Specifications

The power supplies are robust and reliable.They each provide 650 watts of

continuous power, giving the system considerable headroom above its nom-

inal 400 WRMS per channel rating. Each of the two amplifiers is capable of

delivering 400 WRMS, and as much as 1400 watts of instantaneous burst

power.

Why the large difference between WRMS and instantaneous power? WRMS

is a measurement that occurs over a long period of time and is limited by

many factors including thermal considerations. Instantaneous power is a sim-

ple function of the peak voltage supplied to the speaker driver and the

impedance of the driver. Apogee’s APL series' amplifiers use a 75-volt bus (V)

with a 4-ohm driver (R).The instantaneous power calculation is:

Pi = V

/4 = 1406W

An amplifier's ability to handle musical transients is a function of its instanta-

neous power capability.

When installing and using the APL-220, -500, or -800, some simple precau-

tions should be followed.These include:

(1) Maintain Proper Air Flow

The APL-220, -500, and -800 are convection-cooled devices. Convection

cooling is more dependable than forced air cooling because fans are often

unreliable and require high maintenance. Apogee's APL-220, -500, and -800

do not need filter changes to protect the circuitry from contamination by

dust and dirt.The aluminum heat sink mounted on the rear surfaces provides

primary cooling of the system. Care must be taken to locate the loudspeak-

er away from heat registers, heat-generating appliances, lighting equipment,

and any other apparatus that could raise the temperature of the nearby air.

The APL-220, -500, and -800 require unimpeded air circulation in order to

function properly (this is especially important when multiple units are used

in stacked and/or tight-pack configurations).The APL’s rear surface should be

located at least 12" away from walls and/or ceilings. Sunlight and artificial

lighting, especially of the high intensity or theatrical type, should never be

allowed to shine directly on the heat sink.

Installation