Sub Question

Kclone: RELS are unusual in that they recommend binding the sub inputs to the binding post of the speakers.

Therefore, I don't think they introduce any crossover into the circuit.

It may be possible to wire them in different ways. Look at picture of backpanel and see if there is crossover.

Personally, I would get two subs and highpass them in series to my mains, then set up the room carefully. I would get sealed subs if I could afford them.

Well, IMHO, I have found my subs. to not only provide
a solid foundation, indeed taking the pressure off the
main speakers.

My personal Biggest surprise, is how the vocals are

much more full, and life like.

Never expected that. Huge +!

All instruments, become much more distinct and dynamic.

Given the right subs. in the right set-up, adjusted

just right, they (the subs) will disappear.

Most folks, NEVER imagined I use 3 subwoofers.

Because, I am not out for the "one note bass"

like the people get with the 18" sub. in a Civic.

But only YOU can decide, what is BEST for You!

I can assure you, that music, and movies, will

NEVER be the same, with the likes of a couple

of Velodynes best subs. an 18" an 2 each 15"'s

they are just idling, and they smooth each other out.

Flat at about 11 hz. which is plenty deep IMHO,

especially playing organ music.

Careful! Crockery, and dishes, have been destroyed.

"Seismic", becomes a word that your friends will,

start using, when say a 44 magnum is fired in a movie,

you HEAR what it REALLY sounds like.

Automatic weapons, are frighting, as they sound so real.

Check out some subs. in your listening room, listen,

your ears will let you know, when you are in the

"Butter Zone", where it is ALL Good!

Not exaggerated low frequency response, but just

"Life-like" reproduction.

I Love Music

OP - I agree with your friend. When you properly set up a sub (preferrably two) it will not be noticeable until you turn it off. That is how things should, and can work out for you. I'd get one (or two) and an SPL meter and sub freq. tracks to place and dial it in so it does not overpower/ interfere with your mains, but enhances them. Once this is achieved (not difficult, just a little time consuming), you will likely never want to not have a sub again, almost regardless of how low your mains can go.