Lots of bass at walls, lack of bass in center of room/listening position


I guess this is relatively common in listening system. Is there any way to smooth this out so I get more bass energy at my listening position? This happens with our without my 2x 18 inch subs. Room is 12 x 16 x 8 ft, speakers 4.5 ft apart on long axis and I am sitting 4.5 feet away. I tried moving back and forward but the entire middle center of the room except near the walls has decreased bass.
Is this a boundary effect or could it be due to bass cancellation effects?
smodtactical
He has NS5000... not NS1000... how did you make that mistake?

Enthusiastically!

Refunds are in the mail.

Still, the basic FR issues appear shared. 
@golfnutz Ya I think making them myself makes sense, can save a ton of cash. I wonder if I can order the wood pieces cut to precise size via home depot and have them delivered or something with the rockwool. And just order the fabric as you said, awesome plan. So then I just nail everything together and staple?
Just curious I heard some people using this special denim material that is a bit safer? Any thoughts on that?

@erik_squires Appreciate it man but ya I think NS5K is a totally different speaker.
OP,

OK, I see the confusion. When I do an image search I get a lot of the Be series of Yamaha’s show up as NS 5000 speakers.

If this is the new, Zylon speaker, then the FR does not make sense to me at all.


Best,
E
Yeah, I saw the recycled denim stuff, but it didn’t appeal to me. It just didn’t look rigid enough for what I wanted.
Actually, I glued, then used a brad nailer to secure the frame. Using glue and finishing nails would work if you don’t have a compressor.
Don’t overlook the Cambric material and 3M adhesive spray. It makes a difference. You’ll save money by not having to cover the back of the panels with Guildford of Maine cloth. I wrapped the entire batt with it (cambric material).
You could see if Home depot will cut to size and deliver, but you need to order the right wood. If you go there yourself, you can pick the best pieces (straightest, and less knots). They’ll cut it for you there as well.
Something like this for the walls or ceiling (lumber edges are rounded and smooth):
https://www.homedepot.ca/product/thd-generic-1x2x8-framing-lumber/1000173739
For 3" for Bass traps you could use this:
https://www.homedepot.ca/product/thd-generic-1x4x8-millstead-spf-sdry/1000100188
You’ll probably want some D-rings for hanging them. Each panel will weigh almost 10 lbs (over 20 lbs for Bass traps), so I used these - https://www.homedepot.ca/product/ook-large-2-hole-d-ring-hangers-value-pack-10pcs/1001027224
@Smodtactical, I suggest you purchase a Minidsp. You have already invested a significant amount in your system. The Non-Hd version of the Minidsp is $100. The HD version of the Minidsp is even better and can do more.  

It  appears you are using REW and that is a good thing. REW will generate equalization filters specifically for the Minidsp. You then load them into the system via computer. There are videos on the web to guide you through the process.   

There is a learning curve to all of this. You are getting many suggestions all with good intentions. The bottom line is you have to experiment and learn as you go. Don't give up, and have fun on the journey.