TEAC HA-501 Headphone Amplifier and UD-501 DAC Package (Black)

Model: WWSHA501UB UPC: 682318783945 Item: 166186

Improve those private listening sessions with this TEAC HA-501 Headphone Amplifier and UD-501 DAC Package. The included headphone amplifier gives your headphones a boost in power and reduced distortion, which greatly improves the quality of the audio and soundstage production. The DAC has the ability to support multiple types of playback through USB, coaxial, and optical inputs, making it a great solution for digitally-sourced music.

This TEAC Headphone Amp & DAC Package includes:

  • HA-501 Dual-Monaural Headphone Amplifier
  • UD-501 Dual-Monaural D/A Converter With USB Streaming

Product Information

This TEAC Headphone Amp & DAC Package includes:

  • HA-501 Dual-Monaural Headphone Amplifier (Black)
  • UD-501 Dual-Monaural D/A Converter With USB Streaming (Black)


TEAC HA-501 Dual-Monaural Headphone Amplifier

A Full-Analog Dual Monaural Headphone Amplifier Designed to Maximize Headphone Potential

Introduce yourself to TEAC’s HA-501, a fully analog, dual monaural headphone amplifier with elegance. Part of the 501 series, this Class-A amplifier delivers superior sound quality, a sleek, modern look, all encased in a rugged but compact design. The HA-501 supplies regular headphone listeners with quality sound, features and adaptable options that cannot be found in regular amplifiers. Pair it with your favorite headphones the same way you would a normal amp with favored speakers and take advantage of DC Servo Technology, Switchable damping Factors, High Output Power, a large Toroidal-Core Power Transformer and relax to your favorite music or radio broadcast.


TEAC HA-501 Amplifier Highlights:

  • A lavishing Class-A Amplifier for superior sound quality. (Full-analog Dual Monaural Discrete design)
  • Active DC Servo Technology to eliminate Offset Electrical Potential, to achieve stable drive.
  • Switchable Damping Factor, to dive diaphragm under the best conditions. (5 positions)
  • 1,400mA/ch (32 ohm loaded) of high output power to drive a high impedance headphones as high as 600 ohms.
  • A Toroidal-Core Power Transformer for stable current supply.
  • Full-metal jacket. Gorgeous aluminum panels for front top and sides. Small footprint fits your desktop.


TEAC HA-501 Amplifier Features:

A headphone Amplifier to Achieve peak headphone performance

  • In general, a headphone output from conventional hi-fi components does not allow even high-quality headphones to perform at their peak potential. The same way one chooses an amplifier to match with your favorite speakers, it is very important to choose an appropriate headphone amplifier that matches your favorite headphones. A headphone amplifier is a "must-have" listening device for audiophiles.

Active DC Servo Technology for decreased distortion, and discrete Class-A Amplifier

  • In order to develop a first-class low distortion Class-A headphone amplifier, TEAC held a series of sound evaluations during the development. These tests led to the careful choosing of parts and discrete circuit design. In addition, like most full-size hi-fi components, in order to eliminate Offset Electrical Potential, Active DC Servo Technology is utilized.

Dual Monaural Design that eliminates interference between Left and Right channels

  • In regards to the circuit design, each channel is completely designed on an individual basis to avoid signal interface to/from another. This contribution eliminates cross-talk, crucial headphone listening.

MUSES8920 Op-Amps - for high-end quality

  • MUSES8920 Op-Amp chip-sets are designed for high-end audio. Employed individually on the Left and Right channels, they help achieve superior sound. This Op-amp performs superb IV-conversion and is already very well regarded and used in a wide-range of hi-fi components.

A Large Toroidal-core Power Transformer

  • An over-sized Toroidal-core power transformer is also employed to supply stable current to the every part of the circuit.

Damping Factor Selector to optimize headphones' characteristic

  • Each pair of headphones has its Damping Factor, a resisting force against non-intentional movement of the diaphragm moving air forwards and backwords as sound. The value of the Damping Factor varies model by model, as diaphragms are made by different materials, in different shapes or different construction designs. Since headphones' diaphragms are activated by a very small current compared to conventional speakers, the damping factor increases, the sound is lean and crisp, and has a close relationship with headphones' impedance. Therefore, selecting the right Damping Factor is crucial in order for your headphones to perform at their peak potential. The HA-501 provides 5 selectable Damping Factors, so users have the best suited signal for multiple headphones.

