@audio_guy_uofw I agree with your point. Stacking subs like the REL concept is good if the implication is to allow sound to more focal and directional which this curtails an "array" sort of speak. Logically, this will only work if you have a big enough room but it is not going correct acoustic room issues. Only way to correct is room nodes in a fixed environment is either physically moving the speaker or seating location and treat the room or electronically apply processing which is more complex to achieve without the tools and resources.
BTW, I still have my REL sub and I might not let it go anytimr soon but the Velodyne SC-8 pair just has more body and inpact then the REL but the REL is more musical. I like both REL and Velodyne along with SVS and Rythmik but they all have different philosophy and agenda. You need to find with one works for you.
@tcutter Excellent data on the benefits of distributed subs. Google "Tod Welti subwoofers" for some interesting research and data on the impact of multi-sub arrays and subwoofer placement.
The corner placement is also a good location. I ended up moving mine out about 12". An added benifit is running the bottom sub at 40hz and the upper sub HIGHER at around 60hz to gain midbass. They MUST be stacked as close as possible to couple properly. Feet removed. Thin rubber shelf liner between them.
Double the amplifier power = +3 dB
If each subwoofer has its own amplifier producing the same output as before, you've doubled the acoustic power.
Doubling power gives a 3 dB increase.
Double the cone area = +3 dB
The cones are moving together in phase.
The effective radiating area doubles, so they move twice as much air.
I assume your system has a way to adjust response to a target you want to work with? If you don't and add 6dB in part of the frequency response...it won't sound true to the source. Maybe you'll like it, but that's a different point.
Doubling the amp power does indeed add 3dB assuming both amps are still playing at the same power as they did before, which shouldn't be the case if you are preserving the target response.
Same thing with doubling the cone surface: if the amps were driven at the same power as before that would add 3dB, but they shouldn't be per the above.
Maybe your system doesn't allow to adjust to a target curve and you are indeed adding 3dB and you like it better. Maybe you were needing a boost in the lower octave.
Or maybe you did adjust to a target curve and then the subs are now working at half the prior excursion and distortion is much lower and is audible. Not sure what subs you have.
In my case, going from 2 Rythmiks F12 to 4 didn't make the bass louder (as I did adjust the power to a target) and I couldn't tell if they were distorting less (they weren't to start with), but the improvement came from a more homogeneous bass response across the room.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.
