All language subtitles for S28E03 - Angle Grinders; Berry Baskets; Omnidirectional Speakers (1080p AMZN WEB-DL x265 Garshasp)_track4_[eng]

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These are the user uploaded subtitles that are being translated: 1 00:00:02,137 --> 00:00:05,103 --captions by vitac-- Www.Vitac.Com 2 00:00:05,103 --> 00:00:08,103 Captions paid for by Discovery communications 3 00:00:53,241 --> 00:00:55,413 Narrator: the angle grinder Created a major buzz 4 00:00:55,413 --> 00:00:57,241 In the workplace When it was developed 5 00:00:57,241 --> 00:00:59,758 In the middle Of the 20th century. 6 00:00:59,758 --> 00:01:01,689 This power tool Could do it all -- 7 00:01:01,689 --> 00:01:05,413 Cut, grind, and polish Metal or stone. 8 00:01:05,413 --> 00:01:07,517 Just change the disk Or brush attachment 9 00:01:07,517 --> 00:01:09,000 To match the job, 10 00:01:09,000 --> 00:01:11,413 And work gets done Automatically. 11 00:01:14,206 --> 00:01:16,310 With numerous Attachments available, 12 00:01:16,310 --> 00:01:17,448 The angle grinder 13 00:01:17,448 --> 00:01:19,448 Could be equipped For many different jobs. 14 00:01:19,448 --> 00:01:21,862 That makes it one Of the most useful things 15 00:01:21,862 --> 00:01:24,586 On any job site. 16 00:01:24,586 --> 00:01:26,620 Making angle grinders starts 17 00:01:26,620 --> 00:01:30,413 With these blocks Of pure aluminum. 18 00:01:30,413 --> 00:01:31,724 Fired in a furnace, 19 00:01:31,724 --> 00:01:35,758 The aluminum melts Into a liquid form. 20 00:01:35,758 --> 00:01:38,068 The factory casts The molten aluminum 21 00:01:38,068 --> 00:01:40,310 To create gear housings. 22 00:01:42,551 --> 00:01:44,931 A robot transfers One of the gear housings 23 00:01:44,931 --> 00:01:48,068 To a milling station 24 00:01:48,068 --> 00:01:50,448 And then retrieves A finished part. 25 00:01:53,482 --> 00:01:55,758 The door of the machine closes, 26 00:01:55,758 --> 00:01:57,896 And a computerized cutter Carves threads 27 00:01:57,896 --> 00:02:00,137 Into the center bearing seat 28 00:02:00,137 --> 00:02:03,172 And generally improves The profile of the part. 29 00:02:06,413 --> 00:02:10,103 Next up is the rotor For the electric motor. 30 00:02:10,103 --> 00:02:13,517 An automated system pushes Special cardboard end disks 31 00:02:13,517 --> 00:02:16,517 Onto the rotor shaft. 32 00:02:16,517 --> 00:02:20,551 The part on the right Is equipped with end disks. 33 00:02:20,551 --> 00:02:23,379 The system now installs a part 34 00:02:23,379 --> 00:02:26,241 Called the collector on one end. 35 00:02:26,241 --> 00:02:27,827 Made of copper and plastic, 36 00:02:27,827 --> 00:02:30,827 The collector will transmit Power to the rotor 37 00:02:30,827 --> 00:02:33,103 And ensure that the grinding Or polishing attachment 38 00:02:33,103 --> 00:02:34,241 Can turn. 39 00:02:37,448 --> 00:02:42,241 The part on the right Has had the collector installed. 40 00:02:42,241 --> 00:02:44,482 Spinning arms wind copper wire 41 00:02:44,482 --> 00:02:47,379 Into grooves in the rotor At both ends. 42 00:02:47,379 --> 00:02:50,275 The wire will serve As an electromagnet 43 00:02:50,275 --> 00:02:52,344 And maximize power output. 