Subwoofer insight.


This is new territory to me. Current speakers are 2 way with frequency response of 60Hz-20KHz with +/- 2dB.  Sensitivity rated as 86dB. Chance to purchase a pair of REL 7 tis. I feel like I am missing something but will have to buy the subs to try out. My basic question is this. Does this purchase sound wise? I know what I am willing to spend but do you think I will notice an appreciable improvement.  I know that no one can listen through my ears but this is my first time doing this. Source is 75 watt integrated tube amp, McIntosh MA-2275. Thoughts appreciated. I am leaning towards going forward with the deal but would appreciate some feedback. Room is large and open, 28X38 feet with 9 foot ceilings. Thanks for any feedback.
ricmci
I find most any subwoofer/s is better than none. 
Its thrilling when you realize how much low frequency information you've been missing. Similarly, when you discover the further improvements as a result of the proper room placement and calibration of the two subs or more.
Your in the mob now.
Two is a good start. Much better than one. Or none. One thing you will learn, if you're smart enough to try, is the more the better. One sub is better than none and sometimes kinda sorta matches. Two is better still. With four you find all of a sudden not only is the bass smoother faster deeper and more articulate, but it also blends seamlessly in a way that makes all the speakers disappear along with the room as you are enveloped in the sound field. 

So yeah, go for it. Great place to start.
Darn good idea.

Your existing speakers may sound great, however they are bass limited, and inefficient as you know.

1. a stereo pair of self powered subs is a very good idea, don't over do it. two, located near the mains, so the low bass and the overtones from those notes are directional.

2. removing the need for your existing amp to handle the bass is going to allow it to do a better job with your inefficient mains.

3. easy independent volume control/balance with the mains is nice, if buying new, remote vol of sub would be very nice.