I'm thinking of buying some monitors if it will boost the sound quality but I already have like a 400$ speaker for the computer. Im wondering if it's worth or not for the investment
closed as primarily opinion-based by Tetsujin, user45266, David Bowling, Tim, Doktor Mayhem♦ Feb 15 at 12:38
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I'm not familiar with the logitech z906, but it seems to have good reviews, so it looks like it's a very capable full-range speaker system.
As you haven't identified a particular problem with them, I would suggest they are likely to be perfectly good for monitoring while playing your keyboard.
If you were to get a good pair of monitors, with a good amplifier, and site them and mount them properly in an acoustically-suitable environment, then you might find they had "better quality" than your Logitech in some way - such as a flatter response, for example. But that wouldn't necessarily make them any more enjoyable to play through.
A good keyboard amplifier will obviously be more portable and will probably let you play a lot louder than the Logitech system without distortion - but at home, you don't need anything portable, and there are presumably limits on how loud you can play anyway?
To quote Billy Joel,
Don't waste your money on a new set of speakers
You get more mileage from a cheap pair of sneakers
Next phase, new wave, dance craze, anyways
It's still rock and roll to me