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TSURANAGI Portable amplifier

The TSURANAGI portable amplifier was developed as an evaluation device for the development of BriseAudio's high-end earphone cables and high-end portable line cables (mini-mini cables) in order to create an ideal portable audio environment. BriseAudio cables are used for internal wiring, and the electromagnetic wave absorbing shielding material and CNT (carbon nanotube) used in our high-end cables such as MURAKUMO and YATONO are installed on the board to further improve the sound quality.

Exterior & battery refresh plans are available.

Q&A about TSURANAGI is set up. We hope you will find this information useful, whether before or after your purchase.

A detailed review of TSURANAGI was published in Head-Fi.

We do not repair modified products. We do not provide parts.


◆Pentaconn 4.4mm端子搭載
◆Output: Balanced (5-pole 4.4mm + 4-pole 2.5mm)
◆High quality sound electronic volume IC MUSES72320 installed
◆Low noise differential line receiver for high input impedance & high common mode noise rejection
◆Low-noise all-differential operational amplifier for unbalanced-to-balanced conversion
◆Low distortion current feedback amplifier to drive headphones
◆Dual power supply and DC servo eliminates input/output coupling capacitors
◆Charging from USB Type C
See below for the latest manual

日本語マニュアルEnglish manual

※写真のプレイヤーAstell&Kern SP1000は接続例です。ラインケーブルは近日発売予定のYATONO-MINI-LE(バランス接続用)です。

Product Concept

近年、バランスLINE OUTを有したプレーヤーや、ヘッドホンやイヤホンのバランス駆動化の増加を受け、ミニミニケーブルやリケーブルの開発のためにBrise Audioが理想とするバランス入出力が可能なポータブルアンプを開発しました。
To allow connection to conventional players, an unbalanced 3.5mm 3-pole input is also provided, which is internally converted to a high-precision balanced signal before being output.
出力端子は5極4.4mm端子と4極2.5mm端子の両方を備えています。 ソースの情報を余すことなく表現することをテーマとし、低歪&低ノイズを基本に設計しました。
The high input impedance of 1MΩ also minimizes distortion of the upstream player output.
The differential line receiver precisely unbalances the balanced signal once and eliminates extraneous noise, enabling clean playback even in noisy outdoor environments.
The power supply circuit uses ultra-low noise & ultra-high PSRR regulators and is supplied independently to each channel.
 A 6-layer board is used to eliminate common impedance and improve signal quality in terms of layout.

TSURANAGI, as with the development of our cables, has a high output, wide bandwidth, no sound distortion, low noise floor, and a low noise floor.
Furthermore, we design for sound quality and performance with the guideline of minimizing the effects of the external environment and extracting as much performance from the equipment as possible.
TSURANAGI is a reference for our cable development environment, and we aimed to create an amplifier that would not spoil the performance and sound quality of the cable.
Cables are also designed to avoid bottlenecks in the equipment, so the aim is to further improve them in-house.

All power supply decoupling capacitors for circuits that perform signal processing are film capacitors and conductive polymer aluminum capacitors.

On top of that, the regulator is designed as an independent supply, so it can follow momentary current consumption.
An ultra-high-performance linear regulator is provided in the stage after the switching regulator to thoroughly eliminate residual switching noise and achieve low-noise reproduction.
These linear regulators are capable of rejecting noise down to the high-frequency bandwidth, so even 2 MHz switching noise is reliably removed.
 Two of the six layers are used for power supply, and the layers are separated by positive and negative, with a GND layer in between to prevent interference.
As with the power supply, GND wiring is also routed on a plane to reduce impedance, while signal GND and power GND are separated not only between channels but also within a channel to the point where they intersect at a single point to ensure thorough separation.
It is grounded to the aluminum chassis at a single point to eliminate GND loops while suppressing external electromagnetic interference.

