Systems ListDanley Sound LabsDTS-10 LMS-R

Measurement Details

AmplifierPowersoft Digam K10
Outside Temperature80 F
Date TestedAug 12, 2011
Tuning Freq. Of Test14.5 Hz
Settings & Equalization
  • 12.5Hz 4th order Butterworth high pass filter


Overall the system matched the simulation data but not quite as well as hoped probably due to some complex changes that were not able to be added into the model.

The LMS-R driver swap dropped the sensitivity of the system a little more than expected above 30hz compared to the factory configuration, but overall it is still respectable in this regard especially considering the effective lower limit of this system. The impedance minimum measured with the drivers wired in series was 10.58ohms at 14.4Hz. An input voltage of roughly 3.25v was used for the sensitivity tests. The native response shape is rougher than factory, which is not all that smooth to begin with so some equalization will likely be needed as with most any system. The response does smooth out at high drive levels due to compression effects and the long term system compression is not too shabby either. A horn such as this exerts a lot of control on the cone excursion from the drivers which is good but it also limits the cooling of the motors since they are not pumping as much air through the gap --a double edged sword.

This system's response is not useable past 100hz due to a very large and deep null present there. Also this system should be used with a steep high pass somewhere in the 12 to 15Hz range as the drivers unload very quickly below that point. Overall the system exhibits slightly lower distortion for similar output levels than factory but still exhibits the same trends in the overall profile due to the enclosure design. There are some interesting differences in the distortion profiles at the low end as compared with the factory DTS-10 though. The THD% profile still follows the horn resonances by boosting the harmonics that fall near them. Unfortunately the boost provided by the horn will also amplify any distortion harmonics that happen to fall in that range.

For example at 27Hz this system is much more sensitive at 54Hz and 81Hz than at 27Hz so the H2 and H3 harmonics of 27Hz are greatly boosted by the horn properties itself. It seems a mixed bag in this regard where some frequency bands are indeed very clean, and others have higher than usual THD. This system did have very strong capabilities overall, especially between 12.5-31.5Hz and showed less compression below 30Hz than factory to go along with the greater peak output. Some wind, or air flow type noises were noted at the most extreme output levels. There was also some noise from flexing of the metal grill at the highest output levels.

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