Furutech GT40 USB DAC

The Furutech GT40 has so many positive reviews it's difficult to know where to start:-

Alpha Design Labs 24bit/96kHz GT40 USB DAC with Phono Stage!
The GT40 Harmonizes Computer Files and Analog Inputs

"A Jack of all trades, this little gadget will be one of the most handy boxes yet devised for some hi-fi addicts." ----- Paul Rigby, Hifi Would UK

'If this unit were judged solely on DAC performance it does enough for a five star verdict. But it's way more than that...' ---- What HiFi UK

● USB & Analog Playback and Record multimedia audio system
● Connectivity: USB B Interface, Analog input/output RCA jack
● USB Playback Resolution : 24bit/96kHz
● USB Recording Resolution: 96kHz (Max) supports 32kHz/44.1kHz/48kHz
● Frequency response: 20Hz ~ 20kHz (40Hz: +0.5 dB, 15kHz:-0.5dB)
● SN ratio:-90dB (A-wtd) / Line Output
● Line Output Level: 1 Vrms
● Line Input Level: MC 0.4mV / MM 5mV / Line 1V
● Headphone Output Level: 80mW ( 32 ohm ) Max.
● Power Supply AC Adaptor Rating: AC 9V 0.5A
● Dimensions: 150 (W) x 111 (D) x 57 (H) mm　
● Weight: 785g Approx.

The load (Input Impedance) for the ADL GT40 is fixed at 47K ohm input impedance for both MC and MM.
Maximum Input Level for MM: 5.0mVrms at 1K Hz
Maximum Input Level for MC: 0.4mVrms at 1K Hz
Maximum Input Level for LINE: 1Vrms at 1K Hz


The Gain setting for the ADL GT40 is fixed at 62.5dB for MC and fixed at 48.5dB for MM.
(MC input to LINE output) => 62.5dB @ 1K Hz , +6dB(Line)
(MM input to LINE output) => 48.5dB @ 1K Hz , +6dB(Line)

GT40 has no setting for gain to match different impedance headphones.
We recommend using 16 ohm to 300 ohm impedance headphones. 

The GT40 is finally here, built for enthusiasts with growing music collections on their computer hard drives. It’s a high performance 24bit/96kHz USB DAC that’s amazingly affordable. Looking to convert your LPs or other analog sources to digital? The GT40 will take you to the podium with every album you archive.
The seriously-shielded audiophile-grade GT40 features a low-latency USB 2.0 audio driver that plays and records at 96 kHz. A likely first for this category, the GT40 includes a built-in low-noise MM / MC phono preamp! Record your favorite vinyl to hard disk via the USB output.
The ADL GT40 features L/R analog outputs, and switchable line or phono inputs with a vivid, captivating sound that is simply unheard of in this category.
The ADL GT40 (wired with Furutech’s GT2 USB cable of course!) brings Furutech’s signature sound -- smooth, detailed clarity -- to desktop systems, especially with high resolution 24bit/96kHz files, but even 16bit/44.1kHz files sound impeccable and very musical.
Features
High performance 24bit/96kHz USB DAC and ADC IC chip
Enjoy audio in high resolution at 24bit/96kHz surpassing conventional 16bit/44.1kHz standards
Incorporates the most trusted driver in professional audio for 96kHz recording and playback
External power supply: while a USB-powered device might be convenient, it won’t develop the power required for high resolution playback, so we designed the GT40 with an external power supply to solve the problem.
Headphone Amplifier: It contains a high performance headphone amplifier with ample drive for good headphones
Analog-to-Digital Converter: The GT40 sports a high-performance ADC IC chip for high resolution recordings via analog inputs including phono, AM/FM radio, or other analog signals.
Phono Preamplifier: A first for this class, the GT40 features a phono equalizer for recording your precious LPs. Switch between Moving Magnet (MM) and Moving Coil (MC) or Line input
Highest Quality Parts: The GT40 features a high quality amplifier and condenser supporting its high performance analog circuit
High End Audio Grade Connections: The GT40 is equipped with gold-plated Teflon-insulated RCA jacks with an extremely high quality aluminum chassis and machined volume knob

Please note: The GT40 requires recording software to be installed to record/rip LPs to Hard drive. This software is not supplied with the GT40. There are a variety of free or pay recording software available, so very difficult to make recommendations, but Audacity (http://audacity.sourceforge.net/) is a free-to-download software that is relatively simple to use and very functional. 

Review of the Furutech GT40 in Hi Fi World.

Review of the Furutech ADL GT40 in Hi Fi Choice.

Review of the GT40 in What Hi Fi.