1 Technical highlights
CH products are proudly designed and manufactured in Switzerland by CH Precision Sàrl. Our engineers have put all their know-
how into bringing you the A1, a top performances future-proof modular two output channels power amplifier with USB flash-drive
firmware update and Ethernet control capabilities. As all CH Precision products, the A1 is highly versatile: a single A1 can be used
as a stereo power amplifier (with two mono input boards), or a pair of A1 can be used as mono power amplifiers. Even in
monaural mode, 4 setups are possible: left /right mono mode (the transformer of each A1 is dedicated to a loudspeaker, but only
one output board is used), bridged mode (to nearly quadruple the available power per channel), passive bi-amp (each channel
powers a specific speaker driver) or active bi-amp (when an active crossover network is placed between the preamplifier and the
A1). Moreover, multiple A1s can be chained for ultimate performance, using multiple A1s per speakers.
For increased flexibility, the A1 also provides two unique features: global/local feedback ratio and gain adjustments. The amount
of global feedback in the amplifying loop of each channel can be adjusted to best match virtually any speaker on the market. The
amplifier gain can also be adjusted over a 24 dB wide range, by 0.5 dB steps. This also greatly helps in matching the output level
of the preamplifier, the efficiency of the connected loudspeakers and the listening room. Three standard input connectors are
available (balanced XLR, single-ended RCA and BNC). Unbalanced inputs can be configured as high impedance input, or a 300
Ohm load can be engaged to match the output of 50 or 75 Ohm D/A controllers or preamplifiers. A pass-through XLR line-level
output is also provided for daisy-chaining multiple A1s.
A1 main components
Rev 2.0 A1 User Manual 7
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