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Mixed cabs, double dog dare me

My bedroom cab is a barefaced one10. At these volume levels (turn it up until the glasses in the kitchen cupboard rattle, then turn down a notch) I could not ask for more, total sonic bliss.

The thing that is frowned upon here on talkbass is the classical 410/115 combination.
A maxed out 500W head would pump 62,5W in each 10" speaker while pumping the whole 250W into the 15".
The result often is a 15" speaker beyond its limit mixed with 10" speakers that barely are breaking a sweat.
Anyone claiming that the bigger speaker delivers the lows is invited to put those speakers side by side and connect only one, max out the bass and hear for himself.

There are lots of combinations that work great, as long as the mismatch between the power handling of the cabs and the difference in SPL is not too big. If you happen to have several cabs sitting around, feel free to experiment.

The safe route is to find a cab where you like the sound and then buy as many of this cab as you need to be loud enough.
 
For at home, it probably won't matter much as you likely won't crank things too loud.
Quick Review by example:
Two cabs... one is a 2 x 10 one is 1 x 15, each cab is 8 Ohms.
The power splits evenly between the two cabs, because of equal impedance.
So half the power goes to one cab, half to the other.
The 15 is getting the full half (if that makes sense) the 2 x 10 is splitting it's half in half again.
Each 10 is getting just a 1/4 of the power vs the 15 getting half.
The 10s are not working as hard as the 15.
The fifteen might fart out before you get to really get what you want out of the tens.
But it depends a lot on what you have going on.
More difficult to explain is that somewhere in the venue (not your bedroom) the differences in how the sound projects from the different cabs could affect how the combination sounds. Could be good, more likely it will be poopie.
Having the same cabs in a pair reduces the chances of all of the above being on the poopie side of the scale.

If you had a 2 ohm stable amp you could do a 4 ohm 2x10 and an 8 ohm 15 and every speaker would get 4 ohms thus the same amount of power right?
 
If someone wants to add a second cab, the questions to ask are:
Do I want more output than my one cab is capable of delivering? or Do I want different tone than my one cab is capable of delivering?

Mixing cabs is a crapshoot. You can waste time and money chasing a moving target. If you want different tone, get a different cab. Then, if you feel you need more output, get another one of the same.
 
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Tell me again why I shouldn't mix cabs? This is not a joke, I'm serious, especially when I'm just jamming/playing in my room; Does it really matter then? Is it only frowned upon when you're playing out live? Am I better off just getting two 1x15 cabs instead of getting a 1x15 to add with one of my 2x10's? I really miss the fullness and warmth that you can only get with a (really good) 15 inch speaker; ala Mesa Boogie, Ampeg ... unless of course you're running an 8x10 "fridge" which is entirely way too big for me at this time.

You can mix cabs sometimes ...

Both cabs should be about the same size and both should be 8 ohms
 
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Mixed driver sizes can in fact sound as good OR BETTER than identical sized drivers IF they are designed to work that way from the start, if they conform to the necessary math and physics models of the acoustic system.

Listen to da man on this!

There are others, no doubt, but the Mesa Subway cabs are a good demonstration of that point. I've used a 12 cab with a 15, and tonight I'm gonna use a 2-10 with a 15. The Subway cabs play nice together, in any combination. That's one of many things I like about 'em.

That said there's good sense in the conventional advice to avoid mixing driver sizes. When that _crucial_ design work hasn't been done, it's a crapshoot whether any particular combination will sound good or sound poopie. And the odds (speaking of _crap_shoot), IME, tend to favor it sounding like poopie.
 
At one point I my "career" as a bass guitarist (very early 90's, IIRC), I had two 18 cabs and two 4 x 10 cabs, 1600 Watts of power (800 high/ 800low) with a crossover to put the deep stuff into the 18s, midbass on up through the 4 x 10s.

It was a pretty darn good setup, especially against to guitarist with 100 Watt Mesa and Marshall 4 x 12 rigs!

And that was just for playing clubs with out any FOH (and even a few that did)!

