0:00:24 > 0:00:28Hi, and welcome to Ricky's Radical Reinventions.
0:00:28 > 0:00:32My name's Ricky Martin, and I love making stuff.
0:00:32 > 0:00:33I'll give anything a go, me.
0:00:33 > 0:00:35Drilling, doodling, experimenting,
0:00:35 > 0:00:37oooh! A bit of twiddling.
0:00:37 > 0:00:38That's my van.
0:00:38 > 0:00:39Drawing,
0:00:39 > 0:00:41er, talking,
0:00:41 > 0:00:42origami,
0:00:42 > 0:00:43skateboarding,
0:00:43 > 0:00:45all sorts of animation.
0:00:45 > 0:00:47Oops!
0:00:47 > 0:00:49But mostly, I like to figure out how things work,
0:00:49 > 0:00:53reinvent them for myself, and then finally make them really big.
0:00:54 > 0:00:56Have you ever thought that everything you've ever used
0:00:56 > 0:00:58has been invented?
0:00:59 > 0:01:00Yep, that's invented.
0:01:00 > 0:01:02This is also invented.
0:01:02 > 0:01:04And that's...that's not invented!
0:01:04 > 0:01:06That's grown!
0:01:08 > 0:01:10All right, so not everything, but wherever you are,
0:01:10 > 0:01:12whatever you're doing,
0:01:12 > 0:01:14chances are you're probably using somebody's invention.
0:01:14 > 0:01:16Now, this got me thinking.
0:01:16 > 0:01:18We could reinvent some cool inventions
0:01:18 > 0:01:20with stuff you've got lying around your house.
0:01:20 > 0:01:23Trust me, you'll be amazed at what you can make.
0:01:23 > 0:01:25So, we're going to look at inventions we can redo,
0:01:25 > 0:01:28they're going to be radical, and my name's Ricky.
0:01:30 > 0:01:32Today, we're in Bristol.
0:01:32 > 0:01:36Well, right now, I'm in a field,
0:01:36 > 0:01:38and the invention we're going to be looking at is...
0:01:38 > 0:01:40The speaker!
0:01:40 > 0:01:42Yeah, the speaker.
0:01:42 > 0:01:44We're going to make one that'll work for your iPod or MP3 player,
0:01:44 > 0:01:46- but that's not all. - Oh, no?
0:01:46 > 0:01:49No. We're then going to take my radically reinvented speaker
0:01:49 > 0:01:52and make it really big, and I reckon it'll be so good,
0:01:52 > 0:01:55it'll work for a live performance with a mega singer.
0:01:55 > 0:01:59Then, some expert judges will tell me whether they think it's good...
0:01:59 > 0:02:00ALL: Yeah!
0:02:00 > 0:02:01..or bad.
0:02:01 > 0:02:04ALL: Boo!
0:02:04 > 0:02:06This is going to be awesome!
0:02:06 > 0:02:08Oh, yeah!
0:02:11 > 0:02:14I show you how to make a speaker for your MP3 player,
0:02:14 > 0:02:16using stuff you'll have lying around.
0:02:16 > 0:02:17I run through a field,
0:02:17 > 0:02:21I get to grips with how sound works, or try to, anyway.
0:02:21 > 0:02:25I have no idea who these guys are, or what they're doing.
0:02:25 > 0:02:26There's a cow with a speaker in it,
0:02:26 > 0:02:29and I find a team to help build speakers for a star performer,
0:02:29 > 0:02:34but the big question is, will these bits of cardboard actually work?
0:02:34 > 0:02:35I'm scared!
0:02:38 > 0:02:41So, who do you think our speaker-testing singer is?
0:02:41 > 0:02:43Well, for a start,
0:02:43 > 0:02:45it's a lady - lady's mouth.
0:02:46 > 0:02:48No, she doesn't wear glasses!
0:02:48 > 0:02:49No, much prettier than that.
0:02:49 > 0:02:51Now, that's just weird!
0:02:51 > 0:02:53Normal eyes, please, not cat's eyes.
0:02:53 > 0:02:54Guessed who it is, yet?
0:02:54 > 0:03:00Yeah, you know it. She's an X Factor finalist. It's Kitty Brucknell!
