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The 2.6, 2.7i, MG-III, 3.7, Tympani IV, 20.7 and 30.7 all include Magnepan's ribbon driver and thus produce sound up to 40 kHz. The other speakers do not include a true ribbon and therefore produce sound only up to about 18–25 kHz. All Magnepans are 4-ohm speakers, with sensitivity of 86 dB at 500 Hz, 2.83 V.
This 2-way, 4-ohm, design was a physically much smaller product – measuring 425 × 332 × 244 mm (16.7 × 13.1 × 9.6 in) – that required tall speaker stands. Launched in 1978, it was Linn's entry-level loudspeaker until the Kan (a non-isobaric bookshelf speaker using the same Linn D20-LP-1 and KEF B110 drive units as its big brother) was ...
Sixteen ohm drivers (or loudspeakers systems) would be connected to the 16-ohm tap, 8 ohm to the 8 ohm tap, etc. This is significant since the ratio between the loudspeaker impedance and the amplifier's impedance at a particular frequency provides damping (i.e., energy absorption) for the back EMF generated by a driver.
Such loads are around 1/1000 the impedance a line out is designed to drive, so the line out is usually not designed to source the current that would be drawn by a 4 to 8 ohm load at normal line out signal voltages. The result will be very weak sound from the speaker and possibly a damaged line out circuit.
From this perspective, speaker cabinets need to have easy-to-access horns, speakers, and crossover circuitry, so that repairs or replacements can be made. Many touring acts and large venue corporate events will rent large sound reinforcement systems that typically include one or more audio engineers on staff with the renting company.
American EIA standard RS-299A specifies that (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8-ohm drivers have resistances of ≈5.5 ohms, and proportionally lower for ...
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