TAD TAD-M2500TX Stereo Power Amplifier


3,520,000 円 4月中旬

TADL Announces TAD-M2500TX Evolution-Series Power Amplifier
Loaded with Upgraded Features and Performance

Technical Audio Devices Laboratories, Inc., today announced the TAD-M2500TX two-channel power amplifier as the newest addition to its Evolution Series of hi-fi audio components.

The TAD-M2500TX power amplifier boasts a completely redesigned circuit layout, upgraded power transformers, and a redesigned machined aluminum chassis, and provides 550 watts of power per channel at 4 ohms. When connected to TAD speakers in the Evolution Series, the M2500TX delivers powerful sound with exceptional clarity, for which every TAD hi-fi component is known.

Main Features

1) Ultimate symmetry in circuitry and layout

Sources of positive and negative currents that go through a speaker unit’s voice coils must be identical to drive its diaphragm with utmost precision. To that end, the TAD-M2500TX employs a BTL (bridge-tied load) design that connects two separate amplifiers in a balanced configuration for the left and right channels in the amplification circuit from input through output stages. In this design, positive and negative power supplies maintain perfect symmetry between them, and all power supply circuits are designed separately for each channel. The redesigned machined aluminum chassis has no joints and helps reduce the impedance of the grounding point that serves as a reference point for symmetry. Our meticulous effort to achieve ultimate symmetry between left and right channels and between positive and negative signals did not stop there. We redesigned the grounding point not only electrically but also structurally, and redesigned the circuit and its layout in the first amplification stage.

2) High-capacity transformers with greater purity and efficiency

The TAD-M2500TX is powered by upgraded twin high-capacity toroidal transformers with a power rating of 1 kVA each. To increase the purity of power supply, the internal coil of the transformer is directly connected to the power supply circuit, minimizing the contact points with leading wires. Moreover, terminals for directly connected coils, mounting terminals for motherboards, and clamping screws are all made of oxygen-free copper coated with nonmagnetic materials to eliminate even the slightest magnetic distortions. The shape of the cross-section of the transformer core has been redesigned to circular in the TAD-M2500TX, from square in its predecessor. The circular design improves contact between the core and coils, minimizing unwanted leakage magnetic flux and vibrations. The result is a power supply with greater purity and responsiveness, contributing to the exceptionally accurate driving of speaker diaphragms.

3) Power rating of 550 watts per channel at 4 ohms

The TAD-M2500TX delivers an incredible 550 watts of power per channel at 4 ohms. This is made possible by the simplified Class-D single-output-stage consisting of power MOSFET devices with ultra-low on-resistance in leadless packages that boast minimum power losses and high-speed responses. Combined with a machined aluminum chassis with superb heat dissipation, the result is powerful yet responsive and agile sound reproduction.

4) Meticulous vibration-control design

TAD-M2500TX’s chassis is machined from a 90 kg solid block of aluminum. Its heavy and joint-free design eliminates an adverse effect of external vibrations and helps stabilize the ground potential and music signals delivered to speakers. The immense body of the TAD-M2500TX is supported by a three-point support structure with internally inverted spikes, which physically isolates its chassis from external vibrations traveling through the floor. The minimum contact with the surface on which the TAD-M2500TX sits keeps external vibrations from traveling through the feet and adversely affecting circuits and parts inside the case. This elaborate vibration-control design results in more condensed and energetic audio reproduction with spatial nuance of the music retained intact. Heavy-duty, extra-large speaker terminals on the rear panel, similar to the ones found in the Reference Series power amplifiers, reduce mechanical and electrical stress on connected speaker cables to improve their stability and bring out the best of them.

5) Bi-amping option

The TAD-M2500TX offers a bi-amping option for compatible speakers. With this option, one TAD-M2500TX can be connected to the tweeter terminals of right and left speakers, and another to their woofer terminals. The bi-amping connection eliminates interference between speaker units and improves their separation. This option brings out the best of amplifiers and speakers, enabling them to deliver sound with exceptional clarity.

