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Old 9th April 2012, 03:13 PM   #31
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Hi Tom,
Dave's mentioned 16 litres, I'm suggesting up to 20 but don't be put off any experimentation. Have you got some facility in Singapore to make simple boxes, or get them made locally?
Thanks
Mark.
Well that's a bit the complexity, back in Belgium it would be easy enough.
I was just googling for local MDF suppliers hoping to find one that can cut everything to measure, including round holes. Then to build and finish them in an apartment is not that evident either!
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Old 9th April 2012, 03:19 PM   #32
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Originally Posted by talaerts View Post
Well that's a bit the complexity, back in Belgium it would be easy enough.
I was just googling for local MDF suppliers hoping to find one that can cut everything to measure, including round holes. Then to build and finish them in an apartment is not that evident either!
There should be wood, timber and MFD suppliers in Singapore. Usually these companies are supplying all the fit-outs for apartment and commercial buildings. Your idea of making simple experimental boxes is a good way to go. If you then decide on nicely finished ply boxes, I can put you in Touch with Tony Wong. Or dave and Chris in Canada might be willing to ship out a made-up design.

Cheers
Mark.
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Old 9th April 2012, 03:20 PM   #33
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SuperPensil users should have less work (my guess).

dave
Oooh! Nice! That'd be great to be able to get a new set of drivers for my existing boxes and only have to play with dampening

Scott
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Old 9th April 2012, 04:43 PM   #34
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See my last post. They should work acceptably, but they will produce less gain.
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Old 9th April 2012, 04:52 PM   #35
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Hi Scott,
Many thanks for the suggestions, much welcomed.

From last Friday's run in the existing Pensil 12 boxes, I'll be taking out some internal damping this Saturday at the second listening event.

I'm pretty certain a bigger Pensil is the way to go, but those guys who want to retro fit into existing Pensil 12's , it still sound OK if a tad light on the bass.

Cheers
Mark.
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See my last post. They should work acceptably, but they will produce less gain.


hmm, sounds like Hoffman could've had a point?

pick 2 of 3
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Old 9th April 2012, 05:15 PM   #36
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so...If i understand correctly, the super pencil would be the way to go?
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Old 9th April 2012, 05:18 PM   #37
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so...If i understand correctly, the super pencil would be the way to go?
Isn't bigger ALWAYS better I have the Super's so I'm a bit partial to them.

Scott
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Old 9th April 2012, 05:22 PM   #38
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would I be going too far ahead to start building the cabs for the super pencil while awaiting these new 12.2p's?
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Old 9th April 2012, 06:01 PM   #39
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Click the image to open in full size.

30 l tuned to 55hz
vent diameter 10.27cm, vent length 19.47 cm

....

Comments?
Tom,

That curve violates my zero crossing critria, so i'd never go there.

The rule is intended to maintain bass quality over quantity in a reflex box.

dave
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Old 9th April 2012, 06:35 PM   #40
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Tom,

That curve violates my zero crossing critria, so i'd never go there.

The rule is intended to maintain bass quality over quantity in a reflex box.

dave
I've not been exposed directly to this concept: is it where the any two tangents of the curve cannot cross beneath the curve?

ie, dy/dx > 0 below the rolloff frequency.
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