July 27, 2006

Velodyne SMS-1

So I'd been using the Behringer FBQ2496 to equalize my subwoofers but just got a Velodyne SMS-1 mainly because I thought it would allow filters to be set as low as 5Hz. Turns out that's not the case. Filters can only be set down to 15Hz, which is still better than the 20Hz limit of the FBQ2496, but not as low as I'd have liked. But the measurement system and real-time feedback turned out to be an plus that really made the SMS-1 worth it.

The first thing that the SMS-1 allowed me to do was identify the ideal crossover point for my speakers. By adjusting the crossover point and then going back to the SPL graph, I was able to determine that my ideal crossover is at 60Hz. Lower or higher results in a bigger cut at the crossover. I did find the automatic EQ to be less than ideal, mostly because it doesn't bother to move off the standard 1/3 octave frequencies. Instead, I got the best results by manually setting parametric filters at the precise locations. Another benefit is I was able to match the subwoofer volume to the mains volume a lot better. The DMC-1's subwoofer calibration signal is a little messed up.

The 1/3 octave smoothing issue mentioned in the Audioholics review is an isssue. I would suggest verifying the response using Room EQ Wizard's signal generator to see if your filters have done anything undesired. But, if you try to make your filters have as high a Q value as possible, you can probably avoid that anyway.

Posted by josuah at July 27, 2006 6:50 AM UTC+00:00

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