0 Members and 1 Guest are viewing this topic. Read 5775 times.
This camp is intriguing... hadn't heard of this before. Are any of the better known crossover guru's working in this arena? Are there any successful products on the market? Does it need to be tailored specifically for the speakers (like typical passives are)? Again, this is pretty interesting...
Agreed doug, that I would lean towards the non variable points. But slopes are not variable AFAIK. I think getting a cheap pro xo that is very flexible to experiment and then commit to a high end solution like marchand would be a better idea. Maybe an even better idea is to design the passive line level xo we were talking about, but that is not without it's downsides as well.
Well lets be fair, the 24db/octave slope keeps the signal in phase *only* near the xo point and not wideband. Meaning the 24db/octave slope has, to the best of my knowledge, a larger impact on overall wideband phase then say a 6db/octave slope. There are more schools of thought out there than just BC of VMPS that believe that anything above 12db/octave slope causes phase errors too great to provide seemless driver integration (outside of the xo point) and coherent sound. I am in no camp here just stating ...
You are probably right doug, that active xo probably is far less harmful to phase at steep slopes but AFAIK I think it still does have the impact still. I think I am going to try playing with a digital xo setup at some point in the near future, maybe not with my RM40's but probably with my own contraption.
I just don't see how doing it line level instead of speaker level is going to get around the problem is all. You could be right but it doesn't seem obvious to me.
I tried the lowpass for the woofers at 200Hz as Brian recommended, but it sounded too bright and thin. The serial first order coil Brian uses slopes up to 600 Hz. So, I tried 200, 300, 400, 500, 600 and 700 (all 24dB) and settled on 600. I don't hear any cancelation. Rather the woofers add that woomp to the voices that makes Johnny Cash sound like Johnny Cash. It also provides that huskiness to Natalie Merchant and warmth to Norah Jones that makes them special. On operatic music, I hear the voices thro ...