Squeak,

At the risk of repeating myself, let me repeat myself: I have the luxury of being able to compare the same sample on 2 keyboards, 1 with that (exact) tweeter and 1 without. VERY noticeable difference, particularly on the harmonics of piano bass notes.
The only way you're going to know what the difference is, is to take those tweeters out. I don't recommend it. With out those tweeters everything is dull and lifeless by comparison. They don't do anything until above 6K and the woofers on that design are still working well above 6K. The tweeters dont really come into play until about 10-12k. You wont prove anything by covering the woofer or putting your ear up to the tweeter.
Regards,



------------------
Steve Deming
Assistant Manager
Customer Support Dept.
Pro Audio & Combo Division
Yamaha Corporation of America
YCASupport@yamaha.com
714.522.9000