Many long years ago, no one had much of an idea how to compare the power ratings of amps from the manufacturer's specs, and so the FCC and the government implemented a universal rating system that attempted to establish a set of standards for measurements that could improve the process of comparing different amps to one another. It basically forced manufacturers to publish honest power ratings by using the same methods of testing, and so we all had a chance to pick and choose which amps would do the best job of performing as intended, as we could compare the specs of all devices on an equal basis. Typically, an ad for, say, a Crown DC300A, would read something like, "155 watts per channel, both channels driven simultaneously from 20 Hz to 20 kHz, at 0.05% THD (total harmonic distortion), at 8 Ohms per channel. I may be mistaken, but it would seem that these specs were required to be printed in any ad that specified a given output power. Some manufacturers tried to manipulate these specs by fudging on the details, such as providing ratings at 4 ohms, or from 40Hz to 15kHz, or at 1% distortion, etc.. While this may have been legal, it didn't do the brands much good as the readers of those ads would soon be regarding them with suspicion. From the late 60's until the late 80's or early 90's, this was a good way to help everyone get what they paid for, and it made the job of setting up a good sound system a lot easier, as well. So, when exactly did this rating system evaporate? I looked around on the internet, and what I read indicated that this system is still supposed to be in place, but few of the manufacturers seem to adhere to it any more. This is the same old problem! If I want to run a bi-amped system with an 800 Hz electronic crossover, I'd want the low end to have roughly twice as much power as the high end, and if I want to save money by taking my chances in the free market and buy some used amps, I want to have honest specs available to compare them. I'd like to think that the amp I buy for the low end is actually more powerful than the amp I buy for the high end, right? I guess that I'd need a good Real Time Analyzer and a calibrated mic to ensure that my system will safely deliver a "balanced" sound to the room. I'd be using those anyway, plus trusting my ears a lot, but I wish that I could look up a bunch of the newer amps and read some honest, comparable specs without having to spend months or years determining which ones actually have more (or less) power. My question is, did these mandates just fly out the window, or did the manufacturers ignore what was eventually determined to be an un-enforcible set of rules? What am I missing? There are an awful lot of working systems out there these days, many of them somewhat elaborate in nature, and sometimes purchased and/or operated by ordinary people with no real professional backgrounds, and for the most part these systems perform adequately. Even before those standards were implemented, Julian Hirsch was publishing a great many specs in Stereo Review, and the FCC basically adopted his methods for those mandates. Who's testing anything these days? Can anyone trust the manufacturer's claims?
if I have 2 speakers per side of 500w rms 8 ohm what amplifier power does it need at 4 ohm per channel? Model and power exactly by mid hight frequenzi, and 2 speakers per side of 700w rms 8 ohm for subbass 160/20 Hz. Exactly.
Using qsc from 1998.
Mx, rmx, gx, kla, k, cp, pld, plx,❤
Many long years ago, no one had much of an idea how to compare the power ratings of amps from the manufacturer's specs, and so the FCC and the government implemented a universal rating system that attempted to establish a set of standards for measurements that could improve the process of comparing different amps to one another. It basically forced manufacturers to publish honest power ratings by using the same methods of testing, and so we all had a chance to pick and choose which amps would do the best job of performing as intended, as we could compare the specs of all devices on an equal basis. Typically, an ad for, say, a Crown DC300A, would read something like, "155 watts per channel, both channels driven simultaneously from 20 Hz to 20 kHz, at 0.05% THD (total harmonic distortion), at 8 Ohms per channel. I may be mistaken, but it would seem that these specs were required to be printed in any ad that specified a given output power. Some manufacturers tried to manipulate these specs by fudging on the details, such as providing ratings at 4 ohms, or from 40Hz to 15kHz, or at 1% distortion, etc.. While this may have been legal, it didn't do the brands much good as the readers of those ads would soon be regarding them with suspicion. From the late 60's until the late 80's or early 90's, this was a good way to help everyone get what they paid for, and it made the job of setting up a good sound system a lot easier, as well. So, when exactly did this rating system evaporate? I looked around on the internet, and what I read indicated that this system is still supposed to be in place, but few of the manufacturers seem to adhere to it any more. This is the same old problem! If I want to run a bi-amped system with an 800 Hz electronic crossover, I'd want the low end to have roughly twice as much power as the high end, and if I want to save money by taking my chances in the free market and buy some used amps, I want to have honest specs available to compare them. I'd like to think that the amp I buy for the low end is actually more powerful than the amp I buy for the high end, right? I guess that I'd need a good Real Time Analyzer and a calibrated mic to ensure that my system will safely deliver a "balanced" sound to the room. I'd be using those anyway, plus trusting my ears a lot, but I wish that I could look up a bunch of the newer amps and read some honest, comparable specs without having to spend months or years determining which ones actually have more (or less) power. My question is, did these mandates just fly out the window, or did the manufacturers ignore what was eventually determined to be an un-enforcible set of rules? What am I missing? There are an awful lot of working systems out there these days, many of them somewhat elaborate in nature, and sometimes purchased and/or operated by ordinary people with no real professional backgrounds, and for the most part these systems perform adequately. Even before those standards were implemented, Julian Hirsch was publishing a great many specs in Stereo Review, and the FCC basically adopted his methods for those mandates. Who's testing anything these days? Can anyone trust the manufacturer's claims?
+randolph patterson I completely agree with your toughts.
It's good one but what does class -A,B,AB etc, really mean and how does it works.
hay una version en español de este dvd?
what amp suitable for my 1pair speaker peavey pv115?
per spec it can only handle 400w program so suggest don't go over that in getting an amp
if I have 2 speakers per side of 500w rms 8 ohm what amplifier power does it need at 4 ohm per channel? Model and power exactly by mid hight frequenzi, and 2 speakers per side of 700w rms 8 ohm for subbass 160/20 Hz. Exactly.
Try this for better understanding - www.crownaudio.com/en-US/tools/calculators#amp_power_required