Did one of my horns die?

I have been running my Hornblasters Conductor’s Special Model 540 Train Horn Kit for almost a year now. Lately, my horns sound like they are a bit higher pitched than I remember then being when new. They used to have a slightly deeper kick you in the chest tone. They are still f’ing loud, just not quite as deep sounding. Do I have a sick horn or are they just broken in? It is not very train horn-ish right now, just really f’ing loud air horn-ish.

hay bro i have a
S4 kit my self
and i am having
sum problums to
mine dont sound
rite eather i run
175psi did you
check the inside
of the horns to see
if they are derty?

No, the way I have them mounted, I would have to use a mirror and flashlight to see into the horns. I am thinking about taking the mounting plate down and testing each horn.

thats ok bro i know
how it is i have
mine mounted
on a custom bar
and the dam nuts
rusted so i wuss
gona clean them to
day but it rain so
ill clean mine sum
time till then hope
it all works out
for ya.
peace