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18" ultimax no spl under 30hz. Something wrong with the driver?

DIY Speakers and Subs - www.avsforum.com
My setup

Full martysub with um18-22

Inuke 6000 dsp

Emotive xmc-1

Room around 30x45x20, that's counting all the open spaces, tiles as my floor.

1.So I finally decided to use ReW to measure my subwoofer and I am pretty disappointed. I basically get no spl under 30hz. I understand the room is pretty big but I thought I could at least get some decent spl from 30hz to 17hz.

2. I have my inuke 6k limiter set at 1200watts and HPF at 17hz. Will I damage my um18-22 and amp if the limiter light is constantly on?

3. I also noticed that sometimes when I increase the volume of my xmc-1, I hear a weird clicking noise, kinda like a gear is changing or something. Anybody know what's the problem?


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