What could cause low-frequency roll-off in the downstream spectrum?

Low-frequency roll-off in the downstream spectrum can be attributed to specific issues in the transmission path. A loose seizure screw in the downstream path can lead to increased resistance or poor connectivity, which impacts the quality of the signal. This poor connection can attenuate the low-frequency components of the signal more than the higher frequencies, resulting in a roll-off effect in the lower part of the spectrum.

Maintaining proper connections is crucial, as any looseness can create points of weak signal transmission, leading to unbalanced frequency response. In contrast to other choices, the role of the seizure screw specifically relates directly to the integrity of the downstream signal path, thereby being a plausible cause of low-frequency roll-off. Other options, while they may cause various issues within a system, do not directly explain the phenomenon of low-frequency attenuation in the spectrum in the same manner.