At 8 ohms 2.83V will translate to 1W while at 4 ohms it will translate to 2 watts. So at 8 ohms they are equal, while sometimes a 4 ohm speaker will be quoted the sensitivity at 2.83V/1m to sound more efficient or just because it's easier to match driver sensitivity knowing the 2.83V sensitivity when you have drivers of different impedences.
Sy: Technically true. Also, since most speakers have a tendency to be above their rated impedance much of the time, who is to say what is a 4 ohm or an 8 ohm speaker?
Bass reflex speakers have an impedance minimum at the tuning frequency, usually 1 or 2 ohms above the DC resistance of the woofer. Time was, they rated a speaker where the minimum was. So if the impedance minimum is 6.8 ohms, they would rate the speaker as 8 ohms, because the minimum was a lot closer to 8 than to 4 ohms.
Now, some speakers with impedance minimums of 4.7 ohms or so are being marketed as 8 ohm speakers. So it is tricky.
Still, with the advent of even 2 ohm speakers for cars being rated by 2.83V, getting a speaker whose impedance minimum is reasonably close to 8 ohms is something of a blessing. Considering what the makers of 4 ohm speakers and 2 ohm speakers are getting away with by using the 2.83V standard, a manufacturer who pushes a 6 ohm speaker as an 8 ohmer looks good by comparison.
Bass reflex speakers have an impedance minimum at the tuning frequency, usually 1 or 2 ohms above the DC resistance of the woofer. Time was, they rated a speaker where the minimum was. So if the impedance minimum is 6.8 ohms, they would rate the speaker as 8 ohms, because the minimum was a lot closer to 8 than to 4 ohms.
Now, some speakers with impedance minimums of 4.7 ohms or so are being marketed as 8 ohm speakers. So it is tricky.
Still, with the advent of even 2 ohm speakers for cars being rated by 2.83V, getting a speaker whose impedance minimum is reasonably close to 8 ohms is something of a blessing. Considering what the makers of 4 ohm speakers and 2 ohm speakers are getting away with by using the 2.83V standard, a manufacturer who pushes a 6 ohm speaker as an 8 ohmer looks good by comparison.
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