Clean Power for audiodevices. Available with USB-adaptor B-to-B or B-to-A, or barrel connectot.
All plugs on request.

One of the best opportunities for sound improvement of USB audio devices:
It's amazing, how much sound improvement you can get from a dedicated low-noise power supply for the USB chip of a DAC and other USB devices like: external harddrives, external CD-drive, Digital-to-Digital convertors, USB headphone amps and other USB-bus driven devices.

For your information: The DAC still needs its regular power supply. Only the USB sector is fed with the AQVOX low-noise power supply, because 95% of all USB-DAC´s gets its power from the computer via the USB cable.

The Problem:
The USB chips of most DACs or the whole DAC are directly powered with the 5 V of the USB cable from the computer. This is called USB-bus powered.
Aside the regular 5 V between 30 mV to 200 mV ripple/noise are transmitted from the computer.
The more dirty the voltage is the more imperfect is the sound performance. Furthermore, most USB and DAC chips generate the digital clock from that 5 V voltage. However, the more the power supply voltage varies or contains noise, the more inexact the generated clock-signal is, resulting in jitter and other sound degrading problems. But clock generation is only one problem. Moreover, the performance of the whole circiutry and chips of the USB device is being affected, thereby downgrading the quality of the output signal significantly.

USB-cables - another sound degrading fact is that the noisy powerlines are affecting the two USB-datalines. Because non of the power- or datalines are shielded. It sounds better if the powerlines are terminated and this is the case if the USB-LowNoise PSU is used.

The Solution:
The powerful, stabilized AQVOX USB Low-Noise power supply has under 1 mV noise voltage. It is equipped with a unique handmade USB adapter, of which one side is being pluged to the USB socket of the DAC or device and the back side takes the USB cable´s plug. Inside that adapter only the two USB data lines are routed through, the 5 V power supply lines coming from the computer are terminated and replaced by the extreamly clean voltage of the AQVOX USB-Low-Noise power supply. No galvanic / electrical connection of the powerlines from the computer.

1. With the AQVOX USB Power Supply the power supply of the USB chip in the DAC is electrically isolated, that means elimination of unwanted ground loops and disturbances.

2. The quality of the power supply of the USB chip in the DAC is drastically improved, resulting in a clearly discernible sound improvement. With most USB DACs the connected computer feeds the USB chip with 5 V voltage power. However, alongside with the regular 5 V voltage 30 mV up to 150 mV noise voltage are being transmitted.

3. Some USB devices lose their settings as soon as the comuter is being switched off. With the AQVOX USB Power Supply those devices keep their settings permanently.

AQVOX Low-Noise USB Power Supply with only approx. 1 mV noise voltage

Technical Specifications:

1. Power supply with conventional transformer (no switching power supply)
2. Stabilized and regulated with approx. 4700 µF filter capacity
2. the powerlines between computer and USB-device are disconnected
3. Output voltage: approx. 5 Volt and powerful 1 Ampere
4. Ripple & Noise: approx. 1 mV  (battery-notebooks or desktop-PCs have 30-150mV Noise in 5V)
5. AC power input: 140 V - 260 V (not suitable for the USA, Canada, Japan)
6. IEC-AC power socket compatible for all countries
7. Short-circuit-proofed
8. USB Adapter: B-male to B-female, 4 cm length (available with other plugs eg. for ONKYO ND S1 please ask)
9. Cable length from Power Supply to USB-Adapter: 150 cm
10. Lenght of the power cord: 150 cm (outside europe we do not provice country specific powercables)
11. Weight: in total approx. 750 g
12. Suitable for many USB DACs, USB hard disk drives, USB Headphone Amps, USB to S/PDIF converters

100mHz digital scope, one vertical square are 10mV.

2. Hard disk drives: The actuators of the recording/reading heads produce interference voltage with each acceleration or deceleration

3. Clock generators and chips of a computer like e.g. the CPU, northbridge, RAM or graphics adapter cause disturbances and noise.

4. Power supplies of notebooks and desktop PCs are not designed for lowest interference voltage and noise, since this is extra costs, not necessarily needed.

and so on...

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