Gary, you are right, weight doesn't have anything to do with sound quality...but build quality..it has everything to do with.....

Weight has everything to do with playability..a responsive keyfeel...weighs more..and as Diki says...a keyboard can't keep moving around on you while playing..

Every keyboard I have owned that weighed under 25 pounds...just moves..either on an Apex or X stand..My V-stand holds the best..


The other side...my late MediaStation didn't move at all..followed by the G70..
I also noticed 76 key models seam more stable..and naturally a little heavier..Even the 27 pound E-60 stayed put..but the E-50 (20 pounds) did not..
10 pound controllers are almost a joke to keep still..as were the under 20 pound Juno stuff...also the 16 pound BK5 and Prelude..
With my experience..maybe that is why I want the heavier G70 on stage..

BTW: Gary, you are talking to a long time motor head..

You need to do more research..Corvette models like the ZR1, C06, and C7...get on youtube and see the match ups with the likes of ferrari, Porsche etc..
I have a long history of powerful muscle cars. incuding an older Shelby 427 mustang, 428 Cobrajet Mustanges, Boss 429 Mustangs, and many big block Chevys.....My best performer was a 1969 425 horse SS 396..that ran low elevens in a quarter mile...at near 130 MPH.
PS: I was a two time New Jersey State champion ..too..

Now I put around with my V-6 SUV..