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Multi-Way Conventional loudspeakers with crossovers

Crossover frequency for transmission line
Crossover frequency for transmission line
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Old 16th April 2018, 08:42 PM   #21
phivates is offline phivates  United States
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Time to do some reading on the basics of quarter wave enclosures
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Old 16th April 2018, 08:49 PM   #22
Cliveinuk is offline Cliveinuk  United Kingdom
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Sorry Paul
re read your post and got the 24:1 taper didnt understand it because it is so extreme a taper
with such a small vent at the end !! is that plausible most youtube versions I have seen are either straight line or a much smaller taper 1.5 to 1 etc
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Old 16th April 2018, 08:52 PM   #23
Cliveinuk is offline Cliveinuk  United Kingdom
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Quote:
Time to do some reading on the basics of quarter wave enclosures
never seen one with such an extreme taper and usually the driver is at the start of the line
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Old 16th April 2018, 09:57 PM   #24
planet10 is offline planet10  Canada
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Crossover frequency for transmission line
Clive,

MDF is not a recommended build material. Use quality plywood. With a driver as large as the Morel intended, 15mm might do (it would if you had a pair loaded push-push). 18mm plywood would probably be recommended for a single driver.

Quote:
24:1
Here is a sketch of what Paul specified. It would normally be folded once to create a useful package.

Crossover frequency for transmission line-pkitt-morel-uw-1058-tl-png

dave
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Old 16th April 2018, 09:59 PM   #25
planet10 is offline planet10  Canada
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Crossover frequency for transmission line
Quote:
Originally Posted by Cliveinuk View Post
never seen one with such an extreme taper and usually the driver is at the start of the line
The taper is severe, but that makes it more compact. Paul is well known for his heavily tapered lines. Since the advent of proper TL-modelers, an end-loaded driver is rarely seen.

dave
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Old 16th April 2018, 10:15 PM   #26
Cliveinuk is offline Cliveinuk  United Kingdom
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Dave , thank you for that , I guess I was expecting the end of the line opening to be bigger than that.
my question about material was more to do with the effect of one vs the other and how it played out on the baffle step
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Old 16th April 2018, 10:22 PM   #27
planet10 is offline planet10  Canada
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Crossover frequency for transmission line
Material choice does not affect baffle step. Enclosure shape and driver placement are the factors.

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Old 16th April 2018, 10:44 PM   #28
Cliveinuk is offline Cliveinuk  United Kingdom
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Dave (moderator)

how do I attach an image/photo to a post ( your insert image is asking for a URL
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Old 16th April 2018, 10:47 PM   #29
pkitt is offline pkitt  United States
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To any of you concerned about my use of "severe" tapers, I'd much prefer they to be called aggressive because there's nothing about the modeled or sonic results that's at all severe. I never use a taper less than 10:1, simply because of its attributes of making the line a lot shorter and, more important, smoothing out the ripples in the response like more stuffing would do but without sacrificing low-end output. I've used a taper ratio of 16:1 and 25:1 quite effectively in personal builds. The only way an aggressive taper can be problematic is if the air velocity in the end of the line becomes excessive and I always make sure that is not an issue (17 m/s or less) when the driver is driven to Xmax and a bit beyond at a frequency that is likely to be part of the musical content.
Paul
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Old 16th April 2018, 10:51 PM   #30
planet10 is offline planet10  Canada
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Crossover frequency for transmission line
Quote:
Originally Posted by Cliveinuk View Post
your insert image is asking for a URL
You also have the choice of uploading a file from your computer.

dace
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