Two identical drivers in one enclosure: Implications

dumrum · 30th March 2004, 06:43 AM

Hello,
I have a question regarding the optimum number of drivers one can include in an enclosure.
I have designed an enclosure for my Woofer using the T/S parameters( Software - WinISD). The enclosure volume comes to around 2 ft^3 for optimum Gain response curve. It is tuned at 40 Hz. By the way, the intention here is to build a decent sounding Floor Stander/Bookshelf.
Now when I look at the SPL plot, it shows a max SPL of around 75db. Then I go ahead and increase the number of drivers to 2 in the same enclosre dimension. I see tha that the SPL plot has jumped to around 80 dB.
Hence my doubt here is whether there are other things to keep in mind while using two woofers of the same kind in the same enclosure.
Is it enough that I manipulate the tuning frequency to get a flat Gain response and maintain the higher SPL dB.
Will this work out for the better?
All responses welcome.
Thanks in advance,
Linoj.

Cal Weldon · 30th March 2004, 10:49 PM

Hi Linoj,

If you have designed your box for one woofer, that's what to put in it. To achieve your goals with two woofers, you double the size of the box.

Cal

Bill Fitzpatrick · 30th March 2004, 10:56 PM

75db is awfully low. What driver is it?

hunter audio · 31st March 2004, 08:14 AM

hi

most probably you are facing a phase shift problem

do you have access to an RTA ?

place a seperation baffle in between the enclosure housing each driver

mount each driver at the centre of its individual enclosure that is the rear air (behind the driver) should load the driver evenly

then place both ports at exactly the same positions , distance from the driver and the enclosure sides , in their individual enclosures

this should fix the problem some what

from here on a RTA is required to improve further

yet you will improve to about 85 db s at the max as 75 db s are too low to start with and i guess you are using Boltons

suranjan

transducer design engineer

30th March 2004, 06:43 AM	#1
dumrum diyAudio Member Join Date: Jan 2004 Location: India	Two identical drivers in one enclosure: Implications Hello, I have a question regarding the optimum number of drivers one can include in an enclosure. I have designed an enclosure for my Woofer using the T/S parameters( Software - WinISD). The enclosure volume comes to around 2 ft^3 for optimum Gain response curve. It is tuned at 40 Hz. By the way, the intention here is to build a decent sounding Floor Stander/Bookshelf. Now when I look at the SPL plot, it shows a max SPL of around 75db. Then I go ahead and increase the number of drivers to 2 in the same enclosre dimension. I see tha that the SPL plot has jumped to around 80 dB. Hence my doubt here is whether there are other things to keep in mind while using two woofers of the same kind in the same enclosure. Is it enough that I manipulate the tuning frequency to get a flat Gain response and maintain the higher SPL dB. Will this work out for the better? All responses welcome. Thanks in advance, Linoj.

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30th March 2004, 10:49 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi Linoj, If you have designed your box for one woofer, that's what to put in it. To achieve your goals with two woofers, you double the size of the box. Cal

30th March 2004, 10:56 PM	#3
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	75db is awfully low. What driver is it?

31st March 2004, 08:14 AM	#4
hunter audio diyAudio Member Join Date: Dec 2003 Location: calcutta	hi most probably you are facing a phase shift problem do you have access to an RTA ? place a seperation baffle in between the enclosure housing each driver mount each driver at the centre of its individual enclosure that is the rear air (behind the driver) should load the driver evenly then place both ports at exactly the same positions , distance from the driver and the enclosure sides , in their individual enclosures this should fix the problem some what from here on a RTA is required to improve further yet you will improve to about 85 db s at the max as 75 db s are too low to start with and i guess you are using Boltons suranjan transducer design engineer

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