I have been using a 12 volt gel cell battery on my Foxpro's with two speakers since 2008. My callers are very loud. On every stand I make I will reach full blast volume 40.
On some of the sounds that are not very loud I will play them on volume 40 the entire time I use that sound. After calling for 6 to 8 minutes I will go to a loud Jack Rabbit sound and play it on full blast for about a minute and then turn it down. Many times I have a coyote or coyotes show up within 4 to 5 minutes after playing a loud sound on full blast.
Every time I use coyote vocals it is on full volume 40.
In country with hills, mountains and canyons the coyotes are not always in a perfect spot to hear your sounds. Many times I have driven my vehicle right up to within 100 yards of coyotes, deer and elk and they didn't hear my vehicle. It may have been because the wind or breeze was blowing from them towards my vehicle.
I call against the wind or breeze 95% of the time and that maybe why high volume has worked for me using it sometime during every stand I make.
If you use full volume for just 30 seconds to a minute or use Pup Distress 3 at the end of your stand on full blast your sounds will be heard by more coyotes over the long run.
Quite a few years ago 3 of Foxpro's most popular sounds were some of the loudest sounds Foxpro had at that time.
