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Speaker question: Peavy Max208

I bought a new Max 208 about 6 months ago to use as a stage monitor in a small outdoor venue where I play. Until this weekend, I was over the moon about it: I keep all the effects buttons 'off', put the gain and bass EQ at noon, the mid and high EQs at about 3:00, and the volume at around 6 (out of 10), and it cuts through the stage noises and I can hear and feel the bass perfectly when we play.

However, this weekend the bottom end seems to have dropped right out. It was after we played 'Dreams' with that pulsing low F/G on the E string, so I was wondering if I did something to the speaker. On another thread, someone mentioned a cabinet 'farting', and that's kind of what the low notes sound like...an indistinct blapping sound with a mix of overtones, when in the past it was just clear low notes, with a bit of a chest-vibrating boom to them. I am fairly sure it's now a blown cone, as I never pushed the volume very high and all the mid- and higher notes come out fine. It's just the deep notes have lost all punch.

My first step is going to be to remove the cover and tighten all the screws...that review mentioned how they seem to come from the factory about a full turn loose, and maybe one of the speakers is just rattling around in there. I'll also turn off the cabinet and listen to the house speakers (through the DI output) to ensure it is not something electronic. For now, I've just lowered the bass EQ down to about 3, but I cannot really hear the low notes at all when we play unless I crank up the volume to about 8, which it never required.

Any random thoughts about what it could be....especially from folks with a Max 208?
 
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Update:
I removed the faceplate and tweaked all the knobs and buttons on the amp and guitar, and I could replicate the sound...SORT of...when I had my bass on the split pickup, but it went away when I used the bridge pickup.

At this point, I'm going to assume it is either my neck pickup is starting to cause some sort of issue, or there was some sort of electromagnetic interference in the room (shielding the guitar is on my to-do list). Either that, or (because my amp sits right in the line of fire of the PA subwoofer) there is some sort of sound wave interference that is causing a breakdown in the low registers when the band is playing.

But I'm pretty sure it's not the amp.
 
Update:
I removed the faceplate and tweaked all the knobs and buttons on the amp and guitar, and I could replicate the sound...SORT of...when I had my bass on the split pickup, but it went away when I used the bridge pickup.

At this point, I'm going to assume it is either my neck pickup is starting to cause some sort of issue, or there was some sort of electromagnetic interference in the room (shielding the guitar is on my to-do list). Either that, or (because my amp sits right in the line of fire of the PA subwoofer) there is some sort of sound wave interference that is causing a breakdown in the low registers when the band is playing.

But I'm pretty sure it's not the amp.
try screwing down your pickup on the E side......Might clean up the notes.
 
I had one of these for a minute. My plan was to use it for upright bass. It sounded great until it didn't. What was happening with mine was the Peavey DDT compression/limiting circuit would engage if I pushed the low end to hard. Someone smarter than me can probably explain how it works. I believe it's a Peavey proprietary technology they bake in for protection. In a nutshell though it would drop all of the low end and get super mid-rangy.

It would return to normal if I cycled power on it. However I couldn't find any combination of input gain, EQ, or volume settings that made it useable for the gigs I play. If I was at decent volume levels and dug into a low E it would kick in every time.
 
Either that, or (because my amp sits right in the line of fire of the PA subwoofer) there is some sort of sound wave interference that is causing a breakdown in the low registers when the band is playing.
Ear fatigue is real. Your ears may have been in "protection mode" from being assaulted for a while.
Does not seem you duplicated it at home.
At this point, I'm going to assume it is either my neck pickup is starting to cause some sort of issue, or there was some sort of electromagnetic interference in the room (shielding the guitar is on my to-do list).
Is this an active Bass? Low battery can cause this.
If not, adjust the pickup.
 
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I agree with 👆🏼. If you’re using an active bass and it has a passive setting, give that try to see if it works better. If your notes and the bass drum are pretty much all that’s coming out if the subs, interaction with the subs probably isn’t the problem.
I occasionally have a problem with our keyboard player playing in my lower register and sometimes creates some fluttering of the notes. Hopefully you’re not dealing with that problem.
Last but not least two 8” drivers aren’t an ideal set-up to push low end so perhaps you have reached their limit or pushed them too hard.
I love the compact and narrow size if the Max 208. If the Max 210 would have been tall and narrow i would have bought it for my small weekly gig.
 
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