Infinity SM82 (or SM80) 2-Way Loudspeaker Rebuild
Posted: Wed Apr 11, 2012 6:40 am
I re-did the foam surrounds on my woofers last year and wasn't pleased with the results. So I've been meaning to re-use the cabs and maybe some of the crossover parts. Ultimately, I chose this woofer and tweeter:
Dayton DS215-8
Dayton DC28F-8
Port Tube rec'd by Parts Express
The woofer and tweeter were picked for their cabinet suitability and matching together. The woofer in particular looks perfect for this cab. Also, I *think* I won't need to do any wood cuts for them. The port tube will require the old port tube hole to be enlarged by a 1/4", so I'll use a jig saw for that. Using WinISD everything confirms the Parts Express specs, with the port tube length at 4". The original crossovers were a 2nd order LR. I will switch to a 1st order Butterworth. I have my 10uF Sprague 730P caps and some 600uH inductors to use for that. I'll probably adjust those for 2500Hz.
Parts Express had the parts to me in record time. I ordered on Sunday afternoon and got them at 9am Tuesday morning - love it! I will do the upgrade this coming weekend. Meanwhile I am experimenting with speaker sweeps with my RS digital SPL meter and my Boonton. I'm getting some useful data with a simple setup, only getting too many resonances from the room. Hopefully the wind will die down and I can sweep these in my yard facing up from the grass. I think I should be able to get decent tests that way for comparison before and after the upgrade.
Shannon
Dayton DS215-8
Dayton DC28F-8
Port Tube rec'd by Parts Express
The woofer and tweeter were picked for their cabinet suitability and matching together. The woofer in particular looks perfect for this cab. Also, I *think* I won't need to do any wood cuts for them. The port tube will require the old port tube hole to be enlarged by a 1/4", so I'll use a jig saw for that. Using WinISD everything confirms the Parts Express specs, with the port tube length at 4". The original crossovers were a 2nd order LR. I will switch to a 1st order Butterworth. I have my 10uF Sprague 730P caps and some 600uH inductors to use for that. I'll probably adjust those for 2500Hz.
Parts Express had the parts to me in record time. I ordered on Sunday afternoon and got them at 9am Tuesday morning - love it! I will do the upgrade this coming weekend. Meanwhile I am experimenting with speaker sweeps with my RS digital SPL meter and my Boonton. I'm getting some useful data with a simple setup, only getting too many resonances from the room. Hopefully the wind will die down and I can sweep these in my yard facing up from the grass. I think I should be able to get decent tests that way for comparison before and after the upgrade.
Shannon