Price - the Classic series is roughly 33% less expensive.
All Types of Pickups - only the Jazz is recommended for both passive and active pickups.
Advantages:
Flexibility - the Pro Z series offers a broader range of sounds. The Z-Mode system allows your pickups to produce multiple tones - brighter - passive - deeper.
Advanced LED Battery Meter - the Pro Z includes an advanced battery meter.
Common Features:
Very transparent sound with great touch response - makes your bass sound better not just louder.
Controls on wire leads can be positioned as required to fit into the holes in your bass.
In most cases you can select from 2 band simplicity to 4 band tone control sculpting in the same number of mounting holes by choosing a configuration with more single or stacked pots.
Tone controls come in 4 configurations - 2 bands - 3 bands - 3 bands with mid frequency switch - 4 bands - each configuration is a different optimized circuit design for the best performance.
Tone controls are natural sounding with flat response center detents and slow engagement curves as you roll out of the detent.
Stereo front end so you can selected either Vol, Balance or Vol, Vol and get the same sound palette.
Select Chrome, Black, Gold knob sets or select third party knobs.
Easy to install - small modules and pots make mounting the preamp in tight cavities much easier.
We use the highest quality parts, for example, check out our custom small industrial control pots or Teflon insulated, highly flexible multi-stranded silver plated military grade wiring...
All units are configured to order - extensively tested while being driven by a real pickup but still shipped quickly (most often 2 business days)