Douglas yee

Bill Fitzmaurice, so as long as I dont run the amp near full power with my cab set up as you stated I won't have to worry about damage to the amp itself?

So I received this spec sheet from Eminence. I may have to return the speaker for something else as it does not appear to handle to my amp power, (240W@8ohm 350W@4ohm) 101109A Re 4.10 Ohms fs 46.7 Hz Le 0.80 mH Mms 35.3 grams QM 11.95 QE 0.33 Cms 0.330 mm/N QT 0.33 Rms 0.866 N*sec/m Xmax 3.00 mm Vas 62.0 liters Pmax 150 Watts SD 366.1 cm^2 Bl 11.27 Tm Coil Diameter 2 Inches EBP 139.7 Gap Height 0.313 Inches Magnet Weight 38 ounces Efficiency 1.82 % Winding Width 0.550 inches SPL 94.6 dB 1W-1m Thanks for all the help everyone.

Stevie, you are correct in assuming I want to use what I have available. I'll ditch the smaller ports for the larger one you mentioned and see what up. I play bass for fun and had the cab that wasn't being used. Basically this cab is just for home play through so it will never be maxed out. I just needed it to sound good enough.

Sorry I am having a hard time finding data for the speaker. The speaker is NOS, from SWR factory close out I bought from a local builder. The speaker its self is 10" 8 ohm, 250 watt Eminence Megoliath. That's all I could find out for now. I went to the Eminence website but no info is available. I emailed their tech for a spec sheet but they are closed for a holiday today here in the US.

Sorry I didnt mention I will be replacing with a 10 or 12 bass speaker as well. The box will be closed up.

I'm repurposing a 1x12 open back guitar cab to bass cab and need help determining port tube size. Its a cab I built years ago and figured it would be an easy conversion.. The cab is all 3/4" Pine box, with 3/4" ply baffle and back. Interior volume and speaker displacement is 1.19 cu. Ft. or 33.2 l volume .079 cu. Ft or 2.25 l displacement I plan to use standard 2" port tubes for the conversion. Is there a formula to determine how many and what length the ports should be or does it matter that much at all? Thanks for the assistance.