Avantgarde Duo XD. The XD software included in the bass unit's amp allows comprehensive frequency level adjustment, plus all sorts of other options such as the type of crossover and slope - Bessel, Butterworth. etc. Therefore the main amp (with DSP off) can provide its best signal to the mid and top horns and leave the bass amp to adjust low frequencies only.
The alternative is to bi-amp conventional speakers where the bass and top have their own terminals. The amp for the top should have DSP off and the bass amp could have it on.
I've tried amps with RoomPerfect, Dirac Live and MARS and all adversely affect the top end that produces the sense of live and exciting music. Turning on any of these built-in DSPs removes some of this excitement. Probably not noticeable with fairly basic speakers but a clear difference with speakers such as Avantgarde. Peter
PS this forum is full of RoomPerfect addicts who will deny that RP has any detrimental effect, but I found the Lyngdorf 3400's DSP was decidedly worse at the top end than Dirac Live. It sucks out more life from the music than DL or MARS. That's the system used in the latest Micromega amps. Lyngdorf is best kept for audio visual systems where the quality of sound is less noticed, because the brain is also dealing with its visual input and that takes priority over audio.
This must be about the 40th time i have read posts from you HH, saying that you have lucked out with DSP, and that you dont like the results that they have given you. Everyone has been very patient with you. With Dirac Live in particular, they suggest you refollow the instructions to the letter when making sound measurements, in case you have missed a step or decided that you know best at some stage in the process.
I would add an extra vital step in this process. That would be to wait a month before switching DL off as your brain needs time to get used to the sound of the system, not only without room boom but also with readjusted timings for your speakers and room listening positions. This takes alot of time and patience on your part, i know, but its worth it to find as most folks do with a good amp, eg nad m33, that the top end is greatly improved from a high-fidelity perspective.
Can i suggest that any top end ‘excitement’ or ‘liveliness’ that you believe to have disappeared might in reality have not been a part of the recording but part of your dodgy room/system combo and that DL has for the first time allowed you to hear your recordings accurately for the first time. And you dont like it cos you’re not used to it?
Some ‘unexciting’ and ‘unlively’ singers often use reverb to help improve the audiences experience of their shows. In some sense are you a fan of the analogous reverb to be found within your room and system?
I ask these questions of you as you are patently swimming against the tide with so many people finding Dirac Live, esp. with their NAD M33, a revelation ito timing pace rhythm imaging.
Good luck though in gaining peace with this project HH as it must be driving you nuts that you haven’t made the most of your investments in both time and money.