Sub Woofer for Golden Ear Technolgy Triton 5


Just received delivery of the Golden Ear technology loudspeaker.
Wish they had a little more bottom end.
Can anybody recommend a sub that would blend with them?
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Why not purchase a Triton series speaker with the built in powered subwoofers?  The 3+ comes to mind.  It is the best way to do it as the bass to treble is seamless.
Depends on budget, and whether you want sealed or ported (expensive ported subs are very musical, even 18” ones). What are is your preamp/integrated/receiver?