Loudspeaker protection

The White Noise loudspeaker protection module is designed to save your loudspeakers in the event that power amplifier failure produces a large DC offset at the loudspeaker terminals. A surprising number of consumer hifi amplifiers incorporate supply rail fuses to protect the amplifier in the event of overload. Invariably only one of these fuses blows when the amplifier is overloaded, leaving the loudspeaker output terminal sitting at the potential of the intact supply rail. If there is no loudspeaker protection module; as is the case in the majority consumer amplifiers, including many quite expensive ones; then this state of affairs spells death for your bass drive unit. A protection module will disconnect your loudspeakers before any damage can be done.

In addition to protecting loudspeakers from DC offset voltages the White Noise module keeps the loudspeakers disconnected for a few seconds after switch on, allowing the power amplifier circuitry time to stabilize and eliminating switch on thumps. The module also disconnects the loudspeakers before the main supply voltages start to fall at switch off, thereby eliminating switch off crashes and squeals.

The White Noise loudspeaker protection module is single channel so that it can be incorporated in monoblocks without "wasting" the other channel of a stero unit. For stereo or dual mono power amplifiers simply use two modules. The relay used in the protection module is a sealed 16A device with silver alloy contacts, in contrast to the lower quality 10A relays used in other commonly available loudspeaker protection units. The White Noise unit also has low and symmetrical trip voltages.