0:03:00 > 0:03:02The speakers we're going to make have to be strong enough
0:03:02 > 0:03:05to hold up against Kitty's powerful voice,
0:03:05 > 0:03:07and she does give it some welly.
0:03:07 > 0:03:11# Oh, live and let die... #
0:03:11 > 0:03:13Woah, nice one, Kitty!
0:03:13 > 0:03:16Do you know, some singers can have such a loud and piercing tone
0:03:16 > 0:03:18that they can smash glass with their voice alone?
0:03:18 > 0:03:21But how does that happen?
0:03:23 > 0:03:25Apparently, it's all down to this.
0:03:25 > 0:03:27WINE GLASS RINGS
0:03:27 > 0:03:30That's resonance. It's the tone you need to make.
0:03:30 > 0:03:33But it's not just about the tone, it's also about the volume.
0:03:33 > 0:03:36Now, it's extremely difficult to do, and it's quite dangerous,
0:03:36 > 0:03:38so don't go trying this yourself.
0:03:38 > 0:03:40GLASS RINGS
0:03:40 > 0:03:45RICKY SINGS AT VARIOUS PITCHES
0:03:47 > 0:03:51RICKY SINGS AGAIN
0:03:51 > 0:03:54You know what? I don't think it's possible.
0:03:54 > 0:03:56Oh, hang on. What's this?
0:03:58 > 0:04:00JAIME SINGS
0:04:01 > 0:04:05Yes!
0:04:05 > 0:04:07Glass number 90!
0:04:07 > 0:04:10All right! But he's trained for years to do that.
0:04:10 > 0:04:12And he is an expert.
0:04:12 > 0:04:13Now, to break a glass,
0:04:13 > 0:04:16your voice has to be over a certain amount of decibels.
0:04:16 > 0:04:19Decibels are the way we measure sound.
0:04:19 > 0:04:22For example, (a pin drop, 15 decibels.)
0:04:24 > 0:04:27My voice, 50 decibels.
0:04:27 > 0:04:28TELEPHONE RINGS
0:04:28 > 0:04:3060 decibels.
0:04:30 > 0:04:31ENGINES ROAR
0:04:31 > 0:04:33120 decibels!
0:04:33 > 0:04:37Now, I think our speakers will reach about 80 decibels when...
0:04:37 > 0:04:39VOICEOVER: Kitty Brucknell!
0:04:39 > 0:04:44..performs. Which, according to my decibel meter, is about this loud!
0:04:46 > 0:04:48But it's those guys in the animal kingdom that have really
0:04:48 > 0:04:51smashed it when it comes to the decibel stakes.
0:04:51 > 0:04:52ELEPHANT TRUMPETS
0:04:52 > 0:04:56The loudest animal in the ocean is the blue whale,
0:04:56 > 0:04:59whose call can reach up to 188 decibels,
0:04:59 > 0:05:02and can be heard for hundreds of miles underwater.
0:05:02 > 0:05:05It's hard for us to hear it, though, as it's such a low frequency.
0:05:05 > 0:05:07There he goes!
0:05:07 > 0:05:11Shall we look at him again? Rewind, fold him up.
0:05:11 > 0:05:15Ah, there he is, swimming around. Through the desk. Oh! Gone.
0:05:15 > 0:05:18And you can find out how we did that on the website, by the way.
0:05:18 > 0:05:21Now, the loudest land animal is the howler monkey,
0:05:21 > 0:05:25who kicks up a right racket, and can be heard from three miles away.
0:05:26 > 0:05:30It's a bone in their throat that makes them so loud,
0:05:30 > 0:05:33as it acts like an amplifier.
0:05:33 > 0:05:38MONKEY HOWLS
0:05:38 > 0:05:39Shush, now, monkey!
0:05:40 > 0:05:42It's a very annoying noise.
0:05:42 > 0:05:46Another annoying noise is, of course, a burp. Excuse me.
0:05:46 > 0:05:49The loudest burp ever recorded was 109 decibels.
0:05:49 > 0:05:52My mate Laurie - that's him, he works on the show.
0:05:52 > 0:05:54He's got a disgustingly loud burp.
0:05:54 > 0:05:57He's going to have a go at breaking the record. Come on, Laurie!
0:05:57 > 0:05:59109 to beat.
