Placing a speaker in a freezer overnight would not make it stronger. In fact, it could potentially damage the speaker and negatively impact its performance. Here's why:
Temperature Extremes: Speakers are not designed to operate in extreme temperatures, especially freezing temperatures found in freezers. Components like the speaker cone, voice coil, and magnet can become brittle or contract in freezing conditions, leading to potential damage.
Condensation: When you take the speaker out of the freezer, condensation may form on the components as it warms up to room temperature. Moisture can be harmful to electronic devices, including speakers, and may cause corrosion or electrical shorts.
Speaker Components: Speakers are carefully engineered to perform optimally at specific temperatures and environmental conditions. Altering these conditions, especially subjecting the speaker to freezing temperatures, can disrupt the delicate balance of the components and degrade the speaker's performance.
Speaker Enclosure: If the speaker is part of an enclosure, freezing it may also impact the integrity of the enclosure material, potentially leading to structural damage.
If you want to improve the performance of a speaker or sound system, consider other methods that are designed for enhancing audio quality. For example, you can optimize the speaker's placement in the room, adjust the equalizer settings, or consider using acoustic treatments to improve the sound quality.
In any case, it's essential to follow the manufacturer's guidelines and recommendations for using and maintaining speakers to ensure their longevity and optimal performance.