Kappalite 3012HO vs 3012LF-4

The Jack of All Trades pro-sound cabs.
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PeteyPablo
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Kappalite 3012HO vs 3012LF-4

#1 Post by PeteyPablo » Fri May 19, 2017 2:57 pm

I understand that the 3012HO is the preferred driver for the J12 lite but is there any reason to use the 3012LF-4 in order obtain a 4 ohm load with a single cabinet? I would like to use the J12 lite with an Aguilar Tonehammer 500 bass amp and maximize the 500 watt output. It seems that with the higher sensitivity the 8 ohm 3012HO should be louder than the 4 ohm 3012LF-4 even though it will receive half the wattage.

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DJPhatman
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Re: Kappalite 3012HO vs 3012LF-4

#2 Post by DJPhatman » Fri May 19, 2017 3:25 pm

The 3012LF, at any impedance, is NOT a recommended driver for the J12. I have 2 J12s, one is Bill's "proof of concept" cab, currently tweeterless, the other is an ultra-lightweight composite cab, built by forum member Monomer. Both have DeltaLite II 2512s in them. I power them with a G&K MB-2 500 fly-weight head. Using 1 cab makes everything in the house vibrate, using both makes the neighbors bitch. Build a single, load it with the 2512. If you are not getting enough volume from 1 cab, build another. If 2 cabs aren't enough, you need to :horse: out of the rest of the band! :lol: :mrgreen:

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The bottom most cab was built by Bill. The unconnected melded array is just propped up inside the mouth. The top cab was built by Monomer. In the rack case, from top to bottom, Goose Juice, Sabine tuner, Sennheiser wireless, and my G&K MB2-500.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

Grant Bunter
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Re: Kappalite 3012HO vs 3012LF-4

#3 Post by Grant Bunter » Fri May 19, 2017 4:09 pm

PeteyPablo wrote:I understand that the 3012HO is the preferred driver for the J12 lite but is there any reason to use the 3012LF-4 in order obtain a 4 ohm load with a single cabinet?
No reason at all to use the 3012lf-4. It is a subwoofer driver.
Stick with the drivers listed in the plans for the best results.
PeteyPablo wrote:I would like to use the J12 lite with an Aguilar Tonehammer 500 bass amp and maximize the 500 watt output. It seems that with the higher sensitivity the 8 ohm 3012HO should be louder than the 4 ohm 3012LF-4 even though it will receive half the wattage.
How did you work out it will receive half the watts?
500W is 500W.
Watts = Current x voltage.

Voltage = Current x resistance. If you change from an 8 ohm driver to a 4 ohm driver, then current has to increase. That means your amp has to work harder.

Tie all that together and this is what you get:
With 500W into 8 ohm load;
Voltage = 63V, Current = 7.9A.

With 500W into 4 ohm load;
Voltage = 45V, Current = 11A.

So, as you can see, you get higher voltage swing with less Amperage with an 8 ohm load.
Or put another way, your amp runs cooler...
Built:
DR 250: x 2 (melded array) with March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

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Bill Fitzmaurice
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Re: Kappalite 3012HO vs 3012LF-4

#4 Post by Bill Fitzmaurice » Fri May 19, 2017 4:12 pm

PeteyPablo wrote:is there any reason to use the 3012LF-4 in order obtain a 4 ohm load with a single cabinet?
No. It's a subwoofer driver.

PeteyPablo
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Re: Kappalite 3012HO vs 3012LF-4

#5 Post by PeteyPablo » Mon May 22, 2017 10:13 am

Thank you all. Much appreciated.

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