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I've read on here that this is a bad set up

The perceived difference probably comes more from your 10s being closer to you than from the added 15.

Another reason this could be bad is that the speakers may interfere with each other in unpredictable ways, resulting in uneven constructive and destructive interference patterns.
 
This is shot of me 10 years (and several pounds) ago. I'm running full range into the 410 cab and through a crossover sending only 150hz and below to a separate Crown amp for the 18" speaker underneath making it a subwoofer. This rig killed. If you're running the speakers with separate amps you should be OK.

QuiZling-10-20-02-7_zps1a2f09e6.jpg
 
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If it sounds good, it is good.

Thousands of bassists used 4x10+1x15 stacks in the 80s and 90s, and the world didn't end. ;)

I used a 410 and a Cerwin-Vega 118. Then I got a Peavey 810tx and a Peavey 215. I actually have fond memories of the 215, but not the 810. Go fig. Must be the porting on the tx.. and the tweeter I blew twice. When I have a way of moving it, I'll look on CL for Ampeg 810s (they go for about $500 used here) or those old Peavey 215s (they go for around $75-$150 here) again. Either way, I don't think I've ever run two of the same cab, and definitely not in the 90's when I did most of my active playing out.
 
I just hooked it up at my practice pad, I played a few songs with my band and it sounded better then the 4x10's alone, but not as good as my 6x10. I was just experimenting with my stuff
there's the principle in a nutshell!

the mixed stack is taller and sounds bigger and louder than the single smaller cab, making it technically better; it's just that the "matched" setup of roughly equal size (the 6x10 cab) sounds better still.
 
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This is shot of me 10 years (and several pounds) ago. I'm running full range into the 410 cab and through a crossover sending only 150hz and below to a separate Crown amp for the 18" speaker underneath making it a subwoofer. This rig killed. If you're running the speakers with separate amps you should be OK.
Well now, if you're going to do it, that's the way to do it. It'd be worth trying an HPF to the 410 at the 150 Hz cutoff to avoid any significant interaction between the cabs at the lower frequencies. It may or may not make a lot of difference.
 
From where ?

Did you just try it out, and stand a couple of feet from it ?

Or did you gig with it, and check from all areas of the room you were playing to check for boominess and nulls ?

While in transition from one rig to another, there was a short time when I had a 4-10 and a 1-15. Standing close to them, it sounded good. The higher cabinet allows the mids and treble to be heard without getting considerably away from the stack. Then I was reading about the problems with mixing these very different cabinets. From some experimenting by walking around the the room while playing, the severe peaks and voids could be heard. Sure, there are peaks and voids in any room, but this sounded like there were more of them and the boominess that Bass_pounder mentions was really bad. Then the 4-10 was put on the floor and the 1-15 disconnected. Another walk around the room and the sound was much more even. BTW, I did the same test with just the 1-15 and the result was like the 4-10 alone. Soon after, the 1-15 was sold and just the 4-10 has been in use since.
 
Well now, if you're going to do it, that's the way to do it. It'd be worth trying an HPF to the 410 at the 150 Hz cutoff to avoid any significant interaction between the cabs at the lower frequencies. It may or may not make a lot of difference.
The way I approached it was I got my "sound" with just the 410. Then dialed in the 18" just enough to add the "feel". Whenever I played smaller clubs I just used the 410. Technically you're right. I just shied away from changing the sound I was used to hearing from the 410. I just wanted the 18" to add the very low end that got lost in the larger/outdoor venues.
 
I actually enjoy threads like this. It brings out all of the 'folks' who are determined to save us from ourselves. They show up early in every thread like this. For the record, I do not mix dissimilar cabs. For the same reasons that the 'anti-mix folks' don't. In fact, I bring just one cab to a gig or rehearsal. But it is entertaining to watch so many get their panties in a tightly knit bunch over this topic. It's part of what makes Talkbass so compelling. I saved the OP's pic to my computer. Whenever I feel mischievous maybe I'll pretend that it's my photo and start a thread just to get the usual suspects all worked up. Now, if I could just find a quality pic of a 1x15 sitting underneath an 8x10. Oh, yeah. ;)

M. M. :)
 
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