REACTA Board | High-performance custom board that brings DS4 to the next generation

Same shape.

True evolution.

DS4の形はそのままに、"入力の土台"を再設計しました。

REACTA

( JDM-5X Rebuild Model )

REACTAを手に入れる

MERKA.G PS5 Dualsense Custom Controller Back Button カスタムコントローラー背面ボタン MG Series Original Design

変わらない形。

ただ、確かな進化。

DS4の形はそのままに、

"入力の土台"を再設計しました。

REACTA

( JDM-5X Rebuild Model )

REACTAを手に入れる

Looks like a DS4.
But inside, it’s something else entirely.

We kept the shape but completely overhauled the performance. A model redesigned as "the next answer to the DS4."

The familiar feel, with a surprisingly new sense of control.

MERKA.G PS5 Dualsense Custom Controller Smart Trigger カスタムコントローラー背面ボタンクリックトリガーバンパー

Polling Rate

（最大8000Hz）

125〜8000Hzの範囲で応答速度を最適化。入力遅延を極限まで抑え、競技レベルの反応速度に対応。

キャリブレーション

専用Webツールで入力基準を補正。スティック中心・可動域を正確に再定義できます。

デッドゾーン

入力の遊びを細かく調整。微細なエイムからフル入力まで、思い通りに。

スティックカーブ

入力量に対する反応特性をカスタマイズ。リニア・加速型など、プレイスタイルに合わせて最適化。

「外側」ではなく、「入力そのもの」を変える。

Title

1秒間に、64倍の入力密度。

それは、エイムの微調整が"より細かく反映される"ということ。

125Hz

8msごとに入力取得

8000Hz

0.125msごとに入力取得

これは単なる数値の差ではありません。
エイムの微調整が、より細かく反映されるということです。

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なぜBluetoothを搭載しないのか？

REACTAは、入力に特化したボードです。入力精度を最大化するために、設計を“入力”へと最適化しています。

多機能を目指すのではなく、1フレームの差を丁寧に積み上げていく。

それがREACTAの考え方です。

以下の機能は搭載されていません

Bluetooth / 2.4GHz 無線接続

マクロ機能

振動モーター

タッチパッド機能

内蔵バッテリー

最高のパフォーマンスを得るため、PC背面のUSBポートへ直接接続してください。

How is it different from the original DS4?
Why REACTA is considered “next-generation”

REACTA
Original DS4

REACTA

Ultra-fast response up to 8000 Hz

USB TYPE-C

Precision aiming with TMR Stick

Contactless structure for longer lifespan

Secure grip with the rear grip

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Original

Signal rate around 250 Hz maximum

microUSB

Variable-resistance stick (wears out easily)

Prone to drift over time

Standard shell

Title

REACTA

Ultra-fast response up to 8000 Hz

USB TYPE-C

Stick fine adjustment

Secure grip with the rear grip

Original DS4

Signal rate around 250 Hz maximum

microUSB

Variable-resistance stick (wears out easily)

Prone to drift over time

Standard Shell

REACTAは、入力を“より細かく、より正確に”取得します。

ボードの精度を、どう活かすか。

REACTAは、基板だけでなく"操作感"も選択可能。用途に合わせて最適なスティックを選べます。

TMR

純正ALPS

AXIS

REACTAは、土台だけでなく“操作感”も選べる。

※用途に応じて選択可能

仕様を決めたら、次は入手方法。

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How to get it – How to get REACTA?

REACTAは、"基板だけ"ではありません。

完成モデルとして。

今のDS4のアップグレードとして。
自分で組み込むDIYとして。

PS4 Dualshock4 Custom Controller REACTA リアクタリビルドモデル

REBUILD MODEL

REACTA基板を実装した完成モデル。
検査・調整済みで出荷。

▶︎ 完成モデルを見る

PS4 Dualshock4 Custom Controller REACTA リアクタ Marius JDM-5X Board

持ち込みサービス

お手持ちのDS4をREACTAへ。
内部基板のみアップグレード。

▶︎ 持ち込みサービスを見る

PS4 Dualshock4 Custom Controller REACTA Marius JDM-5X Board

基板単体

組み込み前提の方向け。
スティック実装済みで出荷。

▶︎ DIYキットを見る

*This model is currently under preparation. The release date and detailed specifications will be announced on this page once they are confirmed.

*REACTA will be offered as a completed model (REBUILD). For detailed specifications and pricing, please see the product page.

REACTA
The core that leads the DS4 into the next generation.

外観はそのままに、内部だけを次世代化。
REACTAはDS4を"別次元の操作性"へ導く、パフォーマンスコアです。

MERKA.G PS5 Dualsense Custom Controller カスタムコントローラー Smart　Model Smart Trigger クリックトリガーバンパー

Developed by the world-renowned hardware engineer Marius.

