It is a false assumption that larger drivers produce lower frequencies.
It was also false to assume that smaller drivers provide the same radiation impedance as the large ones.
Of course its possible to "stack" several small drivers which then in total provide a similar radiation impedance as a large one.
But in this case you'd have at least two electrical motors instead of one where only one motor can already do the job.
For the 410 vers 115 cosndiseration. To me it makes no sense nothing at all to buy and "schlepp" four motors where already ONE motor can already do the job (at low end) cause the motor drives a bigger cone in this case, thus "works" more efficient!
It's simply not true. It's all about cabinet tuning.
Nope, its not, not this way cause amplifiers such as a Fender Bassman don't "easily" tolerate soundwise "any" tuning yet it was still possible with SS amplifiers.
The vast majority of 410 cabs I have played can produce way more "low end" than most 15 cabs.
In this case I suppose these 410 cabs have shy mids at best (loaded with Legend BP110 or something similar) while the most part of 115's have drivers such as EVM 15L inside
Also, mixing cabs and driver sizes is often a recipe for disaster.
Sometimes it is, yes, but not often, may be my experience of about 45 years playing the bass guitar is too short to confirm "often".
Phase cancelation CAN be a problem. It's a roll of the dice.
CAN be, yes, but if you have a look on rather generic "standard" designs for instrumental bass guitar cabs you'll notice some "ballpark".
It makes me anyway alwyas little bit wondering WHY the matching camp frequently refers to "phase issues" while the more meaningfull issue of different group delay is totally obsolete in most part of all discussions by these folks.
Here you are:
Considerations on group delay of different cabs loaded with same driver
In first instance group delay relates to the damping of a cab.
Group delay of course is a "delay", but its not the same delay in the same meaning you'd get if two sources where of different distance to to your ears and than produce comb filter effects.
Group delay is very different to that!
If you would design a cab to get as much low end as possible you'll likely get lots of "critical" group delay involved.
If you would suggest a cab like this (with good extended low end) for an amplifier such as a Bassman, you might not do a good job to the OP who asked you a question!
In short, most single 15 cabs would not help OP.
I think it should belong in the OP's freedom of choice (and option) to check it all out in a store. And as I told above, it also may be he goes with the matching route if this fits his sound goals better.
They would add very little volume and likely no more "low end".
As I already told above, the OP should not expect "tons of sound". And even ~3dB with a matching cab is already little.
The question is, how much amount of little is too little to have an benefical effect?
There are exceptions. But they aren't cheap.
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The 115 cab I'm currently practicing with a band in rehearsal room is a pretty good and "deep" sounding cab. Its a Harley Benton cab respectively 115 combo. Hard to imagine it was an very expensive combo/cab.