Total 2,800mA of output power drives your high impedance headphones

  • The HA-501 achieves a remarkable 1,400mW output power per channel at 32 ohms impedance. The device delivers not only enough power to drive standard headphones with an impedance range from 80 to 250 ohms, but also high-class 600 ohms hi-fi headphones.

Robust Aluminum Body with a Classy Appearance

  • Re-defining high class hi-fi components, the HA-501 has a small footprint, classy appearance and is constructed with aluminum panels to create an authentic but modern looking hi-fi component. A robust metal construction helps eliminate vibrations that may affect the sound quality. The bottom and sidewalls are formed with a steel chassis, aluminum for the front panel and the rear panel out of steel. In order to ensure it's rugged design, each panel is connected with a beam that runs through the center of the unit. Normally, this type of construction is only for full-size components, particularly CD players that generate inherent motor vibrations. This construction ensures the HA-501 is an authentic hi-fi component that will last you for many years. Choose between a handsome black version and a brilliant silver version to match with any interior or design.

Well-designed User Interface

  • Another remarkable feature of the HA-501 is the user-friendly design. The firm-torqued volume control allows users to adjust the volume level with ease and precision while the toggle-type power switch assures ON/OFF operation at a glance. Auto-muting function protects your ears from unexpected loud sounds when switching between headphones with different levels of impedance.

Professional grade Input/Output connectors

  • On the rear panel, a pair of NEUTRIK brand XLR input connectors allow users to connect high-end components or professional audio equipment, while wider-pitch RCA pin jacks allow user to connect large-shaft RCA pin cables from other markets. A detachable type 3-polar power inlet socket is also available. On the front, a 3.5mm stereo mini-jack allows users to connect a portable music player such as an iPod, conveniently.

Switchable Output Mode for flexibility

  • Line output level from the rear panel can be switched among "Fixed Level", "Variable Level (coupled with volume)" and "Off".


TEAC HA-501 Amplifier Additional Features:

  • Full analog circuit design
  • Discrete design Class-A Amplifier
  • Dual Monaural design
  • Active DC Servo technology
  • Dual MUSES8920 Op-amps for Left and Right channels
  • 1,400mW + 1,400mW Output Power (at 32 ohms)
  • Damping Factor Selector
  • Over-sized Toroidal-core Power Transformer
  • Full-metal Jacket, Rigid construction
  • A pair of XLR connectors by Neutrik for balanced audio input
  • 2 pair of RCA pin connectors for unbalanced audio input on rear (Gold-plated)
  • 1 stereo audio input on front (1/8" or 3.5mm Stereo Mini Jack)
  • 1 stereo headphone out on front (1/4" or 6.35mm Stereo Jack)
  • 1 pair of RCA pin connectors for stereo unbalanced audio output (Gold-plated)
  • Switchable output line level (Fixed, Variable, Off)
  • +/-15V high voltage operation current achieved high S/N ratio
  • Precisely machined aluminum knobs (Volume, Input Selector, Damping Factor Selector)
  • Auto-muting when headphone plug is disconnected
  • A 3-polar AC socket with a detachable AC cable


TEAC HA-501 Amplifier Specifications:

Audio Input

  • Balanced Input (Rear): 1 pair
    • Connectors: XLR-3-31 (1:GND, 2:HOT, 3:COLD)
    • Impedance: 20k ohms
    • Sensitivity: 2Vms
  • Line Input (Rear): 2 Pairs (LINE 1, LINE 2)
    • Connectors: RCA Pin Jack (Gold-plated)
    • Impedance: 10k ohms
    • Sensitivity: 1Vms
  • Auxiliary Input (Front, AUX)
    • Connectors: 1/8” (3.5mm Stereo Mini Jack)
    • Impedance: 13k ohms
    • Sensitivity: 0.5Vms

Audio Output

  • Headphone Output (Front)
    • Connectors: 1/4" (6.35mm) Stereo Jack
    • Supported Headphone Impedance: 16 ohms - 600 ohms
    • Max Output Level:
      • 1,400mW + 1,400mW (at 32 ohms)
      • 135mW + 135mW (at 600 ohms)
    • Rated Output Level:
      • 600mW + 600mW (at 32 ohms)
      • 34mW + 34mW (at 600 ohms)
    • THD:
      • 0.002% (Input 1V, Output 1V, at 32 ohms)
      • 0.01% (Input 1V, Output 600mW, at 32 ohms)
    • S/N Ratio: 110dB (RCA Input, 2Vrms 1kHz, A-weighted)
    • Frequency Response:
      • 2Hz – 100kHz (+0dB/-3dB)
      • 10Hz – 100kHz (+/-3dB)
  • Line Output (Rear)
    • Connectors: RCA Pin Jack (Gold-plated)
    • Impedance: 100 ohms
    • Output Level: 316mV
    • Output Level Selector: Fixed, Variable, Off


