Klipsch Heresy IV

Yep what that guy is saying about efficiency in the video makes sense.  You can't get more bass out of essentially the same size package without losing some efficiency so the I would tend to lean towards IIIs with lower power amps.

I heard IVs with a beefy Anthem solid state amp and that was a very good combo.

If you want flat extended bass off a few watts you need big speakers.  No way around that.  It's the laws of Physics.

For those who will wait, these great speakers will be for sale on eBay and Craigs list soon!

I heard them last week.   Agree with what SteveHuff & others have said.   Lively without any hint of harshness.  Natural sound, very nice.

Seriously considering buying a pair.

I agree, they are amazing!  (My setup : Bluesound Node 2i --> Chord Mojo --> Exposure 3010s2 --> Heresy IV / SVS SB-3000)

https://youtu.be/-Eyb7ZnFUQM

Interesting link as posted above.   I’d really like to hear them side by side for myself.   I’ve never heard a speaker that couldn’t be improved by a Sub.  I’ll never be without.   So I’m wondering if I’d be better to save my money & pick up an old pair of Mk2.