Shadorne, I think it depends upon the distance from the rear wall and the construction of that wall. Frequencies below about 45 hz or so pass through typical sheetrock walls and so no cancellation takes place. Therefore speakers more than 6 feet or so from this wall will not be affected by 1/4 wavelength cancellations. If the wall is reinforced then it is still O.K. if the speakers are more than 8 feet or so away as the loss will be attenuated by typical " room gain" below 35 hz or so. If 6 or 8 feet is not practical then try pushing the speakers very close to the rear wall and use thick absorption behind them. ( thick enough to absorb 125 hz) If this is not practical then yes nonalignment is a good idea. My bias is that the same frequency (crossover region) coming from two different sources at two different distances always creates phase issues and its own cancellation issues as well as slurred imaging in frequencies high enough to be directional. A lower crossover of course limits the damage of the last issue but not the first two. Each case is unique and the only way to know for sure is to experiment which in my experience takes a lot of time and patience and in any given case can lead to unique solutions. JMHO - Jim
Stereo Subs - Do they need to be identical?
I'm thinking of getting a couple of subwoofers to mate with my MBL 121 monitors. Generally, I've seen setups where people use two subs of the same brand and size. I'm wondering whether it can make sense to use two different sizes. For example - a Venoyne DD12 and a DD15. I'm likely going to go with Velodyne DD series or JL Audio.
In particular, I note that the big Velodyne 1812 uses an 18 inch and 12 inch woofer, with suppsed benefits in terms of speed (12 inch) and extension and depth (18 inch).
In particular, I note that the big Velodyne 1812 uses an 18 inch and 12 inch woofer, with suppsed benefits in terms of speed (12 inch) and extension and depth (18 inch).