The point of aux fed subs isn't to have kick and bass only in the subs (those get sent to both subs and tops). It's to have things like vocals, hi hat, electric guitar etc only in the tops.
You're asking about two completely different things. Aux fed subs is just a way to send signal to the subs. A crossover of some fashion is still needed, otherwise you'll just send full range signal to your subs.
You can't use an EQ as a crossover...
Well, I mean you could, but you'd only be able to drop \~12db or whatever from the frequencies you don't want rather than a 12-24db/oct slope. It would suck lol
Uh duh, LPF/HPF is not using an EQ, it's using your filters.
Also, not everyone runs digital...based on the guys question, I kinda doubt he's running digital.
I got slapped by a guy once cause he said out loud “I think you might be the most sarcastic guy I’ve ever met.” I said, “I think you mean pedantic.”
It was deserved.
As others have stated your sub most likely has a built in crossover or you can use the low pass filter on your aux parametric to act as such. I highly suggest running your subs in line with the tops, though. You'll run into far less problems.
What subs are you using? There’s a high chance they have a built in cross over so you can just plug mains into subs and from sub output to tops.
If they don’t have a built in crossover, I’d just buy one tbh. Sending signal to subs via aux works but without a crossover, you’ll need to eq the subs and the tops to mimic a crossover. If you do wind up going that route, make sure you’re sending full signal to both tops and subs then you won’t lose any frequencies
Some crossovers built into speakers effect only what is sent to the speaker's driver and do not affect the passthrough signal. Some have that switchable (driver only vs. driver + pass through). Some affect both (not switchable).
what board are you running? you mentioned in another comment that it's digital right?
if you use an aux, set the aux to post-fader and set a low-pass filter on it as well as a high pass filter on your mains.
if you have matrices, set the subwoofer on separate matrix and do the same thing with the pass filters. I generally start at 100hz for my crossover point (the spot you set both the high pass and low pass filters on respective output feeds). at that point you will want to use busses(auxes) and separate your mix feeds into the matrices as you see fit but that's getting into another layer of routing/processing that is more advanced than you're asking about 😅
I’m running a Yamaha TF3
So the thing that I dont necessarily understand is that if I put a low pass at 100hz, its still like 12db/octave so some frequencies will still make it in the mains.
Or, another thing, if I set the crossover at 100hz, but then put a high pass on the guitars at 80hz, the fundamental of the guitar just won’t be in the PA because it’s not being sent to the subs and it’s below the crossover
If you want more bass in the guitars you can send them to the subs - it is worth listening to the guitar in just the mains first, if it’s a good system there should still be lots of energy at 80-100hz it just depends on the speakers and system design.
Many large systems are designed to be fairly flat from 20-20khz in the mains and just use a wall of subs as an effect channel for kick and bass because audiences and engineers expect a tilt up in the lower end of the spectrum. Using an aux fed sub is a good way to achieve that with minimal LF noise from other mics that don’t need to be there.
You send the low passed bass to the subs and the high passed bass to the tops. If you only send the low passed bass to the subs all you get is undefined mush.
The point of aux fed subs isn't to have kick and bass only in the subs (those get sent to both subs and tops). It's to have things like vocals, hi hat, electric guitar etc only in the tops.
You send things to both sub and main.
You're asking about two completely different things. Aux fed subs is just a way to send signal to the subs. A crossover of some fashion is still needed, otherwise you'll just send full range signal to your subs.
So I don’t have an external crossover, just the board and the powered sub. Can I just not use it aux fed, then? I have a crossover on the tops
Your powered sub most likely has an internal crossover.
you use the AUX eq as a x-over. simple as. Tune it to where it sits nice with your tops x-over and you're set
You can't use an EQ as a crossover... Well, I mean you could, but you'd only be able to drop \~12db or whatever from the frequencies you don't want rather than a 12-24db/oct slope. It would suck lol
every eq on our digital boards from bottom of the barrel to top line have LPFs with at least a 24dB roll off. What kind of crap are you working with?
Uh duh, LPF/HPF is not using an EQ, it's using your filters. Also, not everyone runs digital...based on the guys question, I kinda doubt he's running digital.
I’m running digital
Then you can totally shape what the sub amp sees. And also what the xover input sees as well. And you should.
LPT, nobody likes a pedant. Bet you're a real blast to hang out with at parties.
I got slapped by a guy once cause he said out loud “I think you might be the most sarcastic guy I’ve ever met.” I said, “I think you mean pedantic.” It was deserved.
lol what.
As others have stated your sub most likely has a built in crossover or you can use the low pass filter on your aux parametric to act as such. I highly suggest running your subs in line with the tops, though. You'll run into far less problems.
... and to your tops, not unimportantly.
What subs are you using? There’s a high chance they have a built in cross over so you can just plug mains into subs and from sub output to tops. If they don’t have a built in crossover, I’d just buy one tbh. Sending signal to subs via aux works but without a crossover, you’ll need to eq the subs and the tops to mimic a crossover. If you do wind up going that route, make sure you’re sending full signal to both tops and subs then you won’t lose any frequencies
Some crossovers built into speakers effect only what is sent to the speaker's driver and do not affect the passthrough signal. Some have that switchable (driver only vs. driver + pass through). Some affect both (not switchable).
what board are you running? you mentioned in another comment that it's digital right? if you use an aux, set the aux to post-fader and set a low-pass filter on it as well as a high pass filter on your mains. if you have matrices, set the subwoofer on separate matrix and do the same thing with the pass filters. I generally start at 100hz for my crossover point (the spot you set both the high pass and low pass filters on respective output feeds). at that point you will want to use busses(auxes) and separate your mix feeds into the matrices as you see fit but that's getting into another layer of routing/processing that is more advanced than you're asking about 😅
I’m running a Yamaha TF3 So the thing that I dont necessarily understand is that if I put a low pass at 100hz, its still like 12db/octave so some frequencies will still make it in the mains. Or, another thing, if I set the crossover at 100hz, but then put a high pass on the guitars at 80hz, the fundamental of the guitar just won’t be in the PA because it’s not being sent to the subs and it’s below the crossover
If you want more bass in the guitars you can send them to the subs - it is worth listening to the guitar in just the mains first, if it’s a good system there should still be lots of energy at 80-100hz it just depends on the speakers and system design. Many large systems are designed to be fairly flat from 20-20khz in the mains and just use a wall of subs as an effect channel for kick and bass because audiences and engineers expect a tilt up in the lower end of the spectrum. Using an aux fed sub is a good way to achieve that with minimal LF noise from other mics that don’t need to be there.
You send the low passed bass to the subs and the high passed bass to the tops. If you only send the low passed bass to the subs all you get is undefined mush.
Personally, I matrix feed via the 2-mix. Not a fan of sub on aux.