Is it too costly? Very likely. It's not just the cost of making the the coils quieter, you also have to put them through Quality Control procedures. That's wh

Is it too costly? Very likely. It's not just the cost of making the the coils quieter, you also have to put them through Quality Control procedures. That's where the expense is. Then there is also the old adage: "If it works, don't fix it." Coil whine is merely the modern equivalent of transformer noise.