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ENGLISH
Performance specifications
Headphone Outputs (Outputs 1-2)
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Output impedance: < 10 Ohms
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Power output into 150R: 15mV
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Power output into 50R: 30mW
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THD+N: -100dB (0.001%) (-1dBFS input, 20Hz/22kHz
bandpass filter, 150R load)
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Signal to Noise Ratio: > 105dB
S/PDIF Digital Input
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Automatic Sample Rate conversion
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Supported sample rates: continuous from 32kHz to 192kHz
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THD+N: < -110dB any sample rate
Crosstalk (Channel Isolation)
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Any output to output: > 100dB
Digital Performace
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D/A Dynamic Range: 120dB (A-weighted)
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Measured D/A Dynamic Range: 108dB (A-weighted)
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Clock Source: Internal Clock only
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Clock jitter < 250 picoseconds
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Supported Sample Rates: 44.1kHz & 48kHz.
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2 input channels to computer: S/PDIF (2).
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2 output channels from computer: Headphones (2).
Connectors and Controls
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Stereo S/PDIF input on RCA
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Stereo Headphone Output on ¼” TRS
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Headphone Output Level control (analogue)
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4-pin USB2.0 compatible socket
Indicators
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1 Green LED Indicator:
Flashing: Unit not installed correctly on host
Off: VRM effects turned off
On: VRM effects turned on
Power
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Bus power from USB bus.
Weight and Dimensions
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Dimensions: 68mm x 25mm x 68mm (W x H x D)
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Weight: 123g
Latency and CPU information
The VRM Box processing takes place at a driver level on your computer.
This process incurs a 64 sample latency (about 1ms). The VRM processing
also uses a certain amount of CPU resources.
The VRM Box driver will also add additional latency. This latency will
depend on how you use the VRM Box:
When using the VRM Box as your audio interface in your DAW, the latency
you experience will be dependant on the audio buffer size you set in
your DAW, and in most DAWs the actual latency figure is displayed in the
preferences. If the audio buffer size is set to less than 64 samples, then the
VRM processing does not have enough time to do the processing and no
audio will pass. VRM CPU requirements are much higher when the audio
buffer size is set too low, so it is recommended that a buffer size of 512
samples (Mac) or 10ms (Windows) should give the best starting point.
When using the S/PDIF input (receiving audio from another audio interface),
the latency figure will be dependant on the audio buffer size you set in your
DAW for that interface, PLUS additional latency from the VRM Box. In this
case, there will be latency incurred from the transfer of S/PDIF audio sent
from the VRM Box via USB using the VRM audio driver, through the VRM
processing, then back to the VRM Box. The total round trip latency is likely
to be in the region of 20ms (depending on computer specs).
For more detailed information please refer to the Focusrite answerbase:
www.focusrite.com/answerbase
Copyright
Focusrite is a registered trade mark of Focusrite Audio Engineering Limited.
The Focusrite logo, VRM Virtual Reference Monitoring and the VRM logo
are trade marks of Focusrite Audio Engineering Limited.
All other product names, trade marks, or trade names are the marks of their
respective owners, which are in no way associated, connected nor affiliated
with Focusrite or its VRM Box product. These other product names, trade
marks, and trade names are used solely to identify and describe the third
party loudspeaker systems, the sonic behaviours of which were studied for
the VRM technology incorporated within the VRM Box, and to accurately
describe an element of functionality within the VRM Box.
The VRM Box is an independently engineered technology which utilises
Focusrite’s VRM Virtual Reference Monitoring (Patent applied for) to ac
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curately measure examples of the sonic impact of original loudspeaker
systems upon an audio stream, so as to electronically emulate the perform
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ance of the original product studied. The result of this process is subjective
and may not be perceived by a user as producing the same effects as the
loudspeaker systems studied.
2010 © Focusrite Audio Engineering Limited. All rights reserved
