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I know DEAD HORSE.. but if you feel like it,.. Help me with Class A/B vs Class D.
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<blockquote data-quote="Chromatic" data-source="post: 8221061" data-attributes="member: 659121"><p>Read you two guys debate over the A/B v D.. First bbeljefe has been very tactful in his choice of phrasing,.. indicating that he thinks a $200 ish Class D amp... (most people) aren't going to hear a noticeable difference in say a comparable Class A/B amp that may be another $100 or so. BUT, says some people just might. He, nor I, are disagreeing with the likliehood that some people (not the majority, imo), do hear a large difference between them. But, for a mid range budget build.. say keeping it under $1000 on parts.. Class D really offers advantages.</p><p></p><p>The smaller form factor and cooler running can't be dismissed. My setup sounds absolutely amazing with the PPI 900.5 Class D amp. I don't regret buying it one bit.</p><p></p><p>I don't think anyone here is really arguing any definitive stance.. ie: Class D = A/B in quality no questions asked.. and anyone who says otherwise is experiencing a placebo effect //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif -- A/B is technically a cleaner amp .. If you buy a decent one as goes with all equipment. BUT,.. just there mere fact that Class D tech has been around for a while now.. it's improved every 6months or so as new tech does.. given it's switching tech, and internals that involve processing there is a lot of room for improvement, and many improvements have been made by leaps and bounds since they were introduced due to our advanced knowledge with this technology already. I do think they are the future for your low to mid range install.. and who knows.. D amp tech. may become "good enough" to rival the high end A/B amps.. time will tell.</p><p></p><p>Speaking of Class D. My PPI 900.5, Class D amp -- I'm curious at what point I need to do something about active cooling where it's located. A big reason for the class D amp was because it runs cooler than A/B.. I put it in an enclosed (no ventilation) area.. and after watching a Movie in my car (parked) for 2 hours .. (I was just testing the DVD player and got hooked on the movie.. go figure.) -- The Amp was quite hot to the touch. Not too hot to keep my hand on the amp.. but quite hot.</p><p></p><p>At what point in amp temp (by feel) do I need to try to figure out taking more of the car apart and running some sort of fan setup in that compartment.</p><p></p><p>I'm hoping the answer is, your amp being Class D is fine at those temps.. and don't worry about it. I Just don't know what's dangerous, or normal for the Class D PPI 900.5 amp in terms of how hot it gets.</p><p></p><p>Here's the amp again in it's location:</p><p></p><p><a href="http://www.flickr.com/photos/111739693@N04/11957798716/" target="_blank"><img src="http://farm3.staticflickr.com/2818/11957798716_46095a42d0.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>That Door you see closes, and stays closed. Hence no air flow -- Just to be thorough here it is closed:</p><p></p><p><a href="http://www.flickr.com/photos/111739693@N04/11956975045/" target="_blank"><img src="http://farm4.staticflickr.com/3678/11956975045_a7bd9ff610.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>I know how to cool things.. I design computer systems,.. and cooling is a big part of it with some of the higher end stuff I design. But I really don't want to even run another thing to it if things are ok as they are. Not out of laziness so much, but because I don't want to introduce anymore current draws (I know the fan(s) I'd use would be 0.12amps or something similarly as small..) but if I went in to "cool" it (which was a large reason to buy that D amp instead of A/B in the first place) I'd be hacking up that door and probably putting a large 200mm or large fan at low rpm to push air in there mounted INTO that door.</p><p></p><p>Come on.. please tell me it's normal for that amp to get fairly hot to the touch.. (again, hot after 2+ hours of being on... put I could keep my hand on it without pulling it off, if that gives you any gauge of the heat.)</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="Chromatic, post: 8221061, member: 659121"] Read you two guys debate over the A/B v D.. First bbeljefe has been very tactful in his choice of phrasing,.. indicating that he thinks a $200 ish Class D amp... (most people) aren't going to hear a noticeable difference in say a comparable Class A/B amp that may be another $100 or so. BUT, says some people just might. He, nor I, are disagreeing with the likliehood that some people (not the majority, imo), do hear a large difference between them. But, for a mid range budget build.. say keeping it under $1000 on parts.. Class D really offers advantages. The smaller form factor and cooler running can't be dismissed. My setup sounds absolutely amazing with the PPI 900.5 Class D amp. I don't regret buying it one bit. I don't think anyone here is really arguing any definitive stance.. ie: Class D = A/B in quality no questions asked.. and anyone who says otherwise is experiencing a placebo effect [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] -- A/B is technically a cleaner amp .. If you buy a decent one as goes with all equipment. BUT,.. just there mere fact that Class D tech has been around for a while now.. it's improved every 6months or so as new tech does.. given it's switching tech, and internals that involve processing there is a lot of room for improvement, and many improvements have been made by leaps and bounds since they were introduced due to our advanced knowledge with this technology already. I do think they are the future for your low to mid range install.. and who knows.. D amp tech. may become "good enough" to rival the high end A/B amps.. time will tell. Speaking of Class D. My PPI 900.5, Class D amp -- I'm curious at what point I need to do something about active cooling where it's located. A big reason for the class D amp was because it runs cooler than A/B.. I put it in an enclosed (no ventilation) area.. and after watching a Movie in my car (parked) for 2 hours .. (I was just testing the DVD player and got hooked on the movie.. go figure.) -- The Amp was quite hot to the touch. Not too hot to keep my hand on the amp.. but quite hot. At what point in amp temp (by feel) do I need to try to figure out taking more of the car apart and running some sort of fan setup in that compartment. I'm hoping the answer is, your amp being Class D is fine at those temps.. and don't worry about it. I Just don't know what's dangerous, or normal for the Class D PPI 900.5 amp in terms of how hot it gets. Here's the amp again in it's location: [URL="http://www.flickr.com/photos/111739693@N04/11957798716/"][IMG]http://farm3.staticflickr.com/2818/11957798716_46095a42d0.jpg[/IMG][/URL] That Door you see closes, and stays closed. Hence no air flow -- Just to be thorough here it is closed: [URL="http://www.flickr.com/photos/111739693@N04/11956975045/"][IMG]http://farm4.staticflickr.com/3678/11956975045_a7bd9ff610.jpg[/IMG][/URL] I know how to cool things.. I design computer systems,.. and cooling is a big part of it with some of the higher end stuff I design. But I really don't want to even run another thing to it if things are ok as they are. Not out of laziness so much, but because I don't want to introduce anymore current draws (I know the fan(s) I'd use would be 0.12amps or something similarly as small..) but if I went in to "cool" it (which was a large reason to buy that D amp instead of A/B in the first place) I'd be hacking up that door and probably putting a large 200mm or large fan at low rpm to push air in there mounted INTO that door. Come on.. please tell me it's normal for that amp to get fairly hot to the touch.. (again, hot after 2+ hours of being on... put I could keep my hand on it without pulling it off, if that gives you any gauge of the heat.) Thanks [/QUOTE]
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I know DEAD HORSE.. but if you feel like it,.. Help me with Class A/B vs Class D.
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