Adding Subs. My observation.

[Chienmortbb]

I bought some speakers from @Phil Starr about a year ago, Two Wharfedale Titan 12" Active tops plus two JBL 15" powered subs. I have used the Wharfedale Titans before on their own but wanted to try them with the subs. The subs have a built-in LPF/HPF, but I still set the mixer output with an LPF/HPF centred on 100 hertz and fed the tops with an HPF with -3db at 100Hz.
 

When I switched the system on, there seemed to be little bass but inverting the sub signals brought in the low end. I was surprised by two things. Firstly, the sound was so much fuller but secondly, the increased low end seemed to be coming from the tops. The overall sound seemed much louder.

 

I had the subs together in the centre and used a selection of music recorded before they started compressing the heck out of recordings. The final test was to remove the HPF/LPF from the subs and rely on the internal filters. I could not really hear any difference between the internal filters and the one in the digital mixer.