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#1 | Siri

When Siri launched in 2011, she permanently changed the way people interacted with their technology. What was it like to be the voice behind that …

#2 | NBC Chimes

NBC’s three little chimes didn’t just define a television network, they defined a generation. Where did they come from and what is the surprising impact they have had on current and future …

#3 | 8-bit

Primitive, yet iconic, 8-bit audio defined a generation through video game sounds and music. Discover the history and innovation behind those audio marvels that still fascinate today. …

#4 | Mystery Hum

There's this place right at the border between Detroit, MI, and Windsor, ON where there's this hum… It rattles dishes, makes people sick, it's even making people move away. And the …

#5 | Sound of Extinction

When was the last time you heard a dial-up modem? A dot matrix printer? A CD dropping into its plastic tray? Did you know it would be the last time? …

#6 | From Analog to Digital

Did we lose anything when we transitioned from analog to digital? Learn about the Jedi skills old radio DJs had to have to spin vinyl on the radio, …

#7 | Movie Soundtrack

When you think of a movie soundtrack, you probably think music. And sure, that’s one of the many, many things going on there. What else goes into making a scene sound “natural”? It isn’t …

#8 | Audio Descriptions

Did you know there might be a track of audio on your favorite movies and television shows that describe all of the actions on screen? This technology …

#9 | Cars

Some car sounds are more obvious like the horn or engine... but what about the not-obvious-until-you-point-them-out sounds like the hollow thud of a …

#10 | Dolls That Talk... And Some That Listen

Talking dolls have been around for over a century, but the fascination with making inanimate objects seem human reaches back into our early history. …

#11 | Space

When we think about sound, our only reference is what it’s like here on Earth. What happens when we leave this thin blanket of atmosphere, and what do other planets sound like? Featuring …

#12 | Foley

When you listen to a movie, everything the actor touches sounds crisp and clean. However, none of it was recorded on the movie set. Go behind the scenes with some of the unsung heroes of …

#13 | The Good, the Bad & the Irritating

Some sounds are like rug burn for your ears, while others are pleasant and soothing. We explore these sounds and get to the bottom of why we might interpret them as “good” or “bad”. …

#14 | Hearing Loss

Our ears are sensitive, but we often don’t treat them that way. We are born with the ability to hear up to 20,000 Hz. As we age, our hearing range diminishes. On top of that, the more …

#15 | Voice Acting

We hear disembodied voices all the time, in everything from cartoons and anime to commercials and trailers. It seems easy, but it's actually an …

#16 | The Wilhelm Scream

When it comes to movie screams, what’s the first one you think of? Is it a scream that evokes a sense of fear, pain, or maybe even… humor? Perhaps you immediately think about a famous …

#17 | Forensic Audio

You might not realize it, but audio can be just as crucial to solving a case than video or eyewitness testimony. But understanding how to interpret …

#18 | Evolution of Accents

When you describe yourself to others you might mention your height, hairstyle, or maybe your build. But one of the most telling things about you is something you can’t even see, yet it …

#19 | 20,000 dBs Under the Sea

71% of the Earth is covered by water. And most of us imagine it to be a serene, almost silent world. But why should we have all the fun up here? …

#20 | Noise Pollution

Noise pollution is something we’ve all experienced. Road construction, motorcycles, passing aircraft - the list goes on and on. Other than being just …

#21 | Sound Firsts

What is the oldest recorded sound in history? For over 100 years researchers thought they knew until a mind-blowing discovery by historians found …

#22 | Fight or Flight

Are you afraid to fly? Does even the thought of boarding an airplane make you anxious? You’re not alone. Millions of Americans suffer from clinical aviophobia. While some manage to distract …

#23 | Sonic Seasoning

Taste is one of our most subjective of the five senses. A flavor that elicits delight in one individual may evoke strong disgust in another. And while we all have a basic understanding of …

#24 | Watergate

Watergate might be the most widely-referenced scandal in our nation’s history. The actual word itself has been appropriated in order to name many later scandals. But for a new generation of …

#25 | Level Up

Video games are a growing industry and every play-controlled experience is defined by its harmony of music, sound effects, and voice acting. In this …

#26 | Acoustical Umbilical Cord

Many animals, humans included, are natural-born criers. It’s the most basic form of communication from right when we come into the world. But us humans are unique: we keep on crying until …

#28 | Disney Parks

Theme parks have a way of transporting us to magical places, and sound is crucial in maintaining the illusion. From the most action-packed attractions to the background music playing …

#29 | Let It Beep

For over two decades, every time you turned on a Mac, you were greeted by a familiar sound. It’s appeared as a punchline in The Simpsons, and in movies like WALL•E. It’s a sound some of us …

#30 | The Bleeps, the Sweeps, and the Creeps!

