Originally Posted by MTBDOC
How did you decide how much power to use in the measurements last night? If I am following the discussion, the different impedance produces different excursion levels, so there is risk in destroying the driver getting the most juice. So is it the total limit on power input (due to the variable load presented by each driver) the primary problem, and if so, how does one assess individual driver excursion? Simply, is there any way to assess how much output would be lost by running these as a single 4ohm load?
This issue has been quite interesting as I have tried to follow what Ricci has shared... things I had never pondered! I enjoy the intellectual stimulation as well as the practical enjoyment of these toys
And PLEASE, clarify if/when I am missing the boat. Horn subs = new ground for me!
For close-mic measurements, its really irrelevant. I just turned it up until it was 10db under clipping the mic.
Close-mic takes so little power that its not possible to damage the drivers.
Now when I actually turned it up and demo’d it, there was full possibility of driver damage. I just slowly increased the level while listening for evidence of bottoming out.
This is in no way foolproof, but the BOSS crew has proven these drivers generally survive bottoming out. I decided to take the risk, and didn’t get burned THIS time.
My understanding is not that the drivers are taking additional power, but are exhibiting extra excursion due to the acoustic loading of the horn path. I could be completely off here, this is for
I have detected no coil-smell. My fear is mechanical damage, not thermal.
The amp I’m using has no indication of power level. I’ll try to figure out voltage measurements during the ground-plane sweeps. I am worried about destroying the drivers during that process. And more so in the theater on 2500w.
Don’t get me wrong, I’m not trying to damage the drivers. I would greatly prefer them to survive. But the whole point of this experiment is to determine how this setup performs and if its worth building. I can’t claim to have proven anything without pushing it to the limits.
Horn subs are new ground for many people.
Multi driver horns are new for almost everyone. Tom Danley and Josh Ricci are the only two people I’m aware of that have significant real-world experience with these. This is why I’m grateful Josh is helping out with models and explanations on this one.