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Summary of Contents for Lehmannaudio Linear USB
- Page 1 Linear USB Headphone amplifier / Dual Source Preamp User manual...
- Page 2 - Do not place the power cord near a heating device. Otherwise, the cord sheath may melt, resulting in fire or electrical shock. - Do not locate the Linear USB in a place subject to excessive heat, such as inside a car with all the windows closed, or in direct sunlight. Otherwise, fire may result.
- Page 3 - If you think the Linear USB needs to be checked for maintenance or repair, consult your dealer. - Do not place a container of water or any small metal object on top of the Linear USB. If water is spilled or if the metal object gets inside, fire or electrical shock may result.
- Page 4 Lehmannaudio Manual Linear USB - page 4 - _______________________________________________________________________________________________________________ Why headphones? When you use headphones you can reach a very high level of sound reproduction at a fraction of the price you would have to spend for a regular hifi setup with high quality loudspeakers. Detail resolution and dynamics of even the best loudspeakers can easily be reached with the best headphones.
- Page 5 Lehmannaudio Manual Linear USB - page 5 - _______________________________________________________________________________________________________________ If the power is doubled then the resulting sound pressure level is 3dB higher. If this is calculated the other way round it means that only half of the power is needed when using a headphone with 3dB more efficiency to reach the same sound pressure level.
- Page 6 Lehmannaudio Manual Linear USB - page 6 - _______________________________________________________________________________________________________________ Overview of power consumption of different headphones at different signal levels: level Headphone impedances 32 Ohms 60 Ohms 120 Ohms 300 Ohms 600 Ohms 0,31mW 0,16mW 0,08mW 0,033mW 0,016mV 0,1V 7,8mW...
- Page 7 Purchasing the Linear USB was a perfect step in the right direction. All figures were taken from freely available data sheets of different manufacturers and have been partly recalculated from other dimensions.
- Page 8 This enables you to listen to headphones and your loudspeakers at the same time You can connect to headphones of the same type at the same time to the Linear USB. Please avoid using two different headphones. This may result in very different levels 4.
- Page 9 3. 3,5mm mini jack, Stereo (loop out or input) Mini Jack (stereo) for the connection of any analog source to the Linear USB like for example a tuner, a MP3 player's analog output or the output of an external phono stage.
- Page 10 MP3 player's analog output or the output of an external phono stage. The RCA jacks are hard wired in parallel to the Linear USB’s 3,5mm mini jack. If you are using the 3,5mm input jack for the input signal then the RCA connectors can be used as feed through loop outputs.
- Page 11 . You might have to install a special ASIO support for your player program Adjustment of maximum gain You can easily adjust the maximum gain of the Linear USB to use any available headphone with best results independent from efficiency or impedance. The gain setting has direct effect on the active gain of the input stage which is placed after the volume potentiometer.
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Page 12: Technical Data
Lehmannaudio Manual Linear USB - page 12 - _______________________________________________________________________________________________________________ Technical Data: 47kOhm Input impedance: (analog) 0dB, 10dB, 18dB, 20dB switchable underneath the unit Maximum gain: 0dBFS = 1V (gain @0dB, volume to max.) Output USB-DAC: 32kHz – 48kHz Sampling frequencies:...
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