Unmatched Flexibility; Operation Modes - CH A1.5 User Manual

(1) Output coil for HF immunity
(2) Custom Argento Audio speaker terminals
(3) Monaural analog input boards (each A1.5 can be equipped with 1 or 2 such boards)
(4) Standby fuse
(5) Mains voltage selector
(6) Mains power switch
(7) Mains filter
(8) IEC C20 power cord receptacle
(9) Power fuse
(10) USB (firmware update) and ethernet RJ-45 (control) board
(11) Adjustment shafts
(12) Power supply regulation boards
(13) Heatsink-mounted monaural amplifier boards
(14) Heatsink-mounted rectifying diode bridges
(15) User interface buttons
(16) Custom rectifying capacitors
(17) Main analog star-ground oxygen-free copper plate
(18) Custom standby transformer (ensures green mode Standby)
(19) AMOLED display (on front panel)
(20) Custom high power transformer

1.1 Unmatched flexibility

The A1.5 offers unmatched system integration features. Not only does it provide multiple modes of operation (stereo, monaural,
bridge and active or passive bi-amplification) but it also provides adjustments to match speaker impedance and sensitivity through
feedback and gain controls. The operating modes are user-selectable either from the A1.5 amplifier's front panel or from the CH
Control app running on a tablet. In addition, multiple CH amplifiers can be daisy-chained for ultimate performance in multi-
amplification systems.

1.1.1 Operation modes

The A1.5 integrates two channels of amplification and can be fitted with a single or two input boards. When fitted with a single
input board, two power amplifier units are required (one per channel) and the pair provides the following modes of operation:
Bridge mode: In this mode, each A1.5 operates as a very high power mono amplifier and can deliver up to 550 Watts
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under 8 Ohms. Bridge mode is optimal for high impedance speakers in large rooms, requiring large voltage swings.
Monaural mode: In this mode, the entire power supply is dedicated to a single amplification channel and each A1.5 unit
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can deliver up to 700 Watts under 1 Ohm. It is optimal for low impedance speakers, requiring large amount of current.
Passive bi-amplification mode: Used with loudspeakers fitted with multiples sets of terminals. In this mode, each A1.5
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operates its two channels of amplification in parallel, fed from the same input signal. Each channel drives a different set
of loudspeaker terminals. Feedback ratio and gain can be adjusted independently for each channel to best match the
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