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Basic question about impedance and watts

I just bought a pair of Thiel cs3.5's and am now looking for an amp. If the impedance is 4Ohms (i think this is the correct value, i didn't get the owners manual) and the recommended power is 50-150 watts (once again, a guess), how much power should the amp have? Do i need an amp that is 50-150 watts at 8ohms, or do i need an amp that is 25-75 watts at 8Ohms (assuming the amps watts double as the impedance halves)?
I guess the reason i had no luck searching for this is because its so basic.
if anyone knows the specs for these speakers, could you let me know? the owners manuals are available on Thiel's website for most, if not all, models except the 3.5s.
ketchup

Showing 2 responses by elevick

elevick
2,638 posts
 
1-you should get as much wattage as you can afford. Thiels will suck your amp dry. Don't get me wrong, I love thiels. However, anyone buying that level of speaker must match it with an equal amp.
2-a little help with wattage:
Doubling the power will get you a 3db gain
Every 10db will double the perceived listening volume
Therefore, a 94db speaker, 8ohms, will produce about 110db at 50watts. An 87db speaker will require about 150 watts to get the same volume.
elevick
2,638 posts
 
I've found Aragon's customer service to be as good as Thiel's. Also, the laid back sound should take the "bite" off of the thiels nicely.
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