next (semi public) Bfish Ikebana



(we must keep this silly thread alive , or Pa will forget to publish bloody article , to stop this agony )
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Old 9th September 2012, 03:46 AM   #1534
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we were talking about Ikebana style prototyping
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Old 9th September 2012, 06:31 AM   #1535
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I expect one or few more tricks from Pa , but it's not mine to reveal them
All will be revealed on April 1st, 2013

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Old 9th September 2012, 11:13 AM   #1536
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I suspect the "boomy" sound on the bass is due to a low damping factor of about 4.6. I estimate the output impedance is around 1.7 ohms. The closed-loop gain is 4.7.
Your loudspeakers were optimized by its manufacturer to work with an ideal voltage source amp [Zo <0.1 Ohms]. Now you drive the same loudspeakers with TEASER 6 of higher Zo = 1.7 Ohms. TEASER 6 gave you [and us] the correct and expected answers. Your build is A+. Its got power, low %THD, is stable with no hum and buzz. Unfortunately, its loudspeaker mate is suboptimal. What is Zo for your F5 build?
  • Do know the impedance versus frequency curve of your loudspeaker especially in the midrange; to explain the mud and listener fatigue?
  • The classic designs used a voltage gain stage on the primary side of the transformer. kasey197 used a step up transformer to harness more open loopl gain than available as depicted by Conceptual F6. You also have indicated other options to lower Zo!
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Old 9th September 2012, 11:29 AM   #1537
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That was the point i was mqking earlier.
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Old 9th September 2012, 11:34 AM   #1538
lhquam is offline lhquam  United States
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Here is Stereophile Mag's impedance measurement of my B&W CDM1 speakers. Yup, my next tweak will be to lower the output JFET source resistors to somewhere near ZERO ohms, which will increase open-loop gain to around 100 or so. I could also reduce the closed-loop gain below 4.7, requiring an input source capable of higher voltage drive.

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Your loudspeakers were optimized by its manufacturer to work with an ideal voltage source amp [Zo <0.1 Ohms]. Now you drive the same loudspeakers with TEASER 6 of higher Zo = 1.7 Ohms. TEASER 6 gave you [and us] the correct and expected answers. Your build is A+. Its got power, low %THD, is stable with no hum and buzz. Unfortunately, its loudspeaker mate is suboptimal. What is Zo for your F5 build?
  • Do know the impedance versus frequency curve of your loudspeaker especially in the midrange; to explain the mud and listener fatigue?
  • The classic designs used a voltage gain stage on the primary side of the transformer. kasey197 used a step up transformer to harness more open loopl gain than available as depicted by Conceptual F6. You also have indicated other options to lower Zo!
Attached Images
File Type: jpg CDM1-impedance.jpg (27.6 KB, 218 views)
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Old 9th September 2012, 11:44 AM   #1539
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Listener fatigue does not fit what i would expect. I would expect smooth and transparent.
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Old 9th September 2012, 11:50 AM   #1540
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That was the point i was mqking earlier.
buzzforb. I second you opinion and first point you made earlier. You also build and know loudspeakers very well.
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