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KEF Reference Bookshelf Demo From AXPONA 2017

2017-04-27
which are hand built in the UK in with the notion that look everybody's got different tastes everybody's got different rules different kind of furnishings and it's a very fine way of changing the compliance of fundamentally of the response of the class leaders and our efforts freeze and reference fires clickable and it's something as simple as this we have option which I'll replace them yeah the long ones the short ones we are going to play two minutes of your face and nothing change not change the volume and simply change the port tubes I'll explain later what is actually technically going on but then ask you a bunch of questions that are please it's non intelligence the test if you don't hear the difference that you're not sure at a time but okay let's go did you pick the four tubes and of course it's like a camera bayonet fitting you must let any air escape for the camera life because it's quite a difficult piece of engineering but now we're putting the long for kids and there's no cheating we have not traitor volume or anything and from the top between one or two who had a preference okay who preferred the first we preferred the second okay select majority for the second would anybody like to volunteer who preferred the first in your own words why those who prefer the number one short tubes in your own words okay okay yeah yes good works for me it was I got to be a bit unkind here the way I listened for me that was music and the second one with high flying let me explain what actually goes on if we measure that change the compliance when we use the short pause the that the first the the response if this is high this is lows response is linear to a lower frequency and then the drop off the curve is quite steep so in the absolute lower base there is less energy if you like there is more mid-range presence using the longer Port tubes the it starts to roll off gently at about 150 Hertz and the curve remains gentle and ultimately we have more energy at the extreme low base but it's maybe a bit of an exaggeration to say that in the second we have a bit of a mid-range suck out I am particularly I love voices and mid-range and all that it irritates some people because I think it's muddled so there's no wrong and no right it is very very marginal the differences are depending on room anything from as little as half a DB to a DB that certain frequencies but it's a correct way to do a very simple idea and we've all got different rooms we've all got different tastes with all these two different sorts of music and that's just on the reference once that's on the on the on the towers we've got double ports and you can do mix and matching of the visit and it really is very interesting just a last word and then we'll carry on with some some some music we had a majority for the long haul didn't we so we'll keep the long 40 its occasion you know you're the guide you're going to buy me flowers because answers but we'll keep the long ports in but just a little word about reference we do a whole bunch of loudspeakers and the kept reference series reference is not an empty words just slung onto it you know hey you know what this is my reference wallet best leather and you know and just adding the word reference means that the guy can charge me more for it but at kept referencing the methodology what does that mean each loudspeaker is hand-built what it's done production line one man builds one pair one man is supplied with Cree matched down to component level and is responsible for assembling a completed loudspeaker pair of loudspeakers very close compare match to an absolute if you come to our factory there is the reference one line standard and it has to within the audible bandwidth with a very close tolerance plus or minus half a DB match and if it fails we beat in the distinct arm you know it goes back then there might be a problem air leak or something like that so it's extreme quality control more expensive to do and it's dare I say part of the justification of these speakers are not cheap they're eight thousand dollars a pair but it is a very unique approach very interesting to see
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