Boxe German Physiks PQS-302

Boxe German Physiks PQS-302

Boxe German Physiks PQS-302

Overview

 
The PQS-302 is based on our PQS-402 and is designed to enable the quality of reproduction provided by its much larger stable-mate to be enjoyed in medium sized rooms. It is an exceptional loudspeaker, producing realistic and detailed three-dimensional stereo imaging, excellent dynamics and of course our trademark fast, deep and well-controlled bass. Naturally it also offers the finesse and transparency that all German Physiks loudspeakers are famous for. It combines these attributes with the ability to produce sound levels up to 112dB.
 

 
The PQS-302 uses two DDD drivers and two 8-inch long-throw woofers to provide the exceptional dynamics that enhance the sense of listening to a real performance.
 
The PQS-302 uses two DDD drivers to provide a very wide dynamic range, while retaining their excellent transparency and resolution. The DDD drivers cover the range from 170Hz to 24kHz, eliminating the mid-band crossover point found in conventional designs. Combined with a new bass system design, this gives improved clarity, revealing more of the music‘s subtle nuances. It goes without saying that the PQS-302 also offers the finesse that all German Physiks loudspeakers are famous for. Even more impressive is that it combines these attributes with an ability to produce output levels up to 112dB for a more realistic recreation of live-music like dynamics. This is why the leading German high-end audio magazine Stereoplay has been using the PQS-302 as its reference loudspeakers since 2010.
 

Fast And Extended Bass

 
The outward appearance of the PQS-302 bass system is similar to that of the PQS-402. Two bass cabinets are mounted one on top of the other and stand between a top and a bottom plate. None of these components is attached to the other using screws or any form of hard connection. Instead they are held together by a system of interlocking collars. This combined with the fact that the two cabinets have different weights, as do the top and bottom plates, means that resonances are reduced to negligible levels compared to a solid structure.
 

 

A Different Approach

In order to obtain a bass response with the required speed and extension, we could not simply scale down the PQS-402 design, so we have employed a totally different approach. Each cabinet houses a single 8-inch woofer mounted on one of the forward faces, with a reflex port on the other. This provides bass with the high speed necessary to match the DDD driver, whilst also producing a well controlled and balanced response down to 26Hz.
 

 

The heart of all German Physiks loudspeakers is the unique omnidirectional DDD driver

 
The German Physiks DDD driver uses a cone made of extremely thin (0.15mm) carbon fibre. This is very light, but also very rigid. Each driver is hand-built by a skilled technician in our factory in Germany. This is a painstaking process that takes 6 hours. After assembly, each driver undergoes a series of rigorous tests. It is then subject to a 96 hour pre-aging process, playing specially selected music at high level. Finally, it is retested and put together with another driver to form a matched pair.
 
The DDD driver has two key distinguishing features
 
1. It is omnidirectional, meaning that it radiates the sound evenly around it.
2. It has an exceptionally wide operating range. In the Unlimited it covers the range from 200Hz up to 24kHz – almost 7 octaves.
 
This extremely wide range is achieved by the use of 3 modes of radiation
 
Pistonic radiation
Bending wave radiation
Modal radiation
 
By comparison, most loudspeakers use drivers that only use pistonic radiation. These have a much narrower operating range and as the frequency rises, they tend to concentrate their energy into a progressively narrowing beam. This is explained in more detail here.
 

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