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Following up on if new information of Marantz SA-10 were released overnight, I found Steve Harris has profiled those unique speakers, excerpt : « Background and technical information What happens when the team that develops some of the world’s most successful loudspeakers, albeit for other companies, decides to make something for itself? For reasons that may be just ‘because we can’ or maybe ‘we need a better monitor to understand our electronics product development’ or maybe just “what happens if we bring all our skills together” the team decided to design and prototype a significant loudspeaker. It’s an internal research project, looking for real-world solutions that were affordable and repeatable. The team have worked for years on measurement and modelling of drive units to the point where they are convinced these are no longer the bottleneck in system design. The WM-3 with its large enclosure, was an ideal vehicle to model measure and prove out their theories of enclosure design. Years of empirical design combined with powerful computers and advanced modelling software has been combined with the experience to be able to model and predict cabinet design, this speeding the design process considerably The WM-3 is a large loudspeaker that can sound like a very large one but more importantly it can also sound like a small one. There is no identifiable cabinet thrum that drones and creates a pseudo low end when it should not be there. The WM-3 as it is known – as this is the third prototype (not that you would know it was a prototype from its fit and finish) – is the good looking sibling of the WM-2 that was experienced by Ken Ishiwata from Marantz who instantly decided that this was the loudspeaker to use for the Marantz demos at the Munich High End Show. So what makes the WM-3 special? Let’s start with the fact that with a sensitivity of 90.5dB /2.83V a minimum impedance of 4.8Ohm so a nominal system impedance of 6Ohm with a maximum phase shift of -300 +10. Its an easy load to drive. The bass driver is a special version of a 15in Beyma... » Link to read more