The PQS-302, PQS-402 and Loreley use two separate bass cabinets, as this allows for smaller and therefore stiffer panels than would be the case with a single larger cabinet. For the same reason the Emperor uses four separate bass cabinets. The bass cabinets are stacked on top of each other rather than being rigidly attached together, as this reduces the transfer of vibrational energy between the cabinets. On the PQS-302, PQS-402 and Loreley bass cabinets, two different densities of MDF are used and different densities are used on alternate vertical panels of the cabinet. This reduces the energy transfer between adjacent panels. On the Emperor bass cabinets this is taken further, by also using material of different thicknesses for each panel. To reduce standing waves within the cabinet that might help to create resonances, there are no parallel vertical faces. The shape of the bass cabinets also enables them to act as diffusers for the rear-ward energy radiated from the DDD drivers. This allows these models to be positioned against the wall. As with the HRS-130 and Borderland, Hawaphon® is applied to the inside of each panel to reduce any tendency to resonance.
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