44 00:02:55,413 --> 00:02:58,034 Moving forward, The system inserts covers 45 00:02:58,034 --> 00:03:01,310 Into slots in the rotor wall. 46 00:03:01,310 --> 00:03:03,000 They both insulate the rotor 47 00:03:03,000 --> 00:03:05,482 And stabilize the copper coil. 48 00:03:05,482 --> 00:03:07,862 Spinning devices Wrap copper wire 49 00:03:07,862 --> 00:03:10,241 Around each half of the stater. 50 00:03:10,241 --> 00:03:12,724 This stater creates The electromagnetic field 51 00:03:12,724 --> 00:03:14,068 Around the rotor. 52 00:03:16,068 --> 00:03:17,862 A robot puts the two halves 53 00:03:17,862 --> 00:03:20,241 Of the stater Together in a fixture, 54 00:03:20,241 --> 00:03:22,724 And welds make The assembly permanent. 55 00:03:29,689 --> 00:03:32,137 Over to an injection Molding machine now, 56 00:03:32,137 --> 00:03:37,241 It forms plastic into outer Casings for the grinder. 57 00:03:37,241 --> 00:03:41,241 A robot transfers the casing To a platform for printing. 58 00:03:41,241 --> 00:03:45,068 This stamp adds silver ink To the embossed company logo, 59 00:03:45,068 --> 00:03:47,241 Giving it greater visual appeal. 60 00:03:49,241 --> 00:03:54,000 A worker then slides the plastic Housing over the stater, 61 00:03:54,000 --> 00:03:57,172 And a pneumatic machine Press-fits the two together. 62 00:03:59,965 --> 00:04:02,172 The worker then wires The on/off switch 63 00:04:02,172 --> 00:04:04,172 For the angle grinder. 64 00:04:06,241 --> 00:04:08,482 The gear housing has, By now, been equipped 65 00:04:08,482 --> 00:04:11,103 With a drive gear and brake. 66 00:04:11,103 --> 00:04:14,206 He installs the gear system On one end of the rotor. 67 00:04:16,413 --> 00:04:19,344 He then inserts the rotor Assembly in the stater. 68 00:04:23,344 --> 00:04:25,827 An automated system Screws everything together 69 00:04:25,827 --> 00:04:30,137 To complete The angle grinder motor. 70 00:04:30,137 --> 00:04:35,000 Next, a nozzle fills The gear head with grease. 71 00:04:35,000 --> 00:04:36,551 A worker places the spindle 72 00:04:36,551 --> 00:04:39,724 And safety clutch Over the gear head, 73 00:04:39,724 --> 00:04:42,482 And a mechanized system Screws it in place. 74 00:04:49,275 --> 00:04:50,896 She then wires The electrical plug 75 00:04:50,896 --> 00:04:52,931 To the angle grinder motor. 76 00:05:01,172 --> 00:05:04,586 She encloses the electrical Wiring with a plastic cover. 77 00:05:09,172 --> 00:05:11,551 She locks the cover In places with screws, 78 00:05:11,551 --> 00:05:14,344 Using a metal template To aid in their placement. 79 00:05:19,000 --> 00:05:20,241 This angle grinder 80 00:05:20,241 --> 00:05:25,034 Is now ready to undergo Quality control tests. 81 00:05:25,034 --> 00:05:27,379 This one depresses The angle grinder switch, 82 00:05:27,379 --> 00:05:28,965 While a computerized system 83 00:05:28,965 --> 00:05:33,068 Analyzes the motor's Performance. 84 00:05:33,068 --> 00:05:34,862 If it passes all the tests, 85 00:05:34,862 --> 00:05:37,206 The angle grinder Is ready to take a chunk 86 00:05:37,206 --> 00:05:39,068 Out of someone's workload. 87 00:05:50,137 --> 00:05:52,344 Narrator: long before The development of pottery, 88 00:05:52,344 --> 00:05:56,206 People looked to the forest For containment materials. 89 00:05:56,206 --> 00:05:59,965 They made berry baskets From the bark of birch trees. 