Originally Posted by Ricci
I ran 2 sampled kick drums and a bass drop like effect through the DTS10 strapped to a bridged CE4000 providing probably 2000w, 2 sealed 18" xxx's powered by a PL9.0 providing probably 3000w to each drive and also a Velodyne CT150 (ported 15", 300w rated) to stand in as a decent strength commercial sub. I increased the level of the Klipsch CF4 mains to about as loud as I thought feasible and left it there for all of the subs. Then using the SW level control I increased the output of the subs until each was either showing signs of distress or amp clipping was indicated with each sample and recorded the output of the sub with my ecm8000 into Spectrum Lab. I also used a Galaxy CM140 set to C weighting, fast response, 80-130db range, set at the listening position to record the max SPL with each sub on each sample. I figured that this would give me a sense of how dynamic each sub system could be when called upon in short bursts. I ran the subs both with and without the mains and recorded the results.
First thing of note is that the set-ups aren't exactly the same, as the subs are in as close to the same but still slightly different positions and subject to the room acoustics, so just take this as a sort of rough estimate of the dynamic capabilities of each influenced by the room. An 80hz xover was used. Also I don't think that the SPL meter is capturing the peak levels of these short events accurately. It seems to be really low compared to what I experienced. Tom commented about this a couple of times before, about instantaneous clipping going unnoticed and the inability of measurements to pick up the event fully. Makes one wonder.
The second sample in each waterfall is with the level reduced 5db.
Here's the first kick drum electrical.Velodyne CT150 plus mains max output kick 1
112.2db. Clean but not as thick sounding as the other subs. Compressed.Dual XXX plus mains max output kick 1
113.8db. Clean, seemed louder than registered on the meter, good attack. Ran out of amp.DTS10 plus mains max output kick 1
116.8db. Clean, loud, huge attack, seemed much louder than the meter registered.Velodyne CT150 alone max output kick 1
100.7db. Much weaker without the mains, compressed and not as deep or clean sounding.Dual XXX alone max output kick 1
110.5db. Very clean, loud, ran out of amp. Seemed louder than indicated.DTS10 alone max output kick 1
113db. Clean, very loud. Seemed louder than indicated.Kick drum #2 electrical.Velodyne CT150 with mains kick #2 max output
108.9db. Fairly clean, not as deep, seems compressed.Dual XXX with mains kick #2 max output
113.8db. Loud, clean, good attack, seemed louder than measured, ran out of amp.DTS10 with mains kick #2 max output
117.4db. Very loud, seemed fairly clean still, massive attack.Velodyne CT150 alone kick #2 max output
104.4db. Weaker without the mains, less extended sounding, compressed.Dual XXX alone kick #2 max output
110db. Clean, ran out of amp, louder subjectively than the meter indicates.DTS10 alone kick #2 max output
113.8db. Very loud, seems clean and much louder than indicated by the meter.Bass drop electricalVelodyne CT150 bass drop with mains max output
109.1db. Very compressed lows, overdriven sounding.Dual XXX bass drop with mains max output
113.2db. Very clean, loud, big room shake, ran out of amp, seemed louder.DTS10 bass drop with mains max output
115db. Very loud, seemed louder, nice room shake. Thought I detected a hint of an over driven quality to the bass.Velodyne CT150 bass drop alone max output
100.8db. Again much weaker without the mains. Squashed low end, sounded over driven, limited. Not much room shake. Mains outgun this sub.Dual XXX bass drop alone max output
110.2db. Clean sounding output. Big room shake. Amp limited. Seemed louder.DTS10 bass drop alone max output
110.7db. Loud, seemed louder than measured, good room shake, I think that the drivers were beginning to reach their excursion limits on this test. Sounded like there was some doubling going on without any masking content from other speakers. Right below amp clipping. Turning it down a few notches removed this aspect. Output did not seem to be compressing however.
As you can see the DTS-10 has a massive amount of bass output particularily above 40hz. It is very efficient. Seems to be about 8 or 9db more efficient than this particular pair of sealed 18's, which are admittedly innefficient above 30hz. Allowing it to produce higher levels on regular old rock music than the pair of 18's with 4.5db more power available to them. Granted I don't really need the last few db of either set-up except at the low end extreme. The dual 18's do have the headroom advantage below 30hz I believe, but the DTS-10 is still very impressive in that regard. Further testing in that area will come later. I'd really like to redo these tests outdoors at a later date to remove the effects of the room.