Understanding Motors & Drivers

In this section, it is going to be assumed that you have some experience in DIY audio. This includes understanding Thiele & Small parameters, along with how to use them.

Step 1) Magnet Motors are broken up into 3 segments

Entry Motors:

Entry produces BL outputs of 0.6Tm to 1.4Tm @ 3.2 Ohm. This means flux densities of 0.15T to 0.33T and Qts values anywhere from around 1.2 all the way up to 2.5. This lends these motors to be in aperiodic designs or open baffles.

The speakers produced with entry motors will typically be between 70<78dB @1W/1M and power handling of 3W per driver. Xmax values vary on motor from 1.5mm one way to 3.0mm one way.

Mainstream Motors:

Mainstream produces BL outputs of 1.7Tm to 2.5Tm @ 3.2 Ohm. This means flux densities of 0.40T to 0.60T and Qts values anything from 0.6 to 1.2. This lends these motors, depending on driver size and Mms to work in sealed, ported, aperiodic, transmission line and passive radiator designs.

The speakers produced with mainstream motors will typically be between 80 < 86dB @1W/1M and power handling of 5<10W per driver, depending on filament used and compliance. Xmax values vary from 2.0mm one way to 3.5mm one way.

High End Motors

High end motors are still be finalised, but are targtting BL output of 3.5Tm to 4.5Tm @ 3.2 Ohm. They will be designed to be altered so your Xmax and BL output can vary to match your needs. Flux density is between 0.65T to 0.85T, and Qts values will be anywhere from 0.3 to 1.0, depending on the size of driver. This will mean designs could work for sealed, ported, aperiodic, passive raditor, transmission lines, open baffle and horns.

The speakers produced with high end motors will typically be between 82<90dB @1W/1M and power handling of 5<40W per driver, depending on filament used and compliance. Xmax values vary from 3.0mm one way to 8.0mm one way.

Step 2) Target Cabinet sizes

The different motor ranges have been thought through with target sizes as well. Below is a rough guide for the plans of each segment:

Step 3) Matching driver choice to motor

When I am testing and producing each driver, I will publish data with the motor I believe to be best suited to that driver. I will however have the expected BL output on the magnet motor pages.

This means you can alter Qes to match the BL of another motor and see if it works for your plans.

Polymate3D is creating various driver series to match specific criteria, so feel free to click the link below to get a understanding on what each driver series is about

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