User manual PYRAMID PA205

[. . . ] Please read this manual throughly before you attempt to set up and use the amplifier. It contains a range of installation suggestions as well as instructions to ensure safe usage. [. . . ] FOR EXAMPLE, IF THREE SPEAKERS OF 4-OHM ARE USED, TOAL IMPEDANCE IS 12 OHMS, YOU SHOULD CONNECT TO THE 16-OHM TERMINAL. 4. Connect the speakers' (-) terminals to the amplifier's COMMON terminal. 5. Connect the speakers' (+) terminals to the amplifier's 4-Ohm, 8-Ohm, or 16-Ohm terminal, depending on the TOTAL IMPEDANCE of the FOUR SPEAKERS. See the chart below for some samples system suggestions: COMBINATION OF TWO SERIES PAIRS IN PARALLEL SERIES TO EACH PAIR (net impedance) 4-OHM + 4-OHM (8 OHMS) 8-OHM + 8-OHM (16 OHMS) 16-OHM +16-OHM (32 OHMS) PARALLEL TO TWO PAIRS (net impedance) 8-OHM + 8-OHM (4 OHMS) 16-OHM + 16-OHM (8 OHMS) 32-OHM + 32-OHM (16 OHMS) TOTAL IMPEDANCE IN THIS TYPE 4-OHM Use this amp terminal 4-OHM System 3:Two (or more) speakers in parallel 1. Connect the LEFT SPEAKER (-) to the RIGHT SPEAKER (-). 2. Connect BOTH the LEFT SPEAKER (-) and the RIGHT SPEAKER (-) to the amplifier COMMON terminal. 3. Connect the LEFT SPEAKER (+) to the RIGHT SPEAKER (+). 4. Connect BOTH the LEFT SPEAKER (+) and RIGHT SPEAKER (+) to the amplifier 4-Ohm, 8-Ohm or 16Ohm terminal, depending on the TOTAL IMPEDANCE of the two speakers. If each speaker has an impedance of 8-Ohm, the total speaker impedance in this parellel configuration is 4 Ohms. 8-OHM 8-OHM 16-OHM 16-OHM + _ Left Speaker + _ This example shows a four 8 Ohm Speakers , the total impedance is 8 Ohms. + _ This example shows a two 8 Ohm Speakers , the total impedance is 4 Ohms. + _ + + _ Right Speaker _ SERIES/PARALLEL VARIATIONS System 4:Four speakers in series/parallel combination 1. Group the four speakers into two pairs. 2. Connect each pair of speakers in SERIES (see system 2 above). If you connect 8-ohm speakers, the total impedance of each pair is 16 ohms. 3. Connect the two pairs of speakers in PARALLEL, If you connect 8-ohm speakers, the total impedance of both pairs is 8 ohms. Note:If each of the four speakers is 8 ohms, the total speaker impedance of the combined series/parallel connection described above is also 8 ohms. Likewise, the total speaker impedance is 4 or 16 ohms, if the speakers are 4 or 16 ohms respectively. 5 Although the description above is for combining TWO SERIES PAIRS in a PARALLEL hook up, you may also select to combine a SERIES PAIR and a PARALLEL PAIR in a PARALLEL hook up. Simply be sure you have properly calculated the total impedance, and connect the (+) speaker circuit wire to the proper amp terminal. For example, if you use a SERIES PAIR of 8-Ohms speakers (the total impedance is 16 ohms) and a PARALLEL PAIR of 8-Ohms speakers (the total impedance is 4 ohms) in a PARALLEL hook up, the TOTAL IMPEDANCE of this system is 3. 2 OHMS, so you should connect the (+) speaker circuit wire to the 4OHM terminal. See the chart below for some samples system suggestions: COMBINATION OF ONE SERIES PAIR AND ONE PARALLEL PAIR IN PARALLEL SERIES TO ONE SPEAKER PAIR (net impedance) PARALLEL TO ONE SPEAKER PAIR (net impedance) TOTAL IMPEDANCE COMBINING TWO PAIRS IN PARALLEL Use this amp terminal 4. Connect the speaker's (-) terminals to the transformer's COMMON tap on the secondary side. NOTE:Before connecting the speakers, please be sure the total wattage of the primary tap you use does not exceed the amplifier's maximum power rating, PA105 20W and PA205 40W. [. . . ] Connect the supplied DC power cable's barrel plug to DC 12V IN jack on the amplifier, and then connect the cable's other end to the 12-volt accessory socket on the vehicle, such as the cigarette-lighter socket. CAUTIONS: PLEASE UNPLUG THE AC POWER CORD BEFORE CONNECTING THE DC POWER CABLE FOR THIS 12V POWER USAGE, AND DISCONNECT THE DC POWER CABLE BEFORE PLUGING IN THE AC POWER CORD FOR AC POWER USAGE. THE VEHICLE USING FOR THIS POWER SOURCE MUST HAVE A NEGATIVE GROUND ELECTRICAL SYSTEM. CAUTION:Setting output level too high can overdrive the amplifier, causing permanent damage. Using the MIX BUS jack You can connect another PA105/PA205 to this jack to double the size of your PA system. [. . . ]