Subwoofer with 2 channel stereo setup


My system is rapidly growing. I can't help it :)
The whole system now is integrated amp(DK Design MK1), turntable (Oracle Delphi MK 1), phone MC pre pre-amp and two speakers (ML Aerios i).
Now to finilize it I am thinking about getting a powered sub. The decent sub is another $2,000 investment.
I wonder if for-music-only-listening stereo (not for movie watching) it is A MUST upgrade? Does an introduction of subwoofer to a system will make a big difference?
Thanks!
sputniks
Sean,

I first noticed the improvement in transaparency, openness, and soundstage when I had been using KEF Reference 102/2s with a Velodyne HGS-10,; it seemed intuitive to limit the frequency range, given the small size of the 102/2s. When I substituted the much larger KEF Reference 104/2s, I decided to send the full frequency range to them. But when a Velodyne HGS-15 from a local source was delivered by an installer very familiar with high-end audio, he suggested I use Proceed's 80 Hz crossover even with the 104/2s. I was surprised to find the the same effect as with the smaller speakers.

The HGS-15 sits on an Auralex SubDude, and blends seamlessly with the KEFs. For movies and HDTV, surrounds are a pair of 102/2s with a KEF 200 C center speaker. The other pair of 102/2s and the HGS-10 have been moved to a secondary system, and provide good sound for the living room.

db
I suggest to audition and give it a try on your system.
Most of all trust your ears.

Just like you I was a skeptic unitl 2 days ago I brought home a Martin Logan Depth to demo with my Ascent of 2 years.

I opt for the Depth due to its size and ample performance of seamless matching my system. It is AWSOME....easy to set-up. Authorize dealer let me take their demo unit while mine is on order. My room is a 14x15x9. I listen to jazz, classical rock,and vocals. Hope this helps...