Originally Posted by Electrodynamic
You're assuming a lot and all of your assumptions are wrong. The first and most important erroneous assumptions are highlighted in bold. Almost nothing is shared between our HT line and this woofer. Well, the speaker terminals are the same. That's it.
The voice coil on this woofer is a 71mm ww eight layer flat wire wound on a 76.7mm ID stainless steel former. The motor is a 220mm OD 75mm stack with a 30mm top plate. Far from the motor that we designed for our HT line. This 24" also uses a 257mm OD spider pack. You're assuming that Xmax is the same as our HT line where this 24" woofer has an Xmax of 35mm.
Let me first thank you for the reply. This is part of what i was getting at. The other that when you leave too many things open and not explained people will make plenty of assumptions. As I mentioned previously I felt confident that most of mine were incorrect; I was simply basing them on the information that you had previously provided. In the future it may be beneficial to lead in with a little more detail to prevent others from doing as I did. Your company makes great product. It has done this in the past and I'm sure future products under the same ownership/ design team will be as well.
Now to your specs; OK you went from a 2.5 inch voice coil to a 2.8. Still somewhat underwhelming for the size driver being discussed. The motor seems moderate with what I believe would be an excellent top plate. The top plate thickness somewhat making up for other aspects of the motor structures moderate components. You didn't give a figure for BL by the way, is it available? The Xmax seems decent and I did truly expect some improvement here over the 18, so it is nice to see a significant jump here. Still not an overwhelming figure her though, given the driver being discussed. A spec for Fs would also be nice if available.
Now to the final point I was assuming; comparison of relative value between this driver and the SI 18. This is currently being based solely on displacement as Fs and BL have yet to be provided. Given the Xmax given for each driver (here I must assume the 35mm spec you give for the 24 is one way as you did not specify) This gives the 24 inch driver a total displacement of 909.5 cubic inches and the 18 a total of 323.6 for a single driver. This absolutely shows i was incorrect when comparing 2 18's to one of the 24's and shows that it would take 3 of the 18's to best the single 24 in displacement. Still somewhat cheaper than the price speculated for the 24 but more understandable given the higher cost of parts for the 24 as described before considering supply and demand. But still giving the edge to multiple 18's due to cost and the aforementioned diminishing returns on comparable investment.
Once again I am not trying to knock Stereo Integrity. they make great product and make it comparably affordable. When it comes to bass there are no substitutes for cubic inches and engine strength. I also realize that engine strength and power can sometimes be limited to other factors like cone strength, Xmax, etc. I learned this the hard way many years ago using the original Cerwin-Vega Strokers in our comp. car. A '72 Caddilac hearse with 6 18's. Those drivers had a hell of a motor, so much so that the drivers didn't fail but we ended up folding the cones around the inside lip of the surround attachment point because the motor was so much stronger than the cone. It was fun figuring out how to reinforce them before the next event. Once resolved it wasn't too long before 176db+ was a regular occurrence at IASCA and SLAP events.