If this cancels the deal, you know you are missing something you would rather not have had. Don't purchase without outside confirmation that the piano is worth what is being asked. Contact your tech in advance so he knows that you will be calling with this request. Don't make the purchasing decision and then call a tech for an appointment. This is where the stereo speaker analogy comes in.
Some pianos have a bright treble.
Some a booming bass. Some have both. The home environment impacts brightness. An instrument with a bright treble in the showroom may be too lively in a room with very little upholstery, drapery, and carpet. Play the instrument, using the literature you like best.