All the above assumes you are in coyote country and calling coyotes. Certain areas of OR have more cats than coyotes, I expect.
Bobcats in my experience will not generally come as far to the call nor nearly as fast as coyotes. High volume is not nearly as critical for my bobcat calling as high fidelity, for the squeaky sounds they prefer. On the other hand, thick cover can really swallow up sound and you may want all the volume you can pack.
You'll probably be amazed at how good coyote hearing is the first time you see one called from several hundred yards away with a lipsqueak or similar low-volume sound. I've also been about as astonished by having gray fox and bobcats walk right up on a speaker blaring full-volume.
LionHo