0:05:59 > 0:06:00LAURIE BURPS
0:06:02 > 0:06:04Wow, that was, eugh!
0:06:04 > 0:06:06So, how loud was that?
0:06:06 > 0:06:09101.4 decibels. Not my best.
0:06:09 > 0:06:14Do you know, that isn't that bad, that's pretty good. Nice going.
0:06:14 > 0:06:17He's loud, but not as loud as the loudest sound on earth.
0:06:17 > 0:06:19That would be a volcanic eruption.
0:06:19 > 0:06:21Think of it as an earth burp.
0:06:21 > 0:06:24But even louder would be a meteorite hitting the Earth.
0:06:24 > 0:06:25Aaah!
0:06:25 > 0:06:27Nah, a big one.
0:06:27 > 0:06:28Yeah, that's better!
0:06:28 > 0:06:33In space, there is no air, so nothing for noise to travel through.
0:06:33 > 0:06:36(So all is quiet.)
0:06:36 > 0:06:40So all those explosions, bangs and laser noises you hear
0:06:40 > 0:06:42in those space movies when stuff gets blown up
0:06:42 > 0:06:44are all totally made up.
0:06:44 > 0:06:46Really, it'll be dead quiet.
0:06:46 > 0:06:48But not very exciting, though, eh?
0:06:48 > 0:06:50That's enough of all this. We've got speakers to make.
0:06:51 > 0:06:54But how do speakers work?
0:06:54 > 0:06:56OK, let's work with a cow.
0:06:56 > 0:06:59Let's put a speaker in it, there we are, give it some electricity,
0:06:59 > 0:07:00MP3 player will do.
0:07:00 > 0:07:03The speaker needs a copper coil surrounded by a magnet.
0:07:03 > 0:07:06When switched on, the electrical current travels to the copper coil.
0:07:06 > 0:07:11The magnet then makes the coil vibrate, which results in sound.
0:07:13 > 0:07:17I think we can make a speaker out of some old CD cases, magnets,
0:07:17 > 0:07:19copper-enamelled wire, a bit of sticky tape,
0:07:19 > 0:07:21and some headphone cable.
0:07:21 > 0:07:25Now, what I'm going to do is whack a little bit of glue
0:07:25 > 0:07:28on the top of this magnet here.
0:07:28 > 0:07:29And...
0:07:31 > 0:07:34Hang on a minute, I'm just going to go and work something out.
0:07:37 > 0:07:42So, what we're going to do is have the CD case here.
0:07:42 > 0:07:44'Ah, I know what you're thinking, but that's a special pen,
0:07:44 > 0:07:46'and a special van.
0:07:46 > 0:07:47'Not something to try yourself.'
0:07:56 > 0:07:57Hello, Morph!
0:08:03 > 0:08:05Oh!
0:08:07 > 0:08:08Ha-ha-ha!
0:08:12 > 0:08:13Ha-ha-ha!
0:08:22 > 0:08:23Uh-oh!
0:08:27 > 0:08:29Ta-dah!
0:08:29 > 0:08:31Ha-ha!
0:08:38 > 0:08:40Oh!
0:08:40 > 0:08:41BANG!
0:08:44 > 0:08:46Ha-ha-ha!
0:08:47 > 0:08:48Did you just hear something?
0:08:49 > 0:08:51Anyway, I've worked it out! Let's do it!
0:08:53 > 0:08:56But I'm not doing this on my own.
0:08:58 > 0:09:00I'm going to find me some helpful team-mates.
0:09:07 > 0:09:08Keys to your Gran's house,
0:09:08 > 0:09:11Mr Chicken, the tea cosy,
0:09:11 > 0:09:13gravy granules, or a guitar.
0:09:20 > 0:09:22Usually some laying around somewhere.
0:09:22 > 0:09:23Oh, yeah, some scissors.
0:09:26 > 0:09:29An old envelope, or a new one, I'm not really bothered,
0:09:29 > 0:09:30it's entirely up to you.
0:09:32 > 0:09:34Here we go, then. Step one.
0:09:34 > 0:09:37Right, the first thing you need to do is grab your copper wire
0:09:37 > 0:09:39and wind it around something cylindrical.
0:09:39 > 0:09:41About 40 turns should do it.
0:09:41 > 0:09:44Then carefully pull it off, and fasten it tightly with some
0:09:44 > 0:09:47sticky tape, and it should end up looking like this.
