My first subwoofer KEFs KC62


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Hello, Hey John Yeah, The Sponsor Of Todays Video

is Audioquest click the link in the description box below bye do you like my new coffee table It’s made by Ps audio on the top here we have the Kef KC-62 subwoofer and every time. I say that I think of casey and the sunshine band. This is a micro subwoofer. This is my first ever subwoofer Normally I don’t cover them why is that well because up until very recently my room had a 35 hertz mode problem. I’ve treated it somewhat with these bass traps around the room from gik acoustics same company that make the wall panels for those that want to know that um so now I think I’m ready to tackle a subwoofer, but i’ve always kind of been put off by subwoofers because they’re usually so bloody large the size of coffee tables.

With 10-Inch Drivers 12 Inch Drivers, But

when Kef announced this little kind of micro sub I thought yeah that’s kind of cool that will just tuck away pretty easily and won’t physically intrude so this thing measures roughly 25 centimeters by 25 centimeters by 25 centimeters and if I turn it around this thing’s on wheels. You can see there’s a driver. This side there’s the controls. I come back to those in the moment and there’s a driver. This side so we’ve got two force cancelling side woofers if you like they measure six and a half inches but careful done something quite clever in here.

In Getting These Two Drivers In Such

a small box is that they’ve had the voice coils sleeve over one another, so they’ve got kind of sort of one almost like motor system. There are two amps inside 500 watts each. Class D so these side woofers force force-canceling drivers Kef call this unicore uni uni hyphen core and like a lot of companies. They also have special names for other things alternate again this around here on the driver is probably it’s quite hard to see, but it’s called p-flex and that’s been designed. It’s almost like a sort of crumpled Concertina effect so that the driver doesn’t distort or do weird things when such high pressure action is going on inside this small cube.

The Um The Enclosure Is Extruded Aluminium

Also inside here they have something called smart distortion control technology that is essentially to compensate for the distortions that take place in such a high pressure environment. If you want to know more about the tech inside this I’ve already done a podcast interview with lead designer Jack Ockley-brown. I’ll put the link here so you can dive right in I don’t want to weigh this video down with endless tech talk. There are a couple of key specifications to note however, Kef rates the output of this subwoofer at-3 db at 11 Hertz. They also specify that it will do a maximum of 105 db, but we have to be careful here because we shouldn’t mix those two up it cannot do 105 db at 11 Hertz.

  • subwoofers
  • subwoofer
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  • loudspeakers
  • bass

Now Obviously It Really Is A

cinch to get more bass in your hi-fi system with a subwoofer like this you. I mean you can just connect the power lead here and then connect it to your amplifier or other things. We’ll talk about about those in a moment but connect the sound source here plunk it down and off you go and you get more bass but there’s way more to it than that. I mean because this was my first proper subwoofer investigation. I really wanted to get into the sort of nitty-gritty of how to set this thing up because it is it is really not just sort of plug and play and off you run not at all.

Theres A Lot Of Work To Be

done to get this sounding good within your existing loudspeaker system. So if this is the natural roll in of the subwoofer so let’s say it’s I don’t know like 45 or 50 Hertz it sort of starts to roll in here and then let’s say this is the natural roll-off of your loudspeakers so behind me. I’ve got a couple of pairs of kefs. about each model in a bit, but the idea is to get the sub to sort of integrate properly to this sort of point. So you actually know this sort of point because it should be flat, so you get the sort of flat integration.

So You Kind Of Youve Got To Do

this and that means the point in which you tell the subwoofer to kick in and also loudspeakers as well we’ll come to that with the subwoofer we can control it here. I mean this tells us the level at which the subwoofer or the frequency at which the subwoofer kind of begins to perform if you like and that determines how good our crossover is that’s one of the factors. Also the gain is another factor because obviously it’s volume it’s you know how loud it is also impacts the results what subwoofer manufacturers are asking. End users to do is design their own crossover between the Loudspeaker and the sub, but yet there is still more yeah We’ve got another windy sunny cloudy, sunny cloudy day so that’s going to mess with the footage. I think or the color temperature of the footage anyway before we move on just a couple of technical terms to cover I showed you this right.

This Is The Kind Of The Way That

these things sort of lock together to produce a crossover And this part here is what’s called a low pass filter so it only lets low frequencies through so if we cross the sub over say 45 Hertz and if it’s 50. We’re going to be up here and if we go back down to 30 we’ll move down here so this is. This area is determined by the low pass filter similarly with our mains. The filter applied to those again we’ll come to that that can also change and that’s you know in here that’s called a high pass filter so basically low pass filters let low frequencies through and high pass filters. Let high frequencies through let’s talk about a real world example behind me you see a pair of KeF’s Ls50 meta they’re the blue speakers.