90 00:05:59,965 --> 00:06:02,482 The baskets were Lightweight and waterproof, 91 00:06:02,482 --> 00:06:04,965 Due to natural Resins in the bark. 92 00:06:04,965 --> 00:06:06,310 The making of these baskets 93 00:06:06,310 --> 00:06:08,448 Is a tradition that carries on. 94 00:06:11,896 --> 00:06:13,827 For containing nature's bounty, 95 00:06:13,827 --> 00:06:16,586 Birch bark is a natural choice. 96 00:06:16,586 --> 00:06:18,793 This berry basket Is made entirely 97 00:06:18,793 --> 00:06:22,034 From materials found in nature. 98 00:06:22,034 --> 00:06:23,965 Making one starts With birch bark 99 00:06:23,965 --> 00:06:26,172 That's been carefully Pried off the tree 100 00:06:26,172 --> 00:06:29,379 To avoid damage To the inner layer of bark. 101 00:06:29,379 --> 00:06:32,586 This cardboard pattern Will be used as a template. 102 00:06:34,793 --> 00:06:36,827 The basket maker Examines the bark 103 00:06:36,827 --> 00:06:40,000 For any holes or serious flaws. 104 00:06:40,000 --> 00:06:41,793 He flips the bark over. 105 00:06:41,793 --> 00:06:45,517 He'll use the inner side For the outside of the basket. 106 00:06:48,965 --> 00:06:50,448 He traces around the pattern, 107 00:06:50,448 --> 00:06:54,206 Using a scribe that Lightly scores the bark. 108 00:06:54,206 --> 00:06:57,793 This light scoring creates A visible outline on the bark. 109 00:07:00,965 --> 00:07:02,931 Using scissors For cutting leather, 110 00:07:02,931 --> 00:07:04,586 He follows the pattern lines 111 00:07:04,586 --> 00:07:08,689 To cut the bark To the pattern shape. 112 00:07:08,689 --> 00:07:10,689 The contours Are harder to follow, 113 00:07:10,689 --> 00:07:12,241 So he switches to scissors 114 00:07:12,241 --> 00:07:16,034 With curved blades To cut them out. 115 00:07:16,034 --> 00:07:18,758 He punches holes In the basket corners. 116 00:07:18,758 --> 00:07:21,344 This will stop the bark From splitting in these spots 117 00:07:21,344 --> 00:07:22,689 When it's folded. 118 00:07:24,689 --> 00:07:27,310 Using a pointed instrument Known as a divider, 119 00:07:27,310 --> 00:07:31,862 He now etches stitch lines Around the perimeter. 120 00:07:31,862 --> 00:07:34,482 He maps out the location For the stitch holes 121 00:07:34,482 --> 00:07:38,103 By lightly piercing the bark Along the etched lines. 122 00:07:40,862 --> 00:07:42,758 Using a ruler for support, 123 00:07:42,758 --> 00:07:45,172 He bends the flaps Of the pattern up, 124 00:07:45,172 --> 00:07:48,551 Creating creases that will Become permanent folds later. 125 00:07:52,758 --> 00:07:54,172 He punches out stitch holes 126 00:07:54,172 --> 00:07:56,379 Where he had lightly Pierced the bark. 127 00:08:01,620 --> 00:08:03,896 He drapes a damp towel Over the birch bark 128 00:08:03,896 --> 00:08:07,068 And irons it. 129 00:08:07,068 --> 00:08:09,896 This softens the bark So that it doesn't split 130 00:08:09,896 --> 00:08:13,551 As he now forms the final bends Along the crease lines. 131 00:08:16,620 --> 00:08:18,931 He overlaps the ends Of the basket. 132 00:08:18,931 --> 00:08:20,931 He clips the structure To hold it together 133 00:08:20,931 --> 00:08:24,344 While he inserts wooden dowels In some of the stitch holes. 134 00:08:26,965 --> 00:08:30,931 Once the dowels are in, He removes the clips. 135 00:08:30,931 --> 00:08:34,827 The dowels will keep the basket Together for stitching. 