I was going to say "no subs, unless they're for home theater", but I guess it depends on how much bass is too much? If your answer is "never", add some subs. Two is good, three is better. Integration is going to be a problem, though, without some kind of processor. Lyngdorf makes a good one.
Personally, I'm not a fan of Krell, but Plinius matches up to the Revel speakers quite nicely.
My room is 14x25 with very high ceiling and I don't need any sub at all. But I listen to mostly jazz and classical and some light rock. Perhaps subs can be useful for rock.
High quality powerful amps are recommended. Salon 2s are very coherent sounding with excellent integration of all the drivers. The bass response is extremely fast, so adding a sub may require some effort unless you are very experienced. I use subs for home theater only and always stay with full range speakers for two channel without subs.
I am sure the folks above can show use how to add subs to the Salon 2s. Happy listening.
Irv is right about the possibility of your amps being out of spec by now. Things like capacitors are pretty much near the end of their useful lives after 20 years, depending on how much use the amps have had. At least get them checked out so you know they're giving you all theyre capable of.
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