There are sounds we interact with every single day and never give a second thought. Our phones, computers, cars, and other devices are constantly communicating with us through user …

#31 | The Gift

The science behind sound reproduction has been studied for centuries. But what will research uncover in the centuries to come? One man made it his life’s mission to find out, and a gift he …

#32 | 3149146093

A mysterious Tweet from one of the most famous people on Earth: A single phone number, zero context. What does it mean? Why was it posted? Would you …

#34 | Muzak

“Elevator music” was once the sound of restaurants, offices, and elevators in mid-20th century America. But ironically these bland, string-driven instrumental tracks are never heard in …

#35 | Emergency Alert System

When people in Hawaii were falsely alerted of a Ballistic Missile threat, the first thing they heard was the sound of an emergency alert. For decades, this tone has alerted us to local …

#36 | Hamilton

Broadway’s award-winning, record-breaking, smash hit, Hamilton, is a musical unlike any other. Get the story from people in the room where it happens of how sound helps tell the musical’s …

#37 | Seizure Sonification

Brant Guichard has heard "The Music" for as long as he can remember. Brant has a particular type of epilepsy where he hears what are called "musical …

#39 | Live Theater

Amazing concerts, Broadway musicals, Cirque du Soliel performances, and other live shows live and die on their sound design. This is the story of how …

#40 | ASMR

Do certain sounds give you the head tingles? If yes, this episode is full of ear candy for you! In this episode, we learn all about the phenomenon …

#41 | Ultrasonic Tracking

Did you know your phone is a really good listener? Apps on your phone might be sending and receiving data over ultrasound. Ultrasonic communication …

#42 | Amen Break

There’s a sample of music that’s been heard in over 2,000 songs. Odds are you’ve heard it many times and didn’t even realize you were listening to the same breakbeat. The amen break might …

#43 | THX Deep Note, Part 1

Since 1983 one of the most memorable parts of going to the movies has been the THX certification played during the previews. The accompanying sound logo called “The Deep Note” has …

#44 | THX Deep Note, Part 2

Whether you're 6 years old, or 96 years old, one of the most memorable parts of going to the movies for the last three decades has been the THX "Deep …

#45 | Misophonia

The way our brains process sound affects the way we respond to sound. This episode is about why that happens in those who suffer from misophonia, the hatred of certain sounds. Featuring …

#46 | Slot Machines

What do you hear when you walk into a Casino? It can feel like chaos, but each sound is carefully curated to draw you in and make you stay. One …

#48 | Sonic Branding

We are constantly exposed to sonic branding in television, radio, and web commercials. We deconstruct some of the most impactful audio logos in …

#49 | Jingles

Odds are if we asked you sing your favorite advertising jingle from when you were a kid, you’d be able to recall every single lyric. Yet we don’t hear many advertising jingles these days. …

#50 | Twenty Thousand Hertz

50 episodes! When we launched this podcast two years ago, we never imagined our passion project would come this far. To mark the occasion, we’re …

#51 | Classic Cartoon Sound Effects!

Cartoon sound effects are some of the most iconic sounds ever made. Even modern cartoons continue to use the same sound effects from decades ago. How were these legendary sounds made and …

#52 | The Theremin

If you've ever watched an old sci-fi or horror film, you've probably heard the hair-tingling, alien sounds of the Theremin. It's a spooky, strange …

#53 | Theater for the Mind

The "golden age of radio drama" may have been a stellar period for storytelling -- but the stories weren't all golden bright. Sci-fi and horror radio …

#54 | Xbox Startup Sound

The Xbox startup sound is an audio logo that’s become synonymous with the game console. But its origins are rooted in solving a logistical problem; …

#55 | Being George Clooney

Hollywood films are huge internationally. But how are these films adapted for foreign languages? We delve into the not so talked about process of …

#56 | Boots 'n Cats

Beatboxing began as an imitation of a drum machine, but over the decades it has evolved as a means to emulate any number of percussive sounds. Now …

#57 | Space Remix

What happens when we leave Earth's thin blanket of atmosphere, and what do other planets sound like? In this special episode, we have completely remixed one of our favorite shows! It's been …

What is 20k? (2019 Trailer)

Twenty Thousand Hertz is a lovingly crafted podcast that tells the stories behind the world's most recognizable and interesting sounds. Subscribe now.

