CarterKraft wrote: ↑Tue Oct 27, 2020 4:57 pm
Ideally I was looking to create a cabinet the same size as the DB XL2, a friend just bought one against my suggestion and I would like to show him what a DIY system is capable of. The Tuba/SLAPRO hybrid is a fair bit bigger than the DB XL2 and the T39 sounds like it will be even larger. On paper it looks to be getting too large to be portable (easily). I think the Is the absolute biggest it can be.
The Alpha 6 drivers come in a sealed back version and it occurred to me the Tuba could be made wider and allow the woofers and tweeters to be in the throat of the horn, I have no idea if this is a good idea or not though? This would allow the Tuba to be the full width of 12" and 10" loaded vs the 8" I prototyped.
It will definitely need to be battery powered, I planned on using the D Class amps from parts express in the 2.1 200w/100w flavor but as drivers and designs change that may need to change as well.
From a volume (size) standpoint, a 24"Tx36"Wx12"D TruckTuba is 6 cubic feet.
A minimum width (13") T39 loaded with a 10 is 5.7 cubic feet, a little less
And a minimum width (15")T39 loaded with a 12 is 6.6 cubic feet, a little more
So, all three of them are roughly in the same ballpark, overall size wise. However, if you determine that some of the dimensions just wont work, then that's just the way it is.
Bill will have to speak to the sealed-back Alpha's. IIRC, I think he actually has some he's selling as well as Alphalite6 CBMR's at a decent savings,
here.
I'm pretty sure if your plan is to stand it on end, you're gonna want the horn mouth pointed at the ground and will need to elevate it a bit... perhaps on a separate stand or built-in legs... which would alter the overall dimensions some.
In either case, I think you'll have an easier time transporting and getting the sound coverage you'll want (by being able to mount them higher on stands) if you build the tops as separate units. But, I think I'm understanding that might not be the image you have in your mind about this project. Could always be a project in the making and progress through different stages as you learn what works for you and what doesn't.
Have you researched what you want to use as batteries to power it all? My mind automatically goes to a deep cycle marine/automotive for something like that. But, they're heavy. Then there's the 12v Sealed Lead Acid batteries they put in Power Wheels and Computer UPS power supplies. But, they are current limited and only store 7-8Ah. So, attaining peak wattage could possibly be a concern as well as usable play time. Or, maybe make your own power pack with protected 18650 cells? Enough of those would be fairly light and depending how many series runs you have, would cover the peak amp draw... but it would require a butt-load to get the storage capacity for extended play time at higher volumes.
What does that other unit use for a battery/ies?
