how to Implement a High Pass Filter in my setup


hi all , 
i would like to know what's the best way for me to limit full range signal going to my front speakers. 
and at the same time managing cross over on my two subs. 

in my setup where its source > Digital Coax > DAC > Pre Amp > Amp , i have read that this can be done with a high pass filter. 

i need the flexibility to be able to change the dAc or pre amp or amp depending on my future needs. 

the question i have are
should the cross over setting just be set on the subs themselves?
where does the sub plug into in this signal chain?
if using a high pass filter is the best solution - which one should i get ?


kearkg312
The left channel from the pre amp goes to the left sub and the left channel from HPF will go to the left channel of amp. The right channel from the pre amp goes to the right sub and the right channel from HPF will go to the right channel of amp. BTW, that wyred 4 sound sti500 does not have pre out and in. These are the instructions for the high pass filter!
https://hsuresearch.com/products/manual/HighPassFilterManual.pdf
i was reading the manual for the wyred 4 sound unit and it states this:

A loop in/out feature is also on hand with the STI-v2 integrated amplifiers. In the setup menu, you can select the loopfeature to insert a digital crossover or similar devices into the audio path. When the loop feature is activated, Input 5becomes loop in, and the AUX out becomes loop out.

When the Loop out feature is used, Aux out becomes the loop out which will feed the connected components input,and Input 5 will become the loop in which will come from the output of the connected component. Please note: theloop in connectors are directly connected to the internal amplifiers as if the unit was a standalone amp with 27db ofgain. The loop out is controlled by the volume control, but the loop in is not. Make sure you have all connectionsmade properly to ensure no damage is made to your equipment

 thought this meant that aux out and input 5 essentially become the pre out and main in ?