GETTING STARTED | 4 |
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CONNECTING YOUR SPEAKER CABINETS
The Power 750 is a MONO amplifier. All of the speaker outputs (both 1/4" and Speakon) are in parallel, meaning that they all run off of the same mono power amplifier inside the unit. The number of speaker cabinets you use is your choice, but there are factors that will help you make that choice. Please keep
in mind that the Power 750 delivers 750 watts into one 4 ohm speaker cabinet. Make sure that your speaker cabinet can han- dle the power listed in the "Power Ratings" section of the "Power 750 Specifications" section of the manual.
USING ONE SPEAKER CABINET
First, locate the "Speaker Outputs" section on the rear panel of the unit. Connect the speaker cable of your choice (1/4" or Speakon) from the Power 750 to your speaker cabinet. The impedance of your
single speaker cabinet must be no lower than 2.6 OHMS. In real world terms, this means a single 8 ohm or 4 ohm speaker cabinet will be OK, but not a single 2 ohm enclosure.
BE SURE that your single 8 ohm speaker cabinet can handle at least 450 watts, and that your single 4 ohm speaker cabinet can handle at least 750 watts of rated power.
USING TWO SPEAKER CABINETS
Connect the speaker cables of your choice (1/4" or Speakon) from the speaker out jacks on your Power 750 to the inputs on speaker cabinets. Can you use one 1/4" output jack and a Speakon output jack at the same time? Yes. Remember, all of the Speaker Outputs are coming off of the same mono power amp inside the unit.
If the cabinets are the same impedance, the same amount of power will be sent to each enclosure.
If the cabinets are different impedances, more power will flow to the cabinet with the lower impedance. In a mono situation, equal impedances are ideal since there is no individual control over each cabinet's
volume, but there's no law against using cabinets of different impedances, just so long as the total impedance is equal to, or higher than the amplifier's minimum total impedance (2.6 ohms on the
Power 750, or an 8 ohm and a 4 ohm enclosure connected together in parallel).
In plainer terms, this means you can safely use:
a)two 8 ohm cabinets
b)one 8 ohm and one 4 ohm cabinet
c)three 8 ohm cabinets
And you cannot use:
a)one 2 ohm cabinet
b)two 4 ohm cabinets
Again, make sure to check the power handling capabilities and impedances of the speaker cabinets you wish to use against the "Power Ratings" section of the "Power 750 Specifications" section of the manual.