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Active line level crossover with subwoofer out - HELP

Hi.

Helping my friend with another challenge. 
Looking for a line level crossover. His preamp does not have a subwoofer out.

What he wants to do is have a high pass filter between the preamp and his power amp. This so his Spendor BC1’s are spared anything below 40 or 50hz. And, the crossover needs a low pass filter to spare the subwoofer the high frequencies. 
Thoughts? 
Thanks!
perkri
djones51
4,947 posts
 
This will do it  the first one has dirac the second link is a cheaper version that doesn't  but will let you set crossovers.

https://www.minidsp.com/products/dirac-series/ddrc-24

https://www.minidsp.com/products/minidsp-in-a-box/minidsp-2x4-hd
erik_squires
16,058 posts
 
The simple way is a miniDSP.
The complicated way is to put a capacitor in series with the amp, and send the full range to the sub, if the sub has a low pass, and most do, you just have to match the cap to the frequency and preamp input impedance.
Otherwise, a number of people make analog crossovers for consumers, but they are rare. Bryston comes to mind.
mike_in_nc
1,149 posts
 
Bryston
JL Audio
Marchand

Another possibility is a DAC-preamp with HP-LP crossover in it. They are made by Anthem, Legacy, DSPeaker, Trinnov, MiniDSP, Classe, and NAD, among others.

And as mentioned, a miniDSP unit is a path taken by many.
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