Theyre A Passive Loudspeaker So They

need an amplifier. I’m using a Hegel H390, which is in the rack behind me and then to connect this sub I tap the variable preamplifier outputs of the Hegel and go right into here now we have to work out where to cross over and which frequency we’re going to cross over our sub at now. According to KeF, the Ls50 meta are 6 db down at 47 Hertz I did email Jack Ockley Brown and said to him. Like you know what’s the best starting point frequency to integrate this sub with those meta and he said somewhere between 45 and 50 Hertz. So we choose that on the dial here so from a purely aesthetic standpoint.

I Wanted To Put This Sub

behind the right hand speaker. So basically take the pot plant out put the sub in there and that’s where I started and I used the the wall setting on the Dsp eq here to compensate for it being so close to the wall because there’s there’s a corner setting here as well and there’s a room setting there’s also an apartment setting which just shaves off. I think the very lowest frequencies to stop you know people living below you begin getting disturbed by your sub late at night. I have offices below me so I’m quite fortunate in that respect but anyway so. I started with a sub there and because that’s pretty much as far as the cables from the hegel amp will reach they’ll go a bit further.

I Moved It Around The Area,

so I moved it around the right hand speaker. So then I put it to the to the left the right hand speaker so on the same plane, But I ended up. I was quite lucky actually the cables would just reach so I could put this sub slap bang between the two left and right channels on the same speaker plane and that yeah that’s for me where it kind of really sort of snapped into position and to find that position. I used a rhythm and sound remixes record, which is basically dub without all the vocals and then I actually used a bunch of other sort of records that weren’t so bass heavy just. to make sure that everything else kind of sounded okay and it really did I mean, but this was after several days of like move this up a little bit this way change the gain change the DsP move it again change the gain change the gain again like it was a lot of trial and error you’re probably wondering what this little black thing is here that’s the receiver of what’s called the KW-1, which allows for a wireless link between transmitter, so either your AmP or the Ls50 wireless 2 and your sub now that’s really useful when you want to do what’s called the sub-woofer crawl because there is a technique where you put the sub in your listening position for me it’s right here.

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  • sunshine band micro subwoofer

I Did Did This I Had To Move

the couch out of the way put the sub here plug it into the wall socket behind all off there so you put it there and then you crawl around the floor. Listening to what the base is doing so. I actually put some of that rhythm and sound on a loop and crawled around the floor a little bit not too much because I just felt like an idiot doing it, but I did it and you crawl around the floor until you find a spot where you think the bass sounds. I guess smooth reasonably detailed not too boomy that’s the really kind of the important thing to listen for because over there it sounded boomy, but as I kind of came this way it sounded less so and again the best spot was right in front of my sideboard between the loudspeakers, so that kind of confirmed my earlier findings of just trial and error but again doing the subwoofer crawl you know it takes time.

All Of These Things Take Time

setting up a sub integrating it with your loudspeakers and your room takes time now. I knew that I got the sub dial in properly when I couldn’t really locate the source of the bass so when I was messing around with it behind the right hand Loud speaker. I’d be like yeah. The bass is coming from over there, but when I had it between the loudspeakers.

On The Same Level As The Loudspeakers

I was playing the blue room by the Orb which has yar wobble on bass and there’s this big gargantuan sound and it felt like the bass was actually coming from the Ls50 meta, which is obviously not the case, but that was the illusion it painted now you’re probably wondering what settings I used well for my six meter by five meter room. I had the crossover set at 45 the gain at 10 o’clock because I’ve got a lot of room loading here the sun’s just come out again that’s Nice and I had the DsP set room as well. So no boundary compensation engaged, but obviously those the settings that work for my speakers in my room and yours will be different and you will have to go through the same trial and error process to get that illusion where the bass sounds like.


The Kef KC-62 subwoofer is John’s first ever subwoofer . The sub has two force cancelling side woofers if you like they measure six and a half inches but careful done something quite clever in here . There are two amps inside 500 watts each and the driver is called p-flex and that’s been designed to create a crumpled Concertina effect so that the driver doesn’t distort or distort or anything like a lot of companies have special names for other things alternate again, but it’s quite hard to see, but that’s what I think of casey and the sunshine band . The sponsor of Today’s video is Audioquest click the link in the description box below to see how Audioquest has run the audio on the Daily Mail on the video . Back to the page you came from The Daily Mail Online News Online home:…. Click here to read more and watch the full video