Someone with a computer model this for me?

[Lbetts818]

I know general rule isn7-11 per cube for aeros. My box I'm planing will be 8 cubes with a 16" long 8" aero. That's 6.28 per cube. I want to tune to 28 just because I know what I like and that's my sweet spot. Will less port and low tune help me load better? I'd love to pay for a real design but just can't afford it. Subs will be 4 e 12s on a cab 1600. Power and wires not a issue to feed it. Thanks guys?

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[shredder1 10+ year member]

I know general rule isn7-11 per cube for aeros. My box I'm planing will be 8 cubes with a 16" long 8" aero. That's 6.28 per cube. I want to tune to 28 just because I know what I like and that's my sweet spot. Will less port and low tune help me load better? I'd love to pay for a real design but just can't afford it. Subs will be 4 e 12s on a cab 1600. Power and wires not a issue to feed it. Thanks guys?

I've got a computer and I took a quick look at how those E's model in the box you described... top curve is for 2 EVL 12's in a 5 ft3 net tuned to 31 hz... bottom is for 4 E's as you described... Is this what you want for a response?.. IDK about the rest of your concerns but I thought you might want to see this...

 

[Jeffdachef 5,000+ posts]

I know general rule isn7-11 per cube for aeros. My box I'm planing will be 8 cubes with a 16" long 8" aero. That's 6.28 per cube. I want to tune to 28 just because I know what I like and that's my sweet spot. Will less port and low tune help me load better? I'd love to pay for a real design but just can't afford it. Subs will be 4 e 12s on a cab 1600. Power and wires not a issue to feed it. Thanks guys

at 8 cubic feet net, i'd suggest not going any lower than 30 because you arent really gaining anything afterwards you are just throwing output in the garbage for literally no gains down low. If you want to tune to 28 you'll need to get up to 10-12 cubes for it to be worth it. If you are wired to 1 ohm then that 8 inch port is fine. if you are wired to half ohm, you'll need a bigger port, if you decide to go up in airspace then you'll need a bigger port as well.

 

[shredder1 10+ year member]

IDK what you want but I tried to change it up a little and the top line is 10 ft3 net tuned to 30 hz... the bottom is your 8 ft3 tuned to 28 hz... Opinions anyone?

 

[Papermaker85 5,000+ posts]

at 8 cubic feet net, i'd suggest not going any lower than 30 because you arent really gaining anything afterwards you are just throwing output in the garbage for literally no gains down low. If you want to tune to 28 you'll need to get up to 10-12 cubes for it to be worth it. If you are wired to 1 ohm then that 8 inch port is fine. if you are wired to half ohm, you'll need a bigger port, if you decide to go up in airspace then you'll need a bigger port as well.

i typically tune at resonance with a low Qe woofer and 5 HZ above with a high Q(.65 up) i personally tink anything lower than 32 her is like you said a double negative with the lower QTS

 

[Papermaker85 5,000+ posts]

IDK what you want but I tried to change it up a little and the top line is 10 ft3 net tuned to 30 hz... the bottom is your 8 ft3 tuned to 28 hz... Opinions anyone?

on the "design template" go the te "driver tab" and click voice coil temperature. enter 350 degrees..now click Advanced on the "box tab" click QL type in 8.

 

[Jeffdachef 5,000+ posts]

on the "design template" go the te "driver tab" and click voice coil temperature. enter 350 degrees..now click Advanced on the "box tab" click QL type in 8.

nothing changes after 211 degrees. as in if you enter in anything after 211, it treats the value as zero for this particular configuration.

 

[shredder1 10+ year member]

on the "design template" go the te "driver tab" and click voice coil temperature. enter 350 degrees..now click Advanced on the "box tab" click QL type in 8.

OK... I changed as you said and added another 10 ft3 net tuned to Fs

 

[shredder1 10+ year member]

nothing changes after 211 degrees. as in if you enter in anything after 211, it treats the value as zero for this particular configuration.

VC temp is 211 degrees now...