136 00:08:34,827 --> 00:08:36,724 But first, he tapers the stem 137 00:08:36,724 --> 00:08:40,172 From a willow shrub Using a wood plane. 138 00:08:40,172 --> 00:08:42,896 He inserts the stem In a cylindrical container 139 00:08:42,896 --> 00:08:46,758 And fills the cylinder With hot water. 140 00:08:46,758 --> 00:08:49,517 The tapered stem Soaks overnight. 141 00:08:49,517 --> 00:08:53,379 It softens and becomes Extremely flexible. 142 00:08:53,379 --> 00:08:57,724 Using a wooden form, He shapes the stem into a ring. 143 00:08:57,724 --> 00:09:00,482 The tapered ends overlap For a consistent thickness 144 00:09:00,482 --> 00:09:02,241 All the way around. 145 00:09:05,206 --> 00:09:08,241 He clips the ring To the inner rim of the basket 146 00:09:08,241 --> 00:09:12,689 And also tacks it in place With a few stitches. 147 00:09:12,689 --> 00:09:14,551 This willow ring Will add support 148 00:09:14,551 --> 00:09:16,482 To the lip of the berry basket. 149 00:09:19,724 --> 00:09:22,448 Next, he stitches The seams together 150 00:09:22,448 --> 00:09:25,724 Using the root of a spruce tree For thread. 151 00:09:25,724 --> 00:09:29,931 Its tapered tip serves As a needle. 152 00:09:29,931 --> 00:09:31,724 He does precise backstitches 153 00:09:31,724 --> 00:09:34,172 And ensures all The seams are tight. 154 00:09:38,896 --> 00:09:41,310 Moving back to the rim Of the basket, 155 00:09:41,310 --> 00:09:44,862 He punctures the bark Just below the willow ring, 156 00:09:44,862 --> 00:09:46,172 Creating a row of holes 157 00:09:46,172 --> 00:09:48,206 To loop the root Around the rim. 158 00:09:51,827 --> 00:09:54,655 This spruce root wrap Protects the rim ring, 159 00:09:54,655 --> 00:09:57,724 And gives the basket A more finished look at the top. 160 00:10:02,724 --> 00:10:04,586 He slices a piece of cedar bark 161 00:10:04,586 --> 00:10:06,862 Into long, narrow strips. 162 00:10:09,103 --> 00:10:12,275 He'll use these strips to make A handle for the basket. 163 00:10:14,793 --> 00:10:18,310 He weaves the cedar Into a five-strand braid. 164 00:10:21,896 --> 00:10:24,137 He loops the cedar Braid at the ends 165 00:10:24,137 --> 00:10:26,206 And uses the loops To stitch the handle 166 00:10:26,206 --> 00:10:27,689 To the berry basket. 167 00:10:31,655 --> 00:10:33,551 It takes this artisan About a day 168 00:10:33,551 --> 00:10:36,275 To craft a birch bark Berry basket. 169 00:10:39,965 --> 00:10:41,413 His efforts will no doubt 170 00:10:41,413 --> 00:10:44,344 Bear fruit For many years to come. 171 00:10:58,206 --> 00:11:00,758 Narrator: choosing the right Speakers for your sound system 172 00:11:00,758 --> 00:11:04,482 Depends on how you prefer To hear music. 173 00:11:04,482 --> 00:11:09,241 Unidirectional speakers radiate Sound in a single direction. 174 00:11:09,241 --> 00:11:12,344 Omnidirectional speakers radiate In all directions, 175 00:11:12,344 --> 00:11:15,379 So the sound bounces Off the ceiling and walls. 176 00:11:18,448 --> 00:11:22,000 This omnidirectional speaker System has four towers -- 177 00:11:22,000 --> 00:11:26,379 Two main system towers And two subwoofer towers. 178 00:11:26,379 --> 00:11:28,103 The towers contain the drivers 179 00:11:28,103 --> 00:11:32,103 That radiate sound frequencies Out of the speaker. 180 00:11:32,103 --> 00:11:34,655 This computer-guided mill Shapes brass sheets 181 00:11:34,655 --> 00:11:38,413 Into mounting plates For the main system towers. 