The back side of the speaker wires must be thread locked with a temporary loctite. They will vibrate loose from the thick low end sound that these professional grade speakers will achieve. They also may loosen while connecting or disconnecting speaker wires. You need to do this before they loosen because when they loosen they will cause a short causing receiver to shut off at lower volume and could potentially harm your receiver. These speakers are still a great deal. They have high quality thick low end. Combine them with speakers with high quality highs and mids and you will achieve an impressive professional grade sound for an affordable price. REPEAT do not wait until they vibrate loose or loosen when connecting wires.

Thomas . Review provider: walmart.com