Getting a system
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From: Cheney, Wa
Getting a system
the class of the amplifer is it switching method, a flows a sine wave, b also does but do to the nature it uses to switch it has a notch in it during the transition from positive to negative. d also has a distrotion from switching because there is a dead time between positive and negative. also there is no half speed for a class d amp its full full power (for a given volume) or completely off. this site is pretty good about explaining them
http://www.eatel.net/~amptech/elecdisc/ampclass.htm
http://www.eatel.net/~amptech/elecdisc/ampclass.htm
Elder User
Joined: Apr 2003
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From: Cheney, Wa
Getting a system
Originally posted by superswamper
the class of the amplifer is it switching method, a flows a sine wave, b also does but do to the nature it uses to switch it has a notch in it during the transition from positive to negative. d also has a distrotion from switching because there is a dead time between positive and negative. also there is no half speed for a class d amp its full full power (for a given volume) or completely off. this site is pretty good about explaining them
http://www.eatel.net/~amptech/elecdisc/ampclass.htm
the class of the amplifer is it switching method, a flows a sine wave, b also does but do to the nature it uses to switch it has a notch in it during the transition from positive to negative. d also has a distrotion from switching because there is a dead time between positive and negative. also there is no half speed for a class d amp its full full power (for a given volume) or completely off. this site is pretty good about explaining them
http://www.eatel.net/~amptech/elecdisc/ampclass.htm
Elder User
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From: New Canaan, CT
Getting a system
Ok I read the article and saw the graphs under the class D section but I didnt see a comparison of wave forms from each class and I didnt see in the article it specificly saying class D reproduces the waveforms square unless thats what the graphs where representing. I will look at it again tomorrow after a good nights sleep. My eyes are burning right now....lol
Postmaster
Joined: Mar 2002
Posts: 3,545
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From: Coal Region
Getting a system
lightning audio is indeed owned by RF and is a decent piece of equipment. only thing i personally use Crotchfield for is speaker sizes =). i always thought the different types of music/noise/sounds form different wave patterns? maybe im wrong...
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From: Somewhere between Heaven
Getting a system
Originally posted by superswamper
this is what a class d sound wave looks like, before the output filter
this is what a class d sound wave looks like, before the output filter
One other thing...the link is somewhat incorrect in some of it's content. Full range Class D's are not just a myth anymore...Xtant has just released one that has absolutely no ill effects on high frequencies. It got rave reviews in one of the car audio mags (the most recent issue...don't know which mag, though) and benched very, very well. Class D can now do full range with a little ingenuity, creativity, and know-how. Time will tell if other manufacturers jump on board, but Xtant has shown it's a very real thing.
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From: Cheney, Wa
Getting a system
like with all amps though quality shows,
in class d's it can be alittle more costly however
in class ab amps in a company goes cheap on compentents the only side effect are sound quality and an over rated power spec.
however in the class d, if the maker uses inferior compents to save cost (to sell for a lower price). not only will it not have good sound quality and underperform power wise. but the output filter may also do an inferior job in smoothing out the sound curve. thats where trouble arrises and why i wouldn't suggest using a cheap class d amp.
in class d's it can be alittle more costly however
in class ab amps in a company goes cheap on compentents the only side effect are sound quality and an over rated power spec.
however in the class d, if the maker uses inferior compents to save cost (to sell for a lower price). not only will it not have good sound quality and underperform power wise. but the output filter may also do an inferior job in smoothing out the sound curve. thats where trouble arrises and why i wouldn't suggest using a cheap class d amp.
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From: Somewhere between Heaven
Getting a system
Inferior components can be used to make a Class D amp, but I've yet to come across one whose output filters didn't "do their job". Whether you speak of Pyramid or DEI, the output filters will output the correct signal/shape wave. The quality of the filters might induce noise, might have a short life, or might be inferior in every way to the filters used in "better quality" amps, but a square wave being ouput will just not happen (again, this is assumed that the amp is run under normal operating conditions). Class D techology has matured to the point that A LOT of home audio manufacturers are using them as the power source for their subs. Not just mainstream brands, but high end brands, too. There has to be something there...
Until someone shows be direct evidence that Class D amps burn up subs (a glance a the technology suggests otherwise, though), I'll disregard all this as "much ado about nothing".
Until someone shows be direct evidence that Class D amps burn up subs (a glance a the technology suggests otherwise, though), I'll disregard all this as "much ado about nothing".
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From: Coal Region
Getting a system
if a class D amp provided a square wave then it would certianly kill the woofers but like luvdef said, under normal conditions i never have heard or seen this happen. also, why would most audio manufactors recommend class D amps?
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From: Cheney, Wa
Getting a system
Originally posted by optikal illushun
if a class D amp provided a square wave then it would certianly kill the woofers but like luvdef said, under normal conditions i never have heard or seen this happen. also, why would most audio manufactors recommend class D amps?
if a class D amp provided a square wave then it would certianly kill the woofers but like luvdef said, under normal conditions i never have heard or seen this happen. also, why would most audio manufactors recommend class D amps?
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