sonosub planning phase - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #41 of 47 Old 11-10-11, 09:50 AM
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Re: sonosub planning phase

Going back to post #37. Port length should be 19.8 inches , not 27.82". All three models are going to need a hi-pass filter, the 24.25 hz and the 19.8 hz tuning to protect the driver, and the 14 hz tuning because the airspeed would be too high without one.




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post #42 of 47 Old 11-10-11, 09:56 AM Thread Starter
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Re: sonosub planning phase

I thinkbthe longer port length was to accomodate an 8" port diameter. I dont have access to win isd but i think that was how it broke down. I *should* be able to fit three 8" ports I think.

What are your thoughts on the volume changes involved in the inactive ports? Should I add that volume to the models of the lower two tunes to be more accurate?

Thanks for checking my work, I tend to miss some important details...

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post #43 of 47 Old 11-10-11, 10:30 AM
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Re: sonosub planning phase

8" ports would be about 27.5" long each. The unused ports add to the net volume of the box, each one is .8 cu.ft. Here's how they model with 1000 watts and the appropriate hi-pass filters for the two higher tunings.

sonosub planning phase-grandma.jpg




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post #44 of 47 Old 11-10-11, 11:13 AM Thread Starter
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Re: sonosub planning phase

Thanks a bunch, Mike. They seem to roll off a little more steeply than id hoped, but thats the HPF, in your opinion is there anything to gain by lengthening the ports a bit more to get the low tune right at 14hz? Also, would you say 8" is adequite with some big flares? Or do i need to figure something else out? I was thinking of either square or even rounde triangular mdf ports. So long as the area is the same the shape doesnt matter much, right?

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post #45 of 47 Old 11-10-11, 01:23 PM
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Re: sonosub planning phase

A 15 hz tuning would be as low as I'd go, just my opinion. 8" diameter ports with flares will do the job just fine. Round would be better as it's said they flow air better.




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post #46 of 47 Old 11-10-11, 01:32 PM Thread Starter
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Re: sonosub planning phase

Is there any rule on how far apart the ports sould be? Im thinking of trying to fit them all behind an 18" speaker grille. Either that or im sure ill have enough scrap to make an mdf ring and slap some fabric over it.

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post #47 of 47 Old 11-10-11, 01:46 PM
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Re: sonosub planning phase

They can be close together, just make sure there is enough material in between them for a secure mounting.




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