I purchased Zu Omen dirty weekend speakers about 4 years ago and am very happy with them.
When I ordered I was able to swap out the Omen 10" drivers for the Soul Superfly 10" drivers.
Zu did a great job since they installed a tweeter that matched the Superfly drivers better and upgraded the crossover for the same reason.
If you like deep bass you'll need a sub with them. Mine are very detailed.
Impedance is between 12 and 16 ohms so they are easy to drive.
I haven't tried them with any tube amps though.
When I ordered I was able to swap out the Omen 10" drivers for the Soul Superfly 10" drivers.
Zu did a great job since they installed a tweeter that matched the Superfly drivers better and upgraded the crossover for the same reason.
If you like deep bass you'll need a sub with them. Mine are very detailed.
Impedance is between 12 and 16 ohms so they are easy to drive.
I haven't tried them with any tube amps though.