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New Orchard Class D amp

It's the continuous 5 minutes requirement who makes all the difference.
And that's all the way from 20Hz to 20kHz.

Looking at Amir's multi-Freq vs Power results (which by no means last 5 minutes) and the variations either down-low or up-high a lot of amps have to change specs.
 
You can keep all your current specifications as optional disclosures, but they must be clearly marked as not tested under the FTC standard. See below:

View attachment 383217

It is the headline specifications you must add which are the requirement of the Rule. They are not optional and must be prominent right down to the size/bolding of the fonts.

Your 500W headline figure is non-compliant:
View attachment 383222

View attachment 383216

The FTC standard test conditions may enable you to potentially claim even greater power than you already do, but it must be across the entire bandwidth (20-20k) from 250mW to full rated power as the threshold is 1% THD+N for a minimum of 5 minutes continuous sine wave.

You no doubt produce some awesome products and are a very talented amplifier designer. That doesn't mean you can continue to thumb your nose at compliant advertising, especially as it has now been set in stone (again) with even more clarification than ever before. It's a long time coming and consumers will be better served by manufacturers and importers taking this seriously.
Thank you for bringing it to my attention, I will make changes over the next few weeks to the website, but out of curiosity can you link me to a manufacturer's website that is fully compliant with the FTC rules?
 
Thank you for bringing it to my attention, I will make changes over the next few weeks to the website, but out of curiosity can you link me to a manufacturer's website that is fully compliant with the FTC rules?
Compliance will probably has to start at the usual modules companies (Hypex,Purifi,icepower,etc) along with the mega-companies.

Problem is that some of the module ones state a peak power (or burst or whatever) and some of them clearly state that continuous power is something like the 1/8 or some other number and even that depends (as they state) by the cooling solutions.
It's the NC400 that started that I think,I remember battles all over audio forums back then.

It's going to be a mess with them,that's for sure.
 
Compliance will probably has to start at the usual modules companies (Hypex,Purifi,icepower,etc) along with the mega-companies.

Problem is that some of the module ones state a peak power (or burst or whatever) and some of them clearly state that continuous power is something like the 1/8 or some other number and even that depends (as they state) by the cooling solutions.
It's the NC400 that started that I think,I remember battles all over audio forums back then.

It's going to be a mess with them,that's for sure.
They do - but a couple of years ago, I contacted one of the UK Based assemblers of Hypex NCxxMP modules to ask about the duration of the "full power". He stated he'd tested for it, and stopped the test after 10 minutes.

So that would easily comply with the new rules.
 
I'd much rather the likes of Appolon audio, measurements are available here and their higher tier casework is much classier.
 
They do - but a couple of years ago, I contacted one of the UK Based assemblers of Hypex NCxxMP modules to ask about the duration of the "full power". He stated he'd tested for it, and stopped the test after 10 minutes.

So that would easily comply with the new rules.
@StigErik 's NC502MP gave up the smoke in his torture 60 sec tests on the other hand.

Question:How FTC ensures test conditions and accuracy of results?
Or it only investigates after some kind of report?
 
It's the continuous 5 minutes requirement who makes all the difference.
And that's all the way from 20Hz to 20kHz.

Looking at Amir's multi-Freq vs Power results (which by no means last 5 minutes) and the variations either down-low or up-high a lot of amps have to change specs.
Who decided and why it was necessary that the high fidelity amplifier for domestic use be able to deliver its maximum power for 5 minutes? Why not 2, 4, 6, 10 minutes or indefinitely?
Isn't it as if we were forcing DAC manufacturers to announce real resolution performance measured on their analog output: none would be 24 bits. And no recording of acoustic music made with a condenser microphone could claim that...

I obviously agree that many manufacturers have been announcing fanciful powers for years and years, I also agree with the fact that we must put order and sincerity in the performances they announce , but I wonder why the maximum power should be measured this way to be announced in the United States?
 
Keep in mind that any and all US Federal Agencies are fair game for endless constitutionality challenges now that SCOTUS has vacated deference to Chevron. In other words, US Agencies just their power play checked hard and it's payback time
 
Who decided and why it was necessary that the high fidelity amplifier for domestic use be able to deliver its maximum power for 5 minutes? Why not 2, 4, 6, 10 minutes or indefinitely?
Isn't it as if we were forcing DAC manufacturers to announce real resolution performance measured on their analog output: none would be 24 bits. And no recording of acoustic music made with a condenser microphone could claim that...

I obviously agree that many manufacturers have been announcing fanciful powers for years and years, I also agree with the fact that we must put order and sincerity in the performances they announce , but I wonder why the maximum power should be measured this way to be announced in the United States?
As far as I now it was a long process with all parties involved and at the end they all agreed to that.
Don't know the specifics though,other than no one objected in the given time.

Edit:At the same link I gave above,@NTK has posted the rule.

 
As far as I now it was a long process with all parties involved and at the end they all agreed to that.
Don't know the specifics though,other than no one objected in the given time.

Edit:At the same link I gave above,@NTK has posted the rule.

Thak You !

Very interesting and informative read...

Between us, I would prefer that a standard require manufacturers to give continuous power to both channels in service from 20 Hz to 20 Khz for a distortion fixed at 0.1% over this entire band for durations that the standard would set so just as arbitrary as the only five minutes retained: 60 seconds, 5 minutes, 10 minutes...
The same class AB amplifier equipped with more or less large cooling radiators will deliver a power determined by its cooling capacity, leading to a more or less high price of the amplifier whose case will not be the same... and then this will ultimately depend on the power of the amp... That a 30 watt amp must be able to deliver its maximum power for 5 minutes is much more important than a 300 watt amp can do it...
Personally, an amp that can deliver 300 watts!

"Only" 60 seconds suits me very well with a powerful amp...
 
As far as I now it was a long process with all parties involved and at the end they all agreed to that.
Don't know the specifics though,other than no one objected in the given time.

Edit:At the same link I gave above,@NTK has posted the rule.


So I may be comepletely wrong here but if you read the requirement as is...
Rated power shall be minimum sine wave continuous average power output, in watts, per channel (if the equipment is designed to amplify two or more channels simultaneously), measured with all associated channels fully driven to rated per channel power.

Average value for sine wave = 0.637 × peak value, Vpk
RMS value for sine wave = 0.707 × peak value, Vpk

I would think they mean RMS value in that statement, but taken at face value this become even harder as traditionally power rating are always in RMS not averate. As average power for sine way is ~10% less then RMS.
 
No. Average power (over integer number of periods) gives the RMS value (= (1/sqrt(2))^2).

avg_power.png
 
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