Second sub to fill vertical null in 8ft high room

[siggen]

I have one SVS SB2000 (non pro) sub in the listening room/tv room. Room is 18 x 17 x 8ft. MLP is a couch at one long end. Behind the couch is a big opening to the kitchen. I get a bass null at about 70Hz at my ear height of about 33 inch. If I stand up, the bass is louder, and speakers sound much better. AI tells me to fill in with a second sub, placed at a height, or next to the couch. There is no place near/behind the couch. I can put a speaker on a wood shelf behind the TV, but there's only room for something like the SVS 3000 micro. Will this be enough to fill out the bass null? I dont care too much about movie sound. The SB2000 I have is more than enough to get loud LFE. This is for music only, playing from a Wiim Ultra into an amp. I would be just splitting the SUB out from the Wiim Ultra to the two subs. Thanks.

 

[Open Mind Audio]

Did you ever get any advice on this? I'm curious: Do you experience the null at that same height in different parts of the room? If it's just at the main listening position, then I'd think experimenting with the horizontal location of just the one sub may fix this. If it's at multiple locations in the room, always at 33 inches height, then you might experiment with changing the vertical dimension of the one sub. A second sub will help -- and is worth it regardless if you want to spend the money. But I'd focus on remedying the situation with one sub first for the main listening position - through horizontal and/or vertical movement of the sub -- and then add a second if you feel the bass could be more even throughout the room.

 

[siggen]

Thanks. I did raise my first sub, and set double bass ie mains + sub in the Wiim app's sub settings, then ran Roomfit. That seems to have done the trick. I'm not sure if there any drawbacks to doing this.