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PR size for 4 inch woofer.
PR size for 4 inch woofer.
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Old 5th December 2019, 03:26 PM   #1
Sarthaksm is offline Sarthaksm  India
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Default PR size for 4 inch woofer.

Hello,
I took apart my old philips two way bass reflex speakers that has 20 watts 6 ohms 4 inch woofer. These woofers dont have a crazy amount of excursion but they sounded really very solid and pleasant in their stock enclosure. I am going to make a portable boombox and I will be adding passive radiators to keep things small. The only thing I can't finalise is PR'S size.
Some say to go for 4 inches and some say to go for 6.5 inches. I think going for a bigger PR would be better as these woofers were in quiet a big box for their size but still need some clarity on what would be a better decision or general rule of thumb.

Thank you.
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Old 5th December 2019, 06:46 PM   #2
scottjoplin is offline scottjoplin  Wales
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As a general rule the PRs should be capable of shifting twice the amount of air as the woofer, so, twice the area or twice the excursion
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Old 6th December 2019, 02:13 AM   #3
Sarthaksm is offline Sarthaksm  India
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Thanks Scott. I will be going with 6.5 inches and see what result comes out.
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