Hi Everyone,
I am working on a project that requires the use of speakers. I came across these:
They claim 97db at 2.8v. Which seems pretty loud to me. Does this mean that I should not drive the speaker with more than 2.8v? If so, I assume I need to have a voltage divider out of the output of whatever I use for amplification (transistor, LM386, etc), correct?
I apoligize in advance if this question is stupid. I did a lot of searches and could not find the answer.
Thanks,
Jose
This is Tweeter Speakers for Car with Impedance: 4 ohm,
You will not getting high voltage on it, no need voltage divider, just connect it to LM386 will do.
Rated power: 40 w
The maximum power: 500 w
Audio Frequency response: 2 KHz - 22 KHZ
Impedance: 4 ohm
That's a bit more efficiency than the average speaker. And yeah, 97dB is pretty loud but every amplifier has a volume control. Whatever amplifier you use should probably have a volume control too.
2.8V RMS into 4 Ohms is about 2 Watts (Voltage squared/resistance).
Note that's a tweeter, so it's only usable at high frequencies.
Real world audio (voice & music) usually has a peak-to-average power ratio of 10 or more. That means an amplifier that's hitting 2W on the peaks will be averaging around 0.2W. Our ears don't respond instantly to short-term peaks, so the "loudness" is more-related to the 0.2W.
I'd be skeptical about that 500W rating... An honest 500W rating on a pro tweeter means the tweeter can be used with a 500W amplifier. That's 500W peak with music (50W or less average), not constant test tones. And, most of power goes to the woofer and midrange with very little going to the tweeter (filtered by the crossover). That means you might be able to fry a "500W" tweeter with a 50W test tone. On top of all that, consumer speakers are usually more "optimistically" rated than pro speakers, if you trust stuff sold on eBay at all!
Thanks for the replies. What does the 2.8v mean then? How high can I drive the speakers? I'm thinking my setup will be 6v regulated down into an attiny. I was assuming the lm386 can be driven directly from the 6v and the input to it from the regulated attiny.
Regards,
Jose