DIY FRFR cab; a question about tweeters?

[Gone_Shootin]

I've been looking into various FRFR options for my Helix. One of those have been this woofer/tweeter/crossover combo from Eminence:

Beta-12CX
http://www.eminence.com/speakers/speaker-detail/?model=Beta_12CX

ASD:1001
http://www.eminence.com/speakers/driver-detail/?model=ASD1001S

PXB2:2K5CX
http://www.eminence.com/speakers/crossover-detail/?model=PXB22k5cx

I've been considering using those in my 2x12s. But, in my research, I came across a statement that said two tweeters in the same enclosure cancel out some frequencies. But I see that Accu-Groove has cabs with two tweeters sitting right next to each other in the same cab.

I was just wondering if anybody could lend some clarity to the subject.

 

[dystrust]

Re: DIY FRFR cab; a question about tweeters?

I've been looking into various FRFR options for my Helix. But, in my research, I came across a statement that said two tweeters in the same enclosure cancel out some frequencies.

But I see that Accu-Groove has cabs with two tweeters sitting right next to each other in the same cab.

I was just wondering if anybody could lend some clarity to the subject.

Building a FRFR cabinet isn't simple; if you think you can just put those type of speakers in a guitar cab you're in for a lot of wasted time and headaches.

In order for a cabinet to truly be both full range and flat response (or as close as is feasible), it needs to be designed around the drivers used both in terms of specific cab dimensions and the location, size, and shape of any ports used. The same holds true for driver placement, so it *should* be possible to use two tweeters as long as the box dimensions are correct and all of the drivers are in the right place.

For a reasonably close example, take a look at the fEARful line of bass cabinets. They were designed to allow the LF driver to hit x-max without farting out and to be as flat as possible in the frequency range occupied by bass guitar. longcat has a 12/6 cube which combines an Eminence Kappalite 3012LF along with an Alpha 6 midrange; the horn-equipped examples can easily work as keyboard or small PA cabinets in a pinch.

 

[Jacew]

Re: DIY FRFR cab; a question about tweeters?

Building a FRFR cabinet isn't simple; if you think you can just put those type of speakers in a guitar cab you're in for a lot of wasted time and headaches.

In order for a cabinet to truly be both full range and flat response (or as close as is feasible), it needs to be designed around the drivers used both in terms of specific cab dimensions and the location, size, and shape of any ports used. The same holds true for driver placement, so it *should* be possible to use two tweeters as long as the box dimensions are correct and all of the drivers are in the right place.

For a reasonably close example, take a look at the fEARful line of bass cabinets. They were designed to allow the LF driver to hit x-max without farting out and to be as flat as possible in the frequency range occupied by bass guitar. longcat has a 12/6 cube which combines an Eminence Kappalite 3012LF along with an Alpha 6 midrange; the horn-equipped examples can easily work as keyboard or small PA cabinets in a pinch.

But in the end all that matters is that it sounds good. At least for Eminence, you can find recommended cabinet sizes for all their drivers,along with plenty of other info. That would be good place to start.

More than single driver in the same cabinet will make things more complicated. So I would suggest to make two 1x12 rather than 2x12.

 

[Gone_Shootin]

Re: DIY FRFR cab; a question about tweeters?

Thanks, and that's why I asked before buying. I found a thread over on the Fractal forum and one or two posted about this setup sounding better in old wedge monitor cabs they had laying around than they did in a square box. I don't know if the shape comes into play or not. But Eminence does recommend 0.95-2.5 cu.ft. for a sealed enclosure, and the 2x12 cabs I'm considering are 3.8 cu.ft. or 1.9 cu.ft. per speaker. And if I do try it, I'll be putting either some poly-fill in in there or will be lining the inside with fiberglass insulation. So far, that seems to be recommended quite a bit. I used to use poly-fill in my subwoofer cabs when I was into car stereos, but never considered it for stuff like this.

ETA: I forgot about this. Avatar makes a FRFR cab based on their Traditional diagonal 2x12. Roughly the cu.ft. comes out to a little over 3. They also use different speakers and it is ported, but still, it's based on an existing guitar cab. So it is possible. I just need to figure out the speakers first.

Linky: https://avatarspeakers.com/shop/guitar-cabinets/traditional/g212-traditional-frfr/

 

[Empty Pockets]

Re: DIY FRFR cab; a question about tweeters?

This is the kind of situation where it's probably wise to let a reputable company build your cab for you. Friedman and Line 6 make great cabs for your rig.

 

[Jacew]

Re: DIY FRFR cab; a question about tweeters?

With 2x12, to get in the ballpark in terms of tone with 1x12, does cab need to have less space per speaker than 1x12 would have?

Or can you just double the size and except roughly similar eq? Seem far too easy if that is the case...

 

[Gone_Shootin]

Re: DIY FRFR cab; a question about tweeters?

This is the kind of situation where it's probably wise to let a reputable company build your cab for you. Friedman and Line 6 make great cabs for your rig.

Yeah, but I tend to be a cheapskate if I can accomplish a similar result for alot less money. Even if I end up buying used empty wedge cabs, I'd still be at a lower price point than an Alto. Granted, they wouldn't be powered like an Alto, but I already have poweramps.