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fEARful part nine (9)

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#821
I was planning on making a fEarful style cab with the Cheap but good xover and the 18 sound mid. I would like to use the 3015 non lf and simply adjust the lpad on the 18 sound to compensate the db difference between the lf/non lf. Can this be done with good results or will I have to get a xover designed from scratch?

By the way, I want to use the non lf because I am going to install a switch that will let me bypass the mid and xover and use the 3015 as a low extending 1 way design!:hyper:
 
#822
I don't think anyone here is going to bless your idea of substituting the 3015 for the LF model. The LF driver is fulfilling the low-end portion of the cab and then the 18sound takes over for mids and such. The crossover was designed around this, and the speakers do not act the same as subwoofers.

The idea behind having a full-range single 15 and a 15/6 two way cabinet in one is cool, but disregards most of the intentions of the original design.
 
#823
BrianBOBO said:
I was planning on making a fEarful style cab with the Cheap but good xover and the 18 sound mid. I would like to use the 3015 non lf and simply adjust the lpad on the 18 sound to compensate the db difference between the lf/non lf. Can this be done with good results or will I have to get a xover designed from scratch?

By the way, I want to use the non lf because I am going to install a switch that will let me bypass the mid and xover and use the 3015 as a low extending 1 way design!:hyper:
Click to expand...

I must be reading this wrong because it makes no sense at all to me.......

1st of all, the cab is not optimized for a non LF. 2nd, if you want low extension, the LF is going to go way deeper than a non LF. 3rd, you lose all the power handling capabilities. 4th, the Lpad thing has been addressed before-dont use one. 5th, you've basically described a cab that isnt anything like a fEarful, so in reality a fEarful isnt what you want. Maybe you should consider some other cab option.
 
#824
Nope, not even close! I've run the 3015LF A/B'd against the 3015 and they are totally different animals. If you want to find out what a B string really sounds like, and have power to plumb the depths of low range, you need the LF.

Part of that experiment included running the two together at 4ohm, the 3015LF in the fEarful cab without the mid driver and the 3015 in a modified TL-606 cab. That combination was close to workable, but didn't sound as good as the 606/3015 alone. It was bottom heavy and scooped sounding.

The finished 15/6/1 put an end to messing around with combinations. It sounds better than anything I've hooked up so far. Adding the 606/3015 made things louder but not at all better.

These designs are pretty much tweeked to perfection. There might be a little wiggle room in the Lpad, but just a bit, to personal taste.
 
#825
OK let me clarify

1st of all, the cab is not optimized for a non LF.
I will modify cab design to suit the 3015

2nd, if you want low extension, the LF is going to go way deeper than a non LF.
The 3015 will extend to 60 hz easily and that is really all I need to pickup the 2nd harmonic and higher on the low B

3rd, you lose all the power handling capabilities.
I will be pushing this with a LMII 300 watts at 8 ohm

4th, the Lpad thing has been addressed before-dont use one.
??? l pads are on almost all of the cheap but good crossovers. you must use one unless your drivers SPL match up perfectly

5th, you've basically described a cab that isnt anything like a fEarful, so in reality a fEarful isnt what you want. Maybe you should consider some other cab option.
Your right, I want a nEarful. It will accomplish similar goals as the fEarful but give me higher sensitivity, a smaller package, and an option 1 way 15 if I choose.

So now that that is out of the way, back to the original question. Can I modify the Lpad and box only, or do I need a different xover all together (ie. will the CBG xover work ok with a 3015 nonlf?
 
#827
BrianBOBO said:
So now that that is out of the way, back to the original question. Can I modify the Lpad and box only, or do I need a different xover all together (ie. will the CBG xover work ok with a 3015 nonlf?
Click to expand...

Bottom line: for best results you will need to do a complete design yourself, and probably in your own thread. If you don't care about getting the best results you can just throw whatever driver and crossover in whatever box, same as it ever was. In any case, this is a case of fArful, not nEarful, with all due respect. Best of luck, I actually like the idea. ;)
 
#830
Thanks for the replies all. I'll have to look into designing my own crossover for this job then. I'm really stoked about having a cab that can pull off 2 differnt styles and give me vesitility. Plus, I just think it would be fun as hell to design and build.
 
#832
BrianBOBO said:
Thanks for the replies all. I'll have to look into designing my own crossover for this job then. I'm really stoked about having a cab that can pull off 2 differnt styles and give me vesitility. Plus, I just think it would be fun as hell to design and build.
Click to expand...

You can find lots of links in the fEarful Wiki to what you'll need to design a decent crossover. You should be up to speed in a few hundred hours or so if you're technically inclined. ;)
 
#834
RobinC said:
Can someone please clarify for me what a L-pad is and what it is supposed to do? I'm new at this x-over stuff:smug:
Click to expand...

It's a resistive network that adjusts the level of a louder driver to match that of a less loud one. It can be variable (with a knob or switch) or fixed. There are other padding networks too, such as T and Pi. Get to work in the Wiki...:cool:
 
#835
Passinwind said:
It's a resistive network that adjusts the level of a louder driver to match that of a less loud one. It can be variable (with a knob or switch) or fixed. There are other padding networks too, such as T and Pi. Get to work in the Wiki...:cool:
Click to expand...

So am I close to the mark in thinking that a variable one basically functions as a volume control for the tweeter in the case of fEarful cabs?
 
#836
RobinC said:
So am I close to the mark in thinking that a variable one basically functions as a volume control for the tweeter in the case of fEarful cabs?
Click to expand...

Right. In the upper frequency ranges a variable L-pad doesn't mess things up too awfully badly. In the midrange region it can unless it is very carefully implemented.
 
#837
VARIABLE L-pads (often called variable attenuators) SUCK for midrange. There's a page telling why on the fEARful website. There are also some deets on FIXED L-pads there on the fEARful website in the crossover section, on the greenboy designs page. One merely needs to follow the links, and realize that they are just the tip of the iceberg, though the text on the site may seem like a fair amount at first.

Further down the main page, are a few links that also pertain to crossovers.
 
#838
greenboy said:
VARIABLE L-pads (often called variable attenuators) SUCK for midrange. There's a page telling why on the fEARful website. There are also some deets on FIXED L-pads there on the fEARful website in the crossover section, on the greenboy designs page. One merely needs to follow the links, and realize that they are just the tip of the iceberg, though the text on the site may seem like a fair amount at first.

Further down the main page, are a few links that also pertain to crossovers.
Click to expand...

I would tell you, but these days my memory is pretty lossy.
 
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