1 Technical Highlights
CH products are proudly designed and manufactured in Switzerland by CH Precision Sàrl. Our engineers put together all their
know-how, expertise and ingeniousness to bring you the L1, a top performance future-proof modular two channel preamplifier
with USB flash-drive firmware update and Ethernet control capabilities. Like all CH Precision products, the L1 is highly versatile: 3
configurations are possible: Dual Monaural (the L1 holds two channels in a single chassis), Monaural (two L1s work together, each
one processing a single channel, one board in each chassis) and finally the Monaural Extended (two L1s work together, each one
processing a single channel, however with two boards in each L1 chassis, allowing twice the amount of inputs). All these
configurations can be further enhanced by adding the X1 External power supply.
The L1 is a fully symmetrical design, pure Class A discrete transistor based circuitry. This results in ultra low noise, high bandwidth
and high slew rate performances. The signal stays in the analog domain all the way through. By default, the L1 is configured for
no series capacitor throughout the signal chain. The volume control is based on a discrete 20 bits R-2R resistor network circuit
topology, providing a range of 118dB in 0.5 steps. The output stage is designed to be able to deliver ample current to drive heavy
loads and/or multiple pieces of equipment simultaneously. The L1 uses tight tolerance, high-grade metal film resistors throughout
the audio signal path.
Balanced XLR, single-ended RCA and BNC connectors are available at both the input and output. All the inputs can be configured as
high-impedance input, or a 600 Ohm load can be engaged on balanced inputs (300 Ohm for single-ended inputs) to reduce
reflections as well as to improve external noise immunity, therefore improving the overall signal transmission.
L1 main components
8 L1 User Manual Rev 1.0
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