ketansethi1987
Active Member
I don't think any sub alters the frequencies being sent from the RCA outs. Usually in all subs RCA in and out are just a parallel connection. The low pass filter of the sub has nothing to do with the RCA out sockets. So in either case the speakers will play full frequencies unless they have an active crossover inbuilt.The speakers should not play full range if the sub has a crossover/high pass.
Yes it needs to have input as well as output. The type varies from sub to sub. Using the Edifier T5 as an example. A consumer sub. Your source/dac is connected via the RCA input. You set the frequency for the crossover. For example 80hz. So frequencies below 80 Hz is handled by the sub and those above are passed onto the Line Out which you connect your active speakers. They will play the frequencies above 80hz.
This is a simple explanation of what it's supposed to do.