  • Operation Power: 120V AC, 60Hz
  • Power Consumption: 22W (Standby: 0W)


  • Operating Temperature:
    • +5-degrees C to +35-degrees C
    • +41-degrees F to +95-degrees F
  • Operating Humidity: 5% to 85% (no condensation)
  • Storage Temperature:
    • -20-degrees C to +55-degrees C
    • -4-degrees F to +131-degrees C
  • Overall Dimensions: 11.4" (W) x 3.2" (H) x 9.6" (D)
  • Net Weight: 4.1kg, 9 lbs


What's In The Box:

  • AC Cable
  • AC Plug Adapter (3P-2P)
  • Owner's Manual
  • Warranty Card



TEAC UD-501 Dual-Monaural D/A Converter With USB Streaming

TEAC's new UD-501 is the star of the 501 series. The UD-501 supports Direct Stream Digital (DSD) playback at either  2.8 MHz or 5.6MHz (DXD) rates. PCM audio is supported up to 384kHz/32-bit resolution. It connects to your computer over USB using ASIO 2.1 or DoP.

The output section of the UD-501 features two BurrBrown 32-bit DACs per channel and JRC MUSES op amps, also with a dual monaural design. Both balanced XLR and unbalanced RCA outputs are available to connect to your power amplifier. A toroidal-core power supply ensures top performance and clean transient playback, for quality that outperforms components five times its price. 


TEAC UD-501 D/A Converter Highlights:

  • Supports DSD 2.8/5.6MHz playback (via USB)
  • Supports PCM 32bit/384kHz playback (via USB)
  • Supports PCM 24bit/192kHz playback (Coaxial)
  • Supports up to 24bit/96kHz playback (Optical)
  • Supports DSD native playback by ASIO2.1 or DoP method
  • Exclusive driver software for Windows
  • Standard driver software for Mac
  • Asynchronous transfer mode
  • 4 selectable analog filters (playback USB, DSD)
  • 3 selectable digital filters (playback USB, PCM)
  • Non-integral up-conversion to 192kHz, when input signal is less than 192kHz (On/Off selectable)
  • Throughout dual monaural design from power transformer to output section
  • Two toroidal-core power transformers
  • Two BurrBrown PCM1795
  • Four MUSES8920 operational amplifier
  • Parallel buffer for RCA output
  • Power supply to USB circuit is switchable
  • Lineout circuit can be disabled when headphone is used.
  • Low power consumption (MAX 13W)
  • Auto power saving mode (On/Off switchable)
  • Display mode switchable (Show Up-conversion mode and selected filter)
  • Line out switchable (XLR or RCA)
  • Polarity change on XLR (2=HOT or 3=Hot)
  • Full metal body
  • Organic EL Display with Dimmer
  • 1 USB audio input
  • 2 Optical Inputs
  • 2 Coaxial Inputs
  • 1 Stereo RCA/XLR
  • 3-polar AC socket with a detachable AC cable


TEAC UD-501 D/A Converter Features:

DSD 2.8/5.6MHz Native File Playback by ASIO 2.1 or DoP

  • Both 2.8MHz and 5.6MHz DSD files are processed in native mode to properly convert DSD into an analog signal, and skipping PCM conversion in between.
  • ASIO2.1 and DoP (DSD over PCM) playback are also supported.
    • (Mac supports DoP only, with standard driver)

Up to 32bit/384kHz PCM File Playback

  • With PCM file format, files from 44.1kHz/16-bit to 384kHz/32bit resolution are supported.

Asynchronous Transfer Mode

  • Transfer timing is controlled by more accurately by ignoring the clock signal from a PC, nearly eliminating clock-noise and allowing digital data to travel un-affected.

Variety of Digital Filter Settings and Preferences

  • Three types of digital filters are provided for PCM playback, while 4 types of cut-off filters are provided for DSD playback.
  • Also, shutting down unnecessary circuits – USB circuit when S/PDIF input is selected, or Line Out circuit when Headphones are connected – for purer audio processing.

