As more people enjoy music and video through their smartphones, even greater importance is placed on the multimedia capabilities of our mobile devices. In the design of the Galaxy S9, Samsung set out to reimagine the smartphone’s speakers, joining with globally renowned audio specialists to achieve a premium stereo sound.

Sitting down with three of the flagship smartphone’s designers in the Mobile Communications Business – Dongsoo Kim from the Global Product Planning Group and Jaehyun Kim and Seongkwan Yang from the Audio Group – we took a closer look on how the speakers of the Galaxy S9 and S9+ were optimized for multimedia content.

More Speakers, More Sound

Dongsoo Kim reflected on what drove the team to bring the stereo speaker experience to the Galaxy S9: “As more and more people access content through their smartphones, greater emphasis was placed on the screen and creating bigger, higher-quality displays to view content with. Since display technology has already reached this point, we set out to design a high-performing speaker to equal the screen.”

The first step in Samsung’s journey towards stereo sound was equipping the device with two speakers. Whereas previous generations of the smartphone have placed a single speaker at the bottom of the phone, the Galaxy S9 has speakers at both the bottom and the top of the phone, creating a more immersive experience.

“The key was to develop speakers and amplifiers that serve the dual purpose of making phone calls and consuming media,” said Jaehyun Kim. “We poured our efforts into enhancing the quality of the sound and creating greater volume.”

The speaker holes were redesigned to be larger, producing higher quality audio, and the team was also able to increase the device’s volume, making it 1.4 times (3-4 dB) louder than the Galaxy S8.

Over 80 Designs Tested

There are strict procedures to ensure the reliability of Samsung products and multiple stages of testing were involved in designing the speakers of the Galaxy S9.

To achieve greater sound accuracy and precision, the audio designers paid close attention to enhancing the speakers’ dynamic range – the ratio of the quietest to the loudest sounds that the speakers can reproduce – and their frequency range, which controls the pitch.

“Our primary focus was to develop a speaker that is both high performing and stable,” Seongkwan Yang explained. “We carefully examined the quality of the components, testing more than 80 versions of the diaphragm before we were finally satisfied that we had a speaker that functioned seamlessly at both high and low pitches.”

Jaehyun Kim added: “We encountered unexpected challenges as we converted the mono speaker into stereo speakers, so we strived to optimize the device for viewing multimedia content.”

Partnering with Audio Experts

As part of their commitment to create a high-quality sound experience for the Galaxy S9, Samsung joined forces with two global experts in audio technology: premium Harman’s brand AKG, and Dolby.

The developers aimed to achieve high-fidelity sound quality and precision at any volume by leveraging the expertise of Harman’s AKG. Coordinating closely, it took half a year to fine- tune the speakers to meet AKG’s high standards.

“Users with a good ear for sound can immediately appreciate the difference. Samsung’s long dedication in search of enhanced audio, coupled with Harman’s expertise, resulted in the speakers satisfying both sound quality and volume,” commented Jaehyun Kim.

The Galaxy S9 also integrates Dolby Atmos® immersive sound technology, which brings entertainment to life with moving audio that flows all around you, be it over a device’s built-in speakers or through regular stereo headphones. Leveraging Dolby’s deep understanding of what listeners prefer in an audio experience, Dolby Atmos® on the Galaxy S9 makes you feel as if you are inside the action as the sounds of people, places, things, and music come alive with richness and depth and seem to move in three-dimensional space. This feature benefits other types of content in addition to Dolby Atmos® enabled content, through enhancements to sound quality and consistent playback volume across all content.

“During our testing, our results showed that immersive sound could bring a whole new experience to smartphone users,” Dongsoo Kim elaborated. “Since so many people now view premium content on their smartphones, it felt like the right moment to implement Dolby Atmos on our devices.”

Making the Most of an Optimized Audio Experience

The audio developers had plenty of tips about how to enjoy the stereo sounds of the Galaxy S9.

Jaehyun Kim recommended listening to classical music to gain a fuller understanding of the difference: “You can distinguish the individual sounds and characteristics of each instrument. It’s an amazing feeling to hear the audio how it was originally intended, picking out every interaction between soft and loud.”

“Head to the sounds and vibration settings on your phone,” advised Dongsoo Kim. “Take a look at sound quality and effects under the advanced features and turn on Dolby Atmos to enable immersive audio. Users can also enhance their headphone audio experience by turning on the UHQ upscaler and the Adapt Sound feature, taking their listening to a new level.”

Now, one month on from the launch of the Galaxy S9, the team is already carefully considering its next steps in audio design. Dongsoo Kim elaborated: “Our aim will be to create a mobile multimedia experience that is just like holding a cinema in your own hands.”

Tuned by audio experts at AKG, you’ll discover new hidden sounds in your favorite song when you listen to music on the Galaxy S9/S9+. And when combined with Dolby Atmos surround sound, watching movies on your device will be more immersive than ever before, bringing you up close and personal to the action.

How did our team of experts at Samsung manage to build such quality audio capabilities within such a small smartphone? We went straight to the source to get the story behind the supreme sound system.

01. The Problem

If you look at a smartphone, chances are it only has one speaker at the bottom. This means that sound waves can only travel in one direction, restricting the overall listening experience. And since smartphones must fit into our pockets, the speakers tend to be small, which limits their ability to fully produce bass sounds.

02. The Goal

That’s why we set out to develop a smartphone with multiple dynamic speakers that can fit into the palm of your hand. We believed, with sound coming from different areas of the phone and emanating in various directions, watching films on the phone could be as immersive as going to the cinema.

03. The Idea

To turn the Galaxy S9/S9+’s sound quality into a three-dimensional experience, we wanted to place another dynamic speaker in the phone. The top of the phone was the best location as this would allow the device to play sound in stereo. This meant we had to rearrange the internal components, like the front camera and iris scanner, to make room. On top of that, we had to design a speaker that is powerful yet slim enough for the new phones to maintain Samsung’s Infinity Display.

04. The Solution

Engineers from different departments worked together to adjust the location of various components and also increased the size of the existing speaker by 1.5 times. We also spent a year modifying the kinetic structure of the speaker to make sure there was enough room. But due to the shape of the Galaxy S9/S9+, there were still slight differences in the sizes of the two speakers. That’s why we had to tune the speakers to balance the output levels. And finally we reduced interference from other components that also use magnets so that they wouldn’t cause static or noise in the speaker.

05. The Result

With these changes, we were able to produce the Galaxy S9/S9+ sound system, which delivers sound that’s 1.4 times (3-4dB) louder than the Galaxy S8. We also partnered with Dolby Atmos to incorporate Virtual Surround Sound Effect in the smartphone to maximize the stereo speakers’ capability. Instead of mixing by channels, Dolby Atmos places sounds within a three-dimensional audio environment, giving listeners the impression that sounds are coming from everywhere. Audio experts at AKG also fine-tuned the speakers, expanding their bass range while ensuring they can handle high volumes without distortions. Together, these innovations allow the Galaxy S9/S9+ to deliver a unique audio experience.

06. A Simple How-to Guide