Why Do Speakers Hiss?

The video begins by addressing a common frustration: why do speakers hiss when nothing is playing? It immediately clarifies that there isn’t a single culprit, but several plausible sources of hiss and other unwanted noises. The first major focus is on amplifiers, explaining that inexpensive amps can introduce their own electronic noise and hiss because they amplify the noise present at their input as well as the desired audio signal. The presenter suggests practical fixes like upgrading to a higher quality, lower noise amplifier or using external amplification with passive speakers to minimize hiss, and notes that many active speakers can also stay quiet if the design quality is good. The discussion then shifts to ground loops, which occur when equipment plugged into separate outlets is connected via a signal cable, forming a loop that can pick up magnetic interference from the building wiring and manifest as a hum. A simple solution offered is to connect everything to the same outlet or power strip to reduce loop effects, though not all hiss comes from this issue. After covering these electrical sources, the video explains RF interference as another potential culprit, caused by shielding weaknesses or nearby devices such as Bluetooth gadgets or dimmer switches, and it recommends moving equipment apart or using RF filters when necessary. The host also explores a more pleasant yet still noisy phenomenon: vinyl and tape hiss, which are inherent to analog media playback and can be mitigated by using well maintained gear, anti-vibration measures, or postprocessing, while acknowledging that some authentic warmth is a trade-off with noise. The segment concludes with a reminder that there are many other potential noise sources, including older PCs and internal DXs, and invites viewers to share their own interference experiences in the comments for future episode ideas. Overall, the video blends practical diagnostic steps with contextual explanations about why different components contribute to hiss, emphasizing careful component selection and setup rather than a single magic fix.

Topics · audio · electronics · home_theater · noise_management · vinyl_audio