>>...can I trouble you for a summary of what you're currently finding as the Def4s unwind (btw how fast does the sound open up, how many hours before they'll give of their best?)<<
I've had my Def4s eight weeks. Prior experience with new Definitions has been that I'll notice improvements for months, maybe as far as eight to ten months from installation. But in this case I'll say that the tonal completeness has arrived much more quickly than prior new Zu speakers. Now it's a matter of how much more bloom and dynamic ease materializes, and I expect the LAB-12 sub to climb in output steadily, requiring trim to the sub amp's level. The Radian sounded smooth from the start. My specific speakers did have the benefit of additional use at CES (with my consent) before they were delivered to me. If you take delivery when shipping from cold Utah to a cold destination, break-in can take considerably longer. No matter how much factory break-in, cold weather shipping seems to set back the clock on new speakers. Mine were delivered to Los Angeles, via Las Vegas.
>>the greater spectrum of frequencies covered by the new nano impregnated FRDs; they seem to extend deeper into the bass and higher into the treble<<
I didn't actually claim this and if I wrote something that led you to believe I did, then let me correct the misperception, and be more precise: The nano driver actually does have the potential to go higher than the traditional Zu supertweeter roll-in point at 12.5kHz, but that hinge point isn't changed on Def4. But the articulation of the whizzer is certainly greater and more refined. Then the Radian takes over above the FRD's whizzer and it's much smoother, more nuanced, more beautiful and dispersive than the old Zu supertweet. All over, the nano driver is faster, more revealing. more agile. On the bottom end it's different in that you can now adjust the hinge frequency for the low pass filter on the 12" sub, and in part this is feasible because the FRD is capable of a bit more low range than before. Centrally, however, the Zu nano FRD is covering essentially the same acoustic range in Def4 as in Def2, but the sub and super complements are seriously upgraded.
Def4s will probably give their very best in about eight months, but unlike earlier Defs, you'll feel like you're just about there within a couple of weeks of daily use, and maybe as soon as 3 or 4 days depending on whether your speakers have taken an extended cold weather trip. But I'm only 8 weeks in, so I'll let you know if a lot of concealed potential unexpectedly emerges over the next several months.
Phil
I've had my Def4s eight weeks. Prior experience with new Definitions has been that I'll notice improvements for months, maybe as far as eight to ten months from installation. But in this case I'll say that the tonal completeness has arrived much more quickly than prior new Zu speakers. Now it's a matter of how much more bloom and dynamic ease materializes, and I expect the LAB-12 sub to climb in output steadily, requiring trim to the sub amp's level. The Radian sounded smooth from the start. My specific speakers did have the benefit of additional use at CES (with my consent) before they were delivered to me. If you take delivery when shipping from cold Utah to a cold destination, break-in can take considerably longer. No matter how much factory break-in, cold weather shipping seems to set back the clock on new speakers. Mine were delivered to Los Angeles, via Las Vegas.
>>the greater spectrum of frequencies covered by the new nano impregnated FRDs; they seem to extend deeper into the bass and higher into the treble<<
I didn't actually claim this and if I wrote something that led you to believe I did, then let me correct the misperception, and be more precise: The nano driver actually does have the potential to go higher than the traditional Zu supertweeter roll-in point at 12.5kHz, but that hinge point isn't changed on Def4. But the articulation of the whizzer is certainly greater and more refined. Then the Radian takes over above the FRD's whizzer and it's much smoother, more nuanced, more beautiful and dispersive than the old Zu supertweet. All over, the nano driver is faster, more revealing. more agile. On the bottom end it's different in that you can now adjust the hinge frequency for the low pass filter on the 12" sub, and in part this is feasible because the FRD is capable of a bit more low range than before. Centrally, however, the Zu nano FRD is covering essentially the same acoustic range in Def4 as in Def2, but the sub and super complements are seriously upgraded.
Def4s will probably give their very best in about eight months, but unlike earlier Defs, you'll feel like you're just about there within a couple of weeks of daily use, and maybe as soon as 3 or 4 days depending on whether your speakers have taken an extended cold weather trip. But I'm only 8 weeks in, so I'll let you know if a lot of concealed potential unexpectedly emerges over the next several months.
Phil