Atlas Sound XLT 4.6.3Subwoofer Full-RangeOutput, 4.6.4PowerSense DDP Circuit, 4.7POWER HANDLING

4.6.3Subwoofer Full-Range Output

The subwoofers have a FULL-RANGE OUTPUT designed to connect to a full-range loudspeaker. This output functions as a high pass filter. The signal from the power amplifier connected to the subwoofer passes through this output that filters out the subwoofer frequencies below 150 Hz, and provides the signal for powering the full-range loudspeaker. This is so a single amplifier channel can be used to power both the subwoofer and full-range loudspeaker. (See SECTION 5.1.2 for amplifier load impedances.) For more exacting control of the volume balance between the subwoofer and full-range loudspeaker, separate amplifier channels can be used to power each individually.

4.6.4PowerSense™ DDP Circuit

All crossovers have PowerSense DDP (Dynamic Driver Protection) circuitry that automatically provides thermal and over-current protection for the both the HF driver and the overall loudspeaker. This circuitry senses the power delivered to the loudspeaker. If it exceeds a point that could damage any of the drivers, PowerSense automatically reduces the power to the driver or to the overall loudspeaker. Assuming an amplifier of appropriate size is used, the PowerSense DDP circuit provides a high degree of protection against loudspeaker damage. This proprietary circuitry helps ensure that your loudspeaker will not only keep on performing but keep on performing at its best. PowerSense is active in both PASSIVE and BIAMP modes.

4.6.5PowerSense Indicators

A red PowerSense LED located on the input panel in the back of the loudspeaker will flash anytime the PowerSense DDP circuitry senses excessive power to the loudspeaker. In BIAMP mode the LED will only indicate excessive power for the HF. Light flashes will also be seen through the bass ports from the front of the loudspeaker for either HF or LF overdrive in both PASSIVE and BIAMP modes.

4.7POWER HANDLING

The power ratings in the specifications define the maximum power that can be used for each model. The Program Power rating is the recommended size of the power amplifier to be used with the loudspeaker. The Program rating takes into account that there are momentary transient or peak sounds in the audio signal, such as from percussion instruments. Normally, the loudspeaker can easily handle these peaks so an amplifier equal to the Program rating provides the extra power needed to reproduce them. The RMS (or continuous) rating is the safe amount of sustained power that the loudspeaker can handle, such as might occur with a sustained single note or chord from a synthesizer.

4.8ENCLOSURES

XLT: These enclosures are constructed of OSB (Oriented Strand Board). This wood is a type of composite board specially constructed with the wood grains oriented in one direction. This results in a much stronger material for a given weight than other types of composite wood materials.

XLTE: These enclosures are constructed of 13-ply Baltic birch plywood. Although more expensive than composite woods, various types of birch plywood are used for the enclosures of almost all top-quality professional loudspeakers because of its strength, toughness, and inert acoustic properties.

All XLT and XLTE models have extensive internal bracing, making an extremely strong enclosure that will not resonate or flex, even at maximum bass output. Except for the 41, 48, and 51, all enclosures are trapezoidal. The trapezoidal shape facilitates arraying of multiple enclosures. This shape also allows placement in tight spaces often encountered in both portable situations and permanent installations.

PAGE 13 Community XLT / XLTE Series Owner’s Manual