Originally Posted by Sekosche
So in light of recent posts regarding larger drivers in a BOSS, before building another platform to fit 6 drivers, I’m debating stepping up to a trio of 15” possibly Dayton Classics. These forums will be the death of me...
As you know, I was going to add three more JBL’s to my current 3 driver BOSS, and I already have them on hand. But it would save me a lot of time/effort building a completely new platform to stay with a 3 driver build and just step up to a little beefier and lower Fs driver and just enlarge the current holes.
Specifically looking at this driver: the Dayton Audio DCS385-4 15” for $84.95. https://www.parts-express.com/dayton...4-ohm--295-206
I did some rough comparisons without modeling, and seems like a pretty solid upgrade on paper. Compared to the 12” JBL, the Classic 15 has 66% more moving mass, a much lower Fs of 17.5Hz, but 22% less Xmax. My thoughts are that the lower resonant frequency combined with the much higher mass will more than offset the slightly lower Xmax, and should help add significantly more ULF TR below 25Hz where I’m looking to increase.
Thoughts on using this driver? Hard to say if it’d be a worthwhile upgrade for the money, but it would be a lot easier for me than rebuilding a riser. I’d love to jump to a more high performance driver with a significant increase in Mms, and at least comparable Xmax, but those typically double or triple in price. I have a spare 18” RSS460-HO I’m not using, but I’m not sure it’d fit.
Also, anybody know of any comparable 15” drivers, around $100, and efficient enough to run 3 in series off an iNuke 6K? The BOSS has opened a whole new can of DIY worms, because I honestly wish it was more difficult to dissuade me from tinkering.
Originally Posted by Rowan611
Now I’m wondering if I should pick one up to test. That JBL is nuts....but I think the 15 would do better with ULF.
Below are the numbers on paper for a Dayton DCS385-4 15" compared to the baseline $29 JBL.
The Dayton 15" has 53% more mass (273g vs. 179g) and 38% less Xmax (9.3mm vs. 15mm), so the shaker potential is 1.53 x .62 which equals ~.95 which is pretty close to the JBL.
However, the 15mm for the JBL is Xmech while the Dayton 9.3mm is Xmax. If the Dayton 15" has an Xmech of say 15mm, it's shaker potential would be 1.53 times more than the JBL, so it really depends how much safety factor is in the 9.3mm published Xmax for the Dayton.
Now, for the frequency response, here's where it gets a bit more interesting, the Dayton is in Red below and the JBL is Blue.
With the loose suspension of the Dayton 15", it only takes about 20 watts to reach Xmax while the JBL takes 80 watts.
The Dayton will use much less power than the JBL's, so if that means moving to a smaller amplifier, that could make up for the extra cost of the Dayton drivers pretty easily.
You can also see the Dayton is more sensitive in the lower frequencies and it starts to rolls off above 20Hz.
So I would say, it really depends on your goals....if you seek increased single digit response and think your 20-30 Hz is already too much, then the Dayton will likely be the better choice. You'll likely be able to tune that Dayton 20-30Hz response to your liking with DSP easier than you can tune the single digit stuff with the JBL's. The JBL's are no slouch with the singles though as many of you know, especially with a low shelf filter.
I think it really depends on your ULF TR goals and space constraints of your BOSS design.......how much room underneath your seats and how tall your riser will need to be, plus a bit more cost with the larger driver.
The above is all just theoretical, of course, so it would need to be tested, but wanted to share some of the technical comparisons if that helps.