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Velodyne SMS-1 curious observation


Bob_Collins

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Has anyone else noticed that when running a self-EQ (sub only) on your subwoofer it doesn't roll off the low end and it plays louder than when you run an auto-EQ or manual-EQ?

Is the flatter low-end response simply the result of the volume appearing to be louder, or is this the result of some subsonic filter in the receiver (Marantz SR8200) cutting off the very low end of the subwoofer output?

Note, the volume setting on the subwoofer was not touched, nor was the volume changed on the SMS-1 (it was kept at a value of 15 for all modes (self-EQ, Auto-EQ, and manual-EQ)), however the output registered higher on the display output from the SMS-1 when running the self-EQ, and as I noted above, the output was not rolled off but rather was pretty flat across the entire low-end spectrum that the SMS-1 displays on the screen (down to 15 Hz.).

Any ideas as to why this might occur? Is the SMS-1 outputting a louder signal (even though the volume setting is the same) when it runs a self-EQ versus going through the receiver when doing it via auto-EQ or manual-EQ, and is this louder signal the reason why the very bottom end does not drop off?

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