CH Precision A1.5 Two-channel Power Amplifier CPO Certified

Faced with exactly the same challenges as the M1.1, the A1.5 
embodies the same sophisticated, modular and scalable 
approach. It might be (slightly) smaller than the M1.1 and 
around two-thirds of its weight, but it’s still four amplifiers
in one. It still offers the same adaptable, software controlled
topology, adjustable input configuration and gain, user 
selectable global feedback ratio and cost-effective upgrade 
path. It offers exactly the same, incredibly short signal path, 
fully discrete, fully balanced and fully complementary circuit,
built with the same carefully selected components to the same
exacting standards. Even the casework, although shorter, has 
the same footprint, uses the same construction and includes 
the same mechanical grounding/stacking system. In fact, in 
every important way, the A1.5 is, quite literally, an M1.1 writ 
small – or, in Hollywood terms, “Honey, I shrunk the amp…”
But in this case, loss of weight doesn’t mean a loss of 
quality. The power transformer and reservoir capacitance 
are identical in type and design to those in the M1.1. The 
A1.5 inevitably delivers less power than our Reference 
amplifier, but with a conservatively rated output of 150 
watts/channel, it’s definitely no lightweight, performing 
with real dynamic range and authority – and it does it 
all at a considerable saving in cost. It might not match 
the awesome headroom capabilities of the M1.1 under 
the most demanding loads, or do it in the largest of large 
rooms, but in many systems and with many speakers you 
simple don’t need or can’t use that capacity. Combine the 
A1.5’s impressive real-world performance and increased 
affordability with its adaptable, configurable topology and 
suddenly you have a serious slice of M1.1 performance – 
but in a much more manageable package.
With the same transparency, resolution and engaging, 
communicative musical qualities as the M1.1, the A1.5 is an 
incredibly capable and convincing performer, the perfect 
partner for a whole host of high-quality speakers. In any 
other range it would be the flagship model and it delivers
performance to match. But what happens when the upgrade
urge strikes, you can accommodate bigger speakers or you 
want more from your system? As impressive as a single A1.5
undoubtedly is, adding a second A1.5 to your system unleashes 
the monster within, because, just like the M1.1, the configurable 
input/output topology of the A1.5 makes it an amplifier that, 
once doubled up, becomes considerably more than the sum 
of its parts. User configurable, via the front-panel buttons 
or the CH-Control App, the A1.5 is not only conventional 
stereo amplifier: it is a high-current mono-bloc; it is a high-power bridged mono-bloc and perhaps most important 
of all, it can be adapted for bi-amping, a single input being 
routed to both channels. That not only saves on the need for 
additional interconnects, the gain and global feedback ratio 
can be set independently for each channel, allowing further 
control over bass output and room matching. But most 
critically of all, vertical bi-amping maximizes dynamic range 
and system headroom, allowing the A1.5 to grow with your 
speakers’ demands and your musical and system ambitions. 
The A1.5 – the not so ‘little’ power amp that punches well 
above its weight!