I'm not a critical about the sound quality, but I expected a better sound.
In particular the bass sounds did not go low, but giving them a 'boom boom' effect.
I assess the sound in a home situation with the volume low / normal for practice.
I am really hesitating between these 4 models.
And I am also wondering if the extra price between PSR-SX700 and PSR-SX900 is worth the money.
There are several very good YouTube videos that go into all the details of the PSR-SX700 and PSR-SX900. They will help you to decide where to spend your money. I won't comment on Korgs, because I don't know anything about them.
Bottom line is this.
How much do you want to pay to get the quality of music that you're looking for?
Are you a Home Player, or a stage or other performer.....or maybe wanting to go that route?
I own an SX700 (in fact I own 2 of them). I find it to be the most satisfying keyboard to play, and it has PLENTY of sound, and the advantage of being able to be loaded with pretty well endless other Yamaha styles, registrations and voices from many other instruments and sources, including from this great site. Just don't load everything at once!
Why did I NOT choose the PSR-SX900? I am fortunate enough to be able to buy either, or even both, or even a Genos, but the SX700 does everything that I could wish for. Spending more doesn't always equate with getting better. I'm a home player, so don't need all the bells and whistles that a professional would find advantageous. think about that carefully, and before rushing to the bank.
ALL keyboards with built in speakers will provide good levels of sound, and the speakers on both SX models are more than adequate for home playing, or even for playing in a reasonable sized room or hall in my opinion. Obviously, if you want to fall out bigtime with your neighbours, then you can always hook them up to Yamaha or other amplified speakers, and make a **** of a LOT of noise. I find mine absolutely adequate, and with decent headphones, the sound is excellent. But if you're going to perform, then be prepared to buy bigger speakers and get your wallet out. You can spend more on speakers than on a keyboard quite easily.
Chasing perfect sound can work out VERY expensive. Factor that into your buying decision.....I never have done, because I look after my hearing and believe me, tinnitus is not something you want to get! The SX700 and SX900 have enough sound..Period.
YAMAHA make very very good instruments. Become a full member of the PSR Forums, and you'll get the full benefits of this site.
You will enjoy the many subjects that come up for discussion, and get help to understand your new keyboard which can be invaluable.
Plus the benefits of years of experience from many Yamaha players.
Finally.....Be brutally honest with yourself. How good a player are you? Ask yourself that twice.
Will you get any benefit from buying a much more expensive arranger keyboard than you actually need? Sure, it's always nice to have the best, but have you got the time and more importantly, the personal effort to get to learn it, because there's a lot to take on board. Be honest with yourself.
Always do the equation. Is it NEED or WANT?
NO instrument will automatically make you play better, but having a good keyboard will certainly inspire you to become one.
I can only speak for myself, but for me the PSR-SX700 is without doubt, the finest keyboard on the market at the moment, at a price that is both affordable, and adequate for my purpose.
As I always say......The CHOICE is yours. You're the man spending the money!
Keith