McIntosh MA352 replacement

@kvpower IMHO I would do a Gold Lion tube roll first. It's a couple of hundred $$s. If that works it will save you big bucks and you get to hang on to the Mac. If it doesn't you can resell the tubes. My bet is you will hear a significant improvement. Good luck to you.

Without maximizing speaker placement and room treatment, swapping the amp will achieve minimal (or worse) performance improvement. The multiple suggestions for stereo subwoofers is also spot on. It’s about way more than just low end. 

I appreciate all your input. I ordered 2 KC62 subs already. I’m also ordering the tubes, I'm curious to see what they will do. Thank you all.

@kvpower getting those KEFs is a great move. They are tiny and easy to place yet go down to an astonishing 14 Hz, I think.

(I am myself a KC92 owner. A fantastic sub, but a tad larger than the KC62.)

And as other people have mentioned it is not only about adding the lowest frequencies but to fill out the entire bass range throughout the room. 

Just make sure to don’t make the common mistake and place them next to each main speaker but diagonally in the room as much as you’re able, for that very reason of avoiding bass nulls and peaks you inevitably will get if the bass only emanates from the main speakers location. 

Thank you bl.