How to Set Up PA Systems : How to Set Up a Power Amplifier

[ThnD]

There's some ways to set up 8ohm impedance speakers.. and examples abt ohm's law..

2x8ohm speaker setup in 1 channel:

paraller(++ and --): 1/(1/8+1/8) = 4ohm ...

series(+- and -+): 8ohm+8ohm = 16ohm ...

so you got 2 choises split the power or double the power that amp gives to the speaker. Very easy... But be aware most of the PA amps can't handle smaller than 2ohms load per channel. specially in bridge situation.

[ThnD]

@ThnD with 3 8ohms speakers:

paraller: 1/(1/8+1/8+1/8)=2,6666....ohms­. So almost all todays amps can handle that...

series: 8+8+8 = 24ohms .. no sense

2 paraller + adding 1 series: 1/(1/8+1/8)+8 = 4+8 = 12ohm

4x8ohm spekers:

paraller: 1/(1/8+1/8+1/8+1/8)=2ohm

series: 8+8+8+8=32ohms..

paraller pairs to series: 1/(1/8+1/8) + 1/(1/8+1/8) = 4+4 = 8ohms ..

[Cody6210]

i have 2 8 ohm speakers in one channel is this okay

[lpoverdrive]

i just need something for my living room, very small/inexpensive but still loud if i need it. what amp should i use?

[SWATPhantom]

@lpoverdrive a 1000000000000 watts amp

[SWATPhantom]

@lpoverdrive kidding

[isaacu]

You said masterfaders....HA..

[techubbs94]

if 4+4=2 then all of my logic is thrown out the window

[readerwriter]

Overloading the impedance of your amp will most likely damage your speakers before it damages the amp. The first thing that will happen is the amplifier will begin to clip, when the amp clips it's creates square wave in the output signal to the speaker, that makes the speaker want to be in two places at the same instant, this in turn will most likely overheat the voice coil, first causing distortion then potentially frying the coil completely.

[kylie9832]

these people are craaapola

[questflow7]

u didnt even show how to setup the amp

[jonnyweston]

Daisy-chaining is serial connection - therefore the impedance is the total of all speakers imedances.

.

He's talking about parralell - which is not daisy chaining.

Parallel is worked out by taking the imp. of your lowest rated speaker, and dividing it by the number of speakers connected in total.

Say for example you have three speakers, a 6ohm, and 8ohm and another 8ohm. The Lowest connected speaker is 6ohm and you have 3 speakers, therefore the loading on the amp is actually 2ohms (roughly)

[VeryTucker]

"three quarters percent"....lol

[LONESTARZ38]

which one is better to put in powered mixer mode, for a 900 watt?(I DO GIGS AT BIG PARTYS and I OWN ALOT OF BIG SPEAKERS) "Main / Monitor" , "Left/Right", or "Main Brigde"...?which one would you recomend?...

[mehh25k]

In this case, using this apm, when connecting more speakers, can they add more than 4 ohms? Or it has to be kept as 4 ohms at all times?

[dmonks40]

I don't believe what he just said...4+4=2...Why does everything have to be so hard, now i have to hire someone to set up my stuff

[LaondaDj]

@dmonks40 law law..

[wtw88]

@dmonks40.

It's not hard.

Imagine a flow of water through one tap and then you turn another tap on. The flow is lots faster, maybe not twice as fast because the available flow may not allow it.

An eight ohm speaker resists the flow of electricity twice as much as two 8 ohm speakers. In other words, two eight ohm speakers allow twice as much flow of electricity as one 8 ohm speaker, depending on the available flow from the amplifier.

Hope this helps. You won't need help, just learn a bit.

[beisb0l]

@wtw88 so if i have 2 pa speakers, both 8 ohms, i should set my amp to 4 ohms?

[wtw88]

@beisb0l If you run two speakers in parallel, that is, if you run the (+) wire from the amp to the (+) terminal on speaker 1, then out of the(+) terminal to the (+) terminal of speaker 2, and your (-) from the amp to the (-) terminals on speaker 1 and onto speaker 2, your ohhmage resistance is halved. The alternative way to run speakers in parallel is to run two wires from the (+) amp terminal to the (+) on the speakers and from the (-) to the (-) on the speakers, but it uses more cable.

