The Ultimate Desktop DAC and Headphone Amp
The NuPrime DAC-10H is a DAC & Headphone Amplifier offering PCM 384K& DSD256 decoding.The DAC-10H’s balanced headphone amplifier is capable of driving headphones in balanced and single-ended configuration and can be used with up to two dynamic headphones. With five digital & two analog stereo inputs, the DAC-10H is a full-featured DAC and preamp more than suited for any high-end system.
1. Fully integrated DAC & Headphone Amp offering PCM 384K & DSD256 decoding.
2. Accommodates all digital signal formats.
3. Capable of driving headphones in balanced and single-ended configurations and can be used with up to two dynamic headphones.
4. A full-featured DAC and a preamp suits for all high-end systems.
- 1 x USB Digital
- 2 x Coaxial Digital S/PDIF
- 2 x Optical Digital S/PDIF
- 2 x Analog Stereo RCA
- Optical (up to 24 bit/192 kHz)
- Stereo RCA (Line out)
- Stereo Balanced (XLR-3 socket pre-out )
- Balanced headphone amplifier (XLR-4 socket )
- Unbalanced headphone amplifier (6.3 mm jack socket )
- USB Sampling Rates: 44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz, 192KHz, 352.8KHz, 384KHz and DSD 2.8MHz (DSD64) , 5.6MHz (DSD128) 11.2MHz (DSD256)
- S/PDIF Sampling Rates: 44.1KHz, 48KHz, 88.2KHz, 96, 176.4KHz, 192KHz
- Maximum Sampling Rate: 24-bits
- Bit Resolution: 16-24-bits
- Frequency Response: 10Hz to 80kHz
- Max. output power: 680 mW @ 1 kHz and 600 ohm load at the XLR-4 output
- Frequency response: < 10 Hz to > 100 kHz
- Crosstalk attenuation: min. 93 dB @ 1 kHz
- THD+N: < 0.0003%
- Dynamic range: > 115 dB @ 600 ohm load (A-weighted)
- Dimensions: Height: 24 inches (60.9 cm) Width: 14 inches (35.5 cm) Width: 14 inches (35.5 cm)
- Weight: 10.5 pounds ( 4.8 kg )
- Worldwide AC voltage: (90VAC~130VAC // 210VAC~ 250VAC) With Voltage Select Switch
- AC Fuse: Slow-blow,T2.5A, 250VAC
Very nice achievement, as mechanical electronics, for NuPrime DAC-10H with a solid essentially made of solid aluminum casing and a steel bottom plate 2 mm thick lined with a thick aluminum plate, in turn, to 3 mm.
Deep, the housing accommodates a large map that hangs up the entire electronics except the display and headphone amplifiers. All these people will draw its energy from a power supply built around a toroidal transformer nice size.
The USB interface is provided by XMOS processor that will extract the I2S bus and the DSD signals from the USB bus data. It is a circuit Asahi Kasei AK4113 (24 bit 192 kHz) which is responsible for the interface and the switching of S / PDIF inputs, while switching between I2S bus from the S / PDIF inputs and one derived from XMOS processor toward the digital-analog converter chip is provided by a multiplexer 74HC157.
The analog digital converter is a model manufacturer ES9018K2 SEA, a chip using the technology Hyperstream (a sample rate conversion) working on 32-bit and capable of decoding PCM signals up to 384 kHz frequency sampling and the DSD signals to 11.2 MHz.
Active filtering after conversion is built around operational amplifiers with very low noise and low distortion LM4562 manufactured by National Semiconductor.
This is a 72320 Muses circuit JRC manufacturer (New Japan Radio Company) used volume control . This resistance switching circuit offers a very high control accuracy and identical attenuation on both channels, which is very important for eavesdropping low volume where a level difference is very sensitive, and it works in conjunction with a high-performance amplifier Audio Special National Semiconductor LME49860 dual operational.
Also found in this area of the map OPA2134 dual operational amplifiers whose role seems to be the change in gain on headphone outputs and line outputs. Near these amplifiers are actually tiny integrated circuits that are marked NFHS certainly MOS switches on or off putting services resistors that change gains.
The signals intended for line outputs (photo below) are then assigned to double operational amplifiers OPA2134 Burr-Brown, one of these amplifiers keeping their phase, while the other of the opposite and are switched through relays to XLR balanced outputs. Unbalanced signals also pass through a OPA2134 amplifier to maintain the same color on the standard sound outputs.
It is also noted that the two analog inputs are buffered by operational amplifiers OPA2134.
As for the signals for the headphone outputs, it is transmitted via a strand son to map amplifiers using amplification ICs helmet stamped with the initials NuForce, but we were able to identify the pins of the power supply and inputs and outputs amplifiers and these correspond to pin pin to those of the integrated amplifier TPA6120 helmet of Texas Instruments.
Maybe is it a special model manufactured to specifications NuPrime loads or developed by the brand by taking the pinout of the TPA6120 but this second hypothesis seems unlikely.
One of these works in stereo amplifier to power the Jack 6.35mm output via a conventional way relay, while the other two work in bridged mode (or bridged in English) on each channel Stereo and are connected via two relay the four pin XLR socket.
We also note the presence of a dual operational amplifier OPA2134 generating antiphase signals necessary for bridged amplifiers.
Symmetric power amplifiers are manufactured by separate windings of the transformer and uses L7815 and L7915 controllers. Each amplifier IC is powered through a high-pass filter choke-capacitor-type (LC) using a ferrite choke on and capacitor 470 uF / 35V. This type of filter is particularly effective in removing waste recovery.
The micro management controller electronics is a model Nuvoton W78E065A working on 8 bits, the -C is powered by its own regulator + 5V and can be seen just off three other regulators mounted radiators, namely a L7805 (+ 5V) and L7812 and L7912 providing symmetrical voltages of + or – 12V operational amplifiers and volume control located on the main board.
electrochemical filter capacitors are manufactured to specifications NuPrime loads and do not contain any indication of value, but we would say, at first glance, it could be models 4700 uF / 25V.