Lee, if you're not using any other amplification, other than a woofer - I recommend you use it full range. Just take a line from the main out and feed it to the sub. Turn up just as much bass reinforcement as you need/want. Balance it with the onboard speakers ... you won't need much. A little goes a long way, especially because the sub is on the floor.

I added a subwoofer to my Kn7000, the sound was much warmer. If you are not playing out, a less expensive Subwoffer will do the job. I am sorry I sold the subwoofer, it turned itself on when the keyboard was turned on, and off when I turned the keyboard off.

John C.

Hi Lee,
Definitely considering getting a sub woofer, when I do , I’ll give it a try.

Thank you Telmo, I’ll check into it too.

Lee, Way to go, congratulations on ordering the SX900, you’re gonna love it.

Even a small bass amp will help a lot. Roll off the highs on the amp and it works as a poor gal's crossover.

Hi Guys,
so basically , if playing out , a bigger sub woofer is better?

I’m only playing in a tiny bedroom, so something with more power could actually be overkill? or does it give better sound quality?

Hi Dave,
I must have been typing same time as you.

So I would get better quality sound? I don’t need it for loudness, only play in a tiny bedroom.

Having a little extra "bottom" can be much appreciated ... even in the bedroom. (LOL)

I'm sorry - couldn't pass THAT one up. Think of your old spinet piano ..... it sat on the floor, resonating the floorboards. With a few small speakers, three feet off the ground, you'll never get that same fullness that the bass can get while travelling across the room, using the floor and walls as a guide. It's simple physics, really.