Amplifier Jack
ItemPower Loader's contribution to Kyoka Jiro's costume upgrade is a pair of small speakers strapped to her forearms. Jack her Earphone Jacks into them and the quiet thud of her own heartbeat turns into a weapon loud enough to tear open the ground she is standing on.
Overview
Higari Maijima, the hero Power Loader, built the Amplifier Jack as support gear when Kyoka Jiro's costume was revised. The set amounts to two compact speakers, one riding each of her forearms.
On their own they do nothing. Their whole purpose is to give her Quirk a louder voice.
Function
Kyoka plugs her Earphone Jacks straight into the devices. Her heartbeat, already the raw material her Quirk works with, gets pushed far past its natural volume, and whatever her wrists make contact with takes the resulting sonic wave. The output is violent enough to break up solid ground.
She is not limited to touching things, either. Using her Earphone Jacks she can pull the speakers off her arms entirely and point them wherever she likes, sending that amplified heartbeat at a target from a distance.
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Frequently Asked Questions
What is the Amplifier Jack in My Hero Academia?
The Amplifier Jack is a piece of support equipment built by the hero Power Loader for Kyoka Jiro's costume upgrade. It consists of two compact speakers worn on her forearms that amplify the sonic waves produced by her Earphone Jack Quirk.
How does Kyoka Jiro use the Amplifier Jack?
Kyoka Jiro plugs her Earphone Jacks directly into the Amplifier Jack speakers, which push her heartbeat far past its natural volume. Whatever her wrists touch takes the resulting sonic wave, an output strong enough to break up solid ground.
Can the Amplifier Jack be used at a distance?
Yes, Kyoka Jiro can use her Earphone Jacks to pull the Amplifier Jack speakers off her arms entirely and aim them wherever she likes. That lets her send the amplified sonic wave at a target from a distance rather than only through direct contact.
Who created the Amplifier Jack?
The hero Power Loader, whose real name is Higari Maijima, built the Amplifier Jack as support gear when Kyoka Jiro's costume was revised. On their own the speakers do nothing; their entire purpose is amplifying her Quirk.
When did the Amplifier Jack first appear in My Hero Academia?
The Amplifier Jack first appears in Chapter 99 of the manga and Episode 52 of the anime. It is tied directly to Kyoka Jiro's Earphone Jack Quirk and cannot function without it.
Sources & Information
Looking for more on Amplifier Jack? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the Dragon Ball anime series, manga, and official materials. Episode and chapter references are cited where applicable.
Character and scene imagery on this site is original artwork by Daddy Jim Headquarters, not screenshots or licensed imagery. Official cover art is used on three types of pages for editorial commentary:
- Movie pages: theatrical posters and key visuals, credited to Toei Animation and Shueisha.
- Game pages: official box art, credited to Bandai Namco, Atari, and other publishers.
- Manga chapter pages: Jump Comics volume covers, credited to Shueisha and Akira Toriyama.
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