2. amps-preamps
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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
kearkg312 OP
13 posts
 
i read about using a hsu high pass filter but i saw that needs two pre outs on your pre amp or you have to use a y adaptor. 
in my case i have two subs so im not sure if i need a preamp with 2 or 3 outputs or if i daisy chain one sub off the other and just use a y adaptor on the preamp. 
kearkg312 OP
13 posts
 
hi all after some further research on audiogon forum i have come across a solution that i like, i've re-pasted it here rather than typing it outmyself. 

from mkgus:

 the best way I have found to do this is to grab the signal off your main speaker amplifier binding posts, after it has passed through the amplifier. Drop the voltage to line level and run that through a dedicated subwoofer preamplifier.

i would like to ask what are some recommendations for new or used subwoofer pre amps that i can use?  i have two subwoofers that i need to connect. does this mean i need a pre amp with dual outputs or can i just use a y adaptor ?

and how do i get the signal of the main amplifier binding posts as it is already being used to run the main speakers with banana plugs. do i just insert bare wire from the voltage divider ?


erik_squires
15,640 posts
 
I'm absolutely not good with the idea of running the main speakers full range and grabbing the signal after the amp.  The benefits of limiting the output to the mains is too great.

Split the signal from the preamp, either using multiple outputs, which some preamps have, or a Y cable.

Put a capacitor right before the amp. You'll need to know the input impedance of your preamp and selected high pass frequency.  I suggest 80 Hz.


http://www.learningaboutelectronics.com/Articles/High-pass-filter-calculator.php#answer1
yogiboy's avatar
yogiboy
5,459 posts
 
My preamp only has single outputs so I use a pair of this y-adapter on my preamp to feed the high pass filter going to the subwoofer!
https://www.audioadvisor.com/prodinfo.asp?number=AQM22FHRD
This is the high pass filter that I have used!
https://www.hsuresearch.com/products/high-pass-filter.html
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