Subwoofer to mate with Casta model C's.......

Since budget isn't an issue there are now a growing selection of manufactures that offer internal calibration and/or equalization which usually makes integrating with the main speakers a matter of infinite personal taste or at the very least a simple automatic no brainer.

Personally, I went from a large 18" to two 12" subs and found the room interaction much more to my liking not to mention they're much easier to locate. On the other hand I find Larry Greenhill's Stereophile reviews and description of large subwoofer systems intriguing and in the case of my old 18" sub very accurate if you're so inclined.

My subs have remote control of most of their functions which makes individual recording adjustments from the listening position a snap. Sometimes a recording could use a little more or a little less low frequency volume and occasionally a different EQ setting which have been preset.

I found it very helpful that the internal calibration offer both auto and manual settings as well as a visual graphic interface with a computer or a video display. In my previous home I found that I had the need for high pass filtering of my main speakers which my subs offer. The conditions of the current room allow running the mains full range.

Good room and mains integration is actually quite subtle and is usually only noticeable when the extra low frequency system is turned off. In hindsight I would have chosen two 10" subs for my 15'X28'X8' room.

05-06-15 Bacardi "@M-db, do you think running the subs speaker connectors to the speakers allows for better blending with the mains?"

I apologize, my statement is misleading. I used my Velodyne DD Plus' line level High Pass filtered output to accommodate the use of a much lower powered stereo amplifier while one of the mono-blocks was being serviced. This line level high pass method is usually tried when accommodating small satellite speakers to achieve a smoother response.

Are you considering the speaker/high level connectivity method used by REL? I found my short time with a Studio III and this method of connectivity limiting in some important areas. I was able to improve the subs performance somewhat by using an equalized line level signal from my then, DD-18.

Keep in mind my criticizing subwoofer performance with the staggering room variables that confront producing extra low frequency playback can be quite worthless. I do feel strongly regarding the value of ever improving subwoofer equalization and the ability to remotely control deep bass.

If your goal is large air then you might want to expand your search outside the Hi-Fi community to Danley Sound Labs and Meyer Sound. Good luck with your search.