The Well-Tempered Computer

Audio4Soul Reference 50 True Digital Amplifier €3.420

Amplification by PCM to PWM (Pulse Width Modulation) conversion.

Inputs: USB (XMOS, driver provided for Win systems) 24/192, Coaxial S/PDIF 24/192, Optical S/PDIF 24/96,

Ethernet with DSP optional and WAV,FLAC,AIFF decoding ability.

Power: 2*125@8ohm

Thd+N: 0,01% 20Hz-20KHz@full power

S/N: better than 112Db

Weight:17Kg

April music Stello Ai500 Integrated Amplifier $3495 USD

Output Power	150 Watts/CH @ 8 Ohms, 300 Watts/CH @ 4 Ohms
Output Stage	Quad Para Push-Pull Hitachi MOSFET Power Transistors, Class AB
Power Supply	Custom Made 800 VA Toroidal Transformer 90,000 uF Capacitor Bank
Frequency response	20~45 kHz
THD + N	< 0.05 %
Volume control	Cirrus logic CS3310 digital volume control
Analog inputs	3 unbalanced analog line inputs 1 balanced analog line input 1 BYPASS input
2 Analog Outputs	Pre-out, REC
4 Digital inputs	COAX, OPTIC, PC USB Link, iPod COAX : up to 192 kHz / 24 bit PC USB, OPTIC : up to 96 kHz / 24 bit
Front Panel	POWER, BALANCED, CD, TUNER, AUX, DIGITAL, BYPASS, MUTE, Rotary Volume Encoder
Full Function Remote Control
Dimension	460 (W) X 86 (H) X 400 (D) mm
Weight	16 Kg (Net.)

Audio Space

Mini Galaxy One Stereo Integrated Amplifier ($899,-)
Output Power : 2 x 13W (Ultralinear-Class AB Push-Pull)
S/N Ratio : >88 dB
Output Impedance : 4, 8 ohm
Input Mode : RCA / USB (For PC, I Pod)
Vacuum Tubes : EL84 x 4, 12AX7 x 2

USB specs not available on the website so probably limited to 16 bits/48 kHz.

Bel Canto Design e.One S300iu

Integrated amplifier with 300 Watts of dual mono balanced power capability per channel.

USB specs not available on the website so probably limited to 16 bits/48 kHz.

Chord CYAN Click Digital Integrated Amplifier

Unbalanced Input: 1 pair RCA phono

Balanced Inputs: 1 pair of 3-pin female XLR inputs

Digital Inputs: Coax BNC, TOSLink Optical, B type USB

Wireless Input: Bluetooth A2DP

Signal to Noise Ratio: -90dB all inputs

Frequency Range: 2.5Hz – 200kHz (-3dB)

USB specs not available on the website so probably limited to 16 bits/48 kHz.

Price: $8500 High Power Version (100W rms)

Classe CP-800 US$ 6000.00

One of the inputs: asynchronous USB.

Full support of Apple’s iPod®, iPhone® and iPad® range of products.

According to the press release:

"the CP-800 can surpass the performance of conventional disc playback systems," said Dave Nauber, EVP of brand development. "A storage device like an iPod or computer can contain all the data of the original recording, so it has the potential to be an audiophile source," he said. "The challenge is to clock that data into the D/A converters at precisely the right time, which the CP-800 achieves through newly-developed recovery and clocking technology."

Available late 2010

Dared MP-5 €330

13 W integrated amplifier.

USB specs not available on the website so probably limited to 16 bits/48 kHz.

Electrocompaniet PI 2D Integrated Amplifier €3.150

2 x 100 Watts integrated amplifier.

Digital inputs: two Coax, two TOSLink and one 24/192 asynchronous USB

Analog input: 1 balanced XLR input and four single ended RCA inputs.

Technical specifications:
• Input impedance ( Single Ended ): 60 kOhm
• THD + N: < 0.005%
• Output Impedance: < 0,03 Ohm
• Frequency response: 1 – 225kHz
• Channel separation: > 120 dB
• Noise floor ( 1Vrms, 20 - 20 kHz, balanced): <-130 dB
• Damping factor: >300
•Rated output power
8 ohms 2 x 100 W
4 ohms 2 x 165 W
2 ohms 2 x 220 W

Gato Audio DIA-250 Integrated Amplifier $4,500

2x 250W@8ohm / 2x 500W@4ohm
Class D output stage
Built in 24bit/192kHz D/A converter with upsampling
Coax, optical and asynchronous USB digital input up to 24bit/192kHz
Accepts digital streaming directly from Apple iPad
Two unbalanced and one balanced inputs
Nonmagnetic enclosure
Direct function; enables use in home theater sytems

Added 1/2014

Luxman DA-200 USB DA Converter $2,199.00 USD

Pre-amp / headphone amp with analoque and digital inputs.

Single ended and balanced out + digital out.

COAX/OPT input: 32kHz, 44.1kHz, 48kHz, 88.2kHz and 96kHz, 176.4kHz and 192kHz
USB input: 32kHz, 44.1kHz, 48kHz and 96kHz
16 - 24bit 2ch PCM

Outlaw Audio RR2150 Stereo Receiver US$ 699

100 W stereo receiver with USB.

USB specs not available on the website so probably limited to 16 bits/48 kHz.

Parasound Halo $2'495

2.1-channel integrated amplifier with 160 Watts x 2 @ 8 Ohms (RMS, both channels driven)

ESS Sabre32 Reference DAC (ES9018K2M)
Asynchronous USB 2.0 supports PCM up to 384kHz/32-bit
Native and DoP DSD decoding (Drivers for ASIO or WASAPI)
Coax and optical accept PCM up to 192kHz/24-bit

Added 3/2015

Peachtree Audio Decco65 US$ 999

Amplifier
Class D amp modules 65 watts per channel <0.5%
distortion into 8Ω, 95 watts per channel <0.5%
distortion 4Ω, 20Hz-50kHz +/- 0.1dB

Preamplifier
Hybrid tube design (triode 6N1P) 5V output @ 2.0V input
Max output: 7V rms / 11.2V peak
Class A output stage <50Ω

Headphone Amplifer
Class A output with 6N1P tube in the circuit
Maximum output power: 100mW into 8 Ohm / 300mW into 150 Ohm / 150mW into 300 Ohm
Output impedance: <30Ω
Suitable for all electrodynamic headphones

DAC
ESS Sabre 9023 Upsampling 24/192
Sampling Rates : 44.1, 48, 88.2, 96, 176, 192
USB Asynchronous up to 24/192
Optical Up to 24/192
Coax Up to 24/192
<3ps jitter measured at master clock