Speaker halp

[zman01]

IIRC in one of the threads GM suggested a ~30 liter box tuned to 42Hz using EBS alignment for the A12P:

http://www.diyaudio.com/forums/full-range/229852-alpair-12-2p-modeling-help.html

 

[needtubes]

Makes me wonder then if I missed something in unibox or it's not accurate.

Could be a difference in scaling of output images coupled with the fact that the WinISD model likely does not account for stuffing the box or lining the walls, while your Unibox model likely does.

 

[beaner]

IIRC in one of the threads GM suggested a ~30 liter box tuned to 42Hz using EBS alignment for the A12P:

http://www.diyaudio.com/forums/full-range/229852-alpair-12-2p-modeling-help.html

You know that's not bad at all. That mid 40's looks just fine to me, if I need deeper I still have an old late 90's paradigm 8 sub I could toss on. Unless I rip it apart steal the amp and make something that could go lower.

 

[Scottmoose]

They will not have deep bass. The sims in WinISD are born out in real live. These drivers need to be in a big box (MLTL) to get down. In a 20L BR box (tuned to 58Hz), F3 is about 59Hz, with F10 @ ~45Hz. You'd need to augment the bottom end with a small sub or two.

jeff

I designed them to have useable output down to the mid-40s under practical conditions in smaller - modest spaces with a lightly damped alignment.

Unibox and WinISD are both quite accurate if you know how to get the best from them. Some differences in the vent calculations which usually get swamped out in practice.

 

[vinylkid58]

Well I may have to eat my words (somewhat) now, as I've added 3ohms SR as you suggested in the other thread, and got a quite respectable looking curve. So at 35L tuned to 43Hz EBS-3db with the added SR we get F3@44, and F10@34-ish. We've lost a couple db's efficiency thou.

jeff

 

[chrisb]

that's on paper, Jeff - have you built / listened to them yet?

 

[zman01]

that's on paper, Jeff - have you built / listened to them yet?

Chris,

Worth a trial?

Jeff has the drivers, you have the wood and the skills...

 

[chrisb]

Time is far more expensive than materials for us old farts these days, and the space to store all these experimental builds is getting tight - but I'm game to share the costs - might mean a pie or two, though.

 

[vinylkid58]

C'mon Chris, you know the sims are always right. Maybe we should ask the OP in the other thread what happened to the build.

jeff