182 00:11:38,413 --> 00:11:42,310 Each of the main system towers Contains six drivers -- 183 00:11:42,310 --> 00:11:46,724 Two tweeters, two mid-ranges, And two woofers. 184 00:11:46,724 --> 00:11:49,103 Each subwoofer tower Contains six drivers 185 00:11:49,103 --> 00:11:53,103 For the lowest human Audible frequencies. 186 00:11:53,103 --> 00:11:55,827 After the brass mounting plate Comes off the mill, 187 00:11:55,827 --> 00:11:58,172 Workers grind The top surface smooth 188 00:11:58,172 --> 00:12:00,862 To prepare it for polishing And chrome plating. 189 00:12:02,862 --> 00:12:05,241 The mill then Shapes brass rings. 190 00:12:05,241 --> 00:12:07,655 These are bases for the woofers, 191 00:12:07,655 --> 00:12:10,827 Which fit an opening In the mounting plate. 192 00:12:10,827 --> 00:12:13,379 Brass is the metal Of choice for these parts, 193 00:12:13,379 --> 00:12:16,586 Due to its acoustical Properties. 194 00:12:16,586 --> 00:12:19,310 For aesthetics, the rings Are painted black, 195 00:12:19,310 --> 00:12:21,172 And the mounting plates Are electro-plated 196 00:12:21,172 --> 00:12:24,724 With galvanized chrome. 197 00:12:24,724 --> 00:12:26,103 In this part of the plant, 198 00:12:26,103 --> 00:12:29,620 They build tweeters For the main system towers. 199 00:12:29,620 --> 00:12:31,310 The first step is to lay strips 200 00:12:31,310 --> 00:12:33,586 Of resin-impregnated Carbon fiber 201 00:12:33,586 --> 00:12:37,413 In semi-circular molds. 202 00:12:37,413 --> 00:12:39,241 After removing The protective film 203 00:12:39,241 --> 00:12:40,862 That covers the carbon fiber, 204 00:12:40,862 --> 00:12:44,344 They lay foil strips At each end. 205 00:12:44,344 --> 00:12:46,000 These will direct heat From the oven 206 00:12:46,000 --> 00:12:47,655 To the carbon fiber strips 207 00:12:47,655 --> 00:12:50,000 And prevent the resin From flowing out. 208 00:12:52,862 --> 00:12:56,827 They assemble the molds And clamp them shut. 209 00:12:56,827 --> 00:12:59,931 They place the molds In an oven for 45 minutes 210 00:12:59,931 --> 00:13:03,000 At a programmed series Of temperatures. 211 00:13:03,000 --> 00:13:05,448 This heats the resin In the carbon fiber, 212 00:13:05,448 --> 00:13:08,724 Stiffening and forming The strips to the mold shape. 213 00:13:10,689 --> 00:13:12,068 Using a punch press, 214 00:13:12,068 --> 00:13:14,275 Workers slice Each carbon fiber strip 215 00:13:14,275 --> 00:13:16,448 Into several thinner strips. 216 00:13:23,620 --> 00:13:25,068 They construct each tweeter 217 00:13:25,068 --> 00:13:27,206 By gluing 24 Of those thin strips 218 00:13:27,206 --> 00:13:28,965 To the tweeter's voice coil, 219 00:13:28,965 --> 00:13:31,344 A ring made of Wound copper wire. 220 00:13:34,620 --> 00:13:37,206 They brush silicone In between the strips, 221 00:13:37,206 --> 00:13:39,793 Coat the entire surface With more silicone, 222 00:13:39,793 --> 00:13:42,551 Then place an aluminum Cover plate on top. 223 00:13:44,689 --> 00:13:48,068 They construct each mid-range Driver the same way, 224 00:13:48,068 --> 00:13:49,689 But with carbon fiber strips 225 00:13:49,689 --> 00:13:51,344 That are thicker and stiffer 226 00:13:51,344 --> 00:13:53,724 And therefore radiate Lower frequencies better 227 00:13:53,724 --> 00:13:56,758 Than the thinner, More flexible tweeter strips. 