dpm2340 and kalali, I've tried passives before and always found that they tended to "thin" the sound and lacked power and punch/prat. Not anymore! I highly recommend the Tortuga passives. They come in several flavors ranging from the LDR1 (one single ended input, 2 single ended outputs) to the LDR1B (same, but balanced) up to the LDR3 and LDRxB (3 SE inputs, 3 SE outputs) and LDRxB (same but balanced plus one SE input and output). Prices range from $995 to $2850. I'm using an all balanced system with the LDRxB for my main controller in a biamped system. One output feeds the M/T amps and the other goes to the bass amp first goes through the LDR1B and from there to the bass amps.
These things will change your opinion of passives. I could get into details, but one great feature is that you can set the input impedance anywhere from 1k to 99kohms (SE) or 2k to 198kohms (balanced). You can save up to 5 settings and switch between them on the fly. I've found fine tuning input impedance to be indispensable to get the best sound from your source(s). It also makes it possible to use two passive controllers in my system by allowing me to find the optimum impedance settings.
One last thing, if you have a balanced system, you can request that the LDRxB include absolute phase control from the remote. This feature adds no signal degrading circuitry or switches and is also something I would not want to be without, now that I hear how important that feature is.
The control software allows you to recalibrate the LDR's response anytime you want, so LDR drift is a non issue. Last thing, go for the battery power supply, it's well worth the cost.
Best, Robert
