Yamaha A-U671 Integrated Stereo Amplifier With USB DAC (Black)

Model: A-U671 UPC: 027108953212 Item: 165874


In Stock
Shipping Information
Show Store Details
104 E Vine St. Hatfield, PA 19440
  • Mon - Fri: 9am - 5pm
  • Sat: By appointment only
  • Sun: Closed
(866) 961-7781
Show Store Details
754 Route 309 (Bethlehem Pike) Montgomeryville, PA 18936
  • Mon - Fri: 9:30am - 6pm
  • Sat: 9:30am - 5pm
  • Sun: 12pm - 5pm
(215) 368-8343
Show Store Details
38 Greenfield Avenue, Ardmore, PA 19003
  • Mon - Fri: 10am - 6pm
  • Sat: 10am - 5pm
  • Sun: Closed
(610) 649-7002
Choose a Store Location

More Product Details

Questions? We're here to help.

Yamaha's A-U671 Stereo Amplifier Delivers on Power and Elegance

Bring out the absolute best in your high-resolution tracks with the Yamaha A-U671 Integrated Stereo Amplifier. It's the perfect addition to any existing sound system, with a boost of power that creates a more vibrant and realistic soundstage. Built with a USB compatible DAC, digital audio sound is given priority treatment and ensured to display native playback without inhibiting the natural sound. You can also plug your headphones in for a clean, private audio experience!

Product Information


  • Powerful, built in digital amplifier
  • DSD 5.6 MHz and PCM 384 kHz playback
  • High-grade USB DAC functionality
  • ESS SABRE32 DAC (ES9010K2M)
  • Five-way speaker binding posts (stereo)
  • Analog audio input (stereo)
  • Subwoofer output
  • Pure Direct technology 
  • 70 W + 70 W (6 ohms, 1 kHz, 10% THD)
  • Dimensions: 12.38” W x 2.75” H x 13.5” D
  • Weight: 7.3 lbs
  • Warranty: 2 years
  • World Wide Stereo 60-day guarantee and expert product support

Yamaha's Highest Quality Digital Sound 

Looking for a modern digital amp to fit you audio needs? You won’t find a better optionthan our Yamaha A-U671 Integrated Stereo Amplifier with USB DAC. It’s an awesome piece of technology that takes your MP3 and hi-def audio files’ 1’s and 0’s and turns them into magnificent sound. Plus, it’s perfectly headphone-matched for reference-quality sound in your ear - only a Yamaha stereo amplifier brings this level of versatility! 

What’s in a Name?

Ever notice that so many rockers’ instruments are made by Yamaha? This is no coincidence. Specializing in providing professional-grade audio for generations, Yamaha makes some of the best instruments and sound systems on the planet. Now, with the A-U671, put some of that experience to work in your own stereo setup or home theater.

Circuital Power

Featuring an output of up to 70 watts per channel, the A-U671 is able to portray absolutely everything in various high-resolution sources. Built around simple, strong circuits, this unit is able to deliver high bass purity while ensuring high- and mid-range warmth. It’s natural and uncolored, a feature of the power amp’s low-pass filter.

Digital Music, Meet Digital Amp

Amplify your hi-def files in the same format they’re stored in -- digitally. Capable of supporting high-resolution DSD-128 native playback -- with an incredible 5.6 million samples per second -- the A-U671 is truly an hi-def audio-native amp. Finishing these complex innards, its SABRE32 DAC is bonded to an asynchronous-transfer USB device controller for a true USB DAC - Yamaha doesn't skimp on the important features of a modern digital amp.

Pure and Direct

In modern electronic circuitry, current passes through many “gates” -- and each gate the circuit passes through causes infinitesimal signal degradation. This is what causes distortion in the sound output. The A-U671’s Pure Direct Mode solves this. By having sound signals bypass the buffer amp, tone, and loudness and balance controls, the signal doesn’t degrade, and distortion is nipped in the bud.

The Headphone Lover’s Amp

Looking for a headphone amp? Look no further. As a pure digital amp, the A-U671 is one of the best-quality headphone amps on the market. Boasting rich and high-quality digital-analog conversion, this amp is perfect for hi-def audio codecs. Enjoy your headphones as they pipe reference-quality sound straight into your ears.

