At some point, measurements will be telling, but usually I thinks it's a mistake to judge a product solely on its specs. It's usually a good idea to listen before reaching a conclusion.
In fact, I'd go a step further and say that - Even if you HAVE heard a component, it's tough to definitively have an opinion of how it sounds. System matching and ESPECIALLY room matching are critical.
You can look at specs and rule out a component for use in a given application - a mini monitor that's down 10db at 100hz probably won't do well in a 5,000 cubic foot room, but that doesn't mean that it sounds bad. A really poorly designed product (horrible on-axis response and power response in a loudspeaker, for instance) is probably a decent indicator that a product won't sound good in any application, but IME such products are pretty rare.
In fact, I'd go a step further and say that - Even if you HAVE heard a component, it's tough to definitively have an opinion of how it sounds. System matching and ESPECIALLY room matching are critical.
You can look at specs and rule out a component for use in a given application - a mini monitor that's down 10db at 100hz probably won't do well in a 5,000 cubic foot room, but that doesn't mean that it sounds bad. A really poorly designed product (horrible on-axis response and power response in a loudspeaker, for instance) is probably a decent indicator that a product won't sound good in any application, but IME such products are pretty rare.