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1x15" vs. 4x10" ?

Your math must be off - adding a cab while keeping overall wattage the same should not be less than one of the cabs at the same wattage…
It absolutely can be if the sensitivities are different enough. But that is not quite the case here.

At 800W the calculated SPL of a single 410 is [Log(800) x 10] + 104 = 133dB.

410 + 112 at 800W
I believe the combined SPL of both cabs will be about 133.9dB. So you gain less than 1dB by adding the 112.
 
Glad I ran across this thread…. Looking at Glenzler stuff right now. I play upright at coffee house type gigs, and then electric with a full band. I’m debating a 1x15 with a 2x10 for full band, and then just the 2x10 for upright. Or should I just get 2 12s?
 
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Glad I ran across this thread…. Looking at Glenzler stuff right now. I play upright at coffee house type gigs, and then electric with a full band. I’m debating a 1x15 with a 2x10 for full band, and then just the 2x10 for upright. Or should I just get 2 12s?
It's not really a question that can usefully be answered, because the character of different speakers varies so much.

It's true to say, for instance, that the resonant frequency of a typical 15 driver is lower than that of a typical 10, but it's also true to say you can get 10s with a lower resonant frequency than most 15s. Put them in enclosures, and with all the enclosures targeted at the same instrument and it gets even more difficult to generalise.

To make it even more complicated, although I used to think mixing speakers of different drivers would mean I got the best of each, it seems one is as likely to get the worst of each.

If you're restricting yourself to a single brand it's easier, because the manufacturer may have designed a given range to play nicely together. They may even have succeeded. It worries me a little that I don't seem to see ads that tell you combinations not to try.

I also wonder if by the time a 1x15 and a 2x10 have been optimised to play well together they have a tendency to sound so similar you might as well have two the same instead of one of each. So really you've got to listen to stuff, but it may not be practical. In that case go back to basics. Two cabs the same is safer than two different. If two 15s feels uncomfortable then choose between 2 2x10s or 2 1x12s. The 12s are lighter, smaller and quieter. The 10s are bigger, heavier and louder. Which ticks most boxes?
 
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He is asking about Genzler BA cabs specifically.

and they do play nice together…

15s do have more low end extension vs the 10’s or 12’s but 2x12 is similar to 1x15. The advantage being modular and bringing the sound projection closer to your ears …

1x15 is a louder and cheaper single cab solution.

2x10 - about the same loudness to the 15 but emphasizing more low mid with less bottom extension.

tbh with the eq section on your amp, it’s easy to get similar tones from all those cabs. What really sets them apart from anything else out there is the high mid / tweeter array.

no fuzzy highs like you get from a lot of cabs.
Amazingly wide projection.

after trying these, I was all in for Genzler - now I have 3 of the 12’s and both Magellan heads (a 350 and an 800 - grabbed the 350 as backup and leave it at rehearsal space)
 
I am a "doubler" (half the gigs I do are on upright and half are on Fender Bass. For one band I play both on the same gig). I have a Genzler Magellan 800 Watt amp head with a Genzler 1x12" Bass Array cab (with the tweeters in front). Thats my main rig. When I play Fender Bass (typically a P with flats) in a six piece country band in big halls I put the 1x12 on top of a 1x15 Electo-voice cab. It sounds pretty good but am contemplating replacing the 1x15 with the Genzler 4x10 bass array for a punchier tone. Any thoughts on the difference? The Genzler 4x10 is pricey, almost $2000!
Thanks to everyone for their thoughtful responses. For now I am going to stick with my current configuration as I recently gave into the G.A.S. and purchased a 2006 MIJ Butterscotch reissue of a 1951 P Bass AND I bought a 1 year old slightly used Fender American Professional II Five String bass. Need to give the old bank account a little time to recover. I will get out there and test drive some used 4x10's though at some point. $1900 seems like a lot for the Genzler but some of you state it is worth every penny!
 
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He is asking about Genzler BA cabs specifically.

and they do play nice together…

15s do have more low end extension vs the 10’s or 12’s but 2x12 is similar to 1x15. The advantage being modular and bringing the sound projection closer to your ears …

1x15 is a louder and cheaper single cab solution.

2x10 - about the same loudness to the 15 but emphasizing more low mid with less bottom extension.

tbh with the eq section on your amp, it’s easy to get similar tones from all those cabs. What really sets them apart from anything else out there is the high mid / tweeter array.

no fuzzy highs like you get from a lot of cabs.
Amazingly wide projection.

after trying these, I was all in for Genzler - now I have 3 of the 12’s and both Magellan heads (a 350 and an 800 - grabbed the 350 as backup and leave it at rehearsal space)
Do you play Fender or Upright bass through the Genzlers?