Hi,
Damping reduces port output, tuning frequency, impedance peaks and group delay. For subwoofers operating below 100 Hz damping material is not necessarily needed and might even be harmful if maximum efficiency/SPL is desired. I'd say, try it out and see if you like damping or not. A good case study with measurement graphs is found here: Data-Bass
Damping reduces port output, tuning frequency, impedance peaks and group delay. For subwoofers operating below 100 Hz damping material is not necessarily needed and might even be harmful if maximum efficiency/SPL is desired. I'd say, try it out and see if you like damping or not. A good case study with measurement graphs is found here: Data-Bass
Then I'd say add some damping. Just don't overdo it. I'm using an 18" driver in a big, low tuned undamped box myself - frequency range gets nasty at 150 Hz and port resonances around 200 Hz are a sight to see. For me it's okay, since I cut at 80 Hz, 4th order and so it sounds really clean and punchy, no boominess whatsoever. (I forgot to mention previously that damping reduces the port's self resonance, aka "organ pipe" resonance, too, and this is critical for a bass reflex box used higher than pure subwoofer frequencies.)
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