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.