Electronics > Beginners
Speaker watts same as electrical watts?
<< < (3/4) > >>
ZeroResistance:
Thanks, Thanks and many thanks for all the answers.

I can confirm and as jdraughn also rightly says there is no switch (voltage switchover) on the external panels of the enclosure.
There could be one inside the speaker, interestingly the fuse is rated at 250V AC.
The supply rating mentioned on the rear panel is 110 to 120VAC, 60Hz
IanB:
Do you have the speakers in your possession? Have you opened one up to look inside it? Pictures would be interesting.
ZeroResistance:

--- Quote from: IanB on June 20, 2018, 01:54:59 am ---Do you have the speakers in your possession? Have you opened one up to look inside it? Pictures would be interesting.

--- End quote ---

I took them apart there is a transformer at the input with a power switch and fuse in series with the primary, there seems to be no extra tapping on the primary (just 2 wires). Unfortunately I reassembled them back without taking any pictures. And then I just read your post, I will surely post pictures the next time I dissasemble it.
IDEngineer:
Bummer. Sounds like they have two different transformers for the two different markets. Someone probably just copied the generic spec sheet from the Chinese manufacturer without realizing that it's "one or the other", rather than "either".

If you're still looking for a way to run these 120VAC units on 240VAC, and you have to find a suitable transformer anyway, I'd look for a replacement for the 120VAC unit already in the speaker. It might be a standard physical size, and if you can match the secondary this would be the cleanest solution.
Zero999:

--- Quote from: IanB on June 19, 2018, 04:57:42 pm ---
--- Quote from: ZeroResistance on June 19, 2018, 04:36:41 pm ---I am looking for a 230 to 110Vac converter / tranformer for these...
--- End quote ---

I know this is a bit off topic and slightly pedantic, but it always puzzles me when I see this. You appear to live in the UK where the standard supply voltage is 240 V AC, 50 Hz. You are looking at a product for the USA market where the standard supply voltage is 120 V AC, 60 Hz. So why 230 V to 110 V? You would be better off looking for a 240 V to 120 V transformer (if indeed you need one at all).
--- End quote ---
Availability? 110VAC is a very common voltage on building sites, in the UK and transformers are widely available.


--- Quote ---To the power question, amplifiers have an efficiency and may produce some waste heat. So the input power will be slightly higher than the output power. On the other hand, you are unlikely to be running the speakers at full volume, so they will not be running at full power. On the third hand, it is always good to have an operating margin on the power supply. So probably go with 300 W or more power rating on the transformer.

--- End quote ---
Manufacturers also exaggerate the power output of their amplifiers, so it's a tricky one.

If the amplifier really is rated to 120V RMS, then I'd probably suggest a similar sized transformer, since the average power output, even at high volumes, will probably be around 1/8 of the maximum and the transformer will be able to withstand the surges.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod