| Round wire | Flat wire |
 |  |
| Bobbin is necessary | Bobbin is not necessary |
| Cut Shape is round, so there are space between winding | Cut Shape is rectangular, so improved space factor |
| Multi-layer winding keeps heat inside | Single layer winding to improve heat ventilation |
Rectangular Shaped Edgewise Wire make
coils smaller and more efficient, and also save cost.
| Round wire | Flat wire |
 |  |
| There are many turning over and inductance is getting larger | There is no wiring turn over, so floating inductance is smaller |
| By small impedance, it cause improvement of frequency response |
 |
