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Velodyne DLS-5000R 15" Subwoofer with Built-In Digital EQ

Part II

September, 2005

John E. Johnson, Jr.

 

On the Bench

Distortion measurements were taken with the microphone 15" from the center of the driver. Room response measurements were taken at 2 meters, and MLS measurements were taken at 15".

At 20 Hz, which is below the tuning point, THD+N was 20% at 100 dB.

At 25 Hz, THD+N was still high.

At 31.5 Hz, THD+N was now quite low, at 2%.

At 40 Hz, distortion was a bit higher than at 31.5 Hz.

Distortion remained about the same at 50 Hz, and was low.

Using 40 Hz and 50 Hz sine waves, testing for IMD, the A+B peak at 90 Hz was at 64 dB, compared to the fundamentals at 96 and 98 dB. The B-A peak, at 10 Hz, was at 78 dB.

Shown below is the room response, taken at 2 meters, for the various EQ modes. The volume setting remained the same for all four, and the phase was set to 00. You can see that the response changes quite a bit below 70 Hz, depending on the mode. The Jazz/Classical mode appears to be the flattest, from 20 Hz to 70 Hz, and is the one I preferred for all types of music.

The quasi-anechoic response is shown below. It is pretty much a straight line roll-off below 70 Hz.

Conclusions

I have never been surprised at the high quality of Velodyne subwoofers, because I have listened to so many. What does surprise me here, is that the performance is so good at $799 street price. Even without the digital EQ, this is still a great subwoofer, but with the digital EQ modes, it is also a lot of fun.


- John E. Johnson, Jr. -

Copyright 2005 Secrets of Home Theater & High Fidelity

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