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[Paul Spencer] * COMPRESSION RATIO - Ratio of the driver SD to throat area; Max CR of 2 should be used to be safe unless it is known that the driver can handle more * EXPANSION CONTOUR - the rate at which the cross sectional area of the horn expands relative to axial length; contours can be mathematically described and are characterised as exponential, hyperbolic, conical, tractrix, etc. * THROAT - the aperture adjacent to the driver * MOUTH - the final aperture of the horn device * BLH - Back loaded horn - a horn in which one side of the driver is horn loaded and the other side is radiating into the (outside) air. Reverse mounting the driver doesn't change a BLH (aka Rear LH) into a FLH. * FLH - Front loaded horn - the rear radiation of the driver is typically a sealed compression chamber and the front radiation of the driver is horn loaded. * COMPRESSION CHAMBER - a chamber which is typically sealed which restricts the driver excursion and equalises the pressure on either side of the driver * CUT-OFF FREQUENCY - this the low frequency limit of the horn / driver combination * FLARE FREQUENCY - this describes how fast the horn flares; typically close to the cutoff frequency = next [Bass horn resources] = |