Hi guys. I’m new to the forum. Just recently I bought a new Yamaha DGX 660 and would like to get a couple of speakers for it. I have it set up next to my grand piano in my house and would like to have more volume. I’m not looking for something to blow the windows out but would like it louder than the built in speakers. I understand I have to use the headphones jack. Does that mean I can only have it hooked up to one external speaker? What’s the best way to get good stereo sound out of it with at least 2 speakers? Does it need an amp between the piano and speakers or some kind of splitter? I appreciate any help I can get. Thanks! Jon.