Gopher,
I don't recall which First Watt amp you have, but keep in mind that the Abby is an 8 ohm nominal impedance speaker, whereas Soul Superfly is 16 ohms. So you're -3db on power into the higher impedance at a given volume setting (though up 6db on power transfer efficiency). This combined with the somewhat incomplete break-in that sets in during shipping probably explains the extra volume rotation you're getting. The speaker will begin sounding more dynamic and subjectively a little louder for a given setting as break-in of the internal wiring and the cone/motor proceeds.
You'll also hear more detail emerge in the mid-band as the cone limbers up. Further, while the Soul doesn't have the floor gap fussiness of the Druid (which you now hear by getting real bass despite the speaker base sitting directly on carpet), installation of appropriate spikes will allow the Griewe model finger vents to properly function, and when the Griewe model is working properly, it affects sound right up through the mid-range. It's not just a bass performance feature.
Last, for now, if you really want max mid-range detail punch, borrow an 845 SET amp, or lacking that availability try any decent tube amp with 20w-60w of muscle. See how you like that compared to the First Watt. The only solid state amps I've heard give the Zu FRD the dynamic drive detailed shove of a jumpy tube amp are McIntosh autoformer output amps. You can get more jump factor and detail smack from tubes at a given budget than you can from transistors, if your ears are really hungry for smash-and-grab attention. But First Watt amps have specific sound assets and you'll hear them come through more vividly as break-in proceeds. Zu has told me in the past that the toughest break-in factor for speakers that go through factory break-in and aren't cold-weather shipped, is the internal cabling dialectric. Crank it when you can.
Phil
