rockford's 3 channel from 2channel amp?

http://www.rockfordfosgate.com/rftech/library/2000/3_Amplifiers/MAN2616A_PowerAmp_MAN.pdf

can any body explain what is trying to be done on page 20 of the manual? and also the ohm load that would be on each channel?

thank you squirrel i can understand that

Impedance is relative to frequency. The diagram doesn't show the impedance of the stereo speakers nor does it show the impedance for the speaker wired in mono, it only shows the lowest recommended speaker impedance for each. If all speakers had a nominal impedance of 4 ohms and the high pass and low pass frequencies for each filter were the same, for example 80Hz, the amplifier would see a 4 ohm load per channel from 80Hz and up and a 2 ohm load per channel from 80Hz and down. If the low pass frequency for the speaker wired in mono was 100Hz and the high pass frequency for the speakers wired in stereo were 80Hz, the amplifier would see a 1.33 ohm load per channel between 80Hz and 100Hz,  and from 100Hz and above it would see a 4 ohm load per channel, and at 80Hz and below it would see a 2 ohm load per channel. Obviously if the amplifier is not stable below 2 ohms per channel then overlapping crossover points in this configuration using all 4 ohm speakers would not be recommended.

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