Selecting drivers for X12

Need to get my mind sortet on wich drivers i should get for a set of X12's.

I will take the Crescendo 12MB into consideration :)

But the RCF is my best bit so far i think.

And them i am thinking of getting a 2" driver on a small horn + a small bullit HF driver to take the last bit of HF.

My boxes aren't really X12's, I took the concept and started again.

Drivers are 18Sound 12ND710's (very very efficient drivers) and the HF is a P.Audio SD740N on an 18Sound XT1464 flare.

If you're using the cabs with subs, then the porting becomes less of an issue as you're not using as much of the port output.  You just need to tune the cab so that it gives a smooth response.  It often makes sense to set the cabinet tuning to be the same as the driver resonant frequency.

think ahead with the horn.. the space for the horn in the x12 plan is very small.. you'll probably end up with a bigger horn, therefore a bigger / taller box.. and so some adjustments to size anyway.. so you may as well rethink the tuning.

i also intend on getting into building similar boxes soon...

Nice drivers you use there Ceharden...

Edited by Crazy Dane - 20 July 2011 at 7:41pm

@ Rob:

The 12ND710's are silly money now .  However they are possibly still worth it because they weigh almost nothing, are very efficient, very smooth response and a very clean, accurate midrange.  Generally a win all round.

Note that if you're going to use drivers like the 12ND710 or 12MB700 then the one thing you won't get is a flat response at the low end.  Expect the response to start rolling off below around 200Hz and be easily 6dB down by 80-100Hz.  This is the trade-off of low end response against overall efficiency.

I decided that I was happy to loose out in this area.  By careful adjustment of the crossover to the subs and/or a gentle low shelf you can easily fill this area back in.  Or, in my case I don't bother because I mainly do live music and as you often end up putting a dip somewhere in the 100-200Hz region in a lot of instruments, having a natural dip saves me some effort!