Showing a graph of their frequency response using a standardized input signal strength is all they can do. If there are folks that don’t like the bass response given that it’s a large tower with 4, 8” woofers, that’s fair. It was a design compromise.
To quote me over at AVS,
“Using 40hz as a lower inroom bound is a good compromise between efficiency, size, extension, and cost. Having a 40hz bound allows most genres of music to be played satisfactorily without the need of subs. On the flip side, the speaker also isn’t ridiculously over engineered in the bass department and somewhat wasted if a person uses subs.
For example, they can extend the frequency response deeper at the expense of efficiency, or they can make an already large enclosure larger to maintain efficiency. All that extra expense is then wasted once it’s highpassed at 80hz due to using subwoofers.
Someone could argue it’s the worst of both worlds - not deep enough to be used without a sub and not efficient enough to be worth the size and cost. Depending upon their goals/expectations, they could be right. That’s how trade-offs work.”
A 2.83v frequency response in no way indicates how loud something can play or what kind of distortion it will have, but one can safely assume a high quality tower with 4, 8” drivers can play louder and with less distortion than a small bookshelf with lower native tuning. Someone who questions the robustness of said towers, claiming they’re weak, either doesn’t fully understand acoustics or has unrealistically high expectations…both could be true. And that is no one’s fault, certainly, not yours. Just continue to help educate them on the trade offs of design choices.