Electronic cross-over on pre-amp out, to split signal to subwoofer and bookshelf speakers

Here ya go!

https://hsuresearch.com/collections/accessories/products/high-pass-filter

This is very good feedback.

Let me share a bit more.

My power amps are Nagra VPA 50 W.  My speakers are Tidal Audio Amea (85/86 dB).

Both amps and speakers are excellent.  I am trying to reduce the load on the speakers, to have more power available for the midrange and tweeters. 50 W is not really sufficient to drive the speakers, and I am trying to have to avoid to buy either new amps or speakers.  Make the best of what I have. 😊

So a "High Pass" filter makes a lot of sense.  Install a Y connection on pre-amp out to feed the single sub-woofer. Use the second phono out on the preamp to a High Pass Filter that will feed the Power amps.

Please let me more regarding what you have learned in doing this.  Love folks sharing the brand of “high pass filter” they have installed successfully.  Any concerns?  Does this impact the pre-amp load positively or negatively???   Thank you!!!

I built my own 80 Hz (second order) high pass filters from a few high-quality components.

DM me if you want the schematics and parts list. (My version is a bit complicated because I have a balanced connection between my preamp and my power amps but it can be simplified if you use single ended connections, essentially using only half the number of parts.)

My preamp has two outputs so I use one to go to the high pass filter and then on to the power amps (I happen to have two monoblocks) and the other output to the subwoofer (which obviously has a adjustable low pass filter already built in).

I guess you take some load off the power amp, but most importantly you are not forcing your main speakers to deal with frequencies below 80 Hz, where most main speaker drivers don’t shine.

I personally think this is a great way to "bi amp," by using the regular power amp (or amps) for the mid-bass and up, and using the built-in sub amplifier for the bass below 80 Hz (+/-).

Check out Sublime Acoustic. They make two different levels of crossover unit, the K231 and the K235. Lovingly crafted in Northern California.

The one issue that some people complain about is that to change the crossover point, you need a small card they provide, with precision trimmed resistors on it. A different card for each frequency. You get two with the purchase, and the rest are just $10 each. 

I have a set from 50 Hz to 80 Hz in 5 Hz increments. They are easy to change out, and crossover points are not something you want to A/B quickly, anyway; you need to listen a while with each choice in the system. I really don’t find the slow change-out to be an issue.

I find the units to be very reliable and transparent.

JL audio CR1. The best. Check out the reviews.