The 3015lf, the 4015LF, and the 6 ohm Lab 15 all have identical voltage displacement limits, and the same volume.
Is that true? What about Xmax, Sd, and efficiency? Couldn't a driver have higher values of those, yet have a lower voltage limit on the vc? Or with higher values of all those, would manufacturers use a higher voltage coil?
Rich, there is a descending order of importance in factors/TS parameters, when assessing and calculating driver use/voltage displacement limits, in horn loaded cabs
. The top 2 are Xmax and impedance. I'm not sure of the rest of the TS specs, and their descending order of importance, but Bill has said the top 2 are the most significant more than once.
BTW, the 3015lf has higher Xmax and Sd than the 4015lf, both have less than the lab15, but the lab15 is a 6 ohm nominal driver (8 ohm nominal for the other 2).
Start throwing in other variances in TS parameters, reducers for the lab 15 if used, and the three end up having the same voltage displacement limits, as listed in the plans, so output is the same.
This remains true despite the wildly differing power handling capabilities of each driver as well, because those stats are obtained in an infinite baffle, and not a horn. So it's not uncommon for a lot of drivers to reach Xmax and the drivers thermal limit at the same time in horn cabs.
Here's hoping I've got that right, but if I haven't, I'll learn something new today.
I remember differing phase response between different (similar) drivers being mentioned as an issue. (specifically between the Eminence and Dayton drivers in an SLA pro) Is this an issue in a sub? Or are the waves long enough that minor differences aren't important?
Interesting. Phase response is dictated by the cab. While it's often enough said don't mix different types of cabs because of differing phase response (eg T39's and T48's) and the consequent induced frequency cancellations, I've not seen it said "don't use different drivers and mix them with other cabs" of the same design...
2 x DR 250 (melded array) with March 2012 plans.
4 x 20" BP102 T39's, 2 x 28" 3012lf loaded underway.
3 x WH8 with melded array.Bunter's Audio and Lighting
"like"s would be most appreciated...