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fEARful Sub build advice

There are a variety of different documents, so it would be helpful if you showed the differences you are concerned about.

I downloaded the docs for the 12/6 Deluxe and the 12 Sub from Speaker Hardware. These are from the GIFs of the crossovers.

View attachment 5127122

The 2nd order low pass is the same on both.

Upon further review it appears i was mistaken..looking at the 3015lf & 3012lf crossovers!! Thank you for he clarification.
 
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So, essentially the "Sub" doesn't have "lower" freq. in these cases of comparison to the 12/6/1, just no top end freqs. to make it sound "lower"?
 

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Exactly. Plus the pair of fEarfuls together drops the load to 4 ohms, your Ampeg SVT grabs another gear.

The increased lower frequencies are balanced by increased mid when you switch out of the Lpad. Plus your tasteful eq on the amp.

Everybody likes more watts, right?

But here’s an interesting wrinkle. Check out a thread called, “ I ran my Streamliner at 16 ohm”. By running your pair of fEarfuls in series, the amp sees a 16 ohm load. You can push the amp harder with LESS volume. The Streamliner would get even more tube like gooeyness, without getting stupid loud. You have to build a series cable, but that’s a fun project in itself.

Check to see if the svt can do 16ohm.
 
But here’s an interesting wrinkle. Check out a thread called, “ I ran my Streamliner at 16 ohm”. By running your pair of fEarfuls in series, the amp sees a 16 ohm load. You can push the amp harder with LESS volume. The Streamliner would get even more tube like gooeyness, without getting stupid loud. You have to build a series cable, but that’s a fun project in itself.
Good point. Note that running a "sub" in series with a regular cab is likely to cause problems - the sub crossover will attenuate the output from the 6/1 drivers in the other cab. Another reason to just build a second cab same (more or less) as the first.

Incidentally, a sub intentionally has a larger footprint than its companion cab to reduce the likelihood of a stacked configuration toppling over.
 
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Exactly. Plus the pair of fEarfuls together drops the load to 4 ohms, your Ampeg SVT grabs another gear.

The increased lower frequencies are balanced by increased mid when you switch out of the Lpad. Plus your tasteful eq on the amp.

Everybody likes more watts, right?

But here’s an interesting wrinkle. Check out a thread called, “ I ran my Streamliner at 16 ohm”. By running your pair of fEarfuls in series, the amp sees a 16 ohm load. You can push the amp harder with LESS volume. The Streamliner would get even more tube like gooeyness, without getting stupid loud. You have to build a series cable, but that’s a fun project in itself.

Check to see if the svt can do 16ohm.[/Q

Power=some is good, more is better and too much is just right
 
Just like the 15/6/1 stack in the post above. One port is on the floor, the other at the top of the stack. Ideally, the top cab would be a mirror image of the bottom cab. Mids and horns line up.. sounds tricky, but basically all the changes involve the baffle and mid compartment.

I learned that the horns didn’t add much to my experience, they crossover around 6k. Not a lot of bass up there. I ran the horns off the GK 1001rb high circuit, which crosses at 5k, and could give me 50 watts, with the horn control on the amp. Cool, but not worth it for me to keep putting $100 per horn into a cab, plus the added complexity of the wiring.

On the 12/6 cube, I went with the inexpensive alpha 6 mid, and the CBG crossover. Super simple, robust and no lpads or switches. I liked this better than the 15/6/1. It just seemed to fit better with what I wanted to hear and carry. A smoother bass sound, where the 15/6/1 could be a bit harsh in the upper mids.
 
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