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Edgar last won the day on November 12 2013

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  1. Edgar

    D. B. Keele

    Anybody on the Forum in contact with Don Keele? I was in an extended email conversation with him a couple of weeks ago, when he suddenly stopped replying. I'm concerned that he might have fallen ill, or worse.
  2. I searched and found almost nothing -- a few references to copper-plated screws, but nothing in the metric size that you cited and everything in bulk quantities. However, I did find this: DIY Copper Plating. Might get you there.
  3. Looks like a reasonable tune for that enclosure size. As they used to say, "It's not nice to fool Mother Nature." Tuning for extended LF response generally results in poorer transient response.
  4. Another possibility for the port flare: https://www.velossatechdesign.com/products/generation-4-interchangeable-big-mouth-flare-inlet-only. Multiple sizes, shapes, and colors available.
  5. If you're handy, you might be able to adapt one of these: https://www.knobs.co/schaub-and-company-441-contemporary-finestrino-pull-flared-rectangle-64-mm-441/ EDIT: https://www.wwhardware.com/media/wysiwyg/images/schaub/collections/finestrino.jpg
  6. https://www.subwoofer-builder.com/flares-rectangular.htm https://www.stevemeadedesigns.com/board/topic/164631-how-to-big-flare-a-slot-port/
  7. https://community.klipsch.com/index.php?/topic/172686-ht-2-12-subs-vs-1-15-sub/&do=findComment&comment=2555558
  8. Above the tuning frequency, the cone motion dominates. At the tuning frequency, the cone motion is at a minimum and the port dominates. Below the tuning frequency, the cone and the port start to move out-of-phase, so they are fighting each other. This is the reason that it's a waste of effort to try to EQ a vented enclosure below its tuning frequency. All it does is waste power and increase distortion because of high cone excursion.
  9. I estimated the internal volume of the CW4 as 175 liters. Three ports, dimensions as you specified, in each case.
  10. I think that there might be a fundamental misunderstanding here. Ports with different cross-sections but the same internal volume will not achieve the same box tuning. For example, allow WinISD to create a BB4/SBB4 vented box for the Kappa-15c, and it will offer an 87 liter box tuned to 31.00 Hz. It will default to a port 10.20 cm diameter and 21.75 cm long. Keep the same tuning but increase the diameter to 14.42 cm (doubling the cross-sectional area), and the length increases to 47.83 cm. The port volume increases from 1777 cm³ to 7811 cm³ for the same tuning.
  11. Found it. For future reference: https://community.klipsch.com/index.php?/topic/185524-rewiring-klipschorns/&do=findComment&comment=2407798 It looks like all of Jeff's original posts have been deleted, but remnants can still be found in responses that quoted him.
  12. Yeah, me neither. I had it wrong at first, had to edit to correct.
  13. Wasn't the Medwin Constant 57 1/8", or something like that?
  14. That is something upon which we can both agree. I don't understand what you're trying to say and you don't understand what I'm trying to say, so there is no reason for either of us to say anything more.
  15. I don't see how "ideally you want each driver's peaks to be time aligned when they are reproducing the same frequencies" equates to "the input of filter to output filter phase doesn't really matter it's the summed output to output that is important". Also, unless the lowpass and highpass outputs are perfectly in-phase at all frequencies, they may sum to unity at and near the crossover frequency on-axis but they won't sum to unity off-axis. Not a big problem in most living rooms, but a big problem in an auditorium.
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