fEARful™ Part Eleven (11)

[Coolhandjjl]

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this calls for (4) 1/2 inch pieces book cased.. Does the forth go to the baffle, top, or bottom?

How about each of the four interior sides? Top, bottom, left, right?

 

[knucklehead G]

Depends on if you want a crossover or not.

IMHO, for most people, the 800RB with the built in crossover would be a great way to save a good bit of time and money and get a really cool flexible sound. I know Foz has tried that.

Would you still need a crossover for the 100W high section, to split between the 6 and the horn? It is entirely possible that I don't know what I'm talking about.

 

[rpsands]

Yes, you would, if you have a horn.

 

[PhiDeck]

Would you still need a crossover for the 100W high section, to split between the 6 and the horn? It is entirely possible that I don't know what I'm talking about.

Yes, if bi-amping you still need a crossover between the midrange and the tweeter. However, because the crossover frequency is greater, the inductors are smaller and lighter than in the omitted crossover.

 

[knucklehead G]

Is there a way to make the 15 4-ohms so it can take the full 300W off the low section? The 3015lf says 8-ohms.

 

[cableguy]

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this calls for (4) 1/2 inch pieces book cased.. Does the forth go to the baffle, top, or bottom?

The plan I saw (and did) just called for (1) 7.25' X 3.5" X 2" block on the side of the chamber. But I also just saw the other plan for (4) pieces bookended. Mine sounds good so I hope it's right. Most likely I think either would work and it's just a matter of taking up space.

 

[rpsands]

Is there a way to make the 15 4-ohms so it can take the full 300W off the low section? The 3015lf says 8-ohms.

No.

 

[Bill Whitehurst]

Knuklehead,
The way you do that, is to add a 15 sub.
You know ya wanna!

 

[Sundogue]

Most every fEARful question can be answered here...

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Anything else can be elaborated on here...

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[singlemalt]

Knucklehead, the GK 800 rb is the odd bird in the GK lineup. It is the only head with the variable crossover and uses a different setup for the high/low power sections. The online manual leaves you in the dark on this stuff, at least the manual I saw did.

So, yeah, theoretically you could use the 800rb to power the 15/6 and skip the CBG crossover part of the build. Hopefully somebody who has done it will chime in. The downside I see with skipping the beefy CBG crossover, is that the cab is now limited to your one amp, the 800 rb. The crossover isn't that big a deal to build.

The Gk 1001 rb 2 does a great job with the 15/6/1 I have. 450 watts to the 8 ohm cab, 3015LF and 18sound 6nd410, and the 50 watt high section runs the horn, completely isolated from the rest of the cab. Add a 1-15 sub and you drop the whole thing to 4 ohms for even more power. Truth be told you could probably skip the horn, the Gk only puts 5K and up into it, and there is plenty of high coming off the 18sound. The 1001 has a more flexible eq as well.

Once you add a sub, the horn starts to play a bigger part, but the 18sound still puts out enough to handle the two 3015LFs.

If you don't already own a 800 rb, I'd say build the 15/6 or 15/6/1 with the CBG crossover and take cab amp shopping. There's plenty of amp choices.

 

[Coolhandjjl]

Knuklehead,
The way you do that, is to add a 15 sub.
You know ya wanna!

You would be so wattage limited with only 300 watts driving two 3015LF's it would not be worth the expense to make the two. In the real world, you're only turning up that amp 2/3 maybe? You need the rest for headroom. Some folks are using a bridged stereo amp sending over 900 watts to a that full stack.

 

[rpsands]

You would be so wattage limited with only 300 watts driving two 3015LF's it would not be worth the expense to make the two. In the real world, you're only turning up that amp 2/3 maybe? You need the rest for headroom. Some folks are using a bridged stereo amp sending over 900 watts to a that full stack.

So? The fast majority of the amps I've used have had 300w @ 8 ohms or thereabouts and I have had no problems being loud enough.

If you like the tone and flexibility of the 800 rb then the only way to make it louder is to add more speakers.

There are a lot of reasons to use the fEarful other than power handling -- low end extension is great, decreasing the power amplifier power you need to get big lows, and the midrange transition and dispersion are excellent.

 

[lbwdog]

So? The fast majority of the amps I've used have had 300w @ 8 ohms or thereabouts and I have had no problems being loud enough.

If you like the tone and flexibility of the 800 rb then the only way to make it louder is to add more speakers.

There are a lot of reasons to use the fEarful other than power handling -- low end extension is great, decreasing the power amplifier power you need to get big lows, and the midrange transition and dispersion are excellent.

+1
I have played on big stages, at large arenas, with major artists, using fifteen piece bands, with one 800RB. Plenty loud!!

Those 300 G-K watts have always seemed as loud as some other's 800 watts........Go figure.

 

[Nightlyraider]

You would be so wattage limited with only 300 watts driving two 3015LF's it would not be worth the expense to make the two. In the real world, you're only turning up that amp 2/3 maybe? You need the rest for headroom. Some folks are using a bridged stereo amp sending over 900 watts to a that full stack.

Waaaaay too many posts along this line. Why must the solution be pump super huge wattage into a single cab when you can use two very efficient cabinets and any amp of your choosing?

Two 15/6 fearfuls with my Bass 400+ (maybe good for ~250 "watts") and there is THUNDER. The GK wouldn't be able to fully exercise the cabinets, but it sure would get them loud enough to play for anything indoors save an arena.

 

[BurningSkies]

I can report that running 2 fearful cabs with ~250w each can be hugely loud.

 

[dug dog]

Why must the solution be pump super huge wattage into a single cab when you can use two very efficient cabinets and any amp of your choosing?

Pack space and schlep factor are pretty good reasons, IMHO.

 

[rpsands]

Pack space and schlep factor are pretty good reasons, IMHO.

I only ever use one 15/6 so I am with you -- but it doesn't take uber wattage to power the 15/6. Got to break people of that idea.

It might not be enough for everyone but it'll be waaaay louder than you'd expect.

 

[dug dog]

it doesn't take uber wattage to power the 15/6. Got to break people of that idea.

Couldn't agree more.

In my case, I'm hoping that my soon to be completed 12/6 with my Carvin BX1500 will be all the rig I'll ever need to carry.

 

[dug dog]

I also own a 15/6...

 

[knucklehead G]

I was playing with the SketchUp models on greenboy's website and came up with this.. The original box is unchanged as I just built on top of it, and I think with the inside of the bottom port slots and top "port" slots painted black, it wouldn't look odd from the audience.

1515+66, undo a few latches, flip the top, poof, 1001RB, or whatever you want. There's plenty of room for a 2U head and the ports are the same size on top and bottom of the cab. You'd also have room for cables or whatever.

Just an idea. More complex than just doing an airhead cab, but more stylish IMHO.