Owner's Manual

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
• HP crossover can be FULL or can be HPF to be used between 15Hz and 25Hz as
sub sonic filter
• LP crossover must be set to FULL
• All actual crossover functions will be done by the passive crossovers in the lines
X-O X-O
2 OHM MIN LOAD
4 OHM
MIN LOAD
X-O
1514
Speaker Wiring of the SP Amplifiers
The Very Basics
• No speaker wires can be shorted to, or touching either ground or each other. This will
put the amp into protect and may damage the amplifier
• When bridging the left and right channels of any SP amplifier, you use the left
channel (Ch1) positive and the right channel (Ch2) negative, as indicated on the
chassis by the speaker terminals
Z-150.2 SP / Z-400.2 SP Speaker Wiring
Stereo Mode
• Commonly a pair of full range speakers with x10 swt. off (out or x1 position) and
HPF set between 70Hz~100Hz to protect the speakers from deep bass
• To use for tweeters put Multiplier switch to x10 (pushed in) and set HPF between
2000Hz~5000Hz, as per the tweeter makers recommendation
• To use for midrange: Determine the range of frequencies you want. Put the LPF/BPF
Multiplier switch to x10 (pushed in) and set the LPF filter to the highest frequency
you want to have. Set the HPF filter to the lowest frequency you want to have
Single Channel Mode
Bridged to one voice coil using L+ and R-
• Commonly for a woofer. Set crossover mode to LPF/BPF with Multiplier to off (x1)
• Set LPF freq. to woofer maker’s recommendation. Set HPF crossover frequency to
20Hz to use as a sub sonic filter