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Amplifier Loading Chart (each channel)
Cabinet A’s Impedance (ohms)
Cabinet
B’s
Impedance
Total load on amplifier Note: To prevent overheating and possible loss of signal, do
not use any combination of cabinets that results in a box that is shaded.
Speaker cabinet
loads (ohms) applied
to the amplifier
open 16 8 5.33 4 3.20 2.67 2
open open 16 8 5.33 4 3.2 2.67 2
16 16 8.00 5.33 4.00 3.20 2.67 2.29 1.78
8 8 5.33 4.00 3.20 2.67 2.29 2.00 1.60
5.33 5.33 4.00 3.20 2.67 2.29 2.00 1.78 1.45
4 4 3.20 2.67 2.29 2.00 1.78 1.60 1.33
3.20 3.2 2.67 2.29 2.00 1.78 1.60 1.46 1.23
2.67 2.67 2.29 2.00 1.78 1.60 1.46 1.34 1.14
2 2 1.78 1.60 1.45 1.33 1.23 1.14 1.00
This chart can help you determine what load (ohms) is present on the amplifier when using
multiple cabinets. - To use this chart with two cabinets (A and B), find cabinet A’s impedance (ohms)
column and cabinet B’s impedance row on the chart. The total load on the amplifier is shown in the
box where they meet. For example: If cabinet A’s impedance is 8 ohms and cabinet B’s impedance is
4 ohms, the total load on the amplifier would be 2.67 ohms.
- To use this chart with three or more cabinets, find the total load for two cabinets and then use the
result for cabinet A’s impedance column. The third cabinet will then be used for cabinet B’s impedance
row on the chart. Find the total load on the amplifier and repeat if more cabinets are used. For
example (using 3 cabinets): If the first cabinet (cabinet A) has an impedance of 16 ohms and the
second (cabinet B) has an impedance of 8 ohms, the total load would be 5.33 ohms. Using this load
(5.33) as cabinet A’s impedance and a third cabinet’s (new cabinet B) impedance of 4 ohms, you
would find that the total load on the amplifier is 2.29 ohms. Note: It is not recommended to use any
combination of cabinets that has a resulting load in a shaded area of the chart.
The Profile System Two mixer and speakers have been specifically designed
and optimized for use together as a package. The mixer has been designed to
deliver maximum power with a 4-ohm load on each channel. If you choose to use
different speakers with the mixer, refer to the chart below for loading information.