Ohms

[Norton12005]

Tuners,

If you connect two 8 ohms speakers bridge you get 4 ohms

What would you get if you connect two 8 ohms and one 16 ohm speaker bridge?

[flower95]

around 3.2
basic rule product/sum.

[Patman]

in parallel=.3125 ohms
in series=32 ohms.

[Norton12005]

.3125 or 5.3..........how to do the maths?

[Modified Sound system]

resistances in parallel= (R1 X R2)/ (R1+R2)
where R1= resistance of the first load
R2=resistance of the second load
Note :that is for combining two loads only in //

or multiple loads(more than 2) 1/RT= 1/R1+1/R2+1/R3...+Rn}according to how much loads you want to use (parallel only)

in your case series it will be rt=8+8+16=32.OHMS
(according to your impedances of your speakers)parallel will be 3.2OHMS plus or minus(because u said u wanted 2-8.OHM spkrs and 1-16.OHM)

[Norton12005]

ok, it sounding better............so can connect three speakers bridge if my amp can handle down to 2 ohms.......just need to ensure that it produces adequate watts for them all?

[Patman]

(1/8)+(1/8)+(1/16)=3.1........parallel
8+8+16=32.......series.....
...so........series the two 8 ohms and make it 16.............the parallel the 16 ohms speaker with it and it would become 4ohm total

[Norton12005]

Ok, ah lost now........

everybody seems to have the series at 32ohms so i can confirm that.............but the parallel is worriesome

[Gladiator]

(1/8)+(1/8)+(1/16)=0.3125........parallel
8+8+16=32.......series.....
...so........series the two 8 ohms and make it 16.............the parallel the 16 ohms speaker with it and it would become 4ohm total

Parallel is 1/[(1/8) + (1/8) + (1/16)] = 1/0.3125 = 3.2 Ohms

[Norton12005]

Ohms law screw up yes

[Patman]

(1/8)+(1/8)+(1/16)=0.3125........parallel
8+8+16=32.......series.....
...so........series the two 8 ohms and make it 16.............the parallel the 16 ohms speaker with it and it would become 4ohm total

Parallel is 1/[(1/8) + (1/8) + (1/16)] = 1/0.3125 = 3.2 Ohms

oh yea......my bad.........i was tryin to figure out wat i doin wrong

[Norton12005]

hum.....Tuners 3.2 final?

[nareshseep]

http://www.sengpielaudio.com/calculator-paralresist.htm
3.2 is korrec

[Patman]

yea 3.2 final

[Norton12005]

Good, final question

If the two 8 ohms speakers need 250 watts x2 =500 watts and the one 16 ohms need 200 watts, then my amp need to supply 700 watts to that bridge channel and 700 on the other bridge channel of my four channel amp.

So I need a 1400 watts amp? Is that good maths?

[Kasey]

First of all, you shouldnt confuse parallel/series with bridge mode. You cannot 'bridge' a speaker coil. It can either be paralleled, or Seriesed.

Ur amplifier will deliver its rated power into a specific impedance i.e. it will deliver more power into a 2-ohm load than a 4-ohm load.

Can u draw out ur system hook up. complete with speaker coil config, amp model number and specs?

If u cant do this, there only so much we can do to help. Other than that, u should leave the hooking up to someone who knows the electrical theory part. It is very difficult to understand the differences between impednce, resistance, voltage, current and power, and how they co-relate. It cannot be explained in one pararaph.

[mety57]

First of all, you shouldnt confuse parallel/series with bridge mode. You cannot 'bridge' a speaker coil. It can either be paralleled, or Seriesed.

Ur amplifier will deliver its rated power into a specific impedance i.e. it will deliver more power into a 2-ohm load than a 4-ohm load.

Can u draw out ur system hook up. complete with speaker coil config, amp model number and specs?

If u cant do this, there only so much we can do to help. Other than that, u should leave the hooking up to someone who knows the electrical theory part. It is very difficult to understand the differences between impednce, resistance, voltage, current and power, and how they co-relate. It cannot be explained in one pararaph.

well said kasey

[Patman]

@kasey lets help..........2ohm stable..........4 channel bridge makes 2x700 watts????ok........instead of eight wires from 4 channels, now you have 4 wires coming out from the NOW 2 BRIDGED CHANNELS............so you parallel your speakers and should end up with all 3 speakers having 2 current wires........so on the amp it bridged with 2 + and 2 -............connect the 2 + to the + from the three speakers and the 2- to the - from the three speakers..............DONT DO THIS AS YET!!!!!WAIT FOR MORE CONSULTATION!!

[- Rovin's car audio -]

good post by kasey kasem


this topic has been discussed many times b4 in d ICE Section of this forum .....

[Gladiator]

@kasey lets help..........2ohm stable..........4 channel bridge makes 2x700 watts????ok........instead of eight wires from 4 channels, now you have 4 wires coming out from the NOW 2 BRIDGED CHANNELS............so you parallel your speakers and should end up with all 3 speakers having 2 current wires........so on the amp it bridged with 2 + and 2 -............connect the 2 + to the + from the three speakers and the 2- to the - from the three speakers..............DONT DO THIS AS YET!!!!!WAIT FOR MORE CONSULTATION!!

Mods please delete the above before someone does that and burns down their equipment...

[Norton12005]

let the post run this is how people get knowledge at some point in time no one here knew any of this.........Patman good advice............you should share what you know but advised individuals to be cautious............

[Gladiator]

let the post run this is how people get knowledge at some point in time no one here knew any of this.........Patman good advice............you should share what you know but advised individuals to be cautious............

Bro that is not any kinda "advice".... that is utter nonesense that will cause your amp to smoke out.

SR posted a sticky in the ICE forum to be careful to who you listen to. I think this applies here. You should read it also....

The thread can run, but that post is severely dangerous. Its like you telling people to put a litre of pepsi in your gas tank to clean it out.

Mods please move this to ICE Forum ...

[Norton12005]

Glad relax, no one wiring anything here........people are seeing all the comments so if someone try this dem crazy.........good advice is being shared from you guys.......

[Norton12005]

Tuners, check OHMS 2 post some info I got online.......

[Gladiator]

No Scene...

The 16 ohm speaker does not belong in the car. You can bridge the 4 channel amp and run one 8 ohm speaker per bridged channel.... that will give you less than half the power the amp is capable of though.

Another arrangement (which will work practically but is not technically correct) is to get a 2 channel amp that can be bridged into 2 ohms, parallel all the speakers and run a mono system.

[Norton12005]

Glad, ah have the info bro...............in Ohms 2.........respect


Mods move to ICE forum....................please

[mety57]

fellas how can u test a speaker for wattage

[Kasey]

^^u cannot.

[3stagevtec]

I like this thread, don't make enough time to make a proper response though..

In Series - 32ohms
In Parallel - 3.2ohms

[3stagevtec]

Good, final question

If the two 8 ohms speakers need 250 watts x2 =500 watts and the one 16 ohms need 200 watts, then my amp need to supply 700 watts to that bridge channel and 700 on the other bridge channel of my four channel amp.

So I need a 1400 watts amp? Is that good maths?

Remember there is Peak power and RMS power.. when matching speakers to amplifiers, always follow the RMS values.. Peak figures are more 'marketing' information, you can ignore them..

a true 1400W (rms) amplifier will be a very big and expensive fella.. a 1400W peak amp is your everyday 4CH..

You can use any 4CH to power those speakers, having less power will not damage the speakers, it just means you can't play them to their full potential..