On Mar 14, 10:03 pm, wrote:
Surge protectors can help because they provide insurance coverage for
surge-induced damage, ...

The 'insurance' is so full of exemptions as to be useless. One
example:
Eligibility for coverage under the Equipment Protection Policy:
3. The APC product must be plugged into properly wired and
grounded outlets; no extension cords, adapters, other
ground wires, or electrical connections may be used. ....
The installation must not include power protection products
made by any manufacturer other than APC.

Even a ground wire to reduce amplifier hum volds the insurance. Even
an extension cord voids the insurance?

Take a $3 power strip. Add some $0.10 parts. Sell it for $25 or
$150 dollars. Hype some insurance claims with fine print exemptions.
They are not selling a soluton. Monster, APC, and Tripplite are
promoting obscene profits - will even hype a big buck insurance that
does not get honored. Responsible manufacturers instead sell a 'whole
house' protector. Other sources such as www.cor.com or Brickwall
provide solutions for power conditioning. However, those www.cor.com
equivalent products should already be inside a power supply.