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Multi-Way Conventional loudspeakers with crossovers

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Old 6th August 2003, 02:06 PM   #31
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once again
Quote:
Originally posted by ArthurSoares
Another question.. Where can I simulate plots of TL boxes?
??
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Old 6th August 2003, 02:38 PM   #32
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Go to www.quarter-wave.com

Then go to http://www.quarter-wave.com/Models/MathCad_Models.html

Downoad the MathCAD 8 demo which is linked there plus the worksheets Martin made.

Then you can simulate.

PS: When downloading the MathCAD demo, make sure you put it in the default folder. That folder is "Program Files\MathSoft". Do NOT create your own folder for it and then put it there!
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Old 6th August 2003, 05:26 PM   #33
Eul is offline Eul  Netherlands
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Quote:
Originally posted by ArthurSoares

What software u used and how could u reach Xmax with only 300watts?
I used LspCAD std. to simulate the enclosures. The X-max depends on how the enclosure is build and tuned and most important witch frequency you want it to play. The 300W is @20Hz. That the max. power of the woofer is 1600W RMS doesnít say it needs 1600W, the 1600W is only the max RMS capacity of the voice coil, if you would give it more it will burn. The true limit of most woofers is the X-max, thatís why I look to that instead of max RMS power. But donít worry, I think that if you put 300W on it and give it a sweep you almost get blown out of the room
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Old 6th August 2003, 05:38 PM   #34
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Quote:
Originally posted by Eul

I used LspCAD std. to simulate the enclosures. The X-max depends on how the enclosure is build and tuned and most important witch frequency you want it to play. The 300W is @20Hz. That the max. power of the woofer is 1600W RMS doesnít say it needs 1600W, the 1600W is only the max RMS capacity of the voice coil, if you would give it more it will burn. The true limit of most woofers is the X-max, thatís why I look to that instead of max RMS power. But donít worry, I think that if you put 300W on it and give it a sweep you almost get blown out of the room

okay. I Did know that, but what I was asking is that somehow our simulations were different. I mean, using that box u suggested: 80liters ported tuned at 26Hz, the excurssion with 300watts won't be even close to the X-max at least in WinISD Pro (using Ql 7)..

The X-max for this driver is 27.3mm in one way!.. WinISD give us the value for full way.. so according to the BRAHMA's manual it says that if your enclosure simulations doesn't hit 50 to 55mm in it's excurssion its okay!.

With that enclosure you would only get X-max at the point of <14.36Hz .. that's in my simulation.. what went wrong?

Try this box that's is suggested by the BRAHMA's manual..

5ft^3 tuned at 20Hz.. I Found another configuration..
5.5 ft^3 tuned at 24Hz.. ? Which one is better?
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Old 6th August 2003, 06:01 PM   #35
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My understand of the product (which is not much since
I haven't really looked at it), is the Tumult was a woofer than came
after the Brahma to target the home theater market,
where the Brahma is for the car audio market.

What causes the Brahma to perform better than
a Tumult for HT ?
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Old 6th August 2003, 06:06 PM   #36
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Quote:
Originally posted by thylantyr
My understand of the product (which is not much since
I haven't really looked at it), is the Tumult was a woofer than came
after the Brahma to target the home theater market,
where the Brahma is for the car audio market.

What causes the Brahma to perform better than
a Tumult for HT ?

I dunno either
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Old 6th August 2003, 06:14 PM   #37
Eul is offline Eul  Netherlands
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Quote:
Originally posted by ArthurSoares



okay. I Did know that, but what I was asking is that somehow our simulations were different. I mean, using that box u suggested: 80liters ported tuned at 26Hz, the excurssion with 300watts won't be even close to the X-max at least in WinISD Pro (using Ql 7)..

The X-max for this driver is 27.3mm in one way!.. WinISD give us the value for full way.. so according to the BRAHMA's manual it says that if your enclosure simulations doesn't hit 50 to 55mm in it's excurssion its okay!.

With that enclosure you would only get X-max at the point of <14.36Hz .. that's in my simulation.. what went wrong?
Maybe nothing went wrong? Apparently our simulation software calculates different things, who will say who is right and wrong? Personally I would believe LspCAD but I donít have proof mine is right and yours is wrong.

Quote:

Try this box that's is suggested by the BRAHMA's manual..

5ft^3 tuned at 20Hz.. I Found another configuration..
5.5 ft^3 tuned at 24Hz.. ? Which one is better?
Ehhh... what's that in liters?
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Old 6th August 2003, 06:17 PM   #38
Eul is offline Eul  Netherlands
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Quote:
Originally posted by thylantyr
My understand of the product (which is not much since
I haven't really looked at it), is the Tumult was a woofer than came
after the Brahma to target the home theater market,
where the Brahma is for the car audio market.

What causes the Brahma to perform better than
a Tumult for HT ?
Weíre looking to it because of the better price/performance ratio andÖ it performs well for a HT sub
I still recommend the shiva, I personally donít think youíll need more than that and you still need a shitload of power for the Brahma what will be expensive too.
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Old 6th August 2003, 06:26 PM   #39
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5 ft^3 == 141,60 Liters
5.5 ft^3 == 155,70 Liters


But now I recover to the manual! As you can see it recommends for home theater use a ported box of 5ft^3 (141,60Liters) tuned at 20hz.. According to Brahma's Owner Manual there is something about that power handling vs. enclosure vs. x-max. I'll quote it here

Quote:
"Just because a driver is rated a 1600watts does not means it NEEDS 1600W, or what it can handle 1600watts in your application! How much power do you need? In many sittuations, 200-400Watts is plenty. Do not over estimate what you need! You can easily get loud enough to cause permanent hearing damage with BRAHMA 12 in a 1Cubic foot Sealed box and 600Watt of Power"
Quote:
"... The larger the box, the LESS power is required for SPL level ... for example, a BRAHMA 12 in a 1 cubic sealed box will reach full Xmax at 1300W at 20Hz... In a 2.25 cubic ported and tuned to 30Hz, 500W will reach full Xmax at 20Hz."
this one is good
Quote:
".. if you're not sure how much power you need, ask around, or use good modeling program like WinISD PRO (not the regular/original version - The PRo version is what we want!) or other accurate modeling tool that shows excursion of the driver, and look the results. If the excursion breaks 50-55mm peak-to-peak, you're pushing too far."
What u say?

Check it out at: http://www.adireaudio.com/Files/BrahmaOwnersGuide.pdf
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Old 6th August 2003, 07:45 PM   #40
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Maybe this will help.

http://www.caraudioforum.com/vbb2/sh...hreadid=153191

You should come to this forum where Dan W. will
help you out. Nobody is more fascinated with bass
than the car audio folks. /hehe
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