User manual PYRAMID 801

[. . . ] It can be used for live bands, office paging systems, public announcements, or a variety of other installations. TABLE OF CONTENTS 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 Features and Controls, XPA-100. XPA-200. XPA-300 Installation Guidelines Input Connections Connecting a CD, DVD or tape player or tuner Connecting an equalizer or signal processor Stereo or Mono Inputs Speaker connecitons Bridged Mode Operation Connecting to standard AC power Mounting the amplifier Turning the amplifier on Using the power LED meter Using the channel1 and channel2 output level controls About the internal clip circuitry Caring for your PYRAMID Amplifier Resetting the circuit breaker Specifications Limited warranty INSTALLATION GUIDELINES Connecting the GND (Ground) screw terminal Connecting a mixer or preamplifier may cause excessive noise or hum in the amplifier output. To prevent this, connect one end of a low-capacitance shielded wire to the amplifier's ground screw (on the rear panel). Then connect the other end of this wire to the ground terminal on the mixer or preamplifier enclosure. PREAMP OR MIXER Stereo or Mono Inputs Your PYRAMID XPA amplifier can be operated in Stereo, Mono or Bridged mode, depending on the input source. [. . . ] If the input signal is mono, slide the Stereo/Mono/Bridged selector switch to MONO and the signal will be routed through both channels. If you wish to run the amplifier in bridged output mode, slide the switch to Bridged. Speaker connections You can connect 4 Ohm, 8 Ohm or 16 Ohm speakers to Channel 1 and/or Channel 2 of the amplifier. If you connect two pairs of speakers, be sure to follow these guidelines: · Speakers which are connected to the same channel are part of a pair, and must be of the same impedance. · Speakers connected to different channels are NOT part of a pair, and can be of different impedances. Prepare the speaker wire by removing about 1 inch of insulation from the end of the speaker wire you intend to connect to the amplifier. NOTE: Use 16-gauge speaker wire for lengths up to25 feet; 14-gauge wire for lengths over 25 feet. Connect the speaker wires to the speaker's positive and negative terminals. Using the power LED meters The meter pointer position indicates the amplifier output power. Using the Channel 1 and Channel 2 Output Level controls Rotate output level gain clockwise to increase, or counterclockwise to decrease the output power. To get the best performance with the least sound distortion, always adjust the output level gain so the meter's pointer does not continuously exceed the extreme right of the meter's scale. CAUTION: It is possible to overdrive the amplifier by setting output level gain too high, which may cause damage or failure. About the internal protect circuitry Special clip circuitry incorporated into your PYRAMID XPA amplifier's design protects the amplifier and speaker system from being damaged from overdriving power. Under normal conditions, the amplifier's clip indicator will flicker as the output power momentarily exceeds the level as set by the output level gain selector. Bridged Mode Operation This amplifier can operate in a mono bridged output mode, if your speakers can handle the following power output levels: XPA-100: XPA-200: XPA-300: 1000 watts 1600 watts 2000 watts CAUTION!Do not use balanced and unbalanced inputs simultaneously!! As shown in the diagram below, connect the speaker's positive (+) to the amplifier's red speakers left (1/2) terminals and negative (-) to red speakers right (1/2) terminals. The speaker right (+) on the amplifier is used as a negative (-) terminal for a bridged connection. [. . . ] Do not use balanced and unbalanced inputs simultaneously!! As shown in the diagram below, connect the speaker's positive (+) to the amplifier's red speakers left (1/2) terminals and negative (-) to red speakers right (1/2) terminals. The speaker right (+) on the amplifier is used as a negative (-) terminal for a bridged connection. NOTE: The extra amplifier output of 6. 35mm phone jacks can not be used for the bridged connection. [. . . ]