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"WindsorFox[SS]" wrote in message news:nrFjb.78464$AH4.70123@lakeread06... Robert Morein wrote: I concur; my opinion is expressed graphically at http://www.worldjazz.tv Yeah, but the letter colors need to be changed. What would you suggest? I didn't want to obscure the background, since that's the most interesting part of the site. |
#42
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"Ron" wrote in message ... On Wed, 15 Oct 2003 15:02:01 -0400, "Robert Morein" wrote: "Ron" wrote in message .. . On Wed, 15 Oct 2003 04:06:08 -0400, "Robert Morein" wrote: "Ron" wrote in message news On Tue, 14 Oct 2003 20:47:00 -0400, "Robert Morein" wrote: "WindsorFox[SS]" wrote in message news:Je0jb.73317$AH4.43019@lakeread06... Nexxon wrote: NEXXON_CAR_AUDIO - The Best for Less Over 19,000+ Car Audio, 7,000+ Home Electronics Products, Free Shipping Satisfaction Guaranteed, 276+ Brands, Amps, Woofers, Equalizers, CD Players, Speakers, DVD, Etc. If we don't have it - you don't want it. Please visit the website: You don't have Eclipse, that surely does not mean I do not want it. Even IF you could produce a 3000 watt amp for any price, let alone $179, exactly what automotive electrical system do you expect to power it?? Obviously there's hype in the advertising. what's 'hype' to a seller, is ripoff to a buyer. Even if that rating is for instantaneous power, the current delivered to the speakers would be 250A, meaning that the current drawn from the battery would be 360A (best case). If anyone believes this $179 amp comes even close, I have a wonderful bridge for sale. No, really... -- Ron You may be right, but there is no physical reason it can't be done. Installers frequently use multiple banks of 1 Farad capacitors to stiffen the car power. At 12V, a 1 Farad capacitor stores 12 Couloumbs of charge. A single capacitor could provide 120 amperes for 1/10 of a second. Ten capacitors could provide 120 amperes for about one second. Of course the voltage goes to zero during this interval, but it gives the idea, and the amplifier spec is for a one ohm load. Right. So, to provide 360A you would need 3.6Farad and to maintain reasonable voltage while doing so you'd need at least 10Farads. The Rockford Fosgate CPC10 1 Farad Capacitor costs about $100 each -- about $1000 for the bank to feed the $179 amp... True. And, BTW, do you really believe the $179 amp output stage is up to the task of driving 360A for 100mSec? In a design I'm working on, I'm using little International Rectifoer TO-220 MOSFETS which have an Imax of 40 amperes each. And how much are 18 of these FETs, along with the required heatsinks and mandatory protection circuit? Can you build an amp around them for $90 (so it can sell for $179)? MOSFETS don't require thermal protection, other than a thermal breaker. I paid about $4.00 each from Digikey, so I suspect the quantity price is around $0.50 each. MOSFETs are not subject to thermal runaway, but they sure require protection if you want a 350A stage to be trouble free. Putting a circuit breaker in the signal path is not a good idea, even in a $179 amplifier. However, we're getting to the nit-picking stage real fast here... I guess my point is that at this price point, it's highly likely the 3KW spec is a lie. Don't you agree with that? -- Ron You are probably right. I certainly haven't checked the car stereo scene, so I'm not informed on the level of misrepresentation out there. Personally, I long for the days when the FTC enforced brutal RMS standards. But the typical buyer in this market, who is usually a blue-collar, not terribly smart young male who is the modern version of the glass-packing hotrodder, is not really educable. It doesn't matter what we tell him; he is going to buy from this market, and be half deaf by the age of 23. It seems to me that the important thing is that during the short lifetime of his inner ear, he be made to feel as happy as possible. The principle form of protection he needs is to receive the product he ordered, and the usual 90 day warranty. Judging fraud by audiophile or engineering standards will, quite literally, fall on deaf ears. |
#43
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"Ron" wrote in message ... On Wed, 15 Oct 2003 15:02:01 -0400, "Robert Morein" wrote: "Ron" wrote in message .. . On Wed, 15 Oct 2003 04:06:08 -0400, "Robert Morein" wrote: "Ron" wrote in message news On Tue, 14 Oct 2003 20:47:00 -0400, "Robert Morein" wrote: "WindsorFox[SS]" wrote in message news:Je0jb.73317$AH4.43019@lakeread06... Nexxon wrote: NEXXON_CAR_AUDIO - The Best for Less Over 19,000+ Car Audio, 7,000+ Home Electronics Products, Free Shipping Satisfaction Guaranteed, 276+ Brands, Amps, Woofers, Equalizers, CD Players, Speakers, DVD, Etc. If we don't have it - you don't want it. Please visit the website: You don't have Eclipse, that surely does not mean I do not want it. Even IF you could produce a 3000 watt amp for any price, let alone $179, exactly what automotive electrical system do you expect to power it?? Obviously there's hype in the advertising. what's 'hype' to a seller, is ripoff to a buyer. Even if that rating is for instantaneous power, the current delivered to the speakers would be 250A, meaning that the current drawn from the battery would be 360A (best case). If anyone believes this $179 amp comes even close, I have a wonderful bridge for sale. No, really... -- Ron You may be right, but there is no physical reason it can't be done. Installers frequently use multiple banks of 1 Farad capacitors to stiffen the car power. At 12V, a 1 Farad capacitor stores 12 Couloumbs of charge. A single capacitor could provide 120 amperes for 1/10 of a second. Ten capacitors could provide 120 amperes for about one second. Of course the voltage goes to zero during this interval, but it gives the idea, and the amplifier spec is for a one ohm load. Right. So, to provide 360A you would need 3.6Farad and to maintain reasonable voltage while doing so you'd need at least 10Farads. The Rockford Fosgate CPC10 1 Farad Capacitor costs about $100 each -- about $1000 for the bank to feed the $179 amp... True. And, BTW, do you really believe the $179 amp output stage is up to the task of driving 360A for 100mSec? In a design I'm working on, I'm using little International Rectifoer TO-220 MOSFETS which have an Imax of 40 amperes each. And how much are 18 of these FETs, along with the required heatsinks and mandatory protection circuit? Can you build an amp around them for $90 (so it can sell for $179)? MOSFETS don't require thermal protection, other than a thermal breaker. I paid about $4.00 each from Digikey, so I suspect the quantity price is around $0.50 each. MOSFETs are not subject to thermal runaway, but they sure require protection if you want a 350A stage to be trouble free. Putting a circuit breaker in the signal path is not a good idea, even in a $179 amplifier. However, we're getting to the nit-picking stage real fast here... I guess my point is that at this price point, it's highly likely the 3KW spec is a lie. Don't you agree with that? -- Ron You are probably right. I certainly haven't checked the car stereo scene, so I'm not informed on the level of misrepresentation out there. Personally, I long for the days when the FTC enforced brutal RMS standards. But the typical buyer in this market, who is usually a blue-collar, not terribly smart young male who is the modern version of the glass-packing hotrodder, is not really educable. It doesn't matter what we tell him; he is going to buy from this market, and be half deaf by the age of 23. It seems to me that the important thing is that during the short lifetime of his inner ear, he be made to feel as happy as possible. The principle form of protection he needs is to receive the product he ordered, and the usual 90 day warranty. Judging fraud by audiophile or engineering standards will, quite literally, fall on deaf ears. |
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