Behringer cx3400 crossover

I have bi-amped 3-way speakers, crossed with the cx3400. I use the behringer only as a 2-way crossover @ 300 hz. Can I use the low-sum fuction to add an active subwoofer? I don't want to send the complete low-freq signal that now goes to the woofers to the sub in mono, but rather add the sub to take over only the lowest bass. The manual didn't help me any further...
 
keyser said:
I have bi-amped 3-way speakers, crossed with the cx3400. I use the behringer only as a 2-way crossover @ 300 hz. Can I use the low-sum fuction to add an active subwoofer? I don't want to send the complete low-freq signal that now goes to the woofers to the sub in mono, but rather add the sub to take over only the lowest bass. The manual didn't help me any further...


Are you using RCA inputs? If so, are you just using a regular RCA adapter or are you using something special? I'm considering this xover again the DCX2496... I'm not sure if I actually need all of the DCX features.