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FDP Forum / Performer's Corner / Subs as a "Low End PA"
FDP Forum / Performer's Corner / Subs as a "Low End PA"
Fast Lane Pablo
USAJun 18th, 2012 01:08 AM Edit Profile Print Topic Search
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I'm planning the PA rig for our next gig. We're a three piece acoustic/electric band, guitar, bass & drums. We usually don't need much in the way of PA, usually just acoustic guitar and vocals, but we're doing an outdoor show so I thought maybe we'd bring along a couple of small powered subs we have.
As I was drawing a block diagram to figure out what we'd need for mics and gear, I was thinking of using a small sub mixer for the drums if we needed to mic them. Then I got another idea. Since we got the subs to add a little low end to the mix what if I just ran a line from the bass amp and the kick mic to the sub-mixer and run it to the sub-woffers. The stage bass amp will take care of any bass information above the crossover point and if we need to throw any other mic's on the drums we could add them to the PA. Snare, hi-hat and overhead mic's don't have much low frequency information anyway so I wouldn't need them in the subs.
It seems like this would clean up the PA in general and make the bass and kick a little tighter. Any reason why this wouldn't work? We're going to try it out at rehearsals before the gig.
Uncle Pat
Central KY
Seasonal musicianJun 18th, 2012 04:14 AM Edit Profile Print Topic Search
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This is the theory behind aux fed subwoofers, which are apparently "it" in pro sound these days...only putting into the subs what really needs to be in them to yield a cleaner, low freq junk-free sound.
Definitely worth a try.
rockdoc11
USA
Bass is the place . . .Jun 18th, 2012 10:22 AM Edit Profile Print Topic Search
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When I wanted more bottom end in my/my band's PA, I bought a powered JBL sub.
I didn't want to take on crossovers and all that sort of stuff. So all the signal the sub gets is an AUX send from mixer from the kick drum, keys, and bass.
This seems to work fine for us, and is nice and easy.
heynorm
Omaha, USAJun 18th, 2012 11:44 AM Edit Profile Print Topic Search
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That's pretty much how we used to do it on a simple budget back in the day at "A" list places. Only what's needed there is sent there.
jbryan
MinneapolisJun 18th, 2012 12:17 PM Edit Profile Print Topic Search
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That should work fine! Having keys in our band, I just send everything (kick, bass guitar, keys) out from the L & R Main board ouputs to our powered JBL subs. There's a built in crossover that keeps the lows where they should be and kicks anything above to the main FOH speakers. Keys are different because they go from 'way low to way high'...so submixing those wouldn't be viable. But for your setup go for it!
Fast Lane Pablo
USAJun 18th, 2012 12:53 PM Edit Profile Print Topic Search
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Thanks, guys. If I were using a bigger mixer, a rack of power amps and the like, I'd use a crossover and do it up right. But with the little Carvin box mixer/amp, simple is good.
Tony Wright
Stillwater, OK
Built for comfort, not for speed.Jun 18th, 2012 10:56 PM Edit Profile Print Topic Search
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Most powered subs that I am familiar with have an unpowered "high pass" output that can come out of the sub and go into a pair of active mains (mid/high cabinets) or go into a power amp and then into the mains.
Most...well "many"...powered mixers that I am familiar with have an unpowered "Main Out" on the master section of the powered mixer...
You can take the full range unpowered signal out of the powered mixer's Main Out...
...send that signal into the input of the powered subwoofer. Since most active/powered subwoofers have a passive "high pass" output to go to their respective mains...
...you can then take that unpowered high passed signal back to the "Power Amp Input" (assuming your powered mixer has one) and send the mid/high signal thru the powered mixer's internal power amp and out to the main speakers.
Maybe not the best way, but it is one that is simple and does not require a lot of juggling and thinking when making adjustments during a performance.
You instruments and vocals go into the sub mixer and/or into the powered mixer depending on which mixer you put that specific source into...unpowered signal out of the powered mixer into the powered sub. Passive mid/high signal out of the sub and back into the powered mixer's internal power amps. Then take the powered signal out to the speakers for the mains.
You don't have to think about whether one source (guitar or bass or ???) needs to go into the Aux fed sub, because it all goes into the subwoofer and thru the internal crossover that you don't have to mess with...
Just another alternative signal path...It is how I would set it up because I like simple set ups.
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