WiiM Sub Pro is Now Available on Amazon US

[harkpabst]

Peak wattage and RMS wattages are different in audio lingo. It is routine to report RMS wattages for sub-woofers. Without knowing if it it Peak, Peak to Peak or RMS it is hard to compare the power of different amplifiers.


For example the SVS SB-1000 Pro has this spec

"325 watts RMS continuous power (820+ watts peak dynamic power)"

That is what I would like to compare.

Bottom line: You cannot tell the RMS power from a given peak power value. That's what I said.

Also, there's no such thing as peak to peak power. What should that be? You can specify peak to peak voltage (or current, if you need to, but with pretty much all Hi-Fi amplifiers being voltage sources this is less common). That's just two ways of describing the same thing.

We can easily convert RMS voltage into peak voltage or peak to peak voltage (still assuming sinusoidal signals), but not power measurements.

@RyanWithWiiM, can you please confirm that the WiiM Sub Pro is really a wireless subwoofer, not a 15" display?

 

[RyanWithWiiM]

Bottom line: You cannot tell the RMS power from a given peak power value. That's what I said.

Also, there's no such thing as peak to peak power. What should that be? You can specify peak to peak voltage (or current, if you need to, but with pretty much all Hi-Fi amplifiers being voltage sources this is less common). That's just two ways describing the same thing.

We can easily convert RMS voltage into peak voltage or peak to peak voltage (still assuming sinusoidal signals), but not power measurements.

@RyanWithWiiM, can you please confirm that the WiiM Sub Pro is really a wireless subwoofer, not a 15" display?

"¿Por qué no los dos?"

 

[RyanWithWiiM]

And for those who really want another option, here's a third pic

 

[Mr Ee]

Shudder... do the people taking the pictures never look at them critically?
They are ok for snaps, but for marketing...?

 

[harkpabst]

I still like the first picture best.

 

[dtc]

Bottom line: You cannot tell the RMS power from a given peak power value. That's what I said.

Also, there's no such thing as peak to peak power. What should that be? You can specify peak to peak voltage (or current, if you need to, but with pretty much all Hi-Fi amplifiers being voltage sources this is less common). That's just two ways of describing the same thing.

We can easily convert RMS voltage into peak voltage or peak to peak voltage (still assuming sinusoidal signals), but not power measurements.

@RyanWithWiiM, can you please confirm that the WiiM Sub Pro is really a wireless subwoofer, not a 15" display?

Well, these are old definitions that have been used for decades. You may not like the definitions, but they are very well established in the audio community. Most quality receiver, power amp or subwoofer specs include rms power. If rms is not in the spec, then there is always suspicion that the company is trying to inflate the true power. Reporting rms does away with that uncertainty. I doubt that will change any time soon. For people who have been in audio for a long time, specifying rms matters.

Power should be reported for a given impedance but that information is not always included, at which point it is assumed to be 8 ohms. Many manufactures, including Wiim, report power at 8 ohms and a 4 ohms.

I do agree that RMS is not necessarily Continuous. I believe that formula was introduced to approximate Continuous without having to do long and sometimes destructive testing to determine exactly when a unit could not maintain that power. But, it has become a well established term in the audio world.

Anyway, audio convention on power is well established. I doubt it will change.

 

[harkpabst]

Anyway, audio convention on power is well established. I doubt it will change.

I didn't ask for it to change. I just pointed out the facts.

When power figures are given for speakers with built-in amplifiers (like subwoofers) they are not related to any fictitious nominal impedance of course, but to the actual load.