 Hi, my name is John. I'm the Marketing Communications Manager for Celestion. I've been here almost 20 years now, I think. Celestion were really at ground zero when it came to guitar speakers. We built our first purpose-built, purpose-designed guitar speaker way back in 1957-58 to go into the combos that were just emerging back then in time for the early days of rock and roll. And we've been innovating guitar speakers ever since, really. That first speaker became what's now the Alnicole Blue, and that was followed in a few years later by the Greenback, the G12M and the G12H Greenbacks that were in the 4x12s of the 1960s, and all those guys who were rocking the stadiums back then, they were all using full stacks with those speakers in them. And really that's been the story ever since for Celestion guitar speakers. It's a case of innovating and continuing to improve and diversify our range of speakers, and that's come through lots of different routes, whether it's customers asking us for different tones, or whether it's amplifiers getting higher powered and having to create a speaker that's better suited to your 50 watt amp or 100 watt amp as your amplifier's got more powerful. So that's really been the DNA of Celestion guitar speakers. So we've been working in partnership with Blackstar probably ever since the company began, and we're very happy and proud to have that association. So Blackstar approached us a couple of years ago, just to talk about a more lightweight speaker. And we spent some time developing a few ideas and came up with the Zephyr concept. And I think what we've got in the end is a really nice sounding speaker, and I think it will work well with this new range. Hi, I'm Paul Cork, Head of Engineering. It was great. After picking up and carrying lots of combos around in my life, about time someone was going to do a lightweight version, and we've seen in the last few years PA and bass guitar adopting lighter woods, lighter amplifiers. And this is the first time I really heard that a guitar speaker company was going to be doing it. There was a bit of brainstorming involved, but there's, you know, in a manufacturing sense there are certain kind of set rules that you can use to get a product. And we kind of adapted our designing and adapted the manufacturing processes to basically pull all the weight out of the driver that we could, but without fundamentally affecting its performance. So we maximized the efficiency of the magnet assemblies. I mean, the development process itself uses a lot of finite element analysis, which is basically an engineering process that's been developed for the last 50 years or so. Basically you have one big problem and you break it down into lots of small problems, which are then solved by a computer, and then the answer is assembled and you get a result out. And basically with the process that we used for this, it was just looking at the magnet flux and how the magnet flux goes around the whole magnet assembly and through the gap, which is the gap flux which powers the voice control. We can show you some pictures when we go into the office. So I mentioned the FEA downstairs and this is going to go through a quick example. So this is a typical magnet assembly of front plate, magnet and pole plate. And I've drawn this on the screen. This is the magnet, this is the pole plate and the front plate. And in the FEA world, you basically add a mesh to it. In each intersection of the bits of mesh, there's applied a mathematical equation and there's a finite number of mathematical equations, hence the term finite element analysis. It's all very boring, really, and it will basically tell us the flux in the magnet assembly, which is what we're interested in. And this is basically the flux pattern inside the magnet assembly. So the yellow sections are areas where the flux is at its highest and the blue and the reddish is when the flux is lowest. Now what we did with the Zephyr was, we assumed that the darker blue areas of the metalwork weren't actually doing anything. So to save weight, we basically took them off. So we removed the metalwork from these positions and through the centre. And eventually we came up with this, which is basically the Zephyr magnet assembly. So you see we've removed a lot of the metalwork here and the metalwork here and all the metalwork in the middle. And all that is to save weight. The magnet itself is smaller, so to bring back more of that flux we've put a second magnet on top of the pole piece here and there it is, a Zephyr magnet assembly. We have a listen to pretty much everything before we send it to the customer. Obviously we don't listen to the speakers in the exact same cabinets in the exact same environments. So we can't say that it's going to be exactly how the customer hears it. But we had a listen. It sounded a really nice sounding driver. And we sent the first prototypes off to Blackstar. They gave us some feedback on what they heard. We then adapted the design slightly, sent them the revised version in and I think that was the one that we're now moving into production with. It was kind of a vintage tone, but with a versatile twist to it if you like. So it's a driver that works well in clean. It has the great vintage break up that a lot of players like. But you can also stick a distortion pedal on it and it'll still hang together and give you a credible sound without turning into a mush or anything. So basically it's a good all rounder. So basically this is the size of magnet in a traditional design. You see the thickness of the metal plates and the diameter of the magnet. So using the FEA work we were able to dramatically reduce the diameter of the magnet assembly. We've skimmed a lot of the metal work out which removes weight and to bring some of the sensitivity back there's a second magnet that sits on top of the pulp piece inside. So basically it's got two magnets rather than one they're both a lot smaller and basically produce the same amount of energy as this size magnet. So using the FEA work we've managed to get the magnet assembly weight down from 3.5 kilograms to 2 kilograms on the Zephyr.