[vagadar]

@wtw88 So, guys, in simple words is this correct:

Chaining too many speakers into one channel causes damage to the equalizer, hence hooking up too many speakers with the equalizer as a whole damages it?

(What is "opposite channels"?)

[wtw88]

@beisb0l If you run speakers from opposite channels their impedance isn't altered.

[axmanshane]

Hi there,I recently bought an ADA mp1 which I use through the headphones out of my LINE 6 15 watt microspider..!!

 I'm realy short of cash and recently considered buying a

T.amp d 400,or possibly a more expensive model if I find it second hand..At least it should keep me going..do you think it will sound decent if I use a good speaker cabinet?How important is the quality of the power amp when you have goosd preamp and good speakers?

thanks

[bassman7530]

To be honest, this video was decent and had some good basic information. I learned more from this single video than I have from the countless other expertvillage videos I've watched combined.

[vincentproductions]

You guys are making some good points but I think something that has been missed here is something that took me years to find out. Choose an amplifier that matches the power handling of your speakers. I have been falsely told for years to turn a power amp all the way up because the "run best" wide open. Truth is, the controls are only signal input attenuators. All power amplifiers run "wide open" regardless of how the controls are set. You can't turn down their power, only the input signal :)

[skatexandxannoy]

2:41 he says masterbaters

[LaondaDj]

@skatexandxannoy master faders... lawlaw

[jackiecorn]

I am about to buy a pair of JBL Control 1x monitors,they are rated at 8ohm and says its recommend power is 10-80W. But I notice that most amps these days have well over 100-200W. Will these high power amps break my speakers or is it the higher the power the better?

[anaphaxeon]

@jackiecorn, 10-80W is super-super low wattage. I wouldn't run more that 100W into those... That being said though, I've run a Behringer 4000W amp (so it says) into 2 110W speakers, I just made sure that the amp was turned down really really low. Check to see if your monitors have protective circuitry in them, so that if you overload them, a relay removes them from the circuit... Moral of the story, you can turn a high power amp down....

[anaphaxeon]

This guy is only half informing everyone, and it could potentially cause damage. Here's the scoop, know the difference between wiring in parallel and series, if you have 2x4ohms in series, that's 8 ohms, but 2x4ohms in parallel is two ohms.

[MrJackanthony]

@anaphaxeon I studied that in high school lol

[anaphaxeon]

@MrJackanthony lol, I too studied this high school, perhaps the "expert" in this video should have stuck with it? idk, not a pro, or an expert or anything, and I know ohm's law is a little more complex than I've made it seem, but come on

[MrJackanthony]

exactly:P

[LaondaDj]

@anaphaxeon lawlaw

[franciscopcoutinho]

Hi, can you help me with something?

I have two cabinets that are rated at 300W RMS @ 4Ω, and one amplifier that gives me 500W per channel at 4Ω.

How do I set the volume in the amplifier? I am afraid that if I set it too high, I'll burn the cabs.

[brookhov]

Impedance is the resistance of a component at a given frequency.

BTW I have seen more speakers blown by too little power than too much. High frequency distortion will toast even the best drivers.

[doubtfuldjs]

so what would a 200 watt spaker be able to put out in decibels

[joeab09]

That completly depends on the efficiency of the speaker...

I have a very efficient set of 600W speakers that are only 10DB less running at 600W than a set of horribly made 2KW speakers running at 2kw

The efficiency and honesty of your amp is also a huge factor

some 1KW amps will only have an ACTUAL RMS output of 2 or 300W per channel

[anaphaxeon]

Check out the documentation on your speakers, there really isn't a reliable way to relate a speaker's power consumption to its Sound Pressure Level, look for SPL in the documentation. JBL JRX125's have a max SPL of 133dB (130dB is the threshold of pain for a human), anything between 100-120dB SPL is plenty loud...

[nathonjones]

8 + 8 = 4? WTF?

Please explain.

