This is the @Fishman_Music Blackstack magnetic soundhole pickup

Other Uses For Your Acoustic Guitar Soundhole Cover!

Martin Custom D-28 Walnut - Large Soundhole Cannon!!

Using a feedback suppressor for quiet practicing!

This is Fishman's BEST Acoustic Soundhole Pickup!

Eastman Made A Large Soundhole Dread! "Home From The Forest" Gordon Lightfoot - Tony Rice Cover

Passive Magnetic Soundhole Pickup Comparison FISHMAN | MOJOTONE | K&K Double Helix Acoustic Pickups