bean
A few things to point out...
The CEA standard attempts to normalize some parameters, to produce one easily understood number, and as such, there are compromises, it's not perfect...
It should make it easier for the average consumer to compare, but that's only IF all the manufacturers the consumer is looking to purchase from USE the CEA standard...
If the customer is looking at say, RF, JL, and DEI, and they all publish the CEA specs... and Boss, who doesn't... the Boss amp still will sure look more appealing, to a consumer who doesn't know about power rating standards, won't it? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
...and by the time an enthusiast gets to the point where they understand why the non-CEA ratings are inflated and not comparable to the CEA ratings, they are likely going to be expert enough to not really need the hand-holding of the CEA standards at any rate, unfortunately. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
Currently, to rate amplifier power, you'd need to state something like:
____ watts x _____ channels at _____ ohms, _____ volts DC, measurement taken at _____ Hz up to _____% allowed distortion.
But even high-end companies don't publish this spec...
You're lucky if you get a birthsheet that says:
____ watts at ____ ohms at _____% distortion
And most often, current power ratings are simply published as
____ watts x _____ channels at _____ ohms.
So the CEA standard should equalize out the rest of the factors, making for more comparable numbers.
However, consider that the CEA standard attempts to reduce all of that above, into
_____ watts with a signal-to-noise ratio of _____.
That means all the other factors are equalized out...
Think about that:
There are additional specs that can be published, if it's desired to publish numbers outside of the native spec, but that's a bit of a step back towards what we have today. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
I've got a mobile audio industry mag that explains the CEA standard inside and out, I was going to publish a little summary for it at some point...
The CEA standard attempts to normalize some parameters, to produce one easily understood number, and as such, there are compromises, it's not perfect...
It should make it easier for the average consumer to compare, but that's only IF all the manufacturers the consumer is looking to purchase from USE the CEA standard...
If the customer is looking at say, RF, JL, and DEI, and they all publish the CEA specs... and Boss, who doesn't... the Boss amp still will sure look more appealing, to a consumer who doesn't know about power rating standards, won't it? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
...and by the time an enthusiast gets to the point where they understand why the non-CEA ratings are inflated and not comparable to the CEA ratings, they are likely going to be expert enough to not really need the hand-holding of the CEA standards at any rate, unfortunately. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
Currently, to rate amplifier power, you'd need to state something like:
____ watts x _____ channels at _____ ohms, _____ volts DC, measurement taken at _____ Hz up to _____% allowed distortion.
But even high-end companies don't publish this spec...
You're lucky if you get a birthsheet that says:
____ watts at ____ ohms at _____% distortion
And most often, current power ratings are simply published as
____ watts x _____ channels at _____ ohms.
So the CEA standard should equalize out the rest of the factors, making for more comparable numbers.
However, consider that the CEA standard attempts to reduce all of that above, into
_____ watts with a signal-to-noise ratio of _____.
That means all the other factors are equalized out...
Think about that:
- Amps will be measured on a 14.4v supply
- Amps will be measured at 1% distortion
- Amps will be measured at 1Khz
- S/N ratio will be taken with 1 watt of input power
There are additional specs that can be published, if it's desired to publish numbers outside of the native spec, but that's a bit of a step back towards what we have today. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
I've got a mobile audio industry mag that explains the CEA standard inside and out, I was going to publish a little summary for it at some point...
jemorgan85
10+ year member
SPL Tactician
Once again well said by Geolemon.
helotaxi
5,000+ posts
Kilroy was Here
So much for all the Class D sub designs...
denim
5,000+ posts
SSAudio.com
I thnk they are trying to make all the amps advertise true power
helotaxi
5,000+ posts
Kilroy was Here
I realize that and to a point agree that it is a good idea, but you can't test every amp the same way. Just as most speakers being measured for sensitivity at 1kHz doesn't give an accurate measurment for subs, so measuring Class D sub amps at 1kHz won't work cause a lot of them cannot play that high.
denim
5,000+ posts
SSAudio.com
thats true
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