If you really need to know, measure it
Gold Line manufactures the tools that answer your audio questions!
Gold Line is a long-established brand of acoustic test equipment for installers/integrators. Their impedance meters, real-time analyzers, phase testers, and audio oscillators are found internationally in labs and workshops, as well as venues equipped with sophisticated public address systems. Gold Line offers all of the products you need to measure audio issues, analyze them, and find a solution.