I've played heavy basses that sound awesome and ones that sound like crap. Same thing with light basses. Im with you, I don't buy it. The reason I think you see that on Spectors is that Maple is a lot of times quite heavy and most Spectors have at least thick Maple Tops and many that are solid maple wings. Most will weigh more others are light. My 87 NS2A is all maple, sounds great and is one of the lighter basses I own. Never bothered to weigh it.