Originally Posted by bkruse
Hey lilmike, again, thanks for responding guys, in my quest for LFE glory!
It's the amp clipping, and I can hear the subs make a weird noise when it clips. I do _not_ believe the drivers are overdriven. They are capable of much more, but with certain sounds, it will clip and overdrive (possible that the EP4k is pushing all that sub 10hz). I wouldn't mind crossing it over at 15hz, especially if I can push it harder.
I am going to get the minidsp - I am a techie, so the idea of all those
tweaks and being able to try other's success tweaks is just amazing.
I can definitely run REW back through a laptop/PC in real-time down in the basement for tuning.
I can get those 2x 21" drivers, and I can do some decently complicated DIY stuff, especially with some friends who are willing, but not sure where to even start in building a cabinet for that. I wish I could just use the DTS-10 platform, but with 21" drivers instead of 12
- any ideas here?
There's two parts to overdriving, thermal limits and excursion limits. It sounds like you're exploring the excursion limits. A highpass will help a lot. That's typically a good sign that you need more (or more capable) drivers to get the SPL you want. Bass takes displacement, and though they're burly, the 12s in the DTS-10 do have their limits.
Have a look at this
, which is arguably the most complicated tapped horn fold out there in the wild, and we're not done with it yet. It is certainly the most complicated fold I've drawn up. This uses a pair of 15s, and it is HUGE. It also puts a few dB on the DTS-10, as would be expected. Did I mention it is HUGE?
Most of the 21s I've modeled don't go as low as the DTS-10, but they do get louder. They're gonna be in the 25 to 30 cubic-foot range as far as cabinet volume, which is beyond cumbersome for a sub that does not go much below 20 Hz.
Personally, I like the idea of multiple smaller cabinets, cause I gotta move them. Since I'm getting older, 20 cubic feet is pushing things.....
Consider - a single 15" driver in an 18-cubic-foot cabinet models at 123 dB at 20 Hz 2pi using a $250 (street price) car stereo driver. A pair model at nearly 130 dB, 2pi. Four? Assuming you had enough power to drive them (and you do...) they should exceed 130 dB in a 2pi setting at a meter. In a room? Over 130 at the couch, easily. If this is not enough, seriously, seek professional help.
If you want to get below 20 Hz, the same drivers can dig a little deeper (-3dB at 14 Hz), but give up ~5 dB of output capacity and require 12 more cubic feet of cabinet volume. Nothing ever comes for free.