midbass enclosure volume

[omni]

I've got a pair of SEAS CA15RLY midbasses to use for a 3 way, crossed over at about 250-300 Hz, low end, and am looking for advice on what size enclosure to use. I want it to be sealed, and it will be crossed over at 2500-3000 Hz top end. Do I shoot for a Qtc of .5, or what ? I got Zaph's TS parameters from his latest test posting and plugged them into WinISD, so I have the ability to model a box. I am looking for input from this forum. Also, I have done alot of research on crossover design, mainly in Dickasons cookbook. Other DIYers talk about crossovers with different slopes per driver in a 3 way, but Dickasons cookbook topologies and formulas don't discuss that. Do I take the formulas from his 2nd order equations for one driver, then use 3rd order formulas for another driver, etc. and put them together, or what. I will be doing impedance measurements and corrections prior to calculating parts values......Please help with these issues, any input will be greatly appreciated......Respectfully...omni

[Tenson]

To get the crossover right you NEED measurement equipment such as a computer, soundcard, microphone and ETF.

You need to get the 'acoustic output' of the drivers to crossover smoothly, so you can't just use a standard electrical crossover without measuring the drivers actual sound output.