Which detail from the excerpt proves that Dean creates very good/light sound equipment?

The equipment got great reviews, even though the show did not.

Explanation:

According to a different source, this question refers to the text "On Becoming an Inventor" by Dean Kamen. The excerpt the question refers to is the following:

"I had just finished making a complicated piece of equipment that was to be used for a show opening in Philadelphia called "Fiorello." When the machine arrived they had trouble wiring it, so instead of going off to college that morning for an orientation, I spent several days at the theater fixing my light/sound equipment. The show received poor reviews, except for the mention by one reviewer of the "special effects," which, he wrote, were "outstanding.""

In this text, we learn about how proficient Dean is at making good light/sound equipment. The author tells us that Dean spent a long time working on this equipment. When the reviews came out, while the show was reviewed poorly, Dean's work was called "outstanding." This detail shows that Dean is very good at his job.