Top notch speakers with their own sub

Two designs: (1) Zu Definition 2s (that I have and like a lot) and Zu Presence (that I have not heard) and (2) Rethm Saadhana (also that I have not heard).

Deqx powered systems from Salk, Selah, Lyngdorf and a few others are probably the current gen lineal descendants of the approach described by your Infinity Preludes. These are all actively crossed, multi-amped systems (the subwoofer amps are now BYO), and they now add digital room correction. Not precisely analogous to the Preludes, but these are probably the best for fit your "current technology" criterion that I know of.

Marty

I'd agree with the post which suggests separate subs to get the full-monty effect in specific rooms with various responses to low frequency sound waves. One of the finest effects I've heard in that respect has been the satellite sub system offered by Audiokinesis. This system offers seamless integration of subs in the most challenging of rooms, and the effect is astounding. The system is called the Planetarium System and is available in two forms.

The 3 BIG Montana Speakers, Master Reference, WAS2 and KAS2 all haver built in amplification for the subwoofers, check it out at pbnaudio.com

Peter

I certainly don't mind supplying amplifiers for various drivers including the subs. It's the seemless integration of the subs with other drivers to have coherent sound that I am worried about. Perhaps I'm wrong, but so far from the discussion, it comes across that the major speaker manufacturers don't get into system approach. In other word, you are on your own if you want to add sub-woofers into "standard" pair of speakers. This is for music listening, yet "standard" speakers don't have that abudance of a deep base sub-woofers can provide. Nor can you afford having the base coming from somewhere else but the primary speakers. At least with home theater, incoherance is more tolerable.