http://support.klipschgroupinc.com/kb/faq.php?id=69
Under "amplification" står det.
Admittedly, receiver specifications are littered with lots of numbers and acronyms. Luckily, there is a general “rule of thumb” for choosing the proper wattage for your speakers.
Klipsch lists the RMS rating for all of its speakers. You can find it on the specs page under “Power Handling.” The industry standard is that you should use an amplifier that is anywhere between the RMS value and twice the RMS rating.
If you can’t find an amplifier with that exact rating, multiply the RMS power rating by 0.8 to find the lowest range of acceptable power.
Example: Klipsch Reference R-28F Floorstanding Speaker
RMS Rating: 150 watts Continuous / 600 watts Peak
Minimum (per Rule of Thumb): .8 x 150 = 120 watts.
Maximum (per Rule of Thumb): 2 x 150 = 300 watts
Acceptable Range: 120 watts – 300 watts
Anything larger is potentially excessive power. Anything smaller could cause damage from the amplifier clipping and digital distortion. Hint: that’s not good.
If you start to hear distortion from your Klipsch speakers, you need to turn down the volume immediately, as you could cause irreparable damage to your speakers.
Men dom förklarar inte tumregeln... Så, vad menar Klipsch egentligen