The primus is 93db and goes upto 200W Pioneer is rated 97db and goes upto 130W Difference is 6db. So does this mean that if both are powered by the same AMP at 90W the Primus will sound 4 times as loud as the Pioneer?

Soory i mean Pioneer is 87 so there is a 6db difference. So will the primus really sound 6 times louder at the same power input level?

We actually like to phrase it more as the Pio will require 4 times more power. Remember 3db is twice.

Check this out: http://www.audioholics.com/tower-speaker-reviews/primus-p363/primus-p363-measurements So these and the pioneers are the same except the primus can handle more power.. but i will haave to look at a 4ohm amp

That's fine but aren't these as loud as the pioneer because of the low impedance and resulting lower sensetivity

What Audioholics is leaving out(cause it is a steep learning curve)... Ohm load is not a constant. I wish all speaker manufactures would move to sensitivity at 2.83 volts(cause then, ohm load doesn't matter...provided voltage is all you care about. Then the wattage consumed is the other side of the equation of volt/ohm). Since a speakers frequency response and ohm load never "mesh"...your point about "reality being 87db if this were an actual 8ohm speaker"(as Audioholics "correctly" says) is a completely bogus assumption.

Audioholics isn't running 100 watts into the speaker. Not all amps double power at 4 ohm. So...if you have an amp capable of 100 watts at 8ohm, and 130 at 4 ohm...then the difference of 92 at 8 ohm or 89 at 4 ohm is a moot point. If you were hooking this speaker up to an amp that could actually deliver 100 at 8 and 200 at 4...then it matters. Are you buying an amp capable of that? No.

Here is the 727... http://us.onkyo.com/Products/model.php?m=TX-NR727&class=Receiver&source=prodClass Dynamic(which is not RMS) power at 8 ohm is 130w. Dynamic at 4 is 220...but one channel only. Then it gives a 3ohm rating of 250 on two channels. So, no. The 727 does not double power at 4 ohm. But it won't have a problem.

So with the 727 will there be a difference in loudness between the pioneer and primusHow much difference

Also, if you notice it chews 6.9 amps. 6.9 x 120 = 828 subtract out the 80 the video uses...748. divide that by 2(amp loss)...374. 374 /5 is 55 per channel.

Can you recommend a more powerful amp in the same price rangeI owe you a gift card after this is over

You have 55 watts per channel be it 1 ohm or 16. The AVR itself provides a voltage which your speakers reply with an ohm load to come up with watts. The "watts" (which results in how fast out of the AVR the voltage flows...hence the faster it flows, lower ohm, the more power is drawn off the provided voltage) is 55 regardless.

Onkyo's at every price pull more power than everyone else. Yamaha does not list it. Pioneer/Elite use class D which is 70% efficient, instead of the presumed 50% of everyone else. But yeah, how much power an AVR sucks off the wall is about the only indicator of real power. Obviously a low end Sony that says 100x7 and pulls 300 watts off the wall...the math doesn't add up.