Subwoofer

Lowest bass string frequency is 41.2Hz.  Lowest piano key is 27.5Hz, but it is seldom used.  My speakers go down to 30Hz.  I would spend money on the sub only for the "Movie Theater" special effects, but it is low priority for me.

jl35,
yes, that is my question...whether money is better spent on better speakers? I added dual JL Audio F110s and the JL Audio CR-1 crossover to my system. Adding the subs has opened my system up. Music has more detail, air, and a larger soundstage. I don't think spending 9K more on speakers would yield the same benefits, but I'm always open to opinions.

My speakers go down to 27 hz, but with the subs I'm hearing bass details that I've never heard before. My system is 2 channel only.

I think there's no question you will get deeper and better quality bass with a high quality sub and crossover...

At what frequency do you crossover ? If at or above 27hz you have the subs plus your speakers doing low bass duties ? I tried a sub crossed around 30 hz with some Thiels cs7's which go down to 23hz  and it sounded like they were competing with each other , was not clean sounding but i did not use an external crossover . I am unclear on what frequencies your speakers are handling . I would like to know how that gets setup . Seems like it would be beneficial if less taxing on amp/speaker relationship .