The high-performance custom PCB “Marius JDM-5X” is a high-precision mainboard designed exclusively for the DualShock 4 by the globally acclaimed hardware engineer Marius. It minimizes input latency to the extreme, pursuing pure reaction speed and exceptional control precision. As a “competition-focused model,” it has earned strong support from players around the world.MERKA.G provides this JDM-5X through official channels in Japan, ensuring an environment where players can obtain and use it with complete confidence.

REACTA - The board built to keep reacting.

At MERKA.G, we use the JDM-5X as our “REACTA” board. The name combines React + Active, expressing our aim to create a board that continues to react instantly to every input.When integrated into the REBUILD MODEL, the exterior, internal structure, and overall operability are fully optimized for competitive performance. With our uniquely designed front shell, rear grip, and Type-C connector, we achieve a high-level balance of input precision, grip comfort, and response speed.Designed not only for competitive players but for anyone seeking more accurate control, this is MERKA.G’s flagship PS4 custom controller, built with the highest standards.

Disclaimer

This product is a special model provided as part of an experimental development project by Marius. Therefore, you will find it easier to use if you have a basic understanding of the hardware structure and settings.

MERKA.G is an authorized distributor of this product and offers board assembly and additional customization (optional). For the latest information on product usage and troubleshooting, please check the FAQ, which is updated regularly.

*Some issues caused by board-specific behavior or specifications may be outside the scope of support.

Key settings enabled by REACTA

Polling rate adjustment

Response speed can be optimized in the range of 125 to 8000Hz.

Stick Deadzone

Finely adjust the internal and external deadzones to minimize input play.

Stick Curve

Customize input characteristics based on the amount of tilt. You can adjust the "character" of your aim, such as linear or acceleration.

Trigger Deadzone (L2/R2)

In normal mode (non–click trigger), you can adjust the actuation point distance.

Rear Button Mapping

Models with rear buttons allow you to freely assign inputs.

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Additional custom options

Click Trigger/Bumper

Greatly shortens the travel distance of R1/R2/L1/L2. With a light, mouse-click-like response, it enables rapid tapping and faster, more precise actions. Ideal for FPS and competitive games where reaction speed is essential.

Rear Button

Allows quick inputs without lifting your fingers, enabling intuitive jumps and action commands. The balanced click feel prevents accidental presses and provides stable control in FPS and action games.

Setup Guide — How to use REACTA properly

When you receive your REACTA controller, please begin by flashing the firmware and recalibrating the sticks. In the current specification, stick settings are tied only to the “connected PC,” so the initial setup and recalibration when switching PCs are essential for proper operation.

This specification is planned to be improved in future updates, but for now, be sure to recalibrate upon arrival and whenever using the controller on a different PC.

1｜Calibration tool

When starting the device for the first time, please perform calibration using the dedicated tool.

Manual

Tool

2｜Recalibration

The REACTA board is dependent on the PC environment in which it is calibrated.
Therefore, be sure to recalibrate immediately after arrival or when connecting to another PC.

*LED and button settings are saved within the board, but stick settings require calibration each time.

3｜Operation check

Please check that all inputs are responding correctly and if you have any issues please contact our FAQ page or support.

About updates

REACTA is scheduled to continue to add new features and improve the game.

Check below for the latest updates and tools.

Renew/Update

We will also post new update information on social media (X/Instagram/LINE) from time to time.

Important Information

The greatest feature of the REACTA board is its native support for 8K polling rate. Because of this, there is no need to use third-party overclocking software. The JDM-5X can be configured through the setup link provided in the FAQ and supports the following onboard settings:

・Remappable rear buttons

・Inner / outer deadzone adjustment

・Customization of stick curve response

As this product uses a custom PCB, the following functions are not supported:

・Console connection ・ Bluetooth connectivity ・ Macro functions ・ Key assignment ・ Vibration motors ・ Touchpad functionality ・ Battery

Do not perform overclocking. REACTA already operates at an optimal 8K polling rate. Attempting additional overclocking may cause instability or even reduce response speed. For the best performance, connect the device directly to the rear USB port of your PC (USB-C to USB-A).

よくある質問

MERKA.GでJDM-5X（REACTA）を注文するメリットとは？

MERKA.G で JDM-5X（REACTAボード）を注文する最大のメリットは、届いた瞬間からすぐにプレイできる“完成済みの競技用コントローラー”を入手できる点にあります。Marius氏から直接購入する場合は取り付けに専門技術が必要ですが、MERKA.G ではボードの組み込みや調整をすべて自社で実施します。そのため、お客様は専門作業を一切行うことなく、届いてすぐ使い始められます。

さらに、MERKA.G では

・クリックトリガー/バンパー

・背面ボタン

・独自フロントシェル

・グリップ背面シェル

・TYPE-C端子化

といった MERKA.G独自のカスタム要素と組み合わせた “完成品” を作り上げることができます。