MrMagic wrote:hmm...well I'm really excited about these. Because I've been waiting for something to buy from you for awhile. To bad it came in a tight budget squeeze,lol But i'm working my way around.
As you know...I had that 18" BL i purched from fi a ways back in a haste for the SPL comp. Question is though...i'm looking to replace it with 2 15's from ya and these just happened to pop up. Questions about the pluses and minuses. Lemme give you the details and maybe you can give me some comparisons.
Set-up: 1200 watts @ 1 or 2 ohms, 5 cu ft to play with, honda accord trunked.
Currently:
18" BL in a 5 cu ft box tuned to 34Hz Firing upward. Sub up, ports back
This new set-up:
be 2 15's at 1200 watts in a 5 cu ft box tuned to ----Hz? rear firing with ports most likely back also.
What do you think?? I'm not sure what your experience is with the Fi Line-up
I don't have any direct experience with the Fi woofers. Looking at the Sd and Xmax you would move about 5L of air with the single 18" BL woofer. With the pair of these 15's you would move 7.1L at the 23mm Xmax. How loud you can play in a sealed box is directly related to how much air you move.
The formula is as follows in half space: SPL = 20 * Log (Vd * F^2) + 48.6
So say we pick 40hz and compare the two:
SPL = 20 * log(7.1 * 40^2) + 48.6 = 129.7dB for the pair of C15.1's
SPL= 20 * log (5 * 40^2)+48.6 = 126.66dB for the single 18"
This is of course only half space with no cabin gain included. Simply to compare the output of the two drivers directly. You can plug in any given frequency you wish to compare the two. This is also for a sealed enclosure only. As you get to a vented enclosure you have to take into account the air displaced by the port as well which gets more complicated. However, the driver capable of moving more air will also be more capable of exciting the port resonance in most cases, and the difference in overall output becomes larger between the two.
Again I don't have direct experience with the Fi woofer, but this is an objective comparison between the two, much like comparing the horsepower between two engines. Your vented box volume and power looks very acceptable for the pair of 15's also.
John