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PostPosted: Fri May 19, 2017 2:57 pm 
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Joined: Thu Mar 09, 2017 9:09 pm
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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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PostPosted: Fri May 19, 2017 3:25 pm 
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Joined: Mon Aug 14, 2006 5:08 am
Posts: 5288
Location: Warren, MI
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


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PostPosted: Fri May 19, 2017 4:09 pm 
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Joined: Mon Nov 28, 2011 11:12 am
Posts: 5495
Location: Ilfracombe Queensland Australia
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:
2 x DR 250 (melded array) with March 2012 plans.
4 x 20" BP102 T39's, 2 x 28" 3012lf loaded underway.
3 x WH8 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...


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PostPosted: Fri May 19, 2017 4:12 pm 
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Joined: Tue May 02, 2006 5:59 pm
Posts: 25442
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.


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PostPosted: Mon May 22, 2017 10:13 am 
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Joined: Thu Mar 09, 2017 9:09 pm
Posts: 3
Thank you all. Much appreciated.


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