Final answer:
House amplifiers with a passive return path are used in cable television systems to boost signal strength for distribution while allowing return signals to pass back without amplification, thereby maintaining signal integrity and reducing interference.
Step-by-step explanation:
House amplifiers with a passive return path are typically used in cable television systems. These amplifiers boost the signal strength for distribution of video, data, and voice signals to multiple subscribers within a local area, ensuring quality service without signal degradation.
The passive return path feature means that these amplifiers are designed to allow the return signals (usually from subscribers back to the cable company, for services like internet and telephone) to pass back through the amplifier without being amplified, which is critical in avoiding noise and distortion in the return path frequencies.
This is especially useful when the return path does not require amplification, or when it is preferable to have a dedicated system for the return signals. Therefore, house amplifiers with a passive return are best suited for scenarios where a boost in the forward path is needed but the return path is better left unamplified to maintain signal integrity and reduce the chances of interference.