Question

while researching a topic, a student has taken the following notes:

• in 2018, the marlowe acoustics group partnered with the cityline playhouse in dayton, ohio, to test add - on diffuser panels for a 430 - seat theater.
• the team produced 24 diffuser prototypes using a resin 3d printer; each panel had a different ridge pattern intended to scatter sound above 1.5 khz.
• before installation, researchers ran computer ray - tracing simulations and measured each prototype’s scattering coefficient in a small reverberation chamber.
• after installation, impulse - response tests from eight audience locations showed clearer speech in the front rows, but results varied because some panels were partially blocked by lighting trusses.
• a matte paint applied for fire - code compliance filled fine grooves on several panels, reducing high - frequency diffusion compared with the unpainted lab measurements.

the student wants to describe a problem that affected the results. which choice most effectively uses relevant information from the notes to accomplish this goal?
a the project involved producing multiple diffuser designs and evaluating them through simulations and reverberation chamber measurements before installation.
b speech clarity improved in some seating areas after the panels were installed, particularly in the front rows of the theater.
c some of the installed panels did not perform as expected because lighting structures blocked them and fire - code paint filled fine grooves, lowering high - frequency sound diffusion.
d the diffuser panels were designed to scatter sound above 1.5 khz and were tested in a 430 - seat venue in dayton, ohio.

Explanation:

To determine the answer, we analyze each option:

• Option A: Describes the production and testing process, not a problem affecting results. Eliminate.
• Option B: Discusses improved speech clarity, not a problem. Eliminate.
• Option C: Mentions issues (lighting trusses blocking panels, fire - code paint filling grooves) that reduced diffusion, which are problems affecting the results. This matches the goal of describing a problem.
• Option D: Describes the design and testing location, not a problem. Eliminate.

Answer:

C. Some of the installed panels did not perform as expected because lighting structures blocked them and fire - code paint filled fine grooves, lowering high - frequency sound diffusion.