A speaker in which the bass driver is located in an almost airtight enclosure.

A detector circuit in which the load is a resistor connected in parallel with an rf bypass capacitor between the cathode and ground. Since the grid is always negative with respect to the cathode, the tube presents an infinite impedance to the input.

A transmission line with the same characteristics as an ordinary line that is infinitely long.

The capability of a device to provide continuous output over its entire range.

Immeasurably small; approaching zero.

The kind of instrumentation, especially its signal source, in which there is sampling of an entirely different quantity from the one of interest, upon the assumption that they vary in perfect proportion. Linearity or a perfectly repeatable relationship between the two is inferred for the sake of a more convenient signal-source arrangement.

The process of filling the pores of a sintered compact with a metal or alloy of lower melting point.

Boundless; having no limits whatsoever.

1. An airtight speaker enclosure that completely absorbs or dissipates a speaker’s rear sound waves. 2. A speaker mounting in which ideally there is no path of air between the back and front of the speaker diaphragm. An infinite baffle improves the forward radiation of sound at low frequencies and preferably should be a very [...]

A switch capable of sensing acceleration, shock, or vibration. It is designed to actuate upon an abrupt change in velocity.