tubemax Messages: 37 Registered: February 2012 Location: Netherlands
Baron
Thanks Wayne,
I was actually trying to find port tube with 2,5 inch INSIDE diameter but could not find any, all of them where 2,5 inch outside - not what your design demand, so went ahead and bite the bullet with drilling... it came out ok.
Another question, how well 3 Pi works with high power transistor amp's, for example crown XLI or XLS series ( AB & class D )?
Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
I love Crown amps and have a couple of them myself. I prefer the older Class AB amps to the Class D amps, but I'll bet if I was lugging them around for gigs I might change my mind. But they're great for all-out SPL, and your speakers will love them.
About the port, the truth is the 2.5" O.D. tube would have worked just fine. The difference from the slight change of Helmholtz frequency is minor - Much less than the fluctuation you'll see from the shifting electro-mechanical parameters as voice coil temperature changes at various power levels. I design all my speakers with a wide margin of tolerance for this kind of shift.
tubemax Messages: 37 Registered: February 2012 Location: Netherlands
Baron
Good to know that speakers like higher power amps as I'm not anymore into low power tube amps as before, I should have asked about port tolerances earlier - it would have saved me some time... going back to gluing process...
tubemax Messages: 37 Registered: February 2012 Location: Netherlands
Baron
Well, another week passed and I did so little but somehow succeeded to put together both enclosures and now I can start with placing damping material and do something about the looks... work in progress...
tubemax Messages: 37 Registered: February 2012 Location: Netherlands
Baron
Getting even closer but not yet done...
I decided to use the vinyl to wrap the speakers, also painted the back side and I'm just about to start with front side but my back started to hurt - the more material goes in to the box - the heavier it feels. need to rest for few days...
tubemax Messages: 37 Registered: February 2012 Location: Netherlands
Baron
Hi Everybody,
Well after some pause, the work has been resumed, so far speakers are 99% ready and just waiting to install glass wool any day from now.
I did spend a lot of time in making those speaker grills, it's a tricky work and require a lot of patience if you want to achieve neat looking and tight grills!
Speaker raisers/stands are done as well, they are just there to help raise the woofer to a visible line with the listening position without any obstruction and are slightly angled as well. Total height is about 5 inch on the front side.
Stay tuned in for a couple of days for the first test...
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