Hi Ozzy,
No problem at all in your situation. My statement about the capacitance of the cable to the sub affecting the signal to the main power amp applies only to the situation where either a y-adapter is used off of a single output of the preamp, or the two cables are connected to two output jacks on the preamp that are connected together internally within the preamp.
The XP10, as you indicated, has separate buffers for the xlr and rca outputs, which means that there are separate driver stages for each set of outputs. That eliminates the possibility of interaction of the sub cable with the signal to the main power amp.
Also, I note that the XP10 has an output impedance of 200 ohms unbalanced, and 1000 ohms on each leg of the balanced output. While the 1000 ohms is somewhat high, that is still most likely low enough to avoid perceivable treble rolloff for a cable length of 10 feet. If the cable capacitance is EXTREMELY high, say 150 picofarads (pf) per foot, you might get an attenuation at 20kHz in the vicinity of 1db, which I think would be imperceptible to just about all of us. For more typical cable capacitances, there would be no effect whatsoever.
The 20 foot length to the sub benefits from the lower 200 ohm unbalanced output impedance, and upper treble rolloff doesn't matter anyway on the signal to the sub. So you are doubly ok there.
Bottom line: No problem!
Regards,
-- Al
No problem at all in your situation. My statement about the capacitance of the cable to the sub affecting the signal to the main power amp applies only to the situation where either a y-adapter is used off of a single output of the preamp, or the two cables are connected to two output jacks on the preamp that are connected together internally within the preamp.
The XP10, as you indicated, has separate buffers for the xlr and rca outputs, which means that there are separate driver stages for each set of outputs. That eliminates the possibility of interaction of the sub cable with the signal to the main power amp.
Also, I note that the XP10 has an output impedance of 200 ohms unbalanced, and 1000 ohms on each leg of the balanced output. While the 1000 ohms is somewhat high, that is still most likely low enough to avoid perceivable treble rolloff for a cable length of 10 feet. If the cable capacitance is EXTREMELY high, say 150 picofarads (pf) per foot, you might get an attenuation at 20kHz in the vicinity of 1db, which I think would be imperceptible to just about all of us. For more typical cable capacitances, there would be no effect whatsoever.
The 20 foot length to the sub benefits from the lower 200 ohm unbalanced output impedance, and upper treble rolloff doesn't matter anyway on the signal to the sub. So you are doubly ok there.
Bottom line: No problem!
Regards,
-- Al