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USB AUDIO INTERFACE from Purebits

Soon an USB Audio interface (2 different models) will be available from Purebits! It has been designed and manufactured with acoustics measurements and Live Recordings purposes, but can be used also for general tasks.

Here are some preview pictures and technical specifications of the first prototypes of the product:

X4 Model

View X4 manual (PDF file)

Download zipped X4 manual

Technical specifications:

2 channel IN / 2 channel OUT USB soundcard (16 bit, up to 48 kHz sample rate (*)), compatible with all Windows versions (no driver required), Linux and Macintosh.
High accuracy A/D and D/A converters from Burr-Brown:
DAC: THD+N 0.005%, SNR 96 dB, Pass-Band Ripple +/- 0.1 dB
ADC: THD+N 0.01%, SNR 89 dB, Pass-Band Ripple +/- 0.05 dB

(*) The soundcard can operate also at a sample frequency of 96 kHz, but the audio bandwidth is limited to 22 kHz.

No external power supply required. Powered from USB port.

Very robust anodized aluminum enclosure.
Compact size: 103 x 53 x 120 mm

2 x 10 Led VU-Meter bar graphs, for accurate input level adjustment.

Can be used as Preamplifier for Microphone and line level.
Input and output stages realized using excellent Burr-Brown operational amplifiers
THD+N 0.0006%, very low noise 5nV/sqrt(Hz), Rail to Rail I/O

4 x inputs, RCA connectors, mixable with stereo input JACK connector. Input 1 and 3 are downmixed to USB input Left. Input 2 and 4 are downmixed to USB input Right. Suitable for Live recording, using 2 or 4 microphones, and for acoustics measurements.

Separate switchable phantom power for channels 1/2 and 3/4, optimized for Panasonic WM6x series electret microphonic capsules (3,6 V).

Input level adjustment realized with high accuracy Cermet potentiometers. Separate knobs for input 1/3 and input 2/4.

Separate Preamplifier/Monitor JACK stereo output. Line/headphone capable.

USB soundcard stereo JACK/2 x RCA output. Line/headphone capable.

Line/Microphone input gain switch.

Digital Input / output. Coaxial and Optical.

Manual selector switch for Coaxial or Optical input (the digital input signal can only be recorded through USB, it is not buffered to monitor output).

FRONT VIEW - BLACK

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REAR VIEW - BLACK

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FRONT VIEW - NATURAL

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REAR VIEW - NATURAL

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X2 Model

View X2 manual (PDF file)

Download zipped X2 manual

Technical specifications:

2 channel IN / 2 channel OUT USB soundcard (16 bit, up to 48 kHz sample rate (*)), compatible with all Windows versions (no driver required), Linux and Macintosh.
High accuracy A/D and D/A converters from Burr-Brown:
DAC: THD+N 0.005%, SNR 96 dB, Pass-Band Ripple +/- 0.1 dB
ADC: THD+N 0.01%, SNR 89 dB, Pass-Band Ripple +/- 0.05 dB

(*) The soundcard can operate also at a sample frequency of 96 kHz, but the audio bandwidth is limited to 22 kHz.

No external power supply required. Powered from USB port.

Very robust anodized aluminum enclosure.
Pocket size: 54 x 23 x 80 mm

Stereo JACK Input connector.

USB soundcard stereo JACK output. Line/headphone capable.

Phantom power optimized for Panasonic WM6x series electret microphonic capsules (3,6 V). Fixed input gain.

Input and output stages realized using excellent Burr-Brown operational amplifiers
THD+N 0.0006%, very low noise 5nV/sqrt(Hz), Rail to Rail I/O

FRONT VIEW - BLACK