 

[Papermaker85 5,000+ posts]

10 cubes is too big. ill explain why.

the mass combined with the lower QES and CMS wall cause over excursion and lack of dampening issues. when you have a lower QMS you have more mechanical control over the moving parts so you can use a larger box to get gains around tuning and it won't unload as fast(above and below tuning) but when you combine it with low QES the box size becomes tricky because the driver is electrically(total QE) over-damped meaning it oscillates much easier with a given input. the lower QES means smaller box. while the low QMS means larger box. so its kinda a trade off. hence they recommend a smaller box. coupled that with a high MMS and alot of port area things great really tricky(you WANT port area because the port is acting like the diaphragm near tuning and that's where you want it LOUD) but its a fine line from having enought port area and hte proper QA(ports damning acoustically)

so basically you need to simply find the largest box with the largest port and lowest tune that doesn't completely screw up the dampening! lol

 

[shredder1 10+ year member]

10 cubes is too big. ill explain why.the mass combined with the lower QES and CMS wall cause over excursion and lack of dampening issues. whne you have a lower QMS you have more mechanical control over the moving parts so you can use a larger box to get gains around tuning and it won't unload as fast but when you combine it with low QES the box size becomes tricky because the driver is electrically(total QE) over-damped mean it ossilates much easier with a given input. the lower QES means smaller box. while the low QMS means larger box. so its kinda a trade off. hence they recommend a smaller box. coupled that with a high MMS and alot of port area things great really tricky(you WANT port area because the port is acting like the diaphragm near tuning and that's where you want it LOUD) but its a fine line from having enought port area and hte proper QA(ports damning acoustically)

so basically you need to simply find the largest box with the largest port and lowest tune that doesn't completely screw up the dampening! lol

Cool... I'm lust throwin' "curve" balls here and looking for input... LOL!.. Here are all 3 at 8 ft3 net with different tuning...

 

[shredder1 10+ year member]

I know general rule isn7-11 per cube for aeros. My box I'm planing will be 8 cubes with a 16" long 8" aero. That's 6.28 per cube. I want to tune to 28 just because I know what I like and that's my sweet spot. Will less port and low tune help me load better? I'd love to pay for a real design but just can't afford it. Subs will be 4 e 12s on a cab 1600. Power and wires not a issue to feed it. Thanks guys?

10 cubes is too big. ill explain why.the mass combined with the lower QES and CMS wall cause over excursion and lack of dampening issues. when you have a lower QMS you have more mechanical control over the moving parts so you can use a larger box to get gains around tuning and it won't unload as fast(above and below tuning) but when you combine it with low QES the box size becomes tricky because the driver is electrically(total QE) over-damped meaning it oscillates much easier with a given input. the lower QES means smaller box. while the low QMS means larger box. so its kinda a trade off. hence they recommend a smaller box. coupled that with a high MMS and alot of port area things great really tricky(you WANT port area because the port is acting like the diaphragm near tuning and that's where you want it LOUD) but its a fine line from having enought port area and hte proper QA(ports damning acoustically)

so basically you need to simply find the largest box with the largest port and lowest tune that doesn't completely screw up the dampening! lol

I guess I'm lost as how to find the proper port area for aeros... if I knew what velocity to look for when modeling I'd be a lot more comfortable... slots are 30 m/s... rounds and aeros are the same?...

 

[shredder1 10+ year member]

Add 37% or so to the slot velocity?.. I knew it was higher... just not how much...

https://www.stevemeadedesigns.com/board/topic/178548-flared-vs-non-flared-ports-an-experiment/

about 41-2 m/s?..

 

[BOOMINGRANDPA 5,000+ posts]

IDK what you want but I tried to change it up a little and the top line is 10 ft3 net tuned to 30 hz... the bottom is your 8 ft3 tuned to 28 hz... Opinions anyone?

wish i could get wins to work for me but after i got 2 subs to work hasn't since, don't matter how many times i try it won't take the Q's mms etc..

 

[shredder1 10+ year member]

wish i could get wins to work for me but after i got 2 subs to work hasn't since, don't matter how many times i try it won't take the Q's mms etc..

OK... well, good luck!