sonosub planning phase - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 47 Old 10-25-11, 11:47 PM Thread Starter
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Re: sonosub planning phase

Ive been modeling the Titanic 15 in a few differet arrangements and im getting some nice looking graphs with about 400 liters and 1, 2 or three ports 6" ID and about 20" long. Tuning would be 14.72hz with one port open, 20.82hz with two ports open, and 25.5hz with all three open. All three potrs blocked gives a sealed qtc of .584 and respectable looking response into the teens.

One question now is whether the ports that are blocked should still be deducted from the overall volume of the enclosure. I wouldnt think so, but air acts all crazy like sometimes.

Im also trying to estimate how much power I can feed them in the different alignments, so Im tinkering with highpass filters, which I have somehow avoided learning much about, but if I apply filters to the appropriate frequencies for each alignment and power them accordingly to stay at or slightly under xmax at all times, the middle and high tunings seem to jump out as the best performersfor daily use, while the lowest tune has major extension for those times i may want to trigger tsunami.

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post #32 of 47 Old 10-26-11, 10:49 AM
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Re: sonosub planning phase

I was trying to model the Shiva a while back with just such a design. The limitation I found wasn't xmax so much that it was air speed when using only the higher tunings/fewer ports. I suppose your choice of 6" ports may have alleviated that, just check that they're not above ~26 m/s while driving them near xmax with those higher tunings (fewer ports).


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post #33 of 47 Old 10-26-11, 10:57 AM Thread Starter
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Re: sonosub planning phase

Doesnt adding ports raise the tuning? More port area=higher tuning right?

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post #34 of 47 Old 10-26-11, 11:34 AM
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Re: sonosub planning phase

Yes.




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post #35 of 47 Old 10-26-11, 11:53 AM
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Re: sonosub planning phase

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yourgrandma wrote: View Post
Doesnt adding ports raise the tuning? More port area=higher tuning right?
Late night

Reverse the info and check the airspeed for the lowest tuning.


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post #36 of 47 Old 11-01-11, 09:31 AM Thread Starter
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Re: sonosub planning phase

Why do i keep reading!!??!!??

Im looking at the Fi SSD18 now. Havent had a chance to model it yet but i would think an 18 with higher power handling and mor x max at almost the same price would be a move in the right direction.

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post #37 of 47 Old 11-07-11, 09:00 PM Thread Starter
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Re: sonosub planning phase

Looks like the last post I made didnt come up.

Im trying to figure out why I have such a humpy response curve with the SSD18.Is this telling me its not suited for what Im doing or what?

Maybe this will help...



All three plots use the same size enclosure. The ports are all 6" diameter and 27.82" long.

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post #38 of 47 Old 11-07-11, 09:15 PM Thread Starter
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Re: sonosub planning phase

Heres the port velocity. Its in FPS, but still is insanely high. I presume ill be able to keep it under control once I figure out how to set up highpass filters to keep excursion in check.


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post #39 of 47 Old 11-08-11, 12:38 PM Thread Starter
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Re: sonosub planning phase

Oh! What i had asked in my missing post was how the unused potrs will affect the enclosure volume.im guessing the unused ports will act like theyre not there and add to the net volume, corrrect? So if i build to 16cu ft with three ports, plugging two of the ports will add their volume to the net system volume. This might be helpful but id like some opinions.

Also, what port size am i going to need to keep velocity reasonable? Length and volume compensation start to get pretty extreme if i go with an 8". How much do very large flares help? If need be i could make some pretty hardcore flare ends in a cnc.

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post #40 of 47 Old 11-10-11, 09:10 AM Thread Starter
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Re: sonosub planning phase

Anyone want to comment on this design or did i drive you all away with my indecision? Hehe If everything looks good i think im going to order drivers next week.

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