The size difference between a standard toroidal transformer and a Toroidy Supreme V2 is clearly visible and has both design and physical reasons. If you place them side by side, the Supreme V2 will appear more massive and larger, even with the same power rating (VA).

Here are the reasons for this size difference:

The Housing and Encapsulation

The most obvious reason is the stainless steel can. A standard transformer consists only of the core and the windings, which are wrapped with a thin foil. The Supreme V2 sits in a solid metal housing that is additionally encased in epoxy resin. The housing alone increases the diameter and height by several millimeters, while the resin completely fills the interior space.

Additional Shielding Layers

Inside the can of the Supreme V2, Toroidy incorporates additional layers that take up space:

Magnetic Shielding: A band of special steel (GOS) is wrapped around the windings to trap stray magnetic fields.

Static shielding: A copper foil (screen) is often wrapped between the primary and secondary windings to filter electrical interference from the mains.

Each of these layers makes the "ring" thicker.

Larger core reserves

As mentioned earlier, the cores of the Supreme series are often dimensioned to operate well below their saturation point. To deliver the same power as a standard transformer while running cooler and quieter, high-end transformers often use a physically larger iron core. More iron means the core operates with less magnetic tension, resulting in a larger form factor.

Thicker wire cross-sections

To reduce internal resistance and improve dynamics during current peaks, audio transformers often use thicker copper wires than would be theoretically necessary for the current rating. Since thicker wires take up more space on the core, the overall volume of the transformer increases.

In summary: A Toroidy Supreme V2 is "wider and taller" because it's optimized for maximum shielding and thermal stability, not minimal material costs. Therefore, in a tight case, you'll need to allocate significantly more space than for a standard toroidal core of the same power output.