Tang Band 5.25" Subwoofer

[speedracerx 10+ year member]

I saw these Tang Band W5-1138SM 5-1/4" Neodymium Subwoofers on clearance at Parts Express for under $20. Their 9.25mm X max interests me. I can enclose the bottom of the doors (30x8x5) in my 71 Chevy truck and was thinking of putting 1 or 2 in each door sealed in glass. I was originally wanting to do 1 each with another set of Extremis in their newer 4ohm version, but for $20 ea. are these worth playing with?

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[speedracerx 10+ year member]

Would building glass enclosure in door for total seal be worth effort?

 

[speedracerx 10+ year member]

Or porting 6.5 driver like this?