@stevecham
First off congrats on having a big fan of your sound system!
Forgive me if I am wrong but, you may have taken this post in a different context.
My take on it is the presenter is saying how we judge how good a speaker can replicate an instrument and when building a speaker what he seeks and if it can do well its a good measure on what it might do with other instruments.
So he is saying let's use the sound of a bowed Double Bass vs. an electric Fender Stratocaster guitar which has multiple potentiol nuances to its "sound".
