I would also think they would me in stereo. I got this idea from some other people on a forum saying that it was mono. I am not sure, it was over a year ago that I checked it out and at the time I was mostly interested in how the sub sounded coming out of the headphone jack. It did sound better if I used an adaptor with a mini female in stereo to a 1/4" male in mono.

It actually would make no sense of the headphone jack was in mono. I then presume that I read incorrect info.

I no longer have the Tyros 1 to check so maybe someone that does could verify this.

However, I do remember trying the sub going straight into the keyboard and also using a Behringer UB802 mixer. There was definitely a difference between the two with going directly into the keyboard sounding better.

Best
Scott



[This message has been edited by Scott Langholff (edited 12-22-2006).]