Reducing Jitter Noise by 192kHz Up-Converting

  • With a PCM file sampling at a frequency less than 192kHz, users are able to convert up to 192kHz in order to reduce jitter noise, or keep the original sampling rate to enjoy the original sound.

Dual Monaural Circuits to Eliminate Signal Interference and Maximize Performance.

  • Every single part of the digital and analog sections are designed in dual monaural design to eliminate interfering noise to other channels. This maximizes the potential of the DAC and the operational amplifiers, and achieves a purer audio processing signal.

32bit-compatible BurrBrown PCM1795 on Each Channel

  • The celebrated BurrBrown PCM1795 D/A converter is used on each channel, which supports 32bit audio with a 123dB S/N Ratio.

Dual MUSES8920 Operational Amplifier on Each Channel

  • Two MUSES8920 operational amplifiers are used on each channel. The MUSES8920 was developed for hi-fi components to deliver clear, 3-dimensional sound.

Individual Toroidal-core Power Transformer on Each Channel – Maintaining Total Dual Monaural Design

  • The two toroidal-core power transformers offer a stable current supply with energy-efficient operation. Using a pair of power transformers, one each for the left and right channel, ensures that current is delivered exclusively to each channel.

RCA Output with Parallel Buffer for Better Drivability

  • Two operational amplifiers are connected in parallel with the line out circuit section to improve of line-out signal drive. This helps achieve a more linear analog output signal than any other known method.

A full-metal body, small footprint that can be placed on a desktop

  • The front, side, and top panels are each constructed of aluminum and attached to a robust steel chassis. These heavy parts eliminate vibrations, allowing internal circuits to perform under stable conditions. An A4-size body allows the UD-501 to fit any small space. The Reference 501 series defines a new standard to fit all modern interior, with great space-saving design and a timeless presence.

A Large Number of Inputs & Outputs for Full-Scale Hi-Fi System Integration

  • The UD-501 provides two optical and coaxial digital inputs, one pair of XLR and one pair of RCA analog audio outputs. The RCA lineout jacks have an exclusive clearance zone, so a high grade pin cable with a large shell is able to be connected. The output terminal is selectable to either RCA or XLR. The XLR output connectors have switchable polarity, either pin 2 HOT or pin 3 HOT, to accommodate vintage amplifiers. A standard detachable IEC cable with 3-polar socket allows user to upgrade to high-grade AC cables.


TEAC UD-501 D/A Converter Specifications:

Digital Audio Inputs

  • COAXIAL: RCA jacks x 2 (0.5 Vp-p/75 ohms)
    • PCM data sampling frequency: 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
    • Bit rates: 16/24-bit
  • OPTICAL: Optical digital connectors x 2 (–24.0 to –14.5 dBm peak)
    • PCM data sampling frequency: 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,
    • Bit rates: 16/24-bit
  • USB: Type B connector x 1 (USB 2.0 compliant)
    • PCM data sampling frequency: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz, 384 kHz
    • Bit rates: 16/24/32-bit
    • DSD data sampling frequency: 2.8/5.6MHz

Analog Audio Outputs

  • XLR: XLR jacks x 1 pair
    • Output impedance: 88 ohms
    • Maximum output level: 4.0Vrms (1/full-scale, into 10 kΩ)
    • Frequency range: 5Hz - 80kHz (-3dB)
    • S/N ratio: 115dB
    • Distortion: 0.0015% (1kHz)
  • RCA: RCA jacks x 1 pair
    • Output impedance: 22 ohms
    • Maximum output level: 2.0Vrms (1/full-scale, into 10 k ohms)
    • Frequency range: 5Hz - 80kHz (-3dB)
    • S/N ratio: 115dB
    • Distortion: 0.0015% (1kHz)

Headphones Output

  • Connector: Standard 6.3 mm stereo jack
  • Maximum output: 100 mW + 100 mW (into 32 ohms)


  • Power supply: AC 120 V, 60 Hz
  • Power consumption: Max 13W (Auto power save standby mode: 0.1W)


  • Overall Dimensions: 11.4" (W) x 3.2" (H) x 9.6" (D)
  • Net Weight: 4.0kg (8 15/16 lb)
  • Operating Temperature: +5-degrees C to +35-degrees C
  • Operating Humidity: 5% to 85% (no condensation)
  • Storage Temperature: -20-degrees C to +55-degrees C, -4-degrees F to +131-degrees C


What's In The Box:

  • AC Cable
  • AC Plug Adapter (3P-2P)
  • Stereo RCA Cable
  • Owner’s Manual
  • Warranty Card

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