I can't say anything better about Jeff than what everyone else has said. We lost a great guy and contributor to our niche hobby.
Paul
Paul K.
Seasoned Veteran
Last Activity: Today, 06:23 PM
Joined: 09-28-2005
Location: Hilliard, Ohio
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I understand Italy didn't do enough soon enough, that they have a larger percentage of elderly people who are more at risk compared to many other countries...Leave a comment:
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I look at the infection and death stats every day. For the whole world the death rate is ~4%, but Italy's climbed to 9% today. In the USA, the death...Leave a comment:
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Steve, this may sound dumb but maybe your trash folder is full (if that's possible) and when you try to delete messages and send them to Trash, they can't...Leave a comment:
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Okay, happy to help out. Don't hesitate to get back to me with questions when you get around to building your design.
Paul...Leave a comment:
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Once I gained experience with Martin's worksheets, plus built several speakers based on that modeling, I gained confidence in both Martin's work and my...Leave a comment:
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Exactly what is it about the design that's predicted by your attached worksheet that you aren't happy with? Are you pretty much settled on something similar...Leave a comment:
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I'm here to help if I can. I took a gander at your attached work sheets and don't see anything wrong or bad about the results. The overall response...Leave a comment:
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I was wondering recently how Jeff was doing and wasn't at all aware of his current problems. Hope he recovers soon.
PaulLeave a comment:
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See the attached graph (red line) which shows the impedance of the fully stuffed line.
Paul
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I set up the model again with one change; I stuffed the whole line at 1 lb/ft3 (a little over 8 ounces total of poly fiber needed) and I've attached the...
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In my model I located the driver's center 7" from the beginning of the line (the closed end) which is ~20% of the line's length and one of the two...Leave a comment:
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With 0.6 ohms in series, this driver's Qts became 0.525, and from that and its fs, I estimated the optimum tuning frequency (the line's 1/4-wave resonance)...
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One more question. Will this driver be crossed at ~60 Hz with a passive crosssover to the sub? If so, do you have an approximate value for the resistance(s)...Leave a comment:
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Later today, if you want, I'll set up Martin King's TL modeling software and perform some exploratory modeling for your driver to see what's what....Leave a comment:
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What is the driver's Qts? If it's around 0.4, I'd shoot for a system tuning frequency around fs, and that would theoretically need a line length of ~52"...Last edited by Paul K.; 03-12-2020, 01:32 PM.Leave a comment:
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To clarify, this TL design, while appropriate for the drivers involved, is inherently not a good performing design because a constant cross-sectional...Leave a comment:
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From the partially dimensioned cabinet drawing shown in the video, I estimated the total line length is ~690 mm or ~27", and the midpoint of the...Leave a comment:
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I skipped through the video and didn't see/hear any dimensions given, particularly how long the line was. It certainly could be an effective TL if its...Leave a comment:
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Summer heat and humidity causes the virus' molecules to become heavy and fall to the ground, not being able to be transmitted in the air nearly as much...Leave a comment:
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