I am confused right now because when I add in my sub, a dual opposed SI 18, I test with REW to have more output. However when I turn off the sub, I feel the bass much stronger. My current HT is an unfinished basement. The total size of the basement is around 1400sqft, however I have my room tucked into a bump out that is 13 x 20. The back is wide open to the basement. I am surrounded on the front, sides, and floor with concrete.
My system consists of:
Mains DCM -KX12
Sub Dual Opposed SI 18 running off an EP4000
I have had my dual opposed 18s working for the last week. I like the way they sound, and according to my UMIK I can get over 120dB at 15Hz and up at my LP. I can probably go louder, that is just where I stopped testing. I am confused because I have DCM KX12 mains and as the name implies, they have 12" woofers. The speakers are very capable of putting large amounts of bass at high volume.
Anyway, when I add in my sub, I lose impact. I can tell that the system digs deeper, however I don't feel it anywhere as much through the couch. When I turn off the subs in my Onkyo TX-NR818 I have a lot of impact and it shakes the couch. With the sub turned on, the feeling of exposive bass disappears to a large degree.
I am a bit confused because it is obious with REW that I am getting more bass at every frequency with the addition of the sub. The thing I notice is that the main speakers without the sub produce impactful bass, however it doesn't feel as deep. When I add in the sub it sounds deeper.
I have tried crossing at various frequencies from 40 up to 150 and it doesn't bring back that feeling I get from just the mains. I have a feeling that the mains are playing the notes at a higher pitch than the sub, thus I feel it more.