radio_schizo
don't look now
Join date: Sep 2004
2,833 IQ
#1
Would it be ok to play the bass straight into the P.A. mixer without an amp for a small show? Becuase I have a gig soon and my amps broken, and I could have sworn I read somewhere that you can do this.

Plus, when recording you can plug it straight into the mixer, so I don't see why you wouldn't be able to for this.

Thanks.
UtBDan
BA of Music Theory
Join date: May 2004
4,564 IQ
#3
^ not necessarily true.

If you have a bass with passive pickups, you need a DI Box.


Even with that, the PA system needs some subwoofers and not just normal PA cabs to handle the bass. Otherwise, it can and will explode on you. And you don't want that.
Quote by casualty01
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BA in Music theory
MusicMan Bongo, SUB -> Orange Terror 1000 stack

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telemaster1952
Resident AssHat
Join date: Sep 2005
411 IQ
#4
Quote by UtBDan
^ not necessarily true.

If you have a bass with passive pickups, you need a DI Box.


Even with that, the PA system needs some subwoofers and not just normal PA cabs to handle the bass. Otherwise, it can and will explode on you. And you don't want that.


^not necessarily true either

if you are using a passive bass, to boost the bass you want a DI box but it will work fine without one, subs would be a good idea, but depending on how high you want to go with the bass
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FunkMaster
UG's Hartke Promotor
Join date: Sep 2002
280 IQ
#6
DI is needed when sending the signal a long way to the desk. A DI doesn't amplify the sound, it can reduce the sound though, but it converts the signal from an unbalanced to a balanced signal. So active and passive basses will get a DI between bass and amp most of the time.
Subwoofers isn't a must have, but a prefer have. Having subs will make your sound better. Having a lot of power is a must have. A 200w PA wont be enough for vocals and bass.
So it all depends on the size of the PA.
Quote by John Swift
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seljer
UG Resident
Join date: Apr 2005
1,380 IQ
#8
Quote by radio_schizo
Sorry, but what is a D.I box? I think I have a vague idea.


direct input box

used for taking instrument/mic level signals to line level signals and turning unbalanced signals into balanced ones
UtBDan
BA of Music Theory
Join date: May 2004
4,564 IQ
#10
Quote by seljer
direct input box

used for taking instrument/mic level signals to line level signals and turning unbalanced signals into balanced ones


actually, its direct inject, but no one ever wants to say that.

I don't know if you can do it with a mixer, I was just always taught that passive basses would damage the PA without a DI. And as far as I was taught, that was basically the DI's only purpose.
Quote by casualty01
the RIAA can't shut us down, interpol can't shut us down. the U.S. gov't can't shut us down and CERTAINLY not YOU can shut us down.


BA in Music theory
MusicMan Bongo, SUB -> Orange Terror 1000 stack

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FunkMaster
UG's Hartke Promotor
Join date: Sep 2002
280 IQ
#11
Every decent mixer has a balanced (XLR or stereo jack) and unbalanced input (mono jack).
So if you're standing 3 meters away from the desk, you can plug in directly.
However, most FOH desks are about 30m away from the stage. An unbalanced signal cable is more sensitive to noise and hum (anyone recognises the radio/telephone signals comming from their amps??). The longer the cable, the more risk. To avoid this, they transform the signal into a balanced signal.
Another thing is that most stage blocks (that is the end of the multicore cable on stage with the female XLR, the other end is at the FOH desk)- if not all stage block - use balanced xlr signals.
If you want more info on DI's, do a google search. Terms: "direct injection box" or "DI box"...

and seljer, the don't put a DI between mics and desks. DI's just convert unbalanced to balanced. it converts instrument to mic(/line) levels. The switch between mic and line levels hapens at the desk.
Quote by John Swift
My neighbour bought his son a Mark Hoppus bass for Christmas, the set-up on it was terrible (the neck had so much bow they should have supplid arrows with it).


Its nice to be important, but its important to be nice...
FunkMaster
UG's Hartke Promotor
Join date: Sep 2002
280 IQ
#13
^depending on the size of the pa...
Quote by John Swift
My neighbour bought his son a Mark Hoppus bass for Christmas, the set-up on it was terrible (the neck had so much bow they should have supplid arrows with it).


Its nice to be important, but its important to be nice...
83lespaulstudio
Registered "Old Fart"
Join date: Apr 2005
193 IQ
#14
thank you, Funkmaster for that very accurate and informitive explanation.
you guys listen up, there is alot to be learned, here.

playing through a P.A. should work fine. i have done it several times. but it does effect the sound. going through the P.A. puts you out in front of the drums, and guitars. your sound will reach the audience first. not really a big problem with guitars(high fequency), but unless you mic the kick drum, it could sound out of phase.
this phasing effect makes it hard to get a tight, bottom end. pardon the pun.
fitzsy05
Registered User
Join date: Dec 2005
11 IQ
#15
gits fine to plug it into the PA, just turn the treble up and drop the strings. also, with the sound level levers turn them all down to the lowest setting. dont forget (dont plug it in with a mike as well).
83lespaulstudio
Registered "Old Fart"
Join date: Apr 2005
193 IQ
#16
Quote by fitzsy05
gits fine to plug it into the PA, just turn the treble up and drop the strings. also, with the sound level levers turn them all down to the lowest setting. dont forget (dont plug it in with a mike as well).


there is no need to adjust the bass set-up, to play through a P.A.
Johnnymacbrown
Registered User
Join date: Jul 2012
10 IQ
#17
Depends on the room characteristics and the number of people.... A PA speaker can only handle so much output. They work the hardest when they are pushing bass waves. Your amp uses the most wattage when bass waves are being produced. In a small venue with only a few hundred people its best not to line-in the bass. The less the PA has to do the better the quality it can reproduce. Bass waves are omni directional and are high energy. Above 1500 cps the lower the energy level the waves have and therefore the more they have to be aimed toward the listener
When you buy a home theater system the bass cabinet can be placed anywhere but the speakers which provide the high end are positioned toward the listener.
Tostitos
caffeinated
Join date: Jan 2009
868 IQ
#18
How do you even dig up an almost 7 year old thread?
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