I am trying to convince a friend why he should get two subs as opposed to one, but don't know the technical reason why 2 are better?

Is there also a non-technical reason why 2 are better than one?

 

Well there is the 'technical' reason that there is twice the cone area.

But you also have to factor in if they already have an amp and what it is stable to. This would dictate the voice coil configuration.

 

I had 2 now i have three, Three is better then 2!....

 

oh yea? 2 15's is better than 3 12's [img]tongue.gif[/img]


To the original question, more cone area=louder. The amp doesn't make a huge difference, as long as you have clean power, you're still moving twice the air.....with more power you move even more air.....rule of thumb is, double your cone area, you increase SPL by 3-4 Db....or so I'm told...this is not always the case though.

 

By that rule of thumb...his 3 Twelves have more surface area than your two 15's.

Matching impedance with 3 woofers would be more difficult than with two. Unless you were running, for instance, a JLAudio amp where impedance doesn't matter. It will still produce the same power at 4/2/1 etc ohms.

 

Sub quantity depends on what you are trying to achieve. one is not better than the other


Lethal I know JL says there amps regulate power into all impedences but I think if you measured what the amp actually does you would be in for quite a shock.

To sum it up, my understanding is [img]graemlins/bs.gif[/img]

 

2 better than 1

Maybe a good formula with money....as in having 2 dollars is better than 1 dollar.

With 2 subs you get twice as much cone area as one sub....dont know if that is better...I suppose for the majority of people it is.

 

By that rule of thumb...his 3 Twelves have more surface area than your two 15's.

Matching impedance with 3 woofers would be more difficult than with two. Unless you were running, for instance, a JLAudio amp where impedance doesn't matter. It will still produce the same power at 4/2/1 etc ohms. </font>[/QUOTE]3 12's does not have more cone area, do the math.

1 12" would have approx 60sq" and 1 15" would have approx. 110sq".

Therefor, 3 12's = 180sq"
2 15's = 220sq"

 

Lessy,

A 12 inch woofer has approx 108 square inches of cone area.

A 15 inch woofer has approx 168 square inches of cone area.

Therefore (3) 12 inch woofers and (2) 15 inch woofers have almost the same cone area (324 vs 336)