0:09:48 > 0:09:51The next thing you need to do is grab your CD case,
0:09:51 > 0:09:53and stick a magnet to one side.
0:09:57 > 0:09:59Now, take your envelope, cut off its corner,
0:09:59 > 0:10:03and then cut off ITS corner,
0:10:03 > 0:10:08creating a cone that'll work as a speaker's resonator.
0:10:10 > 0:10:13Next, you need to stick your coil to the top of the resonator,
0:10:13 > 0:10:16and you do this just by looping over a little bit of sticky tape.
0:10:17 > 0:10:20Then, grab some more tape
0:10:20 > 0:10:25and fold it back on itself so it's sticky on the outside.
0:10:26 > 0:10:30And put that on top of the magnet in the CD case.
0:10:30 > 0:10:34Now, you can stick your coil and your resonator on top of that.
0:10:36 > 0:10:39Sand the ends of your coil and sand the ends of the MP3 wire,
0:10:39 > 0:10:41twisting together,
0:10:41 > 0:10:44connect that to your MP3 player, and now it's time to rock.
0:10:58 > 0:10:59Ha-ha-ha!
0:11:05 > 0:11:06Oh!
0:11:08 > 0:11:09Uh-oh!
0:11:18 > 0:11:20We find out how loud our speakers are,
0:11:20 > 0:11:21I go for a low-frequency snack.
0:11:21 > 0:11:23Oooh! That's got to hurt!
0:11:23 > 0:11:25I phone an old friend,
0:11:25 > 0:11:27not everything goes to plan.
0:11:27 > 0:11:29Come on, everyone, we're running out of time!
0:11:29 > 0:11:33And we see if my radical reinvention actually works.
0:11:37 > 0:11:40So, it's the moment you guys have all been waiting for.
0:11:40 > 0:11:42It's time to test out those speakers. You guys ready?
0:11:42 > 0:11:44KIDS: Yeah.
0:11:45 > 0:11:46QUIET MUSIC PLAYS
0:11:48 > 0:11:50That is actually coming from the speaker!
0:11:51 > 0:11:53That's so cool!
0:11:53 > 0:11:54Oh, amazing!
0:11:56 > 0:11:57That's coolsome!
0:11:57 > 0:11:59That's so coolsome!
0:11:59 > 0:12:01Yeah, that's cool.
0:12:01 > 0:12:07We need it to be over 80 decibels, and at the moment, it's about 60.
0:12:07 > 0:12:10Now, there's one other thing I haven't told you.
0:12:10 > 0:12:12It's that we need these speakers to be loud
0:12:12 > 0:12:13and good enough for a performance,
0:12:13 > 0:12:16because we've got a guest coming along to sing through them.
0:12:16 > 0:12:19And it's X Factor finalist, Kitty Brucknell.
0:12:19 > 0:12:21- What? No, it isn't!- It is.
0:12:21 > 0:12:24- She won't come.- She is coming!
0:12:24 > 0:12:25She's not!
0:12:26 > 0:12:28Kitty is definitely coming later to sing for you,
0:12:28 > 0:12:30through the speakers that you're going to make.
0:12:30 > 0:12:34- Really?- Yes, she is.- No, she's not! - She is!- She's not coming!
0:12:34 > 0:12:36- She is coming!- She's not! - No, she's not!
0:12:36 > 0:12:39All right, then I'll just call her.
0:12:39 > 0:12:42- Ricky, give her a call. - Call her, then.- Call her, then.
0:12:42 > 0:12:43PHONE RINGS
0:12:43 > 0:12:46- Hello?- Hello, Kitty, it's Ricky.
0:12:46 > 0:12:49- Hi, Ricky!- You still up for coming to play for us later?
0:12:49 > 0:12:52Oh, absolutely, I can't wait! It's going to be so much fun.
0:12:52 > 0:12:53Bye, Kitty, bye!
0:12:54 > 0:12:55It is her!
0:12:55 > 0:12:57You guys are going to be helping me
0:12:57 > 0:12:59make the speakers that she's going to play through.
0:12:59 > 0:13:00Do you think we're up for the job?
0:13:00 > 0:13:02ALL: Yeah!
