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Velodyne DD18 Owners - Tips and Guidance?

I recently acquired a Velodyne DD18 in perfect condition and I wanted to see if I could get input from fellow owners on how to get the most out of the subwoofer.

Should I take advantage of the low-pass filter? I'm currently doing that, sending just 80hz+ to my speakers (Audio Physic Avanti III) and letting the subwoofer handle the rest. However, I'm wondering if I'm losing any detail or quality by adding that step. Do others use this approach?

Placement: I find I have to place the sub far awayfrom my turntable because at high volumes I seem to get a lound shuddering effect, likely because the sound pressure or vibrations are somehow jiving with some natural frequency in the tt setup. Playing digital there is no problem.

I have the sub setup behind my speakes, about 6 inches from the front wall placed on a Sistrum 101 stand.

I have the volume at about 12 as I don't want it making its presence too obvious. I find the software/alignment quite quirky and not so user friendly. I can't seem to get any sound test frequency to measure the room response, so I just do the standard 1-2-3 alignment holding the mic roughly where my head is in the listening chair.

Anyways, I know the above doesn't include many specific questions but overall am just looking for some best-practices tips on getting the most from this subwoofer. I listen to a broad selection of music and this system is also for movies.
128x128outlier

Showing 2 responses by outlier

outlier's avatar
outlier OP
381 posts
 
Thanks for the tips so far.

Yes, the sub was re-defaulted and aligned for my room based on the auto-calibration I did.

I am getting some bloat, or at least i find I have to adjust volume downward sometimes as movies in particular seem to make the bass a bit more noticeable than I would like. I'll try and connect the sub direclty and let the speakers go full range and will see if things get a little better.
outlier's avatar
outlier OP
381 posts
 
Hi Guys:
Thanks for the extra input. Yes, I have video connected to the sub (strangely enough, via a bit CRT front projector) so I can see the visual cues for calibration.

However, I do not seem to get any sine wave sound. I can play music, and i can see the wave drift from left to right and it's clear that the microphone is picking up the music and reflecting the frequencies etc., but I can't seem to get any calibration sine wave sound.

If I press the standard 1-2-3 for general room calibration, I get about 20 or so pulses which shake the room, and that lasts about 1 minute, so I that seems to be working fine.

Just to clarify then, the recommendation seems to be to run my speakers full range, and connect the sub to my pream seperately, but focus the sub on lower frequencies only. I should start the sub where approximately my mains cutoff?

thanks again for the tips. I wish this calibration stuff was easier
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