L.PASS Préamplificateur MOSFET / Contrôle de Volume / Sélecteur de Source

L.PASS Préamplificateur MOSFET / Contrôle de Volume / Sélecteur de Source

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Reference : 13944
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149,17 €tax excl.

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Produit garantie 2 ans

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preamplifier L.PASS

MOSFET preamp / Volume control / Source select


The L.PASS 2.0 is device that combines the functions of preamplifier, volume controller and source selector.

 It is an ideal choice for a compact / medium audio system since it allows to connect 4 analog sources on a single power amplifier.

This type of circuit is particularly useful for joining multiple sources especially in any system where Home Cinema & Hi-Fi devices converge on the same set of speakers.

The preamp stage operates in class A with MOS-FET components.

The entire circuit has an oversized linear power supply (60V available against a 40Vppm preamplifier stage dynamics). Either a comfortable reserve to significantly limit the distortion.

All functions are accessible from the front panel: Volume Control / High Gain / Source.

Volume Control


The volume control is operated from a stereophonic ALPS potentiometer on the front panel. This directly  drives the MOSFET-based preamp stage.

The L.PASS preamplifier offers three profiles for preamplification :  low gain, medium gain and high gain. Respectively: 6dB / 12dB / 18dB on the preamplifier. Note that this parameter affects the input impedance ( > 20K low gain / > 50K high gain).

The class-A circuit is integrated in order to maximize heat dissipation :  each FET tube is mounted on its own heatsink and the whole preamplification stage is ideally located under the housing air holes to promote air circulation.

Select source


The device has four unbalanced inputs RCA stereo connectors. The source selection is done directly from a button on the front. 4 LEDs with markings act as active source indicator. Note that the marking is not name-based (Ina, Inb, Inc, Ind instead of traditional CD , DAC, TV ... markings)

The source commutation works via a series of relays in order to avoid "thumps" when changing source.

Select source
Inputs4 x stereo RCA (unbalanced)
Outputs1 x stereo RCA (unbalanced)
Gain6dB (low)
12dB (medium)
18dB (high)
Max output voltage> 40vppm
Output impedance<200Ω
Input impedance> 20K (low gain)
> 50K (high gain)
Power supplylinear Regulated
220V AC
Consumer power<25W
Weight2.7 Kg
Dimensions58 mm (Height)
220 mm (Width)
190 mm (depth)

L.PASS is delivered alone without any accessory

Package Contents
preamplifier L.PASSx1
Data sheet
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