Graham Holliman Velocity Coupled Infra Bass Speaker?

[abhihemu]

Originally Posted by bjorno

Ops, should be ~10 Hz

b

Hi b

just one more question ! what would be the diameter and the length of the Pvc port pipe ?

Thanks
Abhi

[bjorno]

Originally Posted by abhihemu

Hi b

just one more question ! what would be the diameter and the length of the Pvc port pipe ?

Thanks
Abhi

The internal port is L= 24 cm, Internal diameter = 10 cm.

b

[abhihemu]

Originally Posted by bjorno

The internal port is L= 24 cm, Internal diameter = 10 cm.

b

Hi b,

i am attaching the plan suggested by you.

Thanks
Abhi

[bjorno]

Originally Posted by abhihemu

Hi b,

i am attaching the plan suggested by you.

Thanks
Abhi

Hi Abhi,

Sorry, almost missed your answer...

You've got it right!

Note: The internal panel = 1B in your drawing has a thickness of 21 mm.. as I can see :If using 18 mm here too would not alter the performance of this box ..
You need also to internally brace the box ,random irregularly cross-bracing should work just fine.
I would spray-glue a~ 1/4" wool felt internally ,at least on the insides of the rear panels.. Covering all internal panels would too be a good idea as a lot of energy is transfered to the wood..
You really don't want to hear any localization cues from a sub like this one. I would definitively place this sub as close to a corner as possible.. with the driver and port preferably oriented close to the floor level.

b

[abhihemu]

Thanks b

I'll take care of bracings and be using glue at proper places..

Thanks
Abhi

[jblauvelt]

Really looking to see how this turns out!

[freddi]

excellent looking design Bjono!

[bjorno]

Originally Posted by freddi

excellent looking design Bjono!

Hi freddi,

Thank you freddie
I noticed that in post #307:Picture #1 is posted by a mistake.
Here is the correct one:

b