zapco Z-150.2 AP, Owner'S Manual

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3Ch Mode
It is possible to run the 2Ch amps in “3-Channel” mode by running a pair of speakers for the
mids and highs on left and right channels, and at the same time run a woofer bridged
between the L+ and R- terminals as shown. However, since each channel will see 1/2 the
impedance of the woofer you must use a woofer of no less than 4Ω. The amplifier sees
impedance by frequency, so you can have two 2Ω loads but you must use a passive
crossover on each speaker in the three channel mode. With the crossovers in the line, the
amplifier will always see a minimum load of 2Ω on each channel at all freguencies.
• Main speakers can be 2Ω~4Ω.
• Woofer can be 4Ω~8Ω but cannot be less than 4Ω
2Ω~4Ω
15
2Ω~4Ω
4Ω~8Ω
X-O
X-O
X-O