TEAC AI 503

The AI-503 is an integrated amp and USB DAC that supports inputs up to 11.2MHz DSD and 384kHz/32-bit PCM. The DAC/preamp, which is the heart of the unit, follows the same design concept of our UD-503 and adopts a dual-mono circuit design that is fully balanced. Separate VERITA AK4490 D/A converters - made by Asahi Kasei Microdevices Corporation - are used for the left and right channels. In addition to a USB digital input (for Windows/Mac computers), optical/coaxial digital input and RCA analog input, we have also enabled high-resolution wireless audio listening by including a LDAC-compatible Bluetooth® receiver. Furthermore, with a combined 3.5mm optical digital/stereo mini jack on the front panel, the unit supports wired, as well as wireless, input from DAPs.

The power amplifier uses a Class-D power amplifier (made by ICEpower a/s) that guarantees high resolution during the playback of delicate signals as well as high linearity at high volumes. This unit can power both compact bookshelf speakers (for desktop applications) and large floorstanding speakers. The pre-amp section uses a fully-balanced TEAC-QVCS high-precision volume control circuit with a 4-circuit construction. By maintaining detail levels at all resolutions, the AI-503 creates a very realistic soundstage, along with a high signal-to-noise ratio and excellent sense of space. By connecting an external power amplifier to the fitted pre-out jacks, you can upgrade performance and create an even more capable audio system. The headphone amp section uses a discrete TEAC-HCLD circuit, with a push-pull arrangement, allowing it to drive even high-impedance headphones with ease. The two-stage High/Low gain switch enables optimal volume setting for everything from low-impedance in-ear monitors to high-impedance (600Ω) on-ear headphones. Furthermore, the inclusion of a 3.5mm headphone jack, one that supports a 4-pole separate ground connection, allows excellent channel separation, even when using balanced-type headphones or earphones.

High-performance VERITA AK4490 DACs support 11.2MHz DSD and 384kHz/32-bit PCM

For the DAC chips, the key to high-performance digital audio, we used the highly-regarded VERITA AK4490* DACs, made by Asahi Kasei Microdevices Corporation. Along with native playback of 11.2MHz DSD signals through direct processing, a wide range of high-resolution audio sources (including 384kHz/32-bit PCM digital input) are supported. These DACs enable the reproduction of the finely etched detail and outstanding sense of stereo placement that are the hallmarks of quality high-definition high-resolution audio sources.*The AK4490 is a member of the Asahi Kasei Microdevices Corporation Audio4proTM family brand of products developed for professional audio devices and high-end digital audio applications.

Dual-mono configuration supports fully-balanced transmission

As well as helping deliver class-leading levels of power, the sophisticated dual-mono configuration also extends to the D/A converter and the preamp. The dual-mono layout incorporates two completely independent mono circuits for the left and right channels. Starting with the high-performance VERITA AK4490 D/A converters, this arrangement provides outstanding isolation between the two channels. The suppression of interference between the left and right channels is particularly important when it comes to headphone listening.

Pre-amp section provides fully balanced transmission and uses TEAC-QVCS high-precision volume control circuit

For the preamp circuit, we have utilized the TEAC-QVCS (Quad Volume Control System), an ingenious circuit with a fully-balanced design. It allows balanced processing of the audio signal at every stage, from immediately after digital-to-analog conversion until the signal reaches the volume amplifier.Control signals, transmitted from the volume knob, simultaneously adjust the variable-gain amplifier-type volume controls of four independent circuits — providing a positive and negative for both the left and right channels. Using this system, the unnecessary manipulation of audio signals is eliminated, and the left/right and positive/negative independence of the audio signals is preserved until a point immediately before the power amplifier, achieving a clear sound quality with outstanding channel separation. (This process only applies to balanced analog inputs).What’s more, "gang errors" (level discrepancies between left and right channels at low volumes), which can be a particular issue during headphone listening, have been completely eliminated, so you can enjoy accurate audio even when using low-impedance in-ear monitors.

Features at-a-glance

• DAC with a dual-mono configuration that supports resolutions up to 11.2MHz DSD and 384kHz/32bit PCM
• Separate VERITA AK4490 D/A converters made by Asahi Kasei Microdevices Corporation used on left and right channels
• Bluetooth® receiver that supports LDAC/Qualcomm® aptXTM (as well as AAC and SBC)
• Filter type can be switched, choosing from 2 DSD digital filters, as well as 4 PCM filters and off mode
• Two built-in high-precision dedicated clocks for 44.1kHz and 48kHz signals and their multiples (enabled during USB asynchronous transmission)
• TEAC-QVCS high-precision volume control circuit with fully-balanced structure
• High-output Class-D power amplifier (made by ICEpower a/s)
• Headphone amp with discrete, push-pull circuit and a maximum output of 280mW+280mW (TEAC-HCLD circuit)
• Ground connection supported by 3.5mm 4-pole stereo headphone jack (combined with regular 3.5mm stereo mini type)
• High-capacity toroidal-core power transformers
• Pair of RCA analog input jacks
• Volume-controlled pair of RCA analog output (pre-out) jacks
• USB/coaxial/optical digital inputs (one each on back panel)
• Combined round optical digital/3.5mm stereo mini jack (on front panel)
• Dual analog level meters with adjustable brightness
• Low-energy consumption design and automatic power-saving function
• All-metal enclosure provides both vibration resistance and a stylish appearance in an A4-page-sized footprint that can fit on a desk
• Dedicated remote control included
• IEC inlet
• Compliant with RoHS

Specifications of TEAC AI 503

• Maximum Output Power : 90W + 90W (4 Ω) 
• Rated Output Power : 60W + 60W (4 Ω)
• Impedance : 4 Ω - 8 Ω
• Frequency Response : 10Hz - 60kHz (−3dB)
• S/N Ratio : 100dB
• Connector : USB-B, RCA Coaxial, Screw-type : XLR - RCA - Optical digital : 6.3mm(1/4") stereo phone jack
• Power Consumption : 55W 
• Dimensions (H x W x D) : 81.2 x 290 x 264mm
• Weight : 4kg
• Color : Black - Silver

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