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Multi-Way Conventional loudspeakers with crossovers

how many Liters for my 15"
how many Liters for my 15"
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Old 13th August 2019, 06:15 AM   #11
GM is offline GM  United States
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Quote:
Originally Posted by Cal Weldon View Post
Note it's missing Re = 3.9 ohms for nominal 8 ohm for the other specs to work.

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Old 13th August 2019, 06:22 AM   #12
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Originally Posted by alexfisher7 View Post
How many liters should I build my trapezoid speaker box to host a 15" speaker.
or more like how small can I get away with.
For prosound, recommend ~127.78 L net tuned to Fs for best trade-off between size, power handling.

Smallest would be ~90 L tuned to ~50 Hz for flattest response.

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Old 13th August 2019, 12:13 PM   #13
marabella is offline marabella  Germany
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I recommend "bassCADe" - www.selfmadehifi.de

It will meet all your demands in every aspect and best: It will give you all dimensions of the enclosure parts.

I have used it to calculate an enclosure for my 3-way sealed speaker and the simulated FR is verified by real F-measurement.
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Old 13th August 2019, 03:25 PM   #14
weltersys is offline weltersys  United States
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Quote:
Originally Posted by Cal Weldon View Post
Alex, AFAIK, they're the only ones who do that. Seems counterintuitive but they are well respected and have been doing it for all the time I've been in this hobby.
Cal,
Beginning in the early 1990s, JBL began an "orderly transition" to the positive-to-red standard in accordance with practices recommended by the AES, EIA, IEC, and other standards organizations.

http://www.jblpro.com/ProductAttachm...eN1V12C_v5.pdf

That said, the 2025HPL is not listed in that tech note.
It is always best to check each unit for polarity (a simple "pop" with a 9volt battery will push the cone forward or back) as any unit may be wired wrong from the factory or after a re-cone.

Art
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Old 14th August 2019, 05:44 PM   #15
Cal Weldon is offline Cal Weldon  Canada
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how many Liters for my 15"
Hi Art,
I had heard that but when I read the black is + I thought perhaps I was mistaken.
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Old 14th August 2019, 11:00 PM   #16
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Originally Posted by marabella View Post
I recommend "bassCADe" - www.selfmadehifi.de
Impressive! Surprised it's not more well known on the English forums.

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Old 14th August 2019, 11:15 PM   #17
MrKlinky is offline MrKlinky  United Kingdom
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For what it's worth, triangular corner vents are about the worst possible shape you can make a port. Please consider straight tubes at the very least. You can lose many dB of output through port compression, and add even more dB of distortion by selecting an unsuitable shaped port! One large and properly flared port is the best option.
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Old 15th August 2019, 02:19 AM   #18
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Indeed! Pretty much gave up getting folks to use one big vent once my 'soapbox' wore out though.

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Old 15th August 2019, 07:19 AM   #19
MrKlinky is offline MrKlinky  United Kingdom
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Indeed! Pretty much gave up getting folks to use one big vent once my 'soapbox' wore out though.

GM
Quite - a hole is a hole to most folks. Such a shame because there is so much to be gained (or reduced!) almost for free with a little bit of extra work on this 'hole'! There are a limited amount of port white papers on the web, but some with very good pragmatic information which can be readily reproduced by the DIYer.
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Old 15th August 2019, 07:26 AM   #20
daemonsgr is offline daemonsgr  United Kingdom
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Originally Posted by MrKlinky View Post
Quite - a hole is a hole to most folks. Such a shame because there is so much to be gained (or reduced!) almost for free with a little bit of extra work on this 'hole'! There are a limited amount of port white papers on the web, but some with very good pragmatic information which can be readily reproduced by the DIYer.
So having a similar design task (2226h around 120-130L) I had in my cad two round holes.
Should I just do one big rectangular?! Do side ratios play a big game?
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