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[Dak446 10+ year member]

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[thorshammer1 10+ year member]

Honestly you will have poor results mixin. If your going to go with 18's or ? Sell the 13w7 to help get batteries,amps,wire etc... No I'm not saying that you'll recoupe enough to buy all this. Just concentrate on the pr. of subs and how to get them loud.

If ya don't believe it...try it, get it metered, then pull the plug on the 13w7 and test it again.

 

[Dak446 10+ year member]

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[cotjones 10+ year member]

Honestly you will have poor results mixin. If your going to go with 18's or ? Sell the 13w7 to help get batteries,amps,wire etc... No I'm not saying that you'll recoupe enough to buy all this. Just concentrate on the pr. of subs and how to get them loud.
If ya don't believe it...try it, get it metered, then pull the plug on the 13w7 and test it again.

See here is what chaps my ***... It is PHYSICALLY IMPOSSIBLE TO ADD MIXED SUBS AND GET A LOWER SPL!!!

This argument is TOTAL bullshit.

Regular same sized sub setups have "cancellation"

More accurately, they interfere constructively and destructively.

In a same size setup, theoretically, the patterns of this interference are linear, and constant.

The ONLY, keep that in mind, ONLY potential problems with multi-sub setups, are that the amplitudes across a frequency response are different across the 2 subs, making the total frequency response a little less linear, and that the patterns created by the differing amplitude signals creates a less constant pattern of interference...

When people say that they've hear the effects of cancellation are worse in the multi-size setups, they are usually referring to the effect where the patterns of cancellation cause a destructive interference spot to cross the listening point. (which is likely to happen at certain frequencies.)

HOWEVER there is absolutely NOTHING wrong with running Subs on one frequency range and midrange at another. As long as you have a high pass filter you should have a great setup with the 8's and 18's and there is really no need to set your sub low-pass down to 30 er 40,(at a 12db slope anyway) i have no idea what some of these people are thinking.

 

[audioholic 5,000+ posts]

The ONLY, keep that in mind, ONLY potential problems with multi-sub setups, are that the amplitudes across a frequency response are different across the 2 subs, making the total frequency response a little less linear, and that the patterns created by the differing amplitude signals creates a less constant pattern of interference...

We've discussed this before Cot. Define "a little less linear". Again, with impedance rise changes, frequency response between two different drivers (especially different sizes in different enclosures) can be quite dramatic.
And you cant just look at a few specs like fs differences and decide it will be a small change. When two identical speakers play the same freqs with the same amplitude etc, they will reinforce each other equally. This means the same frequency response you could expect from a single driver, only greater output. When you mix drivers, who knows what response will occur, or if the differences will even be the same at all output levels. Things go from very simple, to very complex.

The best solution, as said by a few people above, is dedicated midbass drivers in your front stage. With these, your subs wont ever be required to play over 50-60hz tops, even less than 2 octaves. And that will keep your localizable midbass up front where it belongs.

 

[mlstrass 5,000+ posts]

and with 2 SPL oriented subs there'll be no need for the JL sub...

 

[audioholic 5,000+ posts]

and with 2 SPL oriented subs there'll be no need for the JL sub...

Agreed. And the ported box for dual 18's would be huge as it is. Wouldn't that be funny to see, two 18's and a 13.5 in a wall.