Good to hear this.
Please can you tell us what is most important for a sucessful implementation.
Also, how to connect the synth to the source if we still want to use our own DAC ?
thanks in advance
There are two SPDIF optical outputs that pass through the processed signal to your DAC.
To be honest, the measurements are by far the most important.
Ideally, you have (or you have temporary access to) a terrific-sounding speaker setup in an acoustically treated room (it's going to "copy" everything, including acousting 'problems', if there are any). And with the Realiser you can "copy" that sound with the help of microphones placed in your ears.
Measurement 1 is measuring speakers from the listening position, and then it will "blend in" with the sound of your headphone system measurement 2 taken with the headphones on from the same spot, microphones still in place - and you can verify / fine-tune the matching of the two. The Realiser basically compiles the two measurements (with real-time compensation with the head-tracking to ensure the virtual speakers stay in fixed positions) to ensure you are hearing measurement 1 with your headphones.
So in the end, it will keep some attributes of the headphones themselves but it will sound like the speakers you measure.
To stay on topic, using an SR-009 is beneficial, but a BHSE is probably overkill for this (especially if you intend to change the tubes from time to time), and a KGSSHV or similar solid-state amp is more than enough.
Since you can take measurements in multiple positions, you can create virtual speakers even from stereo setups.
And of course you can try other virtual rooms which other people measured and shared to "couple" with your own headphone listening measurements, but it won't be the same, it's a case of try and see if it works.