I have owned speakers of all types Including Zu and Lawther
Both are very respectable .one speaker that IMO is totally different is the New Omega Alnico- 6. Loudspeaker. The cabinet is super critical even more so in a single driver Loudspeaker. 4 seperate sandwich layers used in this speaker. A soft Birch ply core,then 2 ply cores then the outer veneer that is the thickest I have seen .which is a Antique grade almost 1/16 th thick.as good or better then Salk speakers cabinets which are very good.
Then ported.the Hemp fiber cone is one of the strongest ,and still very light.
Sonicly it has a very natural top end not rolled off at all ,and the midrange
Very open with good image depth.one thing that you don't expect is the midbass.it has excellent punch ,and Bass into the mid 40 HZ region. 93 db efficient. Using this Jas Bravo 18 wpc- SET integrated it sounds like a live performance . A great combination .this is one Loudspeaker that the better the equipment the more refined the performance and they can Rock.