Originally Posted by Polyrythm1k
Hey thanks. I have 3 subs in my system and FR down to about 14hz, but I’m on concrete. Ugh. While IMO there are benefits to concrete, it eats TR and while I can shake the couch, it’s not so easy. For a long time I’ve thought of different stuff, like a passive riser, or MA’s, etc., even installed some cantilever type boards IN the couch, attached to the frame. The idea with those was supposed to be like a tuning fork that would resonate with LF content. Pretty sure they did nothing lol. My wife’s legs aren’t very long and she nuked my idea for a riser lol, so that was out.
I had seen a diy MA someone made with a deconstructed driver but seemed like it wouldn’t be effective. About that time, I thought of turning my couch into an enclosure for that old unused driver but couldn’t reconcile everything needed for that.
That’s exactly the time I started reading about the BOSS and how it’s basically an IB. Exactly what I needed! I do think the mini riser would be most effective, and non intrusive, but I have to concede to WAF once in awhile, so my plan B is a full length baffle in the couch with 3 drivers. The single driver can be slightly directional from cheek to cheek lol, but nothing like when I ran it crossed at 80 before I could run it through the minidsp. The driver has about an inch of clearance, face down and is wired in reverse. In phase just felt weird. Now I’m trying to work on the balance between my far field subs and couch. So far good TR in the couch seems to take away from the “room” and subs. It seems like a low shelf at maybe 5hz with a steep rise from 25-30hz on down might work best for a natural feel. Maybe? Currently 30hz lpf, and 24db slope.
Anyway, great thread. Love seeing all the ideas in here.
Poly....Thanks for the update on your BOSS build and additional details about your room and far field blending. Good idea on the "tuning fork" design concept inside the couch....now that's thinking outside the box!
Great to hear you're getting good TR with the BOSS baffle mounted to your couch. That's always the biggest challenge on concrete....getting ULF TR to the butt
The advantage of concrete is there's no floor bounce to have to mitigate if it doesn't feel natural.
So now with your BOSS platform, you can control the bounce and tune it accordingly for what feels right. I didn't see mention if you have the rubber isolators prescribed in post 29. If not, I'd recommend putting those underneath your couch between the feet and the floor. That will help with the BOSS tuning also. Once you have the isolators underneath the couch feet, it's just a matter of additional fine tuning like you're doing now.
Some members with stiff couches and firm leather cushions have found LPF's lower than 30Hz and sometimes even lower than 20Hz have made the BOSS experience more natural.
Others with older and not-so-stiff furniture frames and cloth seats have found LPF's up to 80Hz to feel natural. So, I think the LPF setting depends largely on the type of furniture, cushions and coverings also. Having the ability to apply LS filters for the single digits using the mini-DSP is icing on the cake!
Hope some of this feedback helps.