An idea to increase magnet strength in a speaker driver

[bumpy]

Its now relatively cheap to buy small neodymium magnets.

Equally, speaker driver manufacturers have magnet strength as one of the mayor selling points.
In addition vintage drivers will have gradually lost strength since first being built.

So my idea is to stack these small magnets on the rear of the driver magnets to boost their strength. Stronger magnetic field in the coil gap equals better control, drawing parallels with field coil drivers that do just this.

This idea was triggered for me by finding the magnetic front door sensor on my house alarm was giving occasional false alarms after 20 years. Two small neodymium magnets attached to the back of the existing magnet cured the problem.

Thoughts?