0:13:02 > 0:13:04- Are the speakers up to the job? - ALL: No!
0:13:04 > 0:13:07In that case, I'm going to need some expert advice.
0:13:08 > 0:13:11I think the speakers will be good enough
0:13:11 > 0:13:13if we make them bigger, but they're not at the minute.
0:13:13 > 0:13:14They're not loud enough.
0:13:15 > 0:13:17They're pretty useless,
0:13:17 > 0:13:21unless everyone in the crowd held one up to their ear.
0:13:21 > 0:13:23If we make them bigger, and a bigger magnet,
0:13:23 > 0:13:25they'll probably be good enough.
0:13:27 > 0:13:31This is the Acoustic Transducer Company. Sounds good.
0:13:31 > 0:13:34These guys make 1500 speakers a year.
0:13:34 > 0:13:36They supply to over 60 countries,
0:13:36 > 0:13:39and have kitted out the studios of Pink Floyd, Lenny Kravitz,
0:13:39 > 0:13:42The Rolling Stones and other people your mum and dad have listened to.
0:13:43 > 0:13:46Their production line isn't too different from ours.
0:13:46 > 0:13:48They have people doing all the hard work for them,
0:13:48 > 0:13:50I have people doing all the hard work for me.
0:13:50 > 0:13:56We wind copper coils, they wind copper coils with a fancy machine.
0:13:56 > 0:13:59They have wires, and we've got wires, too.
0:13:59 > 0:14:02We've got magnets, they've got magnets,
0:14:02 > 0:14:03just slightly bigger than ours.
0:14:03 > 0:14:07Their speakers can cost up to £30,000,
0:14:07 > 0:14:10and our speakers don't really cost that much,
0:14:10 > 0:14:13but the thing they do have that we don't is a speaker tester.
0:14:13 > 0:14:15When you crank the bass down,
0:14:15 > 0:14:17the vibrations make the speaker cone bounce.
0:14:17 > 0:14:20And if you add an extra ingredient, you can have a whole lot of fun!
0:14:25 > 0:14:27Right, so how can we improve this for our performance?
0:14:27 > 0:14:30Because we really want it to reach over 80 decibels.
0:14:30 > 0:14:32You've got some powerful magnets, but you could try
0:14:32 > 0:14:35arranging them so that they focus the energy closer to the voice coil.
0:14:35 > 0:14:36And this tape, here.
0:14:36 > 0:14:39You could try something more flexible in place of that,
0:14:39 > 0:14:43to allow more movement, maybe elastic bands or a balloon.
0:14:43 > 0:14:45If you were to put a horn in front of the cone,
0:14:45 > 0:14:46that would make it louder.
0:14:46 > 0:14:47Cool.
0:14:47 > 0:14:50Ben and Rich are going to be on hand to help me
0:14:50 > 0:14:51at the big performance later on.
0:14:51 > 0:14:55So, our top tips from the experts are,
0:14:55 > 0:14:58use a balloon instead of sticky tape to put the cone on,
0:14:58 > 0:14:59arrange the magnets better,
0:14:59 > 0:15:00and add a horn.
0:15:00 > 0:15:02HORN TOOTS
0:15:02 > 0:15:04Not that kind of horn!
0:15:04 > 0:15:07Yeah, that shape, anyway. These are going to be much better.
0:15:29 > 0:15:31CRASH!
0:15:31 > 0:15:32Huh?!
0:15:43 > 0:15:46I hope Kitty's going to be OK with what we make for her.
0:15:46 > 0:15:47It's much harder than I thought.
0:15:47 > 0:15:50I really take my hat off to the guy that first invented the speaker.
0:15:50 > 0:15:53His name was Alexander Graham Bell,
0:15:53 > 0:15:56and he's the same guy that invented the telephone.
0:15:56 > 0:15:59I wonder if he knows he invented the speaker at the same time.
0:15:59 > 0:16:00I'll just give him a call.
0:16:03 > 0:16:04PHONE RINGS
0:16:04 > 0:16:05It's ringing.
0:16:05 > 0:16:08Hello, is that Alexander?
0:16:08 > 0:16:10- Yes.- Hi, Alex.
0:16:10 > 0:16:11Oh, shall I call you Mr Bell?
0:16:11 > 0:16:14No, you can call me Alex.
