
WATATSUMI
Next-generation reference portable amplifier of Brise Audio
Overview
◆Pure analog balanced input/output portable amplifier
◆最大導体量の純銀線を採用
◆Internal high quality sound processing optimized for pure silver wire
◆Provides balanced output even for unbalanced input signals
◆Input: Balanced/Unbalanced (5-pole 4.4mm / 3-pole 3.5mm)
◆Output: Balanced (5-pole 4.4mm)
◆Incorporates circuit technologies developed through FUGAKU (BIS2.0, BOS1.5, BPS1.5)
◆Compared to TSURANAGI-V2: Maximum output at 16Ω increased approximately threefold to 2000mW+2000mW, THD+N reduced to one-third, and residual noise reduced by half
◆Equipped with the high quality sound processing electronic volume IC MUSES72320
◆Drives headphones with a low-distortion current feedback amplifier
◆Eliminates input/output coupling capacitors by using dual power supplies and a DC servo
◆Upgraded from a conventional extruded aluminum chassis to a more robust CNC-machined aluminum structure
◆フォージドカーボンやウルトラスエード®を採用し、使用感と質感を向上
◆Approx. 8 hours of continuous playback (may vary depending on usage conditions)
価格 :オープン
Reference price: ¥680,000

An article about WATATSUMI has been published on AV Watch. April 25, 2025
Brise Audio's most powerful portable amplifier, “WATATSUMI,” enters the world of “FUGAKU.” A universal earphone is also in development!?
https://av.watch.impress.co.jp/docs/topic/special/2002396.html
For more information about our circuit technologies (BIS, BOS),click here.
Product Concept
To keep up with the evolving environment surrounding portable amplifiers in recent years, we have developed WATATSUMI as the next-generation reference portable amplifier.
The original TSURANAGI was developed as a reference evaluation environment for cable development.
This portable amplifier features 4.4mm balanced input and output, which has become the mainstream in portable audio, while pursuing sound quality that does not become a bottleneck for our cables.
More than four years have passed since the release of the original TSURANAGI, and our cable lineup has evolved alongside it.
At Brise Audio today, we offer a diverse range of models, including SHIROGANE, which uses pure silver conductors, and OROCHI, which incorporates a large volume of conductors.
In recent years, the high-end earphone market has seen an increase in low-impedance earphones, leading to greater demands for low-noise performance in amplifiers.
At the same time, there has been a rise in high-end headphones that require large amounts of power, increasing the demand for amplifiers capable of high output.
Taking these factors into account, we developed WATATSUMI to redefine our high-end cable evaluation environment.
WATATSUMI inherits the concept of the original TSURANAGI while aiming for improvements in every aspect.
To achieve this, we completely redesigned the circuit from the ground up and adopted the low-noise BIS2.0 input stage used in FUGAKU.
The output amplifier has also been upgraded to BOS1.5, increasing the maximum output to 2000mW+2000mW at a 16Ω load—approximately three times higher than before.
The PCB layout was also fundamentally optimized by leveraging the expertise and knowledge we have accumulated over the years.
The power supply circuit has been updated to BPS1.5, providing more stable voltage and significantly contributing to deeper and more grounded low-frequency reproduction.
In addition, the internal wiring uses pure silver wire with a greater conductor volume than SHIROGANE, and high quality sound processing has been applied to electronic components to ensure compatibility with a wide range of cables and players.
The year 2025 marks the 10th anniversary of Brise Audio. WATATSUMI is a special model that represents the culmination of our portable amplifier development, incorporating all the expertise we have gained through TSURANAGI, FUGAKU, and SHIROGANE.