[RVTCDEN]

For resistance in electronics, wiring two speakers together (in parallel) will result in a smaller total resistance. To find total when you are connecting speakers, you can use R/N (if they are the all the same values) where R is the resistance of the speakers and N is the number of speakers. So a (4) 8 ohm speakers wired to one output would be seen by the amplifier as a 2 ohm load. This makes your amp put out 4 times more current and may result in thermal breakdown of your amplifier.

[MightySaturn5]

nathon -the lower the number in ohms the harder it is for an amplifier to operate because the lower the Ohms the closer you get to a dead short.

Most amplifiers want to see 8 Ohms, going higher is not so bad because less stress is placed on the amp -of course it will also deliever less power.

Putting two 8 ohm speakers together (in parallel) will be more difficult on the amp since the Ohms go down to 4 -the amp will put more power into 4 ohms but will distort easier & push the amp harder.

[metallicaandme90210]

i second that

[jtwellner]

when u daisy chain speakers the impedance is divided by 2 and when u hook them up in series it doubles

[jayzkie2006]

her's the formula for solving resistance or impedance for that matter.

for speakers in parallel connection

1/total impedance = 1/speaker impedance 1 + 1/speaker impedance 2 ......

for speaker in series connection

total impedance = speaker impedance 1+ speaker impedance 2....

you must know how to solve speaker impedance as not to burn your amplifier

[bakkenbears3]

And we dont fucking care!!!

[OyTaeMo]

there;s no such a thing.. you ;re talking about PMPO. but not the power of the amps.

[MightySaturn5]

JOL...you really don't know a thing do you

[amazingaustin13]

fuck the pa, just use full stack marshalls and stage amps

[bcrichplayer88]

dnt work pas are better in the long run

[DecibellSweden]

Dude, at 1:40..

4+4=2 Are you drunk?

If you connect them in series you get 8, you you connect them in parallel you get 2..

And another thing always max your amplifiers and use your processor to limit the system..

ALWAYS USE PROCESSORS ON BIGER SYSTEMS

[DubRuss]

you must be drunk. Think about what your saying. Series is together, parallel is separate. so 4omhs + 4omhs (series) = 2omhs.

And even if you set them in Parallel it wouldn't be 8omhs, it would be 4omhs per side.

Next time you try to be an E-thug make sure you know what the hell your talking about.

[AwesomeDudeGreat]

Hahaha

[chocolatecrisps]

u have downs didnt u think of wot parallel rofl they dont even meet. nice l0000l

[chicostixx]

artienda12 get a 31 band eq to really get the best sound out of your pa. a basic 3 band eq on a mixer is NOT nearly enough to get the maximum sound. you can tweek to perfection with a 31 band eq.

[artienda12]

can u help me to have good sound of my amp? it has bass , middle and trebble.. i dont know how to set them.. i need help T_T

[guitarlife21]

turn the bass to like 5 the midsto like 1 and the treble to like 8...thats how i like mine

[artienda12]

tnx.. :D

[stickdude913]

two 8 ohm speakers in parallel would be 8 divided by 2 = 4 ohms.

[prashanthosur]

so if I have an amp (Tech 21 PW 60) which is 8 ohms...can I use a power amp/? I just have one speaker...should I necessarily have more than one?

I want to retain the warmth of my tone at higher volumes ...I was told having a power amp helps in doing that....

I dont have an amp head, but I plan to use a power amp with a pre amp modeller( POD XT pro)with the Tech 21 PW 60 which says 8 Ohms...is it okay to run the pod into the power amp which is then connected to the amp?

[mmawss]

what is the best amp to buy for a club?

[elcko123]

a big one

[brucekirk89]

Ok I want to run all my rack gear seperatly through my mixer to control each seperatly can this be done????

[RandomSheep]

"maximize your signal flow at each stage of the gain" does this mean, turn it up as much as you can (or want in a mix) at the faders and on the amp etc?

[djsareawesome]

wow these retards are still posting? lol

[LaondaDj]

@djsareawesome gago mo ehhh lawlaw..

[sully93]

hey could anyone help me out here , so if i want to have a power amplifier i have to run it through a pre amp then into my head or speaker ? can someone clear this up for me please, thanks

[djsareawesome]

wow, you need to run it out of a mixer you dont need a pre amp.. who told you that????

[brianmpei]

Seriously good stuff. thanks for making these!

