Need advice on an 18" driver

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Guys, I got my hands on a nice pair of 225 liter (8 ft3) speaker boxes with a cut out for 18" speaker, braces and all. There are also 2x4" vents in each box. I need your advice as to what inexpensive 18" driver would work reasonably well in these boxes. These subs are for a small club in LA area where they still play classical music every Wednesday night.
 
Guys, I got my hands on a nice pair of 225 liter (8 ft3) speaker boxes with a cut out for 18" speaker, braces and all. There are also 2x4" vents in each box. I need your advice as to what inexpensive 18" driver would work reasonably well in these boxes. These subs are for a small club in LA area where they still play classical music every Wednesday night.

Define "inexpensive"...

The box volume seems right for the B&C 18TBX100, which goes for about $290 a pop, and you'll get into the low 30's if the box is tuned right.

How long are those 4" vents?
 
Define "inexpensive"...

The box volume seems right for the B&C 18TBX100, which goes for about $290 a pop, and you'll get into the low 30's if the box is tuned right.

How long are those 4" vents?

$290! Ouch! I was trying to help the club and undertook to build a system for them. I'm already out of $300 for the top end (511 Altec horns with 802 compression drivers), about the same for 100-500Hz midrange. I was hoping to complete the entire project for under a grand. Me thinks that the length of the vents can be easily adjusted.
 
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HI All,

FYI:225Liter BR using Eminence SigmaPro-18A:

b🙂
 

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