0:16:14 > 0:16:15Oh, all right then, Al.
0:16:15 > 0:16:17Did you know that you invented the first loudspeaker
0:16:17 > 0:16:19when you invented your telephone?
0:16:19 > 0:16:22- Did I really? - Yes, you did.
0:16:22 > 0:16:25- So, er, well done. - Thank you.
0:16:25 > 0:16:28- That's all right. Cheers, then. - Bye, now.
0:16:30 > 0:16:34I'm so stoked that I invented the speaker at the same time
0:16:34 > 0:16:35as I invented the...
0:16:35 > 0:16:37(MUFFLED) ..telephone.
0:16:37 > 0:16:39You know what? It's not just speakers that need magnets to work.
0:16:39 > 0:16:41We do, too. It may sound radical,
0:16:41 > 0:16:44but the fact is our planet has one big mega-magnet
0:16:44 > 0:16:48running inside it from the North to the South Pole,
0:16:48 > 0:16:50and the magnetic field it creates goes out into space
0:16:50 > 0:16:52for thousands of kilometres. It acts like a force field,
0:16:52 > 0:16:54protecting us from space radiation,
0:16:54 > 0:16:56but if the Earth lost this mega-magnet,
0:16:56 > 0:16:59the whole world would go a bit wonky.
0:16:59 > 0:17:03So, you'd be walking along, looking at your map,
0:17:03 > 0:17:06you'd get your compass out and, oh, no!
0:17:06 > 0:17:07It wouldn't work.
0:17:07 > 0:17:09So... Oh! Where did that come from?
0:17:10 > 0:17:12Yep, you'd be lost.
0:17:12 > 0:17:15Oh, someone should probably fix that.
0:17:15 > 0:17:17Birds use the magnetism of the Earth to find their way, too,
0:17:17 > 0:17:19so without it... Oh!
0:17:19 > 0:17:21Oh, hello!
0:17:21 > 0:17:23They wouldn't know where they were going, either.
0:17:23 > 0:17:27And, no magnetism, no protection from the Sun's solar winds.
0:17:27 > 0:17:30So we'd all get cooked.
0:17:30 > 0:17:32Yeah, and so would the birds.
0:17:32 > 0:17:33What a disaster.
0:17:35 > 0:17:40OK, so, big speakers, not going to be a disaster.
0:17:40 > 0:17:43I'm taking my expert tips back to my top team.
0:17:45 > 0:17:48Come on, guys, we've got a lot to do. Let's get on it.
0:17:48 > 0:17:50'I've stuck the magnets on already, because
0:17:50 > 0:17:53'if you get your fingers caught between them, it don't half pinch!
0:17:53 > 0:17:56'We're having more winds of the coil this time,
0:17:56 > 0:17:58'so first job is to get winding.'
0:18:04 > 0:18:07BOTH: ..69, 70!
0:18:08 > 0:18:09Amazing!
0:18:13 > 0:18:16Our top tip from the experts was to use balloons to just bend
0:18:16 > 0:18:18the coil over the magnet, instead of using tape.
0:18:18 > 0:18:22But things are starting to go wrong.
0:18:22 > 0:18:23Oh, no!
0:18:23 > 0:18:25And balloons splitting isn't all.
0:18:25 > 0:18:28I've just realised the bolts are slightly too high.
0:18:28 > 0:18:30The coil needs to be really close to the magnet,
0:18:30 > 0:18:31and at the moment, it's quite far away.
0:18:31 > 0:18:35So that's nearly 50 screws all needing to be redone.
0:18:37 > 0:18:40We are really up against it now, and me making this little blunder here
0:18:40 > 0:18:43has not helped us, so we're going to have to start making the cones now.
0:18:47 > 0:18:50Well, it's nice to see everyone pulling their weight(!)
0:18:50 > 0:18:53I don't think they realise how little time we have left!
0:18:57 > 0:18:59Do you know, I have absolutely no idea
0:18:59 > 0:19:01whether this is going to work or not.
0:19:02 > 0:19:04It will probably work. It might not, though.
0:19:06 > 0:19:09No, it's going to work. It might not work.
0:19:11 > 0:19:12We're on the last little bit now.
0:19:12 > 0:19:15What we need to do is just cut out these bits,
0:19:15 > 0:19:18and then fold them in like this, so you get this kind of shape.