Goodness, were we really THAT loud back then?

Now, I'm just happy with my 810, although the single 15 cab (or pair maybe) for a second channel is very appealing!

As I've always said, whatever works/sounds good to you, IS good!
 
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Why chase power distribution between mixed speakers, with out understanding how they pair up in the first place? Wrong thing to concentrate on when there are more important factors, namely how does the everything sound.

YMMV.
Right, how does it sound?

In properly designed speaker families, sensitivity, power distribution, phase response, voicing and polar patterns have all been taken into account.

When done properly, it opens up additional possibilities that bay not be practically possible with a single driver model.
 
Tell me again why I shouldn't mix cabs? This is not a joke, I'm serious, especially when I'm just jamming/playing in my room; Does it really matter then? Is it only frowned upon when you're playing out live? Am I better off just getting two 1x15 cabs instead of getting a 1x15 to add with one of my 2x10's? I really miss the fullness and warmth that you can only get with a (really good) 15 inch speaker; ala Mesa Boogie, Ampeg ... unless of course you're running an 8x10 "fridge" which is entirely way too big for me at this time.
Try the search engine. This is explained ad nauseum. No one is saying it CANNOT work, what is said is that the best chance of getting a good outcome is to use two matching cabinets.

You've been sold a bill of goods that all 15" speakers are good for bass and all 10" speakers are good for mids.
 
Playing in a room.

That's what I do all the time.

I have two 1x12 cabs. I almost never use the second cab because it doesn't add anything tonally except volume. Often using two will mess up the tone I got with one.

I alternately play four basses in that room. And they are all tonally different and it can't be fixed with fingers.

I was thinking of getting or adding a 15" to get better lows and tone. Until I realized it's not the amp/cabs...it's the room acoustics and the strings I use and the type of bass as well as several other factors.
!2's should be able to cover the sound spectrum. Personally I wouldn't use a single 10 but having never tried a 4x10 cab I can't comment on that.

Which is why I bought an Empress Para EQ a while back. Fantastic little EQ. You can pinpoint and take out undesirable tones or add/boost ones you like. It is way ahead of a slider generic EQ like the Boss GBE-7 which I also have.

This combined with a ton of time moving the single 12 around to different places in the room plus trying different elevations of the cab (and believe me the placement and certain elevation makes a huge difference) until I found sonically what I was looking for.

For me I don't like a ton of volume in a smaller room space. I prefer quality over quantity.

Just automatically adding a 15 to your 2x10's might not necessarily get you where you want to go. There's way more to it than that.
 
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Sounds like you are having a lot of fun. My bedroom/practice amp is an old (USA) HARTKE kickback 10. I gig with a 300 watts and a single 15. I went through a period of using multi size drivers and cabs. I use to bi-amp a QSC-USA 800 and Alembic F1-X into a Hartke 115XL on the bottom and a 4.5Xl (4x10) on the top. I thought it sounded great and it looked killer until one day I bridged the poweramp and ran it full range into the 4.5XL. It sounded better and only 1/2 as much hassle to move around and setup.
 
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For at home, it probably won't matter much as you likely won't crank things too loud.
Quick Review by example:
Two cabs... one is a 2 x 10 one is 1 x 15, each cab is 8 Ohms.
The power splits evenly between the two cabs, because of equal impedance.
So half the power goes to one cab, half to the other.
The 15 is getting the full half (if that makes sense) the 2 x 10 is splitting it's half in half again.
Each 10 is getting just a 1/4 of the power vs the 15 getting half.
The 10s are not working as hard as the 15.

The fifteen might fart out before you get to really get what you want out of the tens.
But it depends a lot on what you have going on.
More difficult to explain is that somewhere in the venue (not your bedroom) the differences in how the sound projects from the different cabs could affect how the combination sounds. Could be good, more likely it will be poopie.
Having the same cabs in a pair reduces the chances of all of the above being on the poopie side of the scale.
Finally, an explanation ^ that makes sense.