Features of WATATSUMI
PRODUCT LINE-UP
▶WATATSUMI (main unit only) Model number : PA003 JAN:4570113633885
WATATSUMI Accessories
・USB charger
・USB Type-C charging cable
・Product ID card
・Warranty card
アンバランス | バランス | |
---|---|---|
入力端子 | 3極3.5 mm | 5極4.4 mm(GND結線) |
出力端子 | - | 5極4.4 mm(GND結線) / 4極2.5 mm |
電圧ゲイン(ボリューム最大) | 10.5 dB |
---|---|
バランス入力時最大入力 (ボリューム減衰時/ボリューム最大)※ | 6Vrms / 1.8 Vrms |
アンバランス入力時最大入力 (ボリューム減衰時/ボリューム最大)※ | 5Vrms / 1.8 Vrms |
周波数特性(-3dB) | 2 Hz - 200 kHz |
推奨負荷インピーダンス | 16 Ω以上(16Ω未満の場合は要ご試聴) |
最大出力(16ohm, THD+N<0.01%) | 700 mW + 700 mW |
最大出力(32ohm, THD+N<0.01%) | 1000 mW + 1000 mW |
最大出力(300ohm, THD+N<0.01%) | 100 mW + 100 mW |
"THD+N (BW=20kHz, 1Vrms出力,16ohm)" | < 0.005 % |
"THD+N (BW=20kHz, 1Vrms出力,300ohm)" | < 0.002 % |
"THD+N (BW=20kHz, 3.4Vrms出力,300ohm)" | < 0.0007 % |
クロストーク(20Hz - 20kHz) | < -100 dB |
バッテリー持続時間 | 8 h |
寸法(W x H x D), 突起部含まず | 80 mm x 30 mm x 120 mm |
充電端子 | USB Type-C |
バッテリー容量 | 7.4 V 2800 mAh |
充電時間 | < 5 h (5 V2AのACアダプタを使用) |
質量 | 360 g |
公式ストア | 購入する |
※ボリューム減衰時と最大時でクリップする条件が異なります。基本的には減衰時を参照していただいて構いません。
ポータブルアンプのバランス入力は4.4㎜(5極)固定での使用例です。
それ以外のバランス入力に関してはお問い合わせください。
◆4.4mm(プレイヤー側・ライン出力) to 4.4mm(ポータブルアンプ) ※プレイヤー側4.4mm出力にGND(5極)が接続されている場合はこちらです。 |
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Hiby |
RS6, RS8, R5 II, R6 III, R6 Pro II, R8, NewR6, R5(ソフト側で切り替えの必要あり) |
Astell&Kern |
KANN ALPHA(ソフト側で切り替えの必要あり), SP3000, SR35, KANN MAX, SE180, SR25 MKII, SP2000T |
FiiO |
M11 Plus ESS, M11 Plus LTD, M15S, M17 |
Shanling |
M3X, M9 Plus |
iBasso |
DX320, DX300, AMP8MK2 |
Luxury & Precision |
LP6, P6PRO |
Lotoo |
PAW GT2, PAW Gold TOUCH, PAW Gold TOUCH Titanium, PAW 6000 |
Cayin |
N8ii, N8, N7, N3Pro, N6ii/E02, N6ii/T01, N6ii/A01 |
◆4.4mm & 3.5mmの2本を接続(プレイヤー側・ライン出力) to 4.4mm(ポータブルアンプ) ※プレイヤー側4.4mm出力にGND(5極)が接続されていない場合はこちらです。 |
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SONY |
NW-WM1ZM2, NW-WM1AM2, NW-WM1Z, NW-WM1A, NW-ZX500シリーズ, NW-ZX300シリーズ |
◆2.5mm & 3.5mmの2本を接続(プレイヤー側・ライン出力) to 4.4mm(ポータブルアンプ) |
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Astell&Kern |
SP3000, SR35, KANN MAX, SE180, KANN ALPHA, KANN CUBE, SP1000, SP1000M, SP2000, SE100, SE200, SR15, SR25, SA700
※AK製品はソフトウェア側でライン出力を指定する必要ございます。 ※3.5mmプラグを必ず先に挿入してください。2.5mmプラグを先に挿入するとバランスライン出力モードになりません。 |
◆アンバランス接続(3.5mm to 3.5mm)であれば特に問題なくご使用いただけます。 |
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バランス接続の4.4mm to 4.4mmで接続可能な場合はそちらを推奨いたします。
2.5mm、4.4mm、3.5mmの端子を持つプレーヤーの場合、分岐ケーブルでも4.4mm to 4.4mm(GND結線有り)のストレートケーブルでも可能な場合がありますが、音質的には4.4mm to 4.4mm(GND結線有り)のストレートケーブルを推奨いたします。
Walkmanに関しては、4.4mm端子のGNDが未接続なため、4.4mm to 4.4mm(GND結線有り)のケーブルが不可です。
※OROCHI-MINI Ultimateでは2.5mm + 3.5mm to 4.4mmの接続が必要な機器には対応していません。
※一覧に無い製品などご不明な点はお気軽にお問い合わせ下さい。 対応表は随時更新いたします。
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