I had a HAZ in my solid maple NS4 with EMG-DC. It was too bright and hard to dial much in that needed. I had the treble cut fully and switched to nickel strings to smooth it out.
What I have now is very versatile, but hard to keep everything in balance. I just need a little less boominess on the bottom.
I have three NS4s with an 18 volt Haz set up. They are all constructed differently. And set up differently. They all have their tonal quirks, but seem to be very wide ranged with tons of control. None have sweet spots I need to be aware of, just real differences that can be a real plus, when playing.
* 2002 NS4 (Curly Maple) fretted round wound Optima Gold Unique strings. Regular DC 35 EMG pups. Killer sound, quite punchy, and maybe the louder of the pack.
* 2010 NS4 Special Edition (only two were ever made) - Fretted Wenge Neck, Redwood Cap on Black walnut, Regular DC 35 EMG pups, with Roto Nexus roundwound strings, killer sound, a little more low end presence, but still real punchy. Not quite as loud as the 2002. Remember a lot of this can be the walnut with redwood cap, or even the special Wenge neck, which is in a class of its own. BTW, Wenge fretboard too.
* 2017 NS4 (Curly Maple), Frettless, La-Bella Purple Haze tape wound strings, New EMG x series Pups, it is far more mellow, but still a super wide range freq. response. No boominess. But certainly not as loud as the other two. But she is a great player and can go from almost an upright sound, to a fretted sound (albeit more of a flat wound because of the strings). Her arched frettless frett-board is incredible. 1st of all I was surprised at the sound of the EMG X series pups. More than I could have ever wanted with the older EMG DC 35s. But maybe the newer HAZ may also be a contributor. Never thought of that.
All I can say is, they are all super versatile. But the 2017 baby is incredible in her control and range of adjustment with any amp I have put her through. I have not noticed any sweet spots that I need to hit, only complete control of my needs.
BTW my treble setting on all of these bases usually set real close to the mid point indent. Sometimes on certain songs I roll up only a slight increase. Bass setting is usually close to the same, slightly above the mid point indent. Every once in a while it may get rolled to almost 3/4 setting up. But I have real good equipment for my amps. And take pride in that. Usually using a Genzler MG 800 head with a dual 12" Schroeder cabinet, and a single 12" Schroeder Cabinet.