Reasons for unbalanced conversion configurations

◆Brise Audioが理想とする音質のポータブルアンプの開発にあたって、ソースの情報を余すことなく表現することを目標としました。  
◆In order to maximize the use of the limited resources of portable amplifiers, the unbalanced circuitry in the middle also allows for low power consumption and a large mounting area.

Common mode noise is noise that travels in the same phase with respect to the signal.
Some are transmitted from the player to the cable, and some are transmitted from the space using the cable or other device as an antenna.
If the amplifier lacks common-mode noise rejection capability, noise will leak into the headphones even with a balanced amplifier.
アンプをスマートホンや商用電源に近づけたときに感じることがあるでしょう。 TSURANAGIではそういったノイズは全く聞こえません。
The general purpose of a balanced signal is that if noise is added during transmission (e.g., long cables), the noise can be canceled by taking the difference at the receiving end.
 When taking the difference, it is most important that the common mode noise on the positive and negative signals have the same phase and the same amplitude.
As a cable, the two wires carrying the positive and negative signals are placed adjacent to each other by twisted pair or other means to pick up noise in the same phase and amplitude.
Twisted pairs also have a noise cancellation effect due to magnetic field cancellation, so they are often used for unbalanced signals.
The amplifier side is responsible for taking the difference between the balanced signals.
At that time, if the positive and negative signals are not differentiated with high precision, the cancellation effect will be weakened even though the signals are transmitted in balance.
 When the amplifier actually takes the difference, it inverts the negative signal (even more negative) and adds it to the positive signal.
The gain at this point should not be disparate.
Therefore, the figure shows the case where TSURANAGI had an all-stage balanced configuration and the configuration of a product that performs unbalanced conversion.

If all stages were in a balanced configuration, it would be the headphones that would make the difference.
これによってボリューム回路と電圧増幅段は2ch分でよいため、ゆとりをもった基板レイアウトも可能になり、消費電力も減らす事ができます。 差動ラインレシーバを構成する抵抗が、差分を取る際のゲインを決めています。
It is important that the characteristics of this resistor and the internal OPAMP match in the positive and negative.
Even on unbalanced inputs, the differential line receiver receives single-ended signals as differential signals.
Because of its ability to cancel common mode noise on the signal line and GND, it has a noise advantage over amplifiers with general unbalanced inputs.

Reason for balanced conversion and output

This is partly to achieve a balanced input/balanced output configuration, but there are several advantages to driving in balanced mode in the first place.
In order to make headphones sound, the amplifier must supply a lot of current.
Amplifiers are characterized by the fact that the more current they output, the more prone to distortion.
シングルエンドのアンプですと、ヘッドホンに振幅を送るのはHOT側のみとなりますが、BTLではHOT用アンプとCOLD用アンプの両方で駆動(吐き出しと吸い込み)するため、 ヘッドホンに送ることができる最大の振幅は、同じ電源電圧でも2倍にできます。
Since the voltage is doubled, the current is also doubled, which is why a BTL amplifier can deliver four times more power than a single-ended one.


▶ TSURANAGI (本体のみ) 型番:PA001-S JAN:4589796707479  

We recommend listening to the product if it is less than 16 ohms. Although the product is designed to be driven sufficiently by headphones, some headphones with low performance may not be able to provide sufficient volume.
We recommend theYATONO MINI LE orYATONO MINI Ultimate as the mini-mini cable for balanced connection.

Compatibility table of mini-mini cables to be used in combination with TSURANAGI and each player.

The balanced input of the portable amplifier is an example of use with a fixed 4.4 mm (5-pole) input.
For other balanced inputs,(Please inquire for other types of terminals).