[pinkfloydeffect]

THANKS

[someone11110]

Hea man thanks.....the ohm's was messing me up lol

Video helped a bunch

[Dillyellow]

200w...HOW SMALL?

[ryanbycraft]

8+8 = 4... Ok thanks. hehe

[SetTheSkiesAblaze]

I hope that was sarcasm dude... Regardless, in case anyone out there was wondering. Adding two impedances/resistances of equal value in a "daisy-chain" configuration halves the total resistance. If they're of different resistances (dont do it, Im just saying) its 1/[(1/r1)+(1/r2)] with r1 / r2 being your speaker resistances. This works because daisy chaining is a parallel configuration, so the current passsing through the speaker is divided into two seperate paths

[ryanbycraft]

Wow, your dumb... Well at least Three people got what i was saying hense the +3

[psyfertech]

taht makes no sense, dont we all know 8 plus 8 isnt 4, half of 8 is if thats what i he meant, i dunno

[daillmeskin]

I guess one other question I should have asked too is it a bad idea to daisy chain 4 ohms and 8 ohms speakers together? How would that affect the amp as far as ohms go?

[urbandksound]

The formula is 1/(1/a+1/b+...). If you chain an 8ohm and 4ohm cabinet together, you get 2.6 ohms. If your amp isn't rated down to 2 ohms (many aren't) you're likely to damage it.

The QSC RMX850 will put out 430W into a 2ohm load. This means that each of your 2 amp channels was putting out a little under 400W--which was being split between the two cabinets.

[urbandksound]

Look at the continuous program power those cabinets are rated for. If it's 350W and 1000W respectively, you were way underpowered. Under-powering your speakers is worse than overpowering them--more likelihood of damage to the speakers as well.

You're right in thinking you should be getting another amp.

[daillmeskin]

How big of an amp would you suggest? I'm considering a QSC RMX 2450. Maybe 2 of them.

[guitard00d]

One 4 ohm speaker and one 8 ohm speaker paralleled is 2.6 ohms.

[daillmeskin]

One other question and maybe I should have asked this before posting my other question. On the back of each of my speakers of course it gives the peak and rms watts. For my Yamahas it's 2000 watts peak and 1000 rms. Is that for EACH speaker or BOTH speakers combined?

[daillmeskin]

How should I run this....

1 set of speakers rms 350 watts @ 8ohms

1 set of speakers rms 1000 watts @ 4 ohms

Should I be using separate amps to run each set due to the difference in ohms or could I still daisy chain the speakers and run off of 1 amp? I ran a qsc rmx 850 with these speakers daisy chained and it sounded real good. But after watching this and gathering info I realize my qsc might be at risk,right? I'm gonna get bigger amps too.

[humaxf1]

three 8 in parallel= 2.67 ohms

four 8 in parallel= 2 ohms

you will cause damage to your equipment if you place a lesser load on your amp than the load rating....be careful

[okeylang47]

i been learning in your videos and i appreciate that... quick question

if i have an 8ohm/4ohm/2ohm amplifier program

8ohm + 8ohm speaker produce 4ohm out right

but what about these parallel setup?

8ohm + 8ohm + 8ohm speaker is =__ohms

8ohm + 8ohm + 8ohm + 8ohm speaker =__ohms

hope you can help me on these i already do the math but im not confident with my answer

do you think i can parallel 4x8ohms speaker on a single channel for my mid and highs to my 2ohm-8ohm power amp?

[N0JoC0]

His comment about GAIN on the amplifier is incorrect! The knobs on the front of amplifiers are attenuator knobs. They control how much signal is being allowed into the amp... they do not adjust an amplifiers gain! Their reference to amplifier efficieny appears ambiguous as well.

[schno009]

The front knobs do in fact control gain. If you attenuate your signal with -10dB, your gain drops with 10dB, logic? They, in fact, don't control how much signal enters the amplifier, i can drive an amplifier to clipping with the know open for 1 quarter. You describe a limiter.

[mysterymeatgrinder]

This video should be more clear as to what is meant by "daisy chaining".

Should give a description of parallel vs series speaker connecting and how each affects the resulting impedance.

[JoKeR11239]

noob