I wish it worked that way. It would make it sooo much easier to justify paying retail. Unfortunately, almost every shop I have been to has had non functioning soundboards or soundboards that just ******.
The last one I went into had a sub I had been considering --- but it was in a pre fab ported box. I could tell by looking at it that the box was way undersized. He had no idea whatsoever what the box was tuned to.
The sales people are generally ignorant if not misinformed.
I don't mean to be adversarial, but you may want to share those thoughts with your dealers. Then again, your dealers may be a step above and in that small minority that are worth a ****.