Nelson and I spent a couple hours today comparing my Crown XLS-5000 amp vs. the Inuke DSP 3000 amp on his pair of Titanik MK3 sealed drivers. Our goal was to see if the Inuke DSP 3000 was limiting his pair of sealed 15" drivers in comparison to an amp that has all the power it could possibly need to push the Titanik MK3 drivers to the ragged edge.
It appears that the Inuke DSP 3000 is actually a very solid matchup to the Dayton drivers. We determined that when the Inuke got to the point of steady clipping on a naked, un-equed signal, that there was only about 1dB of headroom left on the table before the Titanik drivers themselves started compressing as tested when they had virtually unlimited power on the XLS5000.
The way we tested this was to begin charting the frequency response of Nelson's pair of subwoofers on the omnimic and continue to increase the volume until the subs FR stopped raising linearly. During these tests, the mains were always disconnected, and we were only listening to subs. The omnimic was placed in Nelson's main seating position. We never encountered compressing on the drivers when powered by the Inuke with no EQ applied. What we encountered as the limit was actually a steady clip light on the Inuke amp. This level of full clip while still raining linearly in frequency response is indicated by the black line in the graphic that follows. We switched over the Crown XLS-5000 and increased the volume until we hit the same general SPL based FR curve and recorded that which is the red line in the graphic that follows. On the Crown amp of course there was no clip light indicated, and plenty of power left in the tank. You'll note that FR's are basically in line between the two amps with the exception of a somewhat negligable difference between 50 and 60hz. I don't have an answer as to why this difference was encountered, but it is a small enough descrepancy not to be concerned with --- so it appear that to the point right before full clipping on the Inuke DSP 3000 amp you are getting a nominal output and similar frequency response to a full heavy duty battletank 5000 watt Crown amplifier.
Unfortunately, I didn't catch a graph of what happened next, when we decided to push the Crown. We turned the AVR volume up just a bit to see if the sub drivers had anything left when powered by the more capable Crown amp and the subs started making a bit of bad sound, almost immediately after raising the volume from this point. The clip lights never flashed on the mighty Crown amp all night, but you could tell the Titanik drivers were at this limit as the FR graphs stopped raising linearly when pushed harder by the Crown amp. Summary
- The INuke DSP 3000 is a good matchup to the Dayton pair, and you don't leave much, if anything, on the table by forgoing an upgrade to a more powerful amp.
Round 2 of testing. We began testing with the MIC2200 providing EQ. Using the analog dial we were stripping down spl at 65-70hz, and adding juice at maybe around 15hz - 20hz according to the mic2200 dial settings. This allowed a fairly flat EQ line down to about 17hz as you'll see in the blue line in the following chart. This graphed blue line was about the most we could get out of the drivers before compression or some sort of unwelcome, and non linear change to frequency response occurred. How did this 'compression' or non linear frequency response change reveal itself as we upped the volume? We'll oddly enough, it didn't seem to occur at the lower frequencies, but at the higher frequencies instead. Both amps started showing a null at around 65hz, when pushed about 5dB beyond what the last linear increase in SPL was recorded at. You can see in this instance that once again, the amps aren't at fault for the change in frequency response, but rather that drivers were hitting some sort of limit. As to why this occurred at 65hz instead of 10 or 15hz? I don't know. Perhaps someone can offer some insight.
Finally here is a graph with all five captures together