Tonewinner AD-99D

Tonewinner AD-99D: the integrated amp that combines power and connectivity

Third generation of the AD-99 series after two models that sold for over a decade, the AD-99D uses Tonewinner’s patented “Super Class A” circuit, already found in the AD-86D and AD-66D models. This 24 kg stereo integrated amp delivers 2 × 180 W into 8 Ω and includes a DAC, a Bluetooth receiver, a file player, and an HDMI ARC input: a concentrate of features in an imposing format.

A power supply sized for dynamics

The 550 VA toroidal transformer takes a central place in the chassis. It powers eight filtering capacitors totaling 69,400 μF, a current reserve that allows the amplifier to respond without faltering to sudden power demands. Transients, those quick note attacks that bring music to life, are reproduced with clarity. Dense orchestral passages or deep bass lines do not cause sagging: the power supply delivers what the power stage needs.

This power supply section is physically separated from the other circuits. The chassis is partitioned into five distinct zones (power supply, inputs, energy storage, left channel, right channel) by metal plates that reduce electromagnetic interference between modules.

The power stage: Toshiba transistors and symmetrical operation

Each channel uses two pairs of Toshiba TTC5200 and TTA1943 transistors, mounted directly against the large side heatsinks. These precisely matched transistors ensure constant linearity across the entire bandwidth (10 Hz to 90 kHz). The input stage uses Texas Instruments OPA1678 operational amplifiers, known for their low noise. Volume control is handled by the NJW1194 chip, the same as in Tonewinner’s AD-3 flagship.

The “Super Class A” circuit combines the qualities of Class A (smoothness, detail) with the efficiency of Class AB. Harmonic distortion remains below 0.01%, the signal-to-noise ratio exceeds 100 dB, and channel separation reaches 80 dB. In practice, this means a silent background and a well-defined stereo image.

Despite the available power and the size of the heatsinks, heat generation remains moderate in normal use. The unit does not require forced ventilation.

The built-in DAC: Analog Devices AD1955

The digital-to-analog conversion section is based on the Analog Devices AD1955 chip, capable of handling files up to 24-bit / 192 kHz. It receives signals from the digital inputs (three coaxial, one optical, HDMI ARC, USB DAC) and from the built-in file player. The latter accepts USB sticks and microSD cards up to 128 GB, with support for FLAC, WAV, APE, MP3, and WMA formats.

The USB-B port allows the AD-99D to be connected to a Mac or Windows computer for use as an external DAC. The signal then goes directly to the amplification section without passing through the computer’s sound card.

HDMI ARC and simplified TV integration

The HDMI ARC input retrieves the TV’s audio signal via a single cable. Content played by the TV’s streaming apps, terrestrial broadcasts, or sources connected to the TV can be amplified without adding extra audio cables. Volume can be controlled by the TV remote on some CEC-compatible models.

Bluetooth SBC and AAC: wireless listening from mobile devices

The Bluetooth receiver supports SBC and AAC codecs with a stated range of 10 to 15 meters. Pairing from a smartphone or tablet is done in the usual way. Quality depends on the source and the codec used; aptX and LDAC codecs are not supported.

Tone controls and subwoofer outputs

The AD-99D offers separate bass and treble adjustment, accessible via the front-panel controls, the remote control, or the Tonewinner mobile app (iOS and Android). Two subwoofer outputs allow the system to be complemented with one or two subwoofers for a 2.1 or 2.2 configuration. Low-pass filtering of the subwoofer signal is handled by the amplifier.

Use as a preamp or as a power amp only

The Pre-Out output and Amp In (Direct In) input are linked by default with a metal jumper. By removing this jumper, the two sections become independent. The AD-99D can then be used solely as a preamp (to drive monoblocks or an external power amp) or solely as a power amp (driven by a separate preamp or a home theater processor).

Technical specifications

Amplification

• Type: integrated stereo hi-fi amplifier, class A
• Power: 2 x 180 W RMS into 8 Ω
• Frequency response: 10 Hz – 90 kHz
• Total harmonic distortion (THD): ≤ 0.01%
• Signal-to-noise ratio: ≥ 100 dB
• Gain: 42 dB
• Channel separation: ≥ 80 dB
• Symmetrical architecture with audiophile-grade transistors
  • Two pairs of Toshiba TTC5200 and TTA1943 transistors per channel
  • Components selected for their audio performance
  • Low distortion and high sonic transparency
  • Perfectly balanced stereo across the entire frequency range

Power supply

• 550 VA toroidal transformer
• Eight capacitors for a total capacity of 69,400 μF
• Large current reserve for high dynamics
• Excellent signal stability, precise and energetic reproduction
• Faithful reproduction of both subtle passages and the most demanding dynamic peaks

Digital-to-analog converter (DAC)

• Chip: Analog Devices AD1955
• Resolution: 24-bit / 192 kHz
• USB DAC connection for computer
• Direct playback via USB flash drive or microSD card (up to 128 GB)
• Supported formats: FLAC, WAV, APE, MP3, WMA

Bluetooth

• Built-in Bluetooth receiver for streaming from smartphone, tablet, or computer
• Range: 10 to 15 m
• Codecs: SBC, AAC

Connectivity

• Analog inputs
  • 3 x stereo RCA
  • 1 x Direct In / AMP IN input
• Digital inputs
  • 3 x coaxial
  • 1 x optical
  • 1 x HDMI ARC (direct connection to the TV)
  • 1 x USB DAC
  • 1 x USB-A (playback)
  • 1 x microSD reader
• Outputs
  • 1 x Pre-Out
  • 2 x subwoofer outputs
  • 2 x speaker terminals

Control and interface

• Remote control included
• ToneWinner mobile app (iOS / Android)
• Physical front-panel controls
• Front display showing the active source and playback information

General information

• Dimensions: 445 x 218 x 456 mm
• Weight: 24.1 kg
• Color: black
• Included accessories: remote control, power cable, quick start guide