2x10 DIY cabinet, help needed!

[billfitzmaurice]

For a bass speaker, I doubt the difference is going to be drastic.

Au contraire. The crossover frequency is entirely dependant on the driver impedance. A nominal 8 ohm woofer might exhibit an actual impedance of 8 ohms at 500 Hz, 12 ohms at 2 kHz and 16 ohms at 4kHz. This can throw off the resulting crossover frequency by a half-octave or more. One way to get around that problem is to use an impedance flattener (zobel) but the better method is to use the component values dictated by the actual impedance at the crossover frequency.
To the OP, the reason I suggested using an existing design that has been tested and proven to work is just that: it's been tested and proven to work. On the face of it designing a speaker from scratch seems a simple enough proposition, but that's quite far from the reality of the situation.

 

[Mixi]

Maybe it would have been more sensible to use existed desing, but I've all ready started to build the cabinet (when I was going to do 2x10) and I'd really like to try design something by myself and see how it sounds. It doesn't need to be perfect. Somehow I think that at least the cheaper bass cabs aren't designed very well and people still use them.
This is going to be my first one and if it sounds any good I'll probably make a better one in the future.

I read the whole article "design of passive crossovers" through and now I actually understand what you guys mean.

I got an new idea. At this point it seems to be too hard for me to make my own crossover. So I thought that I could use eminence's stock crossover and modify it a bit. Maybe using zobels before the crossover for Bass and mid speaker? (does the tweeter need one too?). I know that they reduce the overal impedance and uses a bit power, but I would use the cabinet probably with powerful solid state amp so it wouldn't be that bad. Could also add L-pad for tweeter and then I got maybe a bit stupid idea that could I use L-pad for the bass and mid speakers as well?
Still somehow I feel like that the eminence's stock crossovers might already use zobels because they are made for variable speaker combinations. I'd probably need to write eminence... U guys don't know?

Would it still be just easier to make a 2-way system with stock eminence crossover which already has L-pad? Would it be less risky than a 3-way system?

Thanks
Mikko

 

[fdeck]

Au contraire. The crossover frequency is entirely dependant on the driver impedance.

Brain fart. Of course you're right.

By the way, www.madisound.com offers to design custom crossovers.

 

[Rick Auricchio]

Still somehow I feel like that the eminence's stock crossovers might already use zobels because they are made for variable speaker combinations.

A zobel's purpose is to compensate for the driver inductance, its L(e) value. No stock crossover can anticipate your choice of driver.

The good news: You're asking a lot of sensible questions. The bad news: You have already begun building a cabinet without getting all the answers. As a result, you will spend lots of time redesigning and rebuilding your cabinet. That's how they did things thirty years ago. With today's software, most of this work can be avoided.

 

[spode master]

Yes If your determined to use the box you already built. Its going to be more work finding a suitable driver, than if you designed a box for a specific driver.