Originally Posted by JapanDave
Wow, I had no idea that 250W would be able to put out that much db on those speakers. And 114 db at the back of your room will probably make your ears bleed anyway!
So it would be safe to say 250W of power will bring these speakers into ideal performance range?(sound quality speaking of corse)
I think that it would be safe to say that 250 watts will bring these speakers in to ideal performance range. In fact you would probably never need all 250 watts, but it having amplifiers capable of 250 watts gives you some headroom so that the amplifier is never driven to clipping range.
I decided to run the numbers for the JBL speakers:
With a 250 watt amplifier (by the way an amplifier that will put out 250 watts into the 8 ohm JBLs will put around 350-375 watts into the 4 ohm JTR's, For example my amplifiers that put out 150 watts into my 8 ohm speakers will put out 235 watts into my Triple 8's when they arrive)
115 db at 1 meter, 109 db at 2 meters, 105.4 db at 3 meters, 102.9 db at 4 meters and 101 db at 5 meters.
That is probably perfectly adequate for most people, as most people do not watch movies at reference level, but it does not leave you any headroom.
The JTR Triple 12's would add 2 db to all the numbers I posted above for the Triple 8's.
Like you said above, none of this output data really matters unless the sound quality is good at this high output.
As far as I know, the sound quality of all 3 of your choices should be excellent. The Mark Seaton designs are supposed to be incredible. However, if the JTR Triple 8's are anywhere near as good as the reviews say they are you will probably never need to upgrade. As posted above, you reach a point of diminishing returns where doubling or tripling the amount of money you spend will only give you a 10% improvement. (I don't know anything about the sound quality first hand as I am still waiting for mine to arrive)
You will probably not be unhappy with any of the choices on your list, but my vote would be for either the JTR's or the Seaton speakers over the JBL's in this case. There are other JBL speakers with performance characteristics in the same range as the JTR's or Seatons, but you will probably still get more for your money by using one of the internet direct companies than JBL (Not that there is anything wrong with JBL as a company)