Quote:
Originally Posted by nograveconcern 
Really? Have you measured? Have you considered the effect of the room on your sound?
I don't have data for the F12, but the higher end Acoustech branded sub is tuned to 30hz and puts out most of it's energy at 40hz rolling off quickly above and below. Not exactly the smooth, flat response that buyers of the pioneers are after.
The pioneers are not capable of high spl, but they will do 6-10db below reference in a room powered by a typical receiver. If you are curious, the formula is:
DB@1m1w + 10Log(Receiver Power in W) - 20Log(Distance in ft *.3048) -105 + 4
85.75 + 10Log(120)-20Log(12*.3048)-105+4 = -6
105 being db at THX ref and +4 being aprox gain from room vs anecholic.
87db @ 2.83V and 6ohm = 85.75db @ 1 W
90 w @ 8 ohm = 26.83V
26.83V @ 6 ohm = 119.9W

Really? Have you measured? Have you considered the effect of the room on your sound?
I don't have data for the F12, but the higher end Acoustech branded sub is tuned to 30hz and puts out most of it's energy at 40hz rolling off quickly above and below. Not exactly the smooth, flat response that buyers of the pioneers are after.
The pioneers are not capable of high spl, but they will do 6-10db below reference in a room powered by a typical receiver. If you are curious, the formula is:
DB@1m1w + 10Log(Receiver Power in W) - 20Log(Distance in ft *.3048) -105 + 4
85.75 + 10Log(120)-20Log(12*.3048)-105+4 = -6
105 being db at THX ref and +4 being aprox gain from room vs anecholic.
87db @ 2.83V and 6ohm = 85.75db @ 1 W
90 w @ 8 ohm = 26.83V
26.83V @ 6 ohm = 119.9W
I happen to agree with you on the idea of a single 12" sub being nowhere near enough to keep up with these speakers if you're after full range sound. But I don't think it's reasonable to assume that most looking at these speakers are going to target full range sound. Most are going to be happy with rolling off in the 35-40Hz range. Not because they want to, but because that's when they're going to hit the limits on the budget and/or time they're willing to put in on a subwoofer. It just comes with the price point. People that are serious enough about good sound to chase flat response down to 20Hz and lower aren't often looking at speakers in this price range. You (and I) are an exception.
Now on SPL. 6-10dB below reference on receiver power with these speakers sounds like a BIG stretch to me. Maybe that's possible at very close listening distances, but not at the 12ft you use in your calc. My seating distance is less than that, and the speakers create obvious distortion at -10dB on receiver power. I can get to -10dB pretty comfortably on external power, but definitely not -6dB.




























