I was of course talking about the headphone outputs in the front. I plan to build a 3 way system(sealed) i will not need a lowpass filter for the woofers, i will ad subwoofers later if i view it as necessary.
I would use the raal 140-15d so i cannot go for digital XO only.
It seams the adi-2 pro isn't suitable for tge subwoofers and thus i will have to use something else for that in the future. I will wait until i have started building speakers until i get a dac, maybe something better will come.
I don't see why the Raal tweeter would not work with a digital crossover?
Your chain would be source -> preamp -> crossover -> 3 x amplifier -> woofer, mid, tweeter (fed from each amp)
There are many possibilities. One decision to make is wether you want a digital, or an analog crossover. Both will work.
As I described earlier, a DSP-enabled amplifier would also work. You could do it with three... or just one for the woofers, and a digital or analog or even passive cross-over with amp(s) for the mid/hi.
Or get a digital crossover, and do everything there.
As you can see, the possibilities are endless, which makes it difficult to decide!
There are a few things to consider though:
- If you use a digital crossover, I would suggest to "feed" it digitally. Otherwise you will have a double conversion for your digital sources.
- Not all DSP software is created equal. I highly recommend testing the crossover software before purchasing a digital crossover. Most of the programs can be used without a connection to the actual device (e.g. you don't need to buy the crossover just for testing the software). I have tried quite a few, from unusable to very nice...
- Digital crossovers are much more flexible than analog ones
- Some say analog crossovers sound better, having no (A/)D/A conversion; you need to test and decide for yourself whether you can hear differences...
If you want to go analog, you will have a hard time finding a quality analog crossover. Well, at least if your budget is limited. If you don't want to "DIY", then I would suggest checking out the offerings from Marchand Electronics. These are highly regarded by many.
I would also suggest to pursue another forum for more help, as this is not really RME specific. Personally, I prefer DIYAudio.com, where people are rather rational, and not blinded by marketing or "ultra-high-end" claims...
Nevertheless, you should not rule out the ADI-2 Pro. It would make a really great pre-amp for your active system. The many great features (variable loudness, EQ, 2 separate headphone outputs, bass/treble adjustments, great variety of inputs, nice display, proper volume control knob...) are at your fingertips. In my opinion, a very sweet pre-amp solution for an active system.
To make a long story short: I did buy the ADI-2 Pro to be used as a pre-amp in my active system