With How Many Volts Are Ordinary PC Loudspeakers running?

[sirchai]

Sawasdee khrap,

I just wanted to get some speakers fixed that were affected by last year's flood. The net part is broken, went to a shop were the guy was asking me how many volts the transformer would have.

I bought them together with my Lemel PC, it shows Lemel on the speakers, but couldn't find anything related on the speakers, nor online.

Just some ordinary small speakers, with one little receiver in one installed. I'd assume that most speakers are running on 9, or 12 volts?

Any idea would be deeply appreciated. Cheers-

[RichCor]

OHMS LAW

Volts (E) = Amps (I) x Ohms ®

Amps (I) = Volts (E) / Ohms ®

Ohms ® = Volts (E) / Amps (I)

[ R=Ohms, E=Volts, I=Amperes ]

Speakers normally have rating capacity: Total Watts, Ohm impedance.

Speakers should always have a higher Watt capacity rating that the Amp (Amplifier) can produce.

Google: Speaker Power Rating Explained

[thaimite]

As stated above speakers are normally only rated in watts and need to be impedance matched to the system but that is not normally a problem.

Unless you are referring to the power supply to power a built in amplifier on the speakers, then the question makes no sense.

If you are referring to an external pwoer amplifier then it could be anything from typically 5 to 12 v9olts DC or AC depending on the make of speaker, but should be marked at the power input socket.

[sirchai]

OHMS LAW

Volts (E) = Amps (I) x Ohms ®

Amps (I) = Volts (E) / Ohms ®

Ohms ® = Volts (E) / Amps (I)

[ R=Ohms, E=Volts, I=Amperes ]

Speakers normally have rating capacity: Total Watts, Ohm impedance.

Speakers should always have a higher Watt capacity rating that the Amp (Amplifier) can produce.

Google: Speaker Power Rating Explained

Thanks a lot..I still remember quite most of the Ohmsche laws like U is I times R...etc....

I don't know the resistance, nor ampere. All I need to know is what voltage does the transformer bring to the items in the speakers?

Isn't that pretty much similar with all cheap speakers? Thanks for your input.

[thaimite]

OHMS LAW

Volts (E) = Amps (I) x Ohms ®

Amps (I) = Volts (E) / Ohms ®

Ohms ® = Volts (E) / Amps (I)

[ R=Ohms, E=Volts, I=Amperes ]

Speakers normally have rating capacity: Total Watts, Ohm impedance.

Speakers should always have a higher Watt capacity rating that the Amp (Amplifier) can produce.

Google: Speaker Power Rating Explained

Thanks a lot..I still remember quite most of the Ohmsche laws like U is I times R...etc....

I don't know the resistance, nor ampere. All I need to know is what voltage does the transformer bring to the items in the speakers?

Isn't that pretty much similar with all cheap speakers? Thanks for your input.

The voltage will vary with the volume. thus how loud and at what frequency do you want the voltage measured? As I said above the question makes no sense (in most cases) unless you are referring to the amplifier power supply.

having said that there are *were?) 100Volt line speaker systems used when you have multiple speakers providing sound for a room such as a scholl assembly hall etc, but this is not relevant in this case.

Edited April 16, 2014 by thaimite

[RichCor]

If you have a professional system, using step-up and step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables, then it may use Constant Voltage or High Voltage Audio Distribution System, rated at 25-, 70-, 70.7-, or 100-volt speaker systems.

If it is just a standard home system, then,

Today’s solid state amplifiers do a good job across the board of maintaining a voltage output of 2.83 volts

These numbers should be printed clearly near the output terminals of your amplifier, or stated in the user manual.

[Gregory Morozov]

Oh dear, and the OP just wanted to find a power supply for the piece of hardware that costs 500 baht new...

[RichCor]

Posted Today, 15:56

Sawasdee khrap,

I just wanted to get some speakers fixed that were affected by last year's flood. The net part is broken, went to a shop were the guy was asking me how many volts the transformer would have.

I bought them together with my Lemel PC, it shows Lemel on the speakers, but couldn't find anything related on the speakers, nor online.

Just some ordinary small speakers, with one little receiver in one installed. I'd assume that most speakers are running on 9, or 12 volts?

Any idea would be deeply appreciated. Cheers-

I totally misread your original post. Sorry.

"The net part is broken"

Are you saying the plastic or cloth cover is damaged? I don't understand. (probably really doesn't matter to the real question)

"...the guy was asking me how many volts the transformer would have."

Are these speakers 'powered', as they have a built-in amplifier powered from the mains (have a power cord) or a wall-wart transformer?

If so, the Volt/Amp of the supply could really be anything. Usually the requirement (Voltage Amperage, connector polarity) is stated near the power connector.

If you're trying to replace the speakers, buy a new set complete with power supply.

If you trying to replace the power supply of the current set ...good luck -- If it's a barrel connector there is NO industry standard on mm fittings.

PS: I owe you a free answer to the next question you pose, for being so far off the first time.

[sirchai]

Posted Today, 15:56

Sawasdee khrap,

I just wanted to get some speakers fixed that were affected by last year's flood. The net part is broken, went to a shop were the guy was asking me how many volts the transformer would have.

I bought them together with my Lemel PC, it shows Lemel on the speakers, but couldn't find anything related on the speakers, nor online.

Just some ordinary small speakers, with one little receiver in one installed. I'd assume that most speakers are running on 9, or 12 volts?

Any idea would be deeply appreciated. Cheers-

I totally misread your original post. Sorry.

"The net part is broken"

Are you saying the plastic or cloth cover is damaged? I don't understand. (probably really doesn't matter to the real question)

"...the guy was asking me how many volts the transformer would have."

Are these speakers 'powered', as they have a built-in amplifier powered from the mains (have a power cord) or a wall-wart transformer?

If so, the Volt/Amp of the supply could really be anything. Usually the requirement (Voltage Amperage, connector polarity) is stated near the power connector.

If you're trying to replace the speakers, buy a new set complete with power supply.

If you trying to replace the power supply of the current set ...good luck -- If it's a barrel connector there is NO industry standard on mm fittings.

PS: I owe you a free answer to the next question you pose, for being so far off the first time.

I'm sorry for my misleading post.

The power supply got damaged through a flood and I fixed it again today. It's one of these tiny PC speakers with a 230 Volt power cable, then the system is running with 9 volts.

There's nothing written on that crap, bought the computer with "Lemel" on it, a decent one, the speakers came with it.

I f finally found out that it's running with 9 volts, went to a shop and got it changed for 100 baht. The green light is on again. Will have to put it together and make the sound check tomorrow.

Again sorry for my irritating mail.. Good day to all.

Edited April 16, 2014 by sirchai

[NeverSure]

Audio confuses the heck out of me so I always just buy matching components. I do know that speakers will accept a wide range of power from below when they will make a sound right up to where you blow them out.

The green jack on your motherboard is rated 0V - 5V (DC I think) so oscillates around 2.5V. It isn't amplified so the amp must be in the speakers or headphones.

Now, when you upgrade to a PCI sound card you get amplification. You're getting either 3.3V or 5V depending on the pin and slot configuration, but you can still run your quality speakers off it. This is about the time you buy some good speakers that get power from the wall.

Bottom line - I wouldn't worry about it. The speakers will do anything from work fine to not make a sound to blow out the speaker cones. Unless you're running a powerful PCI card I don't see how anything bad could happen.