Hi all,
It's good to see this thread up and running again. I thought I had contributed to the old one but might not have/ might have missed my words above.
I have built two speakers: one a tuned port 1x15 using an EV speaker (beta I think as it was cheap) and a 1x12 vented built to match the size of my combo so that my combo could sit on top. Both work well but could do with better drivers. They were built when I wanted better/ extra speakers at little cost. They both met those requirements with room to spare. They enabled me to turn my 1x12 75W combo firstly into 100W 1x12 plus 1x12 extension and then with a cheap 100W power amp I was given they became a 100W 1x12 plus 1x12 with a 100W 1x15. So much better than the original 75 W.
I used WEM plans and took the 1x15 up to Charlie's house for him to check out. A really interesting guy with many stories to tell. Cost of the 1x15 was about £100 ( it will handle 300W at 8ohm) and I built it freehand i.e. without a vice to hold the wood. It still came out square and is properly sealed. The theory of the tuned port fascinated me. I like motorbikes and knew a fair bit about tuned exhausts on the old racing two strokes and the tuned pipe on a bass cab works in a similar way. All to do with stading waves set up in the pipe reinforcing the speaker movement a a particular (resonant) frequency.
Not sure what to build next as I chickened out and bought my last two cabs. I quite like the iedea of a sealed 2x12in cab to use in conjunction with my 1x15. The problem I have is the impedence of the drivers. I need either 4ohm or 16ohm drivers which seem hard to find at a sensible price in 12 inch. Alternatively an active, wedge floor monitor using the 100w power amp could be good.
Geejay