Sub: 1 large or 2 small drivers ? - Page 6

Bigun · 21st February 2009, 01:52 AM

Another worry,

With one speaker pointing out the front and one out the back - am I in danger of having the back wave reflect off the wall behind and canceling out the forward wave ? In essence do I have to worry about the two drivers sound field interacting ? (such that I have to orient drivers facing side to side instead of front to back)

planet10 · 21st February 2009, 05:57 AM

The wavelengths are too long... they don't exit and bounce, they ooze & flow... still i prefer to have them symetrically loaded. That is why i will orient the woofer so that it is "side" firing.

dave

Bigun · 21st February 2009, 10:46 PM

It's time for action now

I'm going to reduce the designed box volume a bit more and drop the drivers nearer the floor as suggested. Instead of a physical volume of 50L it will be built closer to 30L and then stuffed a bit to bring it to a Qtc of approx. 0.65. It seems to me that this will have a marginal impact on F3 or F10 and to my way of thinking - if I was going for the ultimate sub I wouldn't be using 8" drivers anyway.

Talking of which, the TRIO8 drivers and a 300W BASH amp are en-route from Bob (Creative Sound Solutions) and I'll pick up some Birch ply from HD tomorrow (or the day after).

21st February 2009, 01:52 AM	#51
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	Another worry, With one speaker pointing out the front and one out the back - am I in danger of having the back wave reflect off the wall behind and canceling out the forward wave ? In essence do I have to worry about the two drivers sound field interacting ? (such that I have to orient drivers facing side to side instead of front to back) __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

21st February 2009, 05:57 AM	#52
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	The wavelengths are too long... they don't exit and bounce, they ooze & flow... still i prefer to have them symetrically loaded. That is why i will orient the woofer so that it is "side" firing. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

21st February 2009, 10:46 PM	#53
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	It's time for action now I'm going to reduce the designed box volume a bit more and drop the drivers nearer the floor as suggested. Instead of a physical volume of 50L it will be built closer to 30L and then stuffed a bit to bring it to a Qtc of approx. 0.65. It seems to me that this will have a marginal impact on F3 or F10 and to my way of thinking - if I was going for the ultimate sub I wouldn't be using 8" drivers anyway. Talking of which, the TRIO8 drivers and a 300W BASH amp are en-route from Bob (Creative Sound Solutions) and I'll pick up some Birch ply from HD tomorrow (or the day after). __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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