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
Adding a Rel sub to a pair of Kef LS50s was one of my better decisions. The sub filled in the bottom end and increased the soundstage (depth, in particular). The little Kefs no longer sounded small. Would like to add another sub but room layout is very limiting.  
FWIW - I’m running a pair of SVS SB1000 subs alongside Totem Forests (2 ways and similar sensitivity as your speakers). The subs are receiving a speaker level signal from the amp. Both subs and Forests run "full range" via parallel runs of speaker cable. The subs are dialed back such that you only know they are in use due to the blue LED lights or if they are switched off. Definitely, bass is improved but what shocked me was the improvement to midrange clarity and "openness" running the subs brought. I can’t explain why this is so but this was further enhanced when I upgraded power cords running to the subs. Given the Forests by themselves go a little deeper than what you cite for your speakers and given the audible benefit (not just better bass) I’m hearing from the SB1000s, I’d encourage you to try a pair of subs. (I’m assuming the RELs you are considering are self-powered). Hope this is helpful.
ricmci, if you wonder if more subs really is better, check this out. https://systems.audiogon.com/systems/8367My first sub was the Talon Roc in the corner. A fine sub. But only one. One does not work very well. (Sorry, guys, but it doesn't. Can't.) Once I learned about the distributed bass array and decided to build my own the original play was to get the DBA up and then sell the Roc. Because who needs 5 subs?

So I built the 4 and removed the Roc and the DBA was awesome and was just about ready to sell the Roc when for kicks decided to try and see what it would be like with 5. Well it didn't add bass, its not about more, its about better, and 5 is a lot better. So the Roc stays. 

That's what you want. Don't worry too much about which ones. Four of just about anything will be better than one of anything. Four really good ones will be even better of course but mostly its about numbers not quality. Don't worry about placement. Placement with one is a huge headache, and nothing works anyway. Placement with two or three gets easier, because with more subs there are more modes and its easier to have them smooth out. Placement with four or five is trivially easy. Pretty much anywhere you plop them down you will hear awesome bass. 

I worry that by awesome you think I mean better than usual. No. I mean awesome. The exact word that was used three times by the last guy to come and listen. Deep, articulate, powerful, smooth, and 3D in an enveloping immersive way you have to hear to believe.

So get your two. For now. Consider it a good start.

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