High-resolution audio with original Yamaha design. With USB DAC functionality, enjoy DSD 5.6 MHz and embrace a new world of digital audio playback.


Yamaha A-U671 Integrated Stereo Amplifier Highlights:

  • DSD 5.6 MHz and PCM 384 kHz playback with high-grade USB DAC functionality
  • ESS SABRE32 DAC (ES9010K2M)
  • Five-way speaker binding posts (stereo)
  • Analog audio input (stereo)
  • Subwoofer output
  • Pure Direct
  • 70 W + 70 W (6 ohms, 1 kHz, 10% THD)


Yamaha A-U671 Integrated Stereo Amplifier Features:

Natural PWM-type Digital Power Amp That Reproduces High-resolution Sound Sources with Remarkable Purity

  • In order to vividly portray absolutely everything in various high-resolution sources; from the nuances in the most delicate performances to the highest energy-filled dynamic musical passages, Yamaha has built into this amplifier a digital power amplifier that outputs up to 70 watts per channel and features powerful drivability. Natural PWM type digital modulation with an extremely simple circuit configuration provides both natural, uncolored sound quality with higher efficiency. The low-pass filter of the latter part of the power amp, which significantly influences the sound quality, is a large coil made of low-loss, low-distortion OFC (oxygen-free copper) wire material. This simultaneously maintains the purity of high-resolution sound sources, while enhancing the power of the bass and ensuring warmth in the mid and high-frequency sounds. This delivers the best quality sound reproduction that is rich in musicality. This amplifier also features a Pure Direct switch that bypasses the tone / balance controls and a back buffer amp to improve the purity of sound as well.

DSD 5.6 MHz and PCM 384 kHz Playback with High-grade USB DAC Functionality

  • Built into the unit is an exceptionally high-grade USB DAC which can reproduce high-resolution sound sources with all their original quality. It is compatible with native playback of DSD 5.6 MHz (DSD128) or 384 kHz / 32-bit PCM which records music information with extraordinary detail by sampling up to a massive 5,644,800 times per second. The D/A converter is the high-performance SABRE32™ (ES9010K2M) from the U.S. company, ESS Technology, and its USB device controller IC is from the latest product from XMOS®. By restricting shutter noise through asynchronous transference, this delivers pure reproduction and optimum sound quality.

Fully Enjoy the Quality of High-resolution Sound Sources with Your Favorite Headphones

  • Another major benefit of the A-U671 is the availability to use it as a high-quality headphone amplifier. With the USB DAC function, mixed with its internal high-performance D/A conversion, high-resolution sound sources will sound their purest.


Yamaha A-U671 Integrated Stereo Amplifier Specifications:

  • Maximum Output Power: 70 W + 70 W (6 ohms, 1 kHz, 10% THD)
  • Frequency Response: 0 ± 3 dB (10 Hz - 40 kHz)
  • Total Harmonic Distortion (CD to Sp Out, 20 Hz - 20 kHz): 0.05 % (SP Out, 1 kHz, 6 ohms)
  • Signal-to-Noise Ratio (CD): 95 dB
  • Input Sensitivity (CD): 230 mV / 47kΩ
  • USB Input: Yes (Type B)
  • USB DAC Supported Format: DSD 2.8 MHz / 5.6 MHz, FLAC / WAV / AIFF 192 kHz / 24-bit, Apple® Lossless 96 kHz / 24-bit playback
  • Headphone Out: Yes
  • Subwoofer Out: Yes
  • Standby Power Consumption: 0.4 W
  • Dimensions (W x H x D): 12-3/8” x 2-3/4” x 13-1/2”
  • Weight: 7.3 lbs.



Customer Reviews for Yamaha A-U671 Integrated Stereo Amplifier With USB DAC (Black)

There are no reviews for this item. Write Review


Customer Q & A

Have a functionality, compatibility, or otherwise product-specific question about this product? Ask it here! If you have a customer service or shipping question, please direct it to our customer service department

Start typing your question and we'll check if it was already asked and answered. Learn More
No questions have been asked about this item. Be the first!