TAD-M2500TX specifications

Power Output550 W at 1 kHz, 4Ω

Rated DistortionLess than 0.05% at 1 kHz, 275 W, 4Ω

Signal-to-Noise Ratio112 dB or higher

Frequency Response10 Hz to 50 kHz, +0 dB/-3 dBGain29.5 dB

Input Terminal
(Sensitivity/Impedance)1.5 V/100 kΩ (balanced input)
0.75 V/50 kΩ (unbalanced input)

Power RequirementsAC 120 V, 60 Hz (United States)
AC 220 V to 230 V, 50 Hz/60 Hz (Europe/Asia)

Power Consumption250 W

Standby Power Consumption0.5 W

Dimensions440 mm (W) × 170 mm (H) × 467 mm (D)

Weight42 kg

企画意図

株式会社 テクニカル オーディオ デバイセズ ラボラトリーズ (TADL)は、妥協しないものづくりにこだわり、最高の音質を目指したハイエンドオーディオ「Referenceシリーズ」と革新的な技術を取り入れた「Evolutionシリーズ」を市場導入しています。
このたび発売する「Evolutionシリーズ」のパワーアンプ「TAD-M2500TX」は、回路レイアウトの刷新や新たな電源トランス、新デザインのアルミ削り出しシャーシの採用などさらなる深化を図り、定格出力550W/4Ωのハイパワーを実現しています。同シリーズのスピーカーシステムとの組み合わせにより、TADならではのパワフルでクリアなサウンドを実現します。

ら新たにアースポイントを設計し、ファーストステージの回路およびレイアウトも刷新するなど、正負左右の対称性を追求しています。

2) 高純度・高効率を深化させた大容量電源トランスを採用

1kVAクラスの大容量トロイダル型電源トランスによる電源回路を改良。電源トランスの内部巻線を直出しすることで、引き出し線との接点を極力削減し高純度化を追求するとともに、直出し線のターミナル、基板マウントターミナル、締結ビスに非磁性のメッキと無酸素銅 (OFC) を採用し、磁性歪を徹底的に排除しています。また、トロイダルコアの断面をスクエア型からリング型へと刷新して巻線との結合を高め、リーケージと振動を大幅に減少させることで、純度が高く、応答性に優れた電源供給を可能にし、正確なスピーカー駆動を実現しています。

3) 定格出力 550W/4Ωの駆動力

低損失と高速性を兼ね備えた超低オン抵抗・リードレスパッケージのパワーMOSFETを採用したシンプルなシングル構成のクラスD出力段は、応答性が高く、しなやかで力強い音質に貢献。また、アルミ削り出しシャーシの放熱構造により、余裕をもって550W/4Ω×2chのハイパワーをドライブする高い出力性能を備えています。

4) 振動制御技術を採用

約90kgのアルミブロックから削り出した新デザインのシャーシは、質量が大きく接合部がないことから外部からの振動に強く、電気的に安定したアース電位を獲得して安定した音楽信号をスピーカーへ送出します。また、スパイク内蔵型インシュレーターによる3点支持構造により、床からの振動影響を低減したISOマウントを実現。荷重ポイントの明確化や床からの振動の影響を低減することで、アイソレーション性能を高め、音の情報量、力強さ、空気感を向上しています。さらに、「Referenceシリーズ」で採用している強固かつ高品位な大型スピーカーターミナルの採用により、機械的、電気的な接続安定度を向上し、スピーカーケーブルの能力を最大限に引き出します。

5) Bi-Amp機能を搭載

スピーカーの各ユニットと各アンプを直結することで、ユニット間での干渉を排除し、セパレーションを向上するBi-Amp機能を新たに搭載。本モデルを2台使用したBi-Amp接続をすることで、アンプとスピーカーが持つ本来の性能を引き出し、歪の少ない澄んだ音を再現します。

主な仕様

定格出力550 W (1 kHz、4 Ω)

定格歪率0.05 % 以下 (1 kHz、4 Ω 275W)

SN比112 dB 以上

周波数特性10 Hz ~ 50 kHz、+0 dB -3 dB

利得 (Gain)29.5 dB入力端子 (感度)1.5 V / 100 kΩ (Balance)
0.75 V / 50 kΩ (Unbalance)

電源AC 100 V、50 Hz / 60 Hz

消費電力250 W

待機時消費電力0.5 W

外形寸法440 mm (W) × 170 mm (H) × 467 mm (D)

質量42 kg


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