Improved Circuit Board And Functionality Class Ab - zapco Z-150.4 II Owner's Manual

Bottom line, we have improved the amplifier at the same time we brought the
price down. Who ever does that!
Of course, that's just talk, but here's the beef.
For the Class AB full range Competition Amps:
• A new TI op-amp that give the Z considerably better signal to noise ratio,
with a lower floor noise
• We used the same audiophile grade caps that we use in the LX and amps
• We beefed up the power supply with more storage and less internal
resistance and lower inductance for higher efficiency
• We added more MOSFETS to the power supply for efficiency and current
handling
About functionality:
• The end plates are now recessed like the LX amps for a cleaner look
• The plastic controls have been replaced by new metal pots and switches.
The new pots also have detents (like the amps) at 40ea so you can accurately
set crossovers gains identical for right and left channels
• The new Z-II AB amps have band pass crossovers on all models so you
won't need any outboard devices to make a band pass
• x-10 the multiplier switches from the amps are on the New Z to extend
the crossover ranges. This means Z-150.2 II can have higher frequency
crossover for a dedicated tweeter amp and the Z-150.6 II can do tweeter,
midrange, and bass all with internal crossovers
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