Originally Posted by 2100
Lets not talk about used products...but are high power amps very cheap? Say I have an Acoupower be it sealed or with PR. Is there any cheap 4KW amp bridged? In dynamic HT/music power compression should be non-issue with such a driver.
Maybe there are other products but this is one which i am familar with.http://www.danleysoundlabs.com/pdf/T...ec%20Sheet.PDF
Anybody in the know, perhaps may let me know of any small/box with PR/port assistance (whatever) that has this or near this kinda efficiency and SPL capability? Say Lambda TD15X w/PR.
No need to dig very low, as show here with 28Hz which is fine with music.
First, the whole reason that thing has an efficiency of 102dB is because it's a tapped horn covering a very narrow frequency range. With modern amps theirs no need for that kind of efficiency and no, you don't need 4kW either. That thing is designed for Pro touring and really has no relevancy to the home theater DIY market unless you're just experimenting for the fun of it. In these forums you will find people running multiple drivers in rooms small enough that you will pick up room gain and have high efficiencies across multiple octaves. People here routinely go from 80Hz down to 10Hz and even lower. If they have extreme desires for lots of bass they may be running maybe a couple of Behringer Ep2500's with 2400 watts (bridged mono) but at $350 a piece they're not spending a fortune on the amplification side a nor do they need to.
Originally Posted by 2100
But then I guess in the US of A with 110V service, getting 4KW output means a 50A line?. (is there such a thing even if you can pay?)
You don't need 4000 watts of continuous power, that's peak power and comes from the capacitor banks on the amp. The EP2500 for example will draw less than 10 amps at 120 VAC, which even if the thing was 100% efficient is still less than half it's rated output. But yes, you can get a 50amp line, I have one running to my Hot Tub... :-)
I think you need to tell us why you're looking at tapped horns? Is it just for fun or do you have a real application for a sub woofer that you are trying to find a solution for? If it's the latter I'd suggest you take a step back and figure out what you really need for in room response and then go find a bass reproduction technology that matches those needs; I personally wouldn't expect it to be a tapped horn...
Since you mention the Acoupower driver spend some time on their web site. For example their article on Redfining the club subwoofer
addresses the issues of a conventional horn versus a bandpass box. This is not exactly my favorite design either (and interestingly enough shares some design ideas with the tapped horn in a way) but probably makes sense in this application. The result is a smaller box, better extension and higher SPLs! The other article on the site: Pro audio example B
talks about how they achieve 100dB with just 1W total input power.
One final comment, personally I wouldn't be spending my money on the Acuopower for home use. I'd consider it overkill, but that's a whole 'nother disucssion.