228 00:13:59,586 --> 00:14:01,758 Placing the strips with tweezers 229 00:14:01,758 --> 00:14:04,103 And aligning them properly With a toothpick 230 00:14:04,103 --> 00:14:08,000 Requires a good eye, Excellent dexterity, 231 00:14:08,000 --> 00:14:10,068 And a lot of experience. 232 00:14:12,689 --> 00:14:14,758 Like the tweeter, The mid-range driver 233 00:14:14,758 --> 00:14:17,551 Goes into an oven For 45 minutes 234 00:14:17,551 --> 00:14:20,172 Through a specific cycle Of temperatures. 235 00:14:26,724 --> 00:14:29,379 Once the driver comes out Of the oven and cools, 236 00:14:29,379 --> 00:14:31,517 They glue strips Of sound-dampening foam 237 00:14:31,517 --> 00:14:33,103 To the inside, 238 00:14:33,103 --> 00:14:36,862 Sealing the gaps between The carbon fiber strips. 239 00:14:36,862 --> 00:14:39,448 This prevents sound From radiating inward 240 00:14:39,448 --> 00:14:41,344 Rather than out the speaker. 241 00:14:43,551 --> 00:14:44,655 They solder the cables 242 00:14:44,655 --> 00:14:46,586 That bring the incoming Electrical signal 243 00:14:46,586 --> 00:14:50,137 That carries The sound frequencies. 244 00:14:50,137 --> 00:14:52,379 That signal moves The voice coil up 245 00:14:52,379 --> 00:14:55,827 While the driver's magnet Moves it back down. 246 00:14:55,827 --> 00:14:57,724 The repeated up and down motion 247 00:14:57,724 --> 00:15:00,379 Flexes the carbon fiber strips, 248 00:15:00,379 --> 00:15:03,620 Radiating the sound frequencies. 249 00:15:03,620 --> 00:15:06,413 After installing a center rod Made of carbon, 250 00:15:06,413 --> 00:15:09,068 Workers stuff the hollow space Inside the driver 251 00:15:09,068 --> 00:15:12,000 With sound-dampening wool. 252 00:15:12,000 --> 00:15:13,344 They pour lubricating oil 253 00:15:13,344 --> 00:15:16,103 Into a narrow gap In the driver's magnet, 254 00:15:16,103 --> 00:15:19,620 Then insert the voice coil Into the gap. 255 00:15:19,620 --> 00:15:21,344 The oil contains iron, 256 00:15:21,344 --> 00:15:24,310 So it conducts the electrical Signal to the coil. 257 00:15:26,896 --> 00:15:28,517 They screw an aluminum Mounting plate 258 00:15:28,517 --> 00:15:30,413 To the magnet's posts... 259 00:15:32,862 --> 00:15:36,275 ...Then apply a disk of a stiff Sound-dampening material. 260 00:15:39,758 --> 00:15:43,000 They install the tweeter's Magnet on the mounting plate, 261 00:15:43,000 --> 00:15:44,931 Feeding the tweeter's Electrical cables, 262 00:15:44,931 --> 00:15:48,172 Not yet soldered to the tweeter, Through the center rod. 263 00:15:50,793 --> 00:15:52,827 Next they'll make the woofers. 264 00:16:04,724 --> 00:16:07,758 Narrator: The sound system's amplifier Delivers the electrical signal 265 00:16:07,758 --> 00:16:10,310 That carries all The sound frequencies. 266 00:16:10,310 --> 00:16:12,482 Inside each main system speaker, 267 00:16:12,482 --> 00:16:14,793 An electronic component Called the crossover 268 00:16:14,793 --> 00:16:16,620 Separates the frequency ranges 269 00:16:16,620 --> 00:16:19,241 And sends them, Via designated cables, 270 00:16:19,241 --> 00:16:21,103 To the appropriate driver. 271 00:16:24,379 --> 00:16:26,206 They make each Melon-shaped woofer 272 00:16:26,206 --> 00:16:28,620 Out of 12 aluminum segments. 