Wow. Such an abundance of information, it's almost overwhelming, in the best way possible.
Thanks folks...I'll try to address the responses that need addressing.
I’m skeptical that there is something wrong with the amp, but it probably would be worthwhile to take it to an amp tech just for peace of mind.
I may try to have him take the amp in to be looked at, as you said, just in case. Though, at 500W, perhaps it might be worth him getting something beefier anyway?
Edit: A regular PA amp would do a better job, but the user still needs a real speaker system. Apparently TWO 410s was not sufficient.
We're open to suggestions if you've got any.
One further note: using the Helix is a red herring/distraction as far as the topic at hand - it may be a good move for other reasons, but using it vs an amp has nothing to do with blowing woofers.
I'm aware that the Helix itself has nothing to do with blowing woofers. My thought process is that it could potentially kill 2 birds with one stone. I'm realizing through these responses, however, that the situation may be more nuanced than I had realized...a piece of enlightenment that I'm grateful for.
He needs to figure out what he's doing with his amp that's causing the issue.
How's his EQ set?
Truthfully, he's not the tone monger that I am, so I imagine how he sets his EQ depends on his mood. I try to encourage a more Geddy Lee type sound...something that holds the bottom end without being flubby or boomy, but cuts through so I can hear what he's doing. Unfortunately, during our recent audition, his cab was farting on occasion. Not all the time, but definitely enough to be noticed, and more frequently as the day went on.
Something worthy of note, playing at a place with 1,000+ people is kind of a dream in our case. Reality is, throughout the year the places we play will probably have a maximum occupancy of 300 people, give or take. Much larger than that, and we certainly hope to be in a position where the provided PA will be able to support ALL of the instruments. That said, I would HOPE that most any decent 4x10 with a decent amp behind it would suffice for full band volume in smaller venues during the year. But again, I'm a guitar player, and I could very well be wrong...I'll rely on you guys to tell me.
It's starting to seem like the most cost effective and long-term beneficial way of doing this would be for him to get a new bass cab, and either run the Helix into the FX Loop of his 500W Eden WTX500, or get some kind of clean poweramp, like the Crown XLS-1502 which was mentioned previously.
If that is to be the case, what I've taken from this is that it would be a good safety measure to HPF 50hz or so, in an effort to protect the life of the cab. Do I have all of that correct so far?
Additionally, how should one measure the wattage of an amp compared to the cab(s) in use?
As an example, his Eden head is 500W, but the cab he was previously using (Gallien-Krueger NEO410/4) was 800W. My understanding is that while a 500W head would never be able to push the cab to its fullest potential, it shouldn't do any harm in the meantime, right?
Lastly, someone in my area has a set of Peavey Headliner cabs for sale. A 4x10, a 1x15 and a 2x10, all for $500. They seem to be in really good shape, but I don't know anything about those cabs or if they're a decent value for what we're looking to do. Reviews seem solid, but again, I trust you guys will steer me into or away from them if they're worth/not worth it.
I am aware, however, that these are all 8ohm cabs, whereas his Eden head is 4ohm, so I imagine that wouldn't be a great combination. Additionally, the 410 is 800W, the 115 500W and the 210 is 400W. How powerful of an amp would he even need to utilize these??
Sorry for what almost certainly appears as total newb-ish questions, but I do appreciate all of the years of experience and insight you guys bring to the discussion. Seriously, it means a lot.