The EB1 has a three-metre transmission line, which in the company of a 250mm chassis bass driver, makes for bass extension that's claimed to go all the way down to 19Hz (-6dB). This approach simultaneously increases extension and substantialy reduces harmonic distortion in the bass. PMC operates its transmission line rather like a crossover, by using damping to filter out bass above 100Hz and making a quarter-wave length line whose output takes over from the bass unit below 40Hz. A pure transmission line absorbs all the rearward radiation from a drive unit, B&W's Nautilus tube being a good example - but that requires an unfeasibly long damped tube behind the bass driver.
In the case of the EB1 we have what the company calls an ATL or advanced transmission line.Īdvanced being a description for the way that PMC uses a combination of foams that it developed with bed specialist Relyon to damp the line and thus more accurately tune the frequencies that exit the vent. The EB1 is still not a compact speaker by any stretch, but it is very nicely put together and looks great in a walnut or indeed the cherry veneer as tested here.Īs with all of PMC's designs, the cabinet uses transmission line loading rather than the conventional reflex porting. There was a time when the accommodating other half would put up with such a thing in the living room but since Grand Designs and the like arrived on our screens, loudspeakers have had to shrink or get a lot sexier to claim their piece of domestic real estate. As it's a standmount it ends up being a similar height to the EB1 in practice, but is somewhat inelegant by comparison.
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