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For those who aren't familiar with Gizmos, they are a device we designed to improve the fidelity of Lowther full range drivers.  You can find information about them at the bottom of the following article:

https://www.decware.com/paper30.htm

Steve

The EX mod on a Zen amp targets the power band towards higher impedances giving the amp significantly more weight and tone into 8 and 16 ohm loads.  

The Gizmo deals specifically with the ringing and shout of the lowther driver.

Steve

I don't want to feature Lowther in this conversation because the ringing and shout is typical of many (most) high efficiency near full-range drivers. This is because these types of drivers are high in efficiency and feature low-mass / paper-thin cones. The cone's break up at high SPL's AND let all of the sound inside the cabinet right back out through the cone. It is almost always the cabinet and rear wave that creates the "shout" so many complain of. The frequency balance of these types of drivers calls for large cabinets, usually horns, to have any real serious bass - enough to offset their naturally tipped up response.

Steve