Need Help with New Design

[Jim P]

I was recently requested to provide the sound system for a good friend’s 50th birthday party. Since it is going to be held a local fire hall, I wanted to build something that can play respectively loud. Given a limited budget and time, I am planning on using some driver that I have on hand. My plan is to use the speakers below in an MTM configuration with the woofers wired in parallel.

AUDAX HT170JL28 6-1/2" JBL WOOFER 12 OHM
<A HREF="http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=299-434&CFID=11057999&CFTOKEN=30238618">http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=299-434&CFID=11057999&CFTOKEN=30238618</A>

EMINENCE APT-80 SUPER TWEETER
<A HREF="http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=290-532">http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=290-532</A>

The Eminence tweeter has a recommended crossover frequency of 3,500 Hz and an SPL of 105 dB. I am planning on adding an adjustable L-pad to the tweeter to allow me to adjust the tweeter level for the room response.

WinISD suggests that these woofers require a sealed closure of 147 l for optimum response, but decreasing the size has very little affect on the predicted response. For this project, I am planning either a 32 l sealed cabinet or possibly an OB design. The low end will be covered by two 12” Eminence woofers in their own cabinets.

Questions to the board:
Does my project sound feasible?
Would you build these OB or sealed?
What crossover frequency would you use?
What order crossover?

Thanks to all that take the time to reply.
Jim

[damkor]

> Does my project sound feasible?

Sounds OK.

> Would you build these OB or sealed?

Sealed.

> What crossover frequency would you use?

3500Hz. I would use the Eminence suggested Xover for the tweeter.

> What order crossover?

Just filter out that rise in the midbass.