Originally Posted by MKtheater
That is correct, 4x15 vs 1x12 with horn or not should be a no brainer.
To be clearer here, horns has it uses even though it is not the uber solution. The DTS-20 just has a lower working point of 18Hz, in HT that is probably its archille's heel for those chasing infrasonics. The Keith Yates design group has an add-on "turbocharger" of sorts done by DSL that enable the DTS-20 to dig down to 9Hz. It is just a matter of the design, not the driver. How many homes can accomodate that kind of size though? Esp with IB being a workable solution too for such sizes.
For horns choose 2 :
(1) size (size of horn)
There is no replacement for displacement, yes. Bass horns utilise acoustic gain to gain the displacement. Nothing magical here.
Your 3622N's 2418 uses the same acoustic gain giving you a very high efficiency. Same principle, the transducer inside does not need to move a lot and with little power to net the same SPLs.
I just changed out my Peerless HDS tweeter (highly recommended in the DIY circles) after using it for 3 weeks.....put back the Beyma CP380/M with DDS horn. It is so much more fun with the horn, and actually sounds more hifi, even at lower levels.
Of course there are lots of not so nice sounding horns out there.