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PQS-302, PQS-402 and Loreley Mk III all share a common design. They almost share a common style of name. PQS stands for Premium Quality Speaker. The Loreley was originally called the PQS-604 until it was renamed after Loreley, a legendary German mermaid who lures sailors to their doom on a particularly treacherous part of the river Rhine at Sankt Goarshausen in Germany. But we digress. These models came about due to a need to provide higher sound levels and drive larger rooms than was possible with our single DDD driver models. Our largest single DDD driver model is the Borderland Mk IV. This can produce a maximum output level of 108 dB and drive rooms up to around 90 sq m (950 sq ft). 108 dB is louder than many conventional loudspeakers, but to get closer to “real life” music dynamics and sound levels, we needed to go higher still. To do this we had to be able to move more air, which requires more drivers. Getting higher output levels from the DDD driver is achieved by simply using either 2, or 4 DDD drivers and mounting them coaxially in a vertical column on the front of the loudspeaker. Resonances in the columns, which would others colour the sound, are minimised due to their circular shape and the fact that they are made from aluminium, which is a comparatively soft material.
The matching bass systems require multiple drivers and this necessitates large enclosures that have to be separate from the DDD drivers. This arrangement gives considerable flexibility in the range of bass systems that may be implemented, as can be seen from the table below. You can also see that the Loreley has a very high maximum output level, as well as a very well extended bass. In a suitably large room, it can produce playback levels and dynamics that are extremely realistic.
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