273 00:16:28,620 --> 00:16:31,413 They glue acoustic foam To each segment, 274 00:16:31,413 --> 00:16:34,172 Then trim the foam To the shape of the aluminum. 275 00:16:36,620 --> 00:16:38,793 Workers assemble the woofer Upside-down 276 00:16:38,793 --> 00:16:41,275 In an assembly fixture. 277 00:16:41,275 --> 00:16:42,724 They glue the segments Vertically 278 00:16:42,724 --> 00:16:44,586 Between this woofer's Voice coil, 279 00:16:44,586 --> 00:16:46,448 Which has two cables Attached to it 280 00:16:46,448 --> 00:16:49,241 And a mounting plate. 281 00:16:49,241 --> 00:16:50,517 The structural rod 282 00:16:50,517 --> 00:16:52,517 Through which they'll feed The other driver's cables 283 00:16:52,517 --> 00:16:53,931 Is in the center. 284 00:16:59,206 --> 00:17:01,965 Once all the segments Are aligned and fixed in place, 285 00:17:01,965 --> 00:17:04,000 They coat the edges with glue. 286 00:17:06,965 --> 00:17:10,413 Then they adhere rubber gaskets In between the segments 287 00:17:10,413 --> 00:17:13,206 To block the gaps And prevent air from exiting. 288 00:17:19,896 --> 00:17:22,655 They seat copper strips In the segment's grooves, 289 00:17:22,655 --> 00:17:27,310 Hooking the ends into holes At the top and bottom. 290 00:17:27,310 --> 00:17:30,689 Brass, aluminum, copper -- Every type of material used 291 00:17:30,689 --> 00:17:34,965 In these speakers has specific Acoustical properties. 292 00:17:34,965 --> 00:17:38,586 The combination produces A natural sound balance. 293 00:17:41,000 --> 00:17:42,965 They fill the hollow Interior space 294 00:17:42,965 --> 00:17:47,137 Around the center rod With sound-dampening material. 295 00:17:47,137 --> 00:17:49,206 First, synthetic insulating wool 296 00:17:49,206 --> 00:17:51,689 With long, coarse fibers. 297 00:17:51,689 --> 00:17:53,206 Then, on top of that, 298 00:17:53,206 --> 00:17:55,448 A barrier Of cotton-insulating wool 299 00:17:55,448 --> 00:17:57,000 To prevent those coarse fibers 300 00:17:57,000 --> 00:17:58,793 From touching the voice coil. 301 00:18:01,172 --> 00:18:03,517 Next, they install The painted brass ring 302 00:18:03,517 --> 00:18:04,896 They milled earlier, 303 00:18:04,896 --> 00:18:09,344 Which now has the woofer's Magnet fixed to it. 304 00:18:09,344 --> 00:18:13,413 They place a spacer, Thread a screw, 305 00:18:13,413 --> 00:18:16,655 Pull the voice coil's two Cables through the center, 306 00:18:16,655 --> 00:18:18,206 Then solder those cables, 307 00:18:18,206 --> 00:18:20,379 Together with the cables From the other drivers, 308 00:18:20,379 --> 00:18:23,551 To a main cable that will plug Into the crossover. 309 00:18:27,551 --> 00:18:29,482 They flip the woofer Right side up 310 00:18:29,482 --> 00:18:31,586 And pour a liquid Sound-dampening compound 311 00:18:31,586 --> 00:18:34,551 Into the center rod. 312 00:18:34,551 --> 00:18:36,448 The cables inside Are too delicate 313 00:18:36,448 --> 00:18:38,482 To be shoving in Insulating wool. 314 00:18:40,931 --> 00:18:43,793 Workers now begin Assembling the speaker, 315 00:18:43,793 --> 00:18:46,862 First soldering the two Remaining crossover cables, 316 00:18:46,862 --> 00:18:48,551 Mid-range and high frequency, 317 00:18:48,551 --> 00:18:51,724 To the respective driver cables. 