Eh hem!...Subwoofers... What do ya know?


Subwoofers are a thing.  A thing to love.  A thing to avoid.  A misunderstood thing.  

What are your opinions on subwoofers?  What did you learn and how did you learn it? 


128x128jbhiller
Hi m-db,

      I wish I could speak to it but I didn’t take advantage of the SVS DSP. I didn’t think it could really compare to the processing power of REW and MSO. Using those programs with the Earthworks Mic I could see what was happening in the room and angle, move, shift the speakers for an optimum result. As others have noted, placing four 150lb subs in the room can be challenging. I also was integrating two subs that don’t have the DSP built in so I opted for one total solution rather than mixing them. It’s pretty exciting to see the hot spots and what MSO does to combat them using time delay, inversion and some wild looking slopes. I also time aligned my mains to the listening position at the same time. It’s easier than you think once you try. It’s just a path that isn’t well tread and it took me a lot of reading and trial and error to get it all to work. I’m a firm believer that the two most important parts of the system are first your speakers then the room. 
I bought the SVS because of their quality 1,500W MOSFET amps and massive driver motors and bracing they have internally. They can keep up with the Kinergetics driven by my Pass amp very well. I will also say that the SoundPath feet offered by SVS are a huge bargain. I had nasty vibration induced distortion in the room till I bought those and put them on all the subs. The rubber durometer is perfect and totally isolated the subs from the floor and the bass became so much clearer. I also have everything connected via balanced cables, it’s dead quiet. You can hear a pin drop and the ‘lovely’ tape hiss on older recordings. 
The OP asked when we learned about Subs and I knew how important it was playing in an orchestra as a kid. There are vibrations from a live performance that can’t be “heard” but are essential to the experience. That’s when I started reading about music reproduction and the physics behind it. . . Love how accessible sound is. The highest sound we can hear is 1” long the deepest is 50’ long. It’s amazing. And once you know the science it makes sense why a sub array is such an effective tool to counteract the physics of the room. You’d need 50’ of dampening material to absorb the wave and prevent a back wave from reverberating in the room which simply isn’t possible and why one sub is usually so hard to integrate properly even with DSP as the other speaker waves are truly the vehicle for DSP to be effective. What a great hobby. . . 

I want to be clear on my position in a few ways:
  • Multiple subs are great
  • 1 sub, properly integrated is much better than most people know about.
  • Hsu makes great subs too, and more people should try them.
Does anyone technically know what happens when you aim two subs at each other?  Say a foot or 2 feet apart . Is there an ideal distance apart to do with frequency? Does it have an affect on the opposing woofer itself such as improving the rearward movement of each other? Would have to be a specific distance i assume . A possible equation ?
Reason i ask is i have 2 x18” jbl 2245 aiming at about 20” apart and hung from the underside of floor . And they sound incredible . Not  boomy sound but accurate and on cue. They have a very black background. And only reveal themselves when there is very low program material. 
If you time align the back sub to fire when the front wave hits him and you also phase it 180 degrees, theoretically both waves cancel each other and you don't hear the reflections again