Originally Posted by craig john
I don't need anyone to explain the difficulties of setting up multiple dissimilar subs. I, myself, have posted many times on the benefits of using multiple identical subs, especially on the benefits of gain-matching identical subs. I've also posted many times on the difficulties of integrating dissimilar subs, whether they be sealed or ported, as well as the difficulties of mixing sealed and ported subs. I agree that it is more problematic to mix and integrate dissimilar subs. That doesn't mean it can't be done. The Geddes technique is probably the best technique to attempt to do so. That's all I'm saying.
Your advice that mixing subs with different tune points will result in "more harm than good" is generally true if one is using the traditional level-matching techniques with little or no attention paid to placement. However, the Geddes technique uses placement and level settings to optimize multiple subs while it minimizes the issues of dissimilar subs. That's all I was pointing out. There IS a way to do it, which you seemed to not recognize.
Your assumption that the OP has neither the financial resources or the interest or ability to invest in measuring capability is unfortunate. *I would expect that anyone who cares enough about their bass to invest in multiple subs would also have the inclination to learn how to optimize them.
If you want to read about why it is less useful to place subs in the front of the room on either side of the display, Google search for "mutual coupling of subwoofers." Subwoofers that are within a 1/4 wavelength of each other will "mutually couple" and propagate as if they were one subwoofer. IOW, there will be little if any beneficial effect on the in-room FR with that type of placement. You need physical separation of the subs in order for them to drive the room with different transfer functions.
And neither do I.
Thanks for acknowledging that I have been correct in everything I've stated. So I don't see why this debate is evening happening.
I never assumed
that the OP didn't have the budget or ability, I said when he has the time and
budget. That's two variables.
I never said there wasn't a way to integrate two different ported subs, I said it was just difficult to do, right?
Please stop twisting my words and getting them all jumbled up as you're typing. I mean, this is all in text, so....
*I suggested multiple subs of the same make and model, right? I also suggested to avoid multiple subs with different tuning points because they are harder to integrate, right? I suggested a sub-crawl to find better placement spots, right?
I don't understand what you are trying to debate on. You're so dense on the fact that I suggested avoiding subs with different tuning points for the sake of the difficult EQ, that you're failing to see and acknowledge everything else I'm saying. So stop derailing this thread about Earl Geddes showing how to EQ different tuned subs, which literally has almost nothing to do with the OP or anything that I've said since the OP doesn't seem to be keeping 3 subs, it's either two PB-2000s or 1 V1800.
You also might want to rethink your last paragraph. OP mentioned localization issues (if you even read that). A 60hz freq. has a wavelength of about what? What's ¼ of that? What's the distance between the two subs across the front stage?