#58 | Silence

Our world is filled with sound. It exists in even the quietest corners of the planet. But what happens when all that sound is taken away? What is silence? There are very few places on Earth …

#59 | BLUE! 42!

For decades, NFL strategy slowly evolved from each team running a dozen different plays, to rigid schemes with coaches sending in orders through …

#60 | Do Not Disturb

Alarm sounds have been around almost as long as humans themselves. But as our world has transformed, so have they. Today’s alarms are having an unexpected effect on our minds and bodies, …

#62 | The Booj

Movie trailers have undergone a huge evolution. They’ve gone from those cheesy voice-of-God narrators in the ‘80s and ‘90s, to boojes and bwaas. …

#63 | Phone Tones

We unpack how touch tone dialing changed communication forever. Join us on a deep, quirky dive into telephone history. We’ll also deconstruct these sounds and reveal their hidden …

#65 | Voyager Golden Record

In the late '70s, NASA launched Voyagers 1 & 2 to explore the furthest reaches of our solar system and beyond. But something amazing was included …

#67 | Mother of Dragons(ounds)

Game of Thrones is a global phenomenon that has redefined the fantasy genre. Viewers from around the world gather every week to anxiously watch what will happen next. The actors, writers, …

#68 | Sonic Illusions

What we hear is incredibly personal and we all hear things differently. Sometimes our ears can even play tricks on us. Sonic illusions put a spotlight on the unique function of our hearing …

#69 | Plants that Sing

Have you ever wondered what your dog or cat would say to you if they could talk? How about your plant? In this episode we explore the world of …

#71 | Soundmarks®

Companies spend a lot of time and effort perfecting the look of their brands. But now what a brand sounds like matters just as much. We trace the history from songs to jingles to what's …

#72 | 808

The 808 is arguably the most iconic drum machine ever made. Even if you’ve never heard of it, you’ve definitely heard it. It’s in dozens of hit songs -- from Usher to Marvin Gaye, Talking …

#73 I Stradivarius

Stradivarius violins are reputed to have an exquisite sound that cannot be replicated or explained. Why is that? And what, exactly, is a Stradivarius …

#74 I Hear Here!

Humans have been fascinated with acoustics since our earliest ancestors. From Roman amphitheaters to modern symphony halls, we’ve designed our spaces with sound in mind. But the …

#75 I Speak Easy

We rarely think about the way we speak. For most of us, it just happens. In this episode, we catch up with two professional voice artists and chat about their rituals and techniques that …

#76 I You've Got Mail!

How a simple soundbite on America Online became one of the most recognizable sounds of the internet age, plus the creation of a whole new musical …

#77 | The [COMPRESSED] History of Mastering

Join us on a musical journey from the Golden Age of analog mastering to the digital methods of today. We’ll find out why the music industry became …

#78 | The Loudness Wars

In part 2 of the story of mastering, we explore the consequences of the Loudness War and call out some of the worst offenders. We’ll also hear about the artists and mastering engineers who …

#79 I The Price is Right (Yeah, Yeah!)

As a young composer, Edd Kalehoff was looking for his break. In the early 70s he struck gold, writing the theme song and music cues for The Price Is …

#80 I Virtual Choir

Singing with others is a powerful form of expression. That's why the composer Eric Whitacre started the Virtual Choir; an experiment that connects …

#81 I Baby Shark

Baby Shark is a mega viral YouTube video, an unstoppable earworm, a top 40 hit, a Eurodance smash, a decades old campfire song, and the center of an …

#82 | Vroom Vroom

When was the last time you turned off your radio and just listened to your car? What’s really going on under the hood? We chat with our own Nick Spradlin about the simple force at the heart …

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Start listening to #82 | Vroom Vroom
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Start listening to #82 | Vroom Vroom
29:25