Installation; Unpacking; Unit Positioning - CH A1.5 User Manual

Two-channel power amplifier

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Installation

Unpack the A1.5 power amplifier and store the packaging for future transportation. Be careful when lifting the A1.5 as the unit is

very heavy. Always get someone to help you. When unpacking and installing the A1.5, please remove any rings or watches you

may wear to prevent any damage to the high quality surface treatments.

We recommend to locate the A1.5 power amplifier close to the loudspeaker(s) it drives and connect it by using short loudspeaker

cables.

For best transmission and immunity to external noise, we recommend to connect the A1.5 input to the upstream unit (preamplifier)

using balanced XLR cables.

When delivered from factory, the A1.5 amplifier's four feet sit on elastomer rings, ensuring both scratch-protection for the base on

which the unit sits as well as safe anti-slipping unit positioning. However, a more advanced vibration-channeling mechanical

coupling can be implemented thanks to the steel spikes and the polymer support discs provided with the A1.5. To use this optimal

coupling, simply go through the following steps:

Place the A1.5 unit on a stable base in its approximate final position, for instance in your preferred audio rack. Make

sure cool air is able to freely flow around the unit.

Gently lift the unit's corners and insert a support disc under each foot. The foot's elastomer ring should disappear in the

support disc's groove when properly placed. Carefully check all four feet perfectly fit in each support disc before pursuing

any further. The unit should stably rest on its feet at that point.

Unscrew the four top covers from the A1.5's shafts using the provided suction cup.

Insert the adjustment spikes into the unit's four shafts.

Using the provided screwdriver, gently screw each adjustment spike clockwise until some resistance is felt (just before the

spike starts lifting the unit).

Then screw clockwise each spike by the same amount (for example two full turns).

If the base is flat, the unit should be stable and horizontal. If not, correct the unit's stability and horizontality by

adjusting the required spikes.

If no other CH Precision unit is to be stacked on top of the A1.5, screw the four top covers back. Otherwise, screw the four

polymer stacking covers instead, and gently lay down the unit to be stacked on top of the A1.5. Be very careful that both

units are perfectly aligned in order not to scratch the A1.5's top plate with the other unit's feet. Repeat steps 3 to 8 on

the upper unit.

Rev 1.0

A1.5 User Manual

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