DIY Volume displaced by an internal Altec/WE 32 Horn?

[heartattackcity]

Does anyone know how much volume is displaced by mounting a 32 horn internally?

If one were to make a variant of the oft-referenced jelabs 2 way, but wanted to mount the horn internally and compensate for that displaced volume by increasing the size of the cabinet slightly?

If not I thought I might approximate by filling my 32 with water and dumping into a bucket to take an approximate calc.

 

[Wntrmute2]

I would buy a large plastic container- large enough to fully submerge the horn. Seal the openings with duct tape or similar. Fill the container with the horn inside (probably need someone to help you keep the horn fully immersed). Mark the level when fully submerged. Remove the horn. Measure the amount of water it takes to reach the marked level. Convert to liters. Easy.

 

[RPMac]

I would buy a large plastic container- large enough to fully submerge the horn. Seal the openings with duct tape or similar. Fill the container with the horn inside (probably need someone to help you keep the horn fully immersed). Mark the level when fully submerged. Remove the horn. Measure the amount of water it takes to reach the marked level. Convert to liters. Easy.

Remember, you have a driver that takes up space….I don’t think it will like the water.
I would add a cubic foot or two and call it a day.

 

[Wntrmute2]

That driver is basically a cylinder. Easy calculation.

 

[Audionut]

I no longer have my 32 horns or would pull out the tape measurer and abacus.
@Tsingtao_1903 may have already did the math on the volume displacement of said horn?

 

[gortnipper]

I no longer have my 32 horns or would pull out the tape measurer and abacus.
@Tsingtao_1903 may have already did the math on the volume displacement of said horn?

+1

I was typing @Tsingtao_1903 as you posted...

 

[MrEd]

I someone has one you can do one of two methods.
Brake it ( not literally ) up into small sections. Calculate thier sizes with little averaging and you can get pretty close.
Or you can seal off the openings and submerge in water and measure the displacement.
The 2nd method is very accurate, I used to measure piston domes that way, for compression ratio calculation.

 

[Tsingtao_1903]

From back of the flange, including 80X type driver. About 200 cubic inches.

 

[heartattackcity]

I just recently saw your modeling post and was wondering if there was a way to reach out. Thank you.

From back of the flange, including 80X type driver. About 200 cubic inches.

I just recently saw your modeling post and was wondering if there was a way to reach out. Thank you.

View attachment 69540

 

[heartattackcity]

For fans of basement empirical studies, and napkin math:

I didnt want to buy anything, but realized I had a tub that would fit everything to the back of the flange.
If we ignore the slightly tapered sides that allow the tubs to stack, the cross section is approximately 14.375" x 10.5".
The water displaced was almost exactly an inch, therefore just the horn was approximately displacing 151 cu in.

Trying to put that in perspective of a 612 cabinet with internal dimensions 24x17x28, cross sectional plan area of 408 sq in, adding 3/8" to the internal height adds 153 cubic inches, or 1/2" to add @Tsingtao_1903 's 200 cubic inches.

For the smaller 614 type cabinet with internal dimensions of 19.125x12.25x23, and a cross sectional plan area of 234 sq in, adding 5/8" adds 146 cubic inches, or 7/8" for 204 cubic inches with the driver.

Obviously correct me if my quick math is off, but thats a seemingly negligible difference in the overall aspect of the cabinet?

 

[heartattackcity]

Photos or it didn’t happen.

 

[heartattackcity]

Recent build, about to redo with 414’s for a friend.

Thank you.

 

[Tsingtao_1903]

just the horn was approximately displacing 151 cu in.

Love your napkin math. Without the driver, my model shows 155 cu in.

 

[manfredas370]

Sorry, don’t want to hijack topic, but I have question about how much volume is displaced by Altec/GPA 414. Anybody knows, or calculated?

 

[heartattackcity]

Sorry, don’t want to hijack topic, but I have question about how much volume is displaced by Altec/GPA 414. Anybody knows, or calculated?

I just got some, but I'm not dunking them.

 

[Tsingtao_1903]

Sorry, don’t want to hijack topic, but I have question about how much volume is displaced by Altec/GPA 414. Anybody knows, or calculated?

I don't have access to any 414's. Created a model based on published dimensions. Volume is 98 cu in..... should be close enough for government work.

 

[manfredas370]

Big thanks Tsingtao_1903 !!!

 

[Idler]

Will add these values to the 1968 Altec table:

 

[Tsingtao_1903]

Please dis-regard the volume in my post #16. Failed to take into account the internal volume of the cone. Closed it and recalculated. Volume is 212 cu in.