Originally Posted by Cagayan kid
Thats interesting to know. Would the sensitivity then translate into more feeling and tonal qualities in the drivers sound? Another question, below 30hz it would take 2 or more sealed to equal output of one ported right? Does that put the F25 in the position of being 2 subs, even though its one enclosure?
I would say it generally takes 2-3 sealed to equal the output of an equivalent ported sub around tune. This can be seen in Rythmik's own lineup where the FV15HP has 2 dB more output than the dual 15" F25(at 20 Hz). So it would take a third sealed sub to be 1dB higher than the single ported 15". As far as tactile effect goes, the ported sub will have more TR(tactile response) than sealed subs even at the same SPL. It might take double the output(+6 dB) or more from sealed to line up in the TR department. This only applies down low around port tune.
In fact, I know of a forum member who went from a pair of ported JTR 18" subs(cap1400 or 2400) to 8 sealed 18's. He said it takes all 8 to come close to the TR of the pair of ported subs.
Now up in the mid an upper bass, I believe the higher sensitivity drivers do have more impact and slam than a less efficient driver even at the same volume. I won't SWEAR on this, as it could just be that the low efficiency drivers are just not capable of producing transients as accurately as a more efficient driver. But, in my experience, I went from a sub that, on paper, can produce as much SPL in the mid and upper bass as I could ever use, but switching it out to a very high efficiency pro audio driver made an extremely drastic difference in the slam that I get from music. There is just no comparison. Is the SPL exactly the same? Is the pro audio driver producing much higher, uncompressed SPL during peaks and transients compared to the lower efficiency driver? Maybe. Im not sure. I suspect it could be some of both?
Ok so this was along winded answer that went off on some tangents. Does a higher sensitivity driver translate into more feeling and different tonal quality compared to a low efficiency, deep bass focused driver, especially in regards to music in chest slam? My answer is, I think so. Perhaps
can chime in with his more informed opinion on the matter.
Part of me thinks that, although maybe we THINK that a low efficiency type driver is providing all the SPL and more that we could ever use in the mid and upper bass without distorting, compressing, etc, but perhaps it is actually squashing dynamics with an inability to accurately reproduce peaks and transients. Whereas a more efficient driver has the headroom to play these peaks accurately. The question is, if both drivers can truly play at the same SPL without compression or distortion, will the sound be different with the more efficient driver?
In my personal experience, I had two low bass style drivers that, combined, could produce in excess of 115 dB up to my 120Hz crossover. I switched one driver out to a 99dB sensitive pro audio driver, and the added slam and impact on music was drastic. I wish I had more rigorously tested things such as the frequency response between the two setups particularly in the upper regions.