◆4.4mm (player side, line output) to 4.4mm (portable amplifier)
*If GND (5-pole) is connected to the 4.4mm output on the player side, it is here.
RS6, RS8, R5 II, R6 III, R6 Pro II, R8, NewR6, R5(Switching is required on the software side)
KANN ALPHA(Switching is required on the software side), SP3000, SR35, KANN MAX, SE180, SR25 MKII, SP2000T
M11 Plus ESS, M11 Plus LTD, M15S, M17
M3X, M9 Plus
DX320, DX300, AMP8MK2
Luxury & Precision
PAW Gold TOUCH, PAW Gold TOUCH Titanium, PAW 6000
N8ii, N8, N7, N3Pro, N6ii/E02, N6ii/T01, N6ii/A01
◆Connect two 4.4mm & 3.5mm (player side, line output) to 4.4mm (portable amplifier)
*If GND (5-pole) is not connected to the 4.4mm output on the player side, it is here.
NW-WM1ZM2, NW-WM1AM2, NW-WM1Z, NW-WM1A, NW-ZX500 Series, NW-ZX300 Series
◆Connect two 2.5mm & 3.5mm (player side, line output) to 4.4mm (portable amplifier) 
SP3000, SR35, KANN MAX, SE180, KANN ALPHA, KANN CUBE, SP1000, SP1000M, SP2000, SE100, SE200, SR15, SR25, SA700
AK products require line output to be specified in the software.
*Be sure to insert the 3.5mm plug first; if the 2.5mm plug is inserted first, the balanced line output mode will not work.
◆Unbalanced connection (3.5mm to 3.5mm) can be used without any problem.

If a balanced 4.4mm to 4.4mm connection is available, that is recommended.

For players with 2.5mm, 4.4mm, or 3.5mm terminals, a 4.4mm to 4.4mm (with GND connection) straight cable is recommended for sound quality, although a split cable or a 4.4mm to 4.4mm (with GND connection) straight cable may be possible.

As for Walkman, a 4.4mm to 4.4mm (with GND connection) cable is not possible because the GND of the 4.4mm terminal is not connected.

*Please feel free to contact us if you have any questions about products not on the list.   The compatibility list will be updated as needed.

TSURANAGI Specifications table

入力端子 3極3.5 mm 5-pole 4.4 mm (GND connection)
Output Terminal-5極4.4 mm(GND結線) / 4極2.5 mm 
Voltage gain (volume maximum) 10.5 dB 
Max input level at Balanced input※6Vrms / 1.8 Vrms
Max input level at Unbalanced input※5Vrms / 1.8 Vrms
Frequency response (-3dB)  2 Hz - 200 kHz
Recommended load impedance16 ohms or more (if less than 16 ohms, audition required)
Maximum output(16ohm, THD+N<0.01%)700 mW + 700 mW
Maximum output(32ohm, THD+N<0.01%)1000 mW + 1000 mW
Maximum output(300ohm, THD+N<0.01%)100 mW + 100 mW
"THD+N (BW=20kHz, 1Vrms output,16ohm)"< 0.005 %
"THD+N (BW=20kHz, 1Vrms output,300ohm)"< 0.002 %
"THD+N (BW=20kHz, 3.4Vrms output, 300ohm)"< 0.0007 %
Crosstalk (20Hz - 20kHz)< -100 dB
Battery life8 h
Dimensions (W x H x D), excluding protrusion80 mm x 30 mm x 120 mm
Charging terminalUSB Type-C
Battery capacity7.4 V 2800 mAh
Charging time< 5 h (with 5 V2A AC adapter)
mass360 g
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※The clipping conditions are different when the volume is attenuated and when it is at its maximum. Basically, it is acceptable to refer to the time of attenuation.

Stores with TSURANAGI listening devices

We are continually expanding the number of stores where you can audition our product. If there are no stores nearby where you can listen to our product, it is also possible to lend it directly (within Japan).
Despite the equipment being available, if the demo cables are not out in the store, please ask the store staff.

The next shipment is scheduled to arrive in November or later, and we plan to set up a listening device in the store again by November.


Please feel free to contact us, including inquiries about our products.


This is a service that allows you to listen to the music in your own home. This service is available only for residents in Japan.


Go to the TSURANAGI purchase page.

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