Originally Posted by N8DOGG
lol Mark, speculation is the best part of this hobby! hahaha Although it is a JTR thread, Danley and Seaton do get discussed quite a bit since they are all the kinds of designs we all like, so they will always be compared.
is there a name for the new sub? any other details? Are the the UM18's? or are they spec'd to your new design?
Output should be pretty darn good, guessing 1.5 times of a Cap or so if they are UM18's..... that is unless you tell us otherwise
The UM18 is a very well behaved driver based on the testing we've had time to do thus far in this and a few other test boxes. dlbeck popped in while we were testing these drivers in the never produced Terraform XL cabinets. These work very well at a great value in this very low tuned cabinet. I know many want to just look at say "oh, a big slot ported cabinet..." but if you think you can build and finish these precision cut cabinets with designed bracing using 3" radius corners at both ends of the port and for the internal bend for $400 each, I'll order 24 now
Many have seen this picture from more than 4 years ago of the design we never released:
This image shows 2 slightly shorter and wider units I had also built up:
Since the parts that will work best in my bandpass design need greater internal spacing, I looked for an 18" to suitably drive the cabinet of which I have 8 similar units on hand. The UM18 is quieter in operation (noise from motion), a good deal of linear/mechanical travel, has less of an inductive peak/roll-off, and is lower distortion than many other available options, while finally being readily available at an attractive price. Yes, I prefer to make further optimizations for specific product design that I'll be producing for many years, but this is a different situation and this allows using a driver that I suspect will be available for quite a while.
You were right that if I produced/stocked this design building new cabinets, using our 4kW DSP optimized amp and accounting for the logistics involved with such a large, heavy product, it would sell for around $4k depending on cabinet costs and cosmetics. Consider the pair of UM18s make up about $800 of that. I need the space back in my warehouse these 8 behemoths are taking up, so they will sell for about 75% of that. How many ported subs can you purchase and have delivered in 1 week that are tuned to 11Hz? Here are some better lit pictures showing what it looks like, although the grill will be replaced by a 1.5" thick vs. the 3/4" thick frame shown.