0:19:18 > 0:19:20If you work in a team, that would be great,
0:19:20 > 0:19:22but really, we've just got to get them cut!
0:19:25 > 0:19:26While we crack on,
0:19:26 > 0:19:29the hall is being prepared for the performance of our star guest.
0:19:30 > 0:19:33Come on, everyone! We're running out of time!
0:19:33 > 0:19:35I'm glad to see some expert help arrive.
0:19:45 > 0:19:47So, is bigger better? Do they actually work?
0:19:49 > 0:19:51MUSIC PLAYS
0:19:51 > 0:19:52Both working.
0:19:53 > 0:19:57- That's not bad.- That's really good. - That's really good.
0:19:57 > 0:20:00- Guys, how do you feel about this? - Yeah, good.- Is it going to work?
0:20:00 > 0:20:03- KIDS: Yeah! - I like the optimism.
0:20:04 > 0:20:07Everyone's feeling good, but with minutes to go,
0:20:07 > 0:20:10we need to get the horns on the speakers and set them up on stage.
0:20:10 > 0:20:12They may not look pretty,
0:20:12 > 0:20:16but it's what they sound like that matters, and it's not sounding good.
0:20:16 > 0:20:18You can't hear me, can you?
0:20:18 > 0:20:21No, because they don't seem to be working at the moment.
0:20:21 > 0:20:24We're having a problem getting them ready. I'm scared!
0:20:24 > 0:20:27Everything's riding on these speakers working.
0:20:27 > 0:20:30Just as well the experts are here to help work this out.
0:20:30 > 0:20:33They've also brought along their professional speakers,
0:20:33 > 0:20:35in case it all goes wrong.
0:20:35 > 0:20:37Fingers crossed they've fixed the problem,
0:20:37 > 0:20:39Tess is going to try them out.
0:20:39 > 0:20:41# Who do you think you are
0:20:41 > 0:20:43# Running round leaving scars... #
0:20:43 > 0:20:45Thank goodness for that! They're working.
0:20:45 > 0:20:47# And tearing love apart... #
0:20:49 > 0:20:50Well done, Tess.
0:20:50 > 0:20:52'Nice one, Tess!'
0:20:55 > 0:20:57How do you guys think it sounded?
0:20:57 > 0:20:58They sound a bit fuzzy.
0:20:58 > 0:21:00When we put music through it, it sounds a lot better.
0:21:00 > 0:21:03I think we've just got to do it and hope for the best, haven't we?
0:21:03 > 0:21:04KIDS: Yeah.
0:21:06 > 0:21:10Inside, the audience are filing in, unaware that outside,
0:21:10 > 0:21:12Kitty has just arrived.
0:21:17 > 0:21:19We've got our speakers plugged in to a mixing desk and an amp.
0:21:19 > 0:21:22We've got to be really careful about how much power we put into it,
0:21:22 > 0:21:25because it could blow, and that would be a disaster.
0:21:25 > 0:21:27Because what could happen is,
0:21:27 > 0:21:28in an effort to make our speakers louder,
0:21:28 > 0:21:30we give them more power than they can handle.
0:21:30 > 0:21:34If we reach this limit, the coils will get hot, really hot.
0:21:34 > 0:21:36The glue could melt,
0:21:36 > 0:21:39and the speakers might destroy themselves, and we don't want that.
0:21:47 > 0:21:48There's no turning back now.
0:21:48 > 0:21:52250 judges are about to hear how our speakers sound.
0:21:52 > 0:21:53Hi guys, can you hear me?
0:21:53 > 0:21:55AUDIENCE: Yeah.
0:21:55 > 0:21:57That's great. I'm talking through speakers that me
0:21:57 > 0:21:59and my team radically reinvented,
0:21:59 > 0:22:01and we're pretty confident they're going to hold up
0:22:01 > 0:22:04to a powerful performance, so please put your hands together
0:22:04 > 0:22:07and give a big, warm welcome to Kitty Brucknell!
0:22:07 > 0:22:09AUDIENCE CHEER
0:22:17 > 0:22:20# There ain't no reason you and me
0:22:20 > 0:22:22# Should be alone tonight
0:22:22 > 0:22:24# Yeah, baby, tonight. #
0:22:24 > 0:22:26Let's just make this clear.
