These are not negative comments as they don't directly relate to performance but just some corrections of the early technical description which were perhaps a bit of marketing. A 1st order butterworth filter needs few components and has lots of band overlap. Finding space for it is no more problematic than other crossover designs and in fact is a common approach. Butterworth generally relates to higher order networks since 1st order types are generally all the same and have great phase character. They are simple and in this case, simple can be good. Not simple to voice but simple in execution.
I think it's a fine choice for this purpose and lobing in this instance is a non issue. If they can keep the group delay reasonable it should all work great. It's just that the crossover type and packing aspects aren't unique. It will come down to driver alignment and execution which looks to be great. It will be interesting to see the phase curve once measured to see if it's a flat phase response from end to end. Not nearly as important as the drivers being so in the overlap regions which is over 6 octaves depending on individual driver response and any added mechanical filters.
All that said, I appreciate Headphone addicts reviews and the heads up on something that looks to be a contender.
Edited by goodvibes - 2/5/14 at 7:35am