318 00:18:51,724 --> 00:18:53,068 The tweeter connection cables 319 00:18:53,068 --> 00:18:55,103 Are attached To the tweeter magnet, 320 00:18:55,103 --> 00:18:58,586 Installed earlier on top Of the mid-range driver. 321 00:18:58,586 --> 00:19:03,103 They now mount this unit On top of the woofer. 322 00:19:03,103 --> 00:19:06,172 They install the connectors In the crossover. 323 00:19:06,172 --> 00:19:09,172 Its electrical components Separate the frequency ranges 324 00:19:09,172 --> 00:19:12,896 And send each one To a designated connector, 325 00:19:12,896 --> 00:19:14,068 Which sends it to the cable 326 00:19:14,068 --> 00:19:17,241 Leading to The appropriate driver. 327 00:19:17,241 --> 00:19:20,172 After sliding the crossover Onto the speaker's base, 328 00:19:20,172 --> 00:19:21,896 Made of milled brass, 329 00:19:21,896 --> 00:19:24,758 They close up the top With the mounting plates, 330 00:19:24,758 --> 00:19:26,689 Between which they've Since sandwiched 331 00:19:26,689 --> 00:19:28,931 A thick piece of wood. 332 00:19:28,931 --> 00:19:31,034 Screw-in stainless steel Support posts 333 00:19:31,034 --> 00:19:32,517 Hold everything together 334 00:19:32,517 --> 00:19:34,689 And direct all the weight Down to the floor, 335 00:19:34,689 --> 00:19:37,103 Rather than into The speaker structure. 336 00:19:40,000 --> 00:19:42,068 They install An aluminum crossbar 337 00:19:42,068 --> 00:19:44,241 For structural support, 338 00:19:44,241 --> 00:19:46,724 Then a second set of posts. 339 00:19:49,862 --> 00:19:52,137 They fit the ring At the base of the woofer 340 00:19:52,137 --> 00:19:55,689 Into the mounting plate hole, Securing it with screws. 341 00:19:58,931 --> 00:20:01,931 They insert the tweeter's voice Coil into the tweeter magnet 342 00:20:01,931 --> 00:20:04,827 That's mounted on top Of the mid-range driver 343 00:20:04,827 --> 00:20:07,379 That's mounted On top of the woofer. 344 00:20:07,379 --> 00:20:09,034 They solder the tweeter cables 345 00:20:09,034 --> 00:20:12,517 To the two connectors On the tweeter cover plate. 346 00:20:12,517 --> 00:20:16,586 This completes The lower trio of drivers. 347 00:20:16,586 --> 00:20:19,068 Now they install An identical upper trio, 348 00:20:19,068 --> 00:20:20,586 But upside-down 349 00:20:20,586 --> 00:20:22,689 So that the two tweeters Face each other 350 00:20:22,689 --> 00:20:25,482 In the middle of the tower. 351 00:20:25,482 --> 00:20:28,172 They mount the crossover For the upper trio 352 00:20:28,172 --> 00:20:31,034 And plug in the connector That joins the three cables. 353 00:20:31,034 --> 00:20:32,862 That brings The correct frequencies 354 00:20:32,862 --> 00:20:36,103 To the three drivers. 355 00:20:36,103 --> 00:20:39,862 They run test tones Through every completed speaker. 356 00:20:39,862 --> 00:20:42,620 A microphone positioned Just over three feet away 357 00:20:42,620 --> 00:20:44,655 Picks up The emitted frequencies, 358 00:20:44,655 --> 00:20:47,310 Which a computer Analyzes for accuracy. 359 00:20:50,068 --> 00:20:52,344 Once the speaker Passes inspection, 360 00:20:52,344 --> 00:20:55,896 They install a decorative grill Over each woofer voice coil. 361 00:20:59,068 --> 00:21:02,931 The subwoofer tower radiates The lowest frequencies, 362 00:21:02,931 --> 00:21:06,448 With six huge drivers And a built-in amplifier. 28385

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