Low-Pass & High-Pass Filters, Bridged Mode

LTO

Installation & Setup Instructions

See how far you can take the volume control before the signal begins to clip (you may need to reduce the amp gain if it gets too loud). If you see it clip on the scope, back off the volume control a little. Now increase the gain on the amp until you find the highest level before distortion or visible clipping. Bear in mind that the maximum level may be limited by your speakers - don't over-drive them.

6Low-Pass & High-Pass Filters

You are able to select either a low-pass or high-pass filter, or switch all filters out (FLAT position). Both filters have a cut -off point that is variable from 50Hz to 500Hz.

When selecting the Low-Pass (LP) filter, the level of frequencies ABOVE the selected cut-off point will be reduced at the rate of 12dB per octave. This is typically used to prevent woofers from attempting to reproduce mid and upper frequencies.

When selecting the High-Pass (HP) filter, the level of frequencies BELOW the selected cut-off point will be reduced at the rate of 12dB per octave. This is used to prevent low frequencies from being delivered to midrange drivers, which could damage the speaker.

When in the FLAT position, the full audio band is allowed to pass and the setting of the variable FREQ control has no effect.

Bridged Mode

Your ADP amplifier has been designed to be used in stereo 2-channel mode only, driving into a nominal impedance load of 4 ohms per channel (minimum). Dedicated high power mono models are available in the ADP range and we do not recommend that you drive your stereo model in bridged mono (single channel) mode, or in tri-mode. However, it is possi- ble to operate your stereo amplifier in bridged mono mode as long as the overall speaker load is no less than 8 ohms.

Typically this would be achieved by wiring two 4 ohm speakers in series.

If you attempt to drive into an impedance load that is too low, the amplifier will cut into its protection mode. This is a de- signed reaction to safeguard the amplifier and does not indicate a fault with the product.