Should I bother to try a subwoofer?


My speakers are listed as going down to 40 HZ (Dynaudio 1.3 MkII monitors).
There is an REL Strata III available locally that I might snag, try out and re-sell if I don't like/need it. My question is this: since I would not be using this for movies, do I even need this? I mostly listen to classical music, more chamber than symphonic, and occasionally listen to rock, jazz and other pop styles.

Am I likely missing something without that lowest octave? I'm thinking that 99% of the time the sub might not even be in use if it kicks in at 40 Hz.

Any comments, purely theoretical or from experience, will be welcome.
128x128tostadosunidos
Yeah...this subject seems to engender some weirdly snarky responses to what is a basic reality: Subs make the lower freqencies audible. Is that so wrong? Also there is something to be said for the imaging capabilities of small baffle speakers that don't have much bass combined with a good sub (like a REL) that can be a magic formula, without having to spend $97,000 on a pair of Rockports (speakers...not shoes).
When you listen to live music, the slam and attack that makes it "live and present" is sub driven.......why is it so wrong to try to have it at home?
I have found that the better the quality of the main speaker the greater the improvement with a sub in added ambience and low level resolution. The addition of the sound of the hall for classical music the greater the retrieval of very low level sounds. I also have Maggie 3.6r's that get well down into the 30's but sound better with a sub crossed over below 40 and volume set so you just barely notice that the sub is on
Very few speakers can do what a sub does. I have Ascendo ZF3s, which go quite deep, and powerfully. I still use Entec LF20 subs, crossed over very low (I think 30Hz). Very often, they are silent, but when called on by the music (organ or electronic, mostly), their contribution to musical enjoyment is significant. It seems like there is often little corelation between speakers' specified cutoff frequency and what I actually hear from the speaker. It is a rare speaker that doesn't benefit from a subwoofer.
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