0:22:26 > 0:22:29Kitty Brucknell is singing through some cardboard boxes,
0:22:29 > 0:22:32balloons, wires and magnets, and it's working!
0:22:32 > 0:22:35But are they reaching our target of 80 decibels?
0:22:35 > 0:22:38Oh, yeah! 85 on the meter.
0:22:38 > 0:22:39# I'm going to run right to
0:22:39 > 0:22:42# To the edge with you
0:22:42 > 0:22:44# Where we can both fall over in love... #
0:22:44 > 0:22:45We've hit our target, but just in time,
0:22:45 > 0:22:48because what I feared might happen is happening.
0:22:48 > 0:22:51Kitty's putting so much power through the speakers,
0:22:51 > 0:22:53the coils are overheating!
0:22:53 > 0:22:55# I'm on the edge, the edge
0:22:55 > 0:22:58# The edge, the edge
0:22:58 > 0:23:00# The edge, the edge
0:23:00 > 0:23:02# The edge
0:23:02 > 0:23:04# I'm on the edge with you. #
0:23:12 > 0:23:16'For safety's sake, we can't use these again. But they did work.
0:23:16 > 0:23:17'So, what's the verdict?'
0:23:17 > 0:23:21Give me a shout if you think Ricky's radical reinvention
0:23:21 > 0:23:23of the speakers worked!
0:23:23 > 0:23:25KIDS SHOUT
0:23:26 > 0:23:29That's a big yes from the judges!
0:23:29 > 0:23:34The speakers worked. Job done. They're a bit too hot to handle now.
0:23:34 > 0:23:38Just as well we've got the big ones. Take it away, Kitty!
0:23:38 > 0:23:42# I'm on the edge of glory
0:23:42 > 0:23:46# And I'm hanging on a moment of truth
0:23:46 > 0:23:49# Out on the edge of glory
0:23:49 > 0:23:53# And I'm hanging on a moment with you
0:23:53 > 0:23:55# I'm on the edge, the edge
0:23:55 > 0:23:57# The edge, the edge
0:23:57 > 0:23:59# The edge, the edge
0:23:59 > 0:24:01# The edge
0:24:01 > 0:24:05# I'm on the edge of glory
0:24:05 > 0:24:10# And I'm hanging on a moment with you
0:24:10 > 0:24:11# I'm on the edge with you
0:24:19 > 0:24:22# I'm on the edge of glory... #
0:24:22 > 0:24:23Phew!
0:24:23 > 0:24:26Right, so you guys now know how to make a speaker
0:24:26 > 0:24:28using some copper wire, some magnets and other bits and bobs.
0:24:28 > 0:24:32I'm really, really stoked that our speakers made over 85 decibels.
0:24:32 > 0:24:34I think we really smashed it this time.
0:24:34 > 0:24:36# I'm on the edge, the edge
0:24:36 > 0:24:38# The edge, the edge
0:24:38 > 0:24:41# The edge, the edge
0:24:41 > 0:24:42# The edge
0:24:42 > 0:24:46# I'm on the edge of glory
0:24:46 > 0:24:50# And I'm hanging on a moment with you
0:24:50 > 0:24:52# With you... #
0:24:52 > 0:24:55Kitty singing through our speakers was absolutely amazing.
0:24:56 > 0:24:58# I'm on the edge with you... #
0:24:58 > 0:25:00I didn't expect them to be that loud.
0:25:00 > 0:25:05The best bit was when Kitty sang through the speakers.
0:25:05 > 0:25:08It was so fun!
0:25:08 > 0:25:11Kitty singing was amazing, and it went down really well.
0:25:11 > 0:25:13I'm quite upset that it's the end of it now.
0:25:13 > 0:25:16It was really fun, but I really want to do it again now!
0:25:16 > 0:25:19# Yeah, yeah
0:25:19 > 0:25:23# I'm on the edge with you. #
0:25:25 > 0:25:29A great performance by Kitty, and a great achievement by the team.
0:25:29 > 0:25:32Those speakers were a radical reinvention that really rocked.
0:25:35 > 0:25:39Want to make your own speakers? Check out the website.
0:25:52 > 0:25:55Subtitles by Red Bee Media Ltd