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Quote:
Originally Posted by djbluemax1 
BTW, that's also the reason why it's possible to run 2 SubM HP's on a single 15 amp circuit, even though the SubM HP's amps are rated for 2400 watts each. In theory, that could place a 40amp draw on the circuit (2400 watts/120 volts = 20 amps per subwoofer). The amps can store power for the high demand sections (according to Mark, IIRC, something like 15-20 seconds of power reserve at maximum load/draw?). In general though, even the HP's only draw maybe 800 watts each when run at Reference for dynamic/loud material, which is why it's possible to run 2 of them on a circuit that in theory, should only be able to provide 1800 watts.
Max
P.S. I can't remember which thread it was in but Beeman whatsisname was telling folks that they need to upgrade the wiring in their house because the huge draw from modern HT setups places so much demand on the circuits and wiring that it would likely burn their houses down eventually. Using a Belkin PF60 that has a current draw meter and a source voltage meter, I've monitored the partial draw from my HT system at full chat in some of the loudest movie passages at Reference (partial draw because I've divided my HT draw between 3 separate 15 amp circuits, because I can and HAVE tripped the breakers at Reference when putting everything on just 2x15amp circuits.)
Yes, at full chat, my HT setups can draw a LOT of power (sorry greenies, THX Reference HT isn't very green), but most of the time it's coasting. At full chat, part of the system can draw enough from one circuit to cause voltage sag from the usual 120 volts at the wall down to 114 volts for short periods. The reason it's silly to say that HT's draw more power than the circuits were designed to handle is because that poster has NO idea how wiring code is set up. The draw from ONE space heater (the Dyson Hot, which works very well I might add), causes the voltage to sag down to 114 volts the entire time it's running. Plugging an electric iron into a socket does the same thing for one 15 amp circuit, and as I said, this is constant draw vs the occasional draw with an HT system.
In addition, the guy obviously isn't familiar with the concept of circuit breakers and how they're designed to trip if anything tries to draw more power through the circuit than it was designed for. I can attest that the system works fine as I've tripped my breakers more than once (without burning the house down) till I figured out how many circuits I needed to run the whole system at Reference.
Quote:
Keith, that's what the huge bank of capacitors in the Emo amps is for, to provide the potentially huge current demands for transients. Although it's true that some power conditioners/surge suppressors can limit the current to huge draw devices, it's generally not a problem for anything that's decently designed. They CAN limit the maximum available inrush current for things with large electric motors though, but the highest draw items in an HT setup are the amps, and as mentioned, they use banks of capacitors to store power for those high demand transients, and most of the time, they continual draw from the source is enough to keep everything running just fine. If you have something like a Kill-A-Watt or another device that can measure current draw of the appliances hooked up to it, you'll see that even amps don't really draw a whole lot of current all the time.Originally Posted by kbarnes701
So no need for me to be paranoid about limiting the current to my amps?
Quote:
Originally Posted by Selden Ball
Some power strips include in-line inductors to reduce the amount of high-frequency noise which can be transmitted from one device to another over the power lines. As a result, they reduce the amount of high-frequency current. I don't know about you, but I want that noise filtration in my system. Some people like to claim that inline inductors also reduce the power available for the transient peaks in sound tracks. I don't agree with this. The capacitors in the power supplies provide the power needed for those transients.
Some power strips include in-line inductors to reduce the amount of high-frequency noise which can be transmitted from one device to another over the power lines. As a result, they reduce the amount of high-frequency current. I don't know about you, but I want that noise filtration in my system. Some people like to claim that inline inductors also reduce the power available for the transient peaks in sound tracks. I don't agree with this. The capacitors in the power supplies provide the power needed for those transients.
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Originally Posted by Theresa
My experience with surge protecting power strips is that they will pass as much current as their circuit breaker allows, even to the point of melting.
My experience with surge protecting power strips is that they will pass as much current as their circuit breaker allows, even to the point of melting.
So no need for me to be paranoid about limiting the current to my amps?
BTW, that's also the reason why it's possible to run 2 SubM HP's on a single 15 amp circuit, even though the SubM HP's amps are rated for 2400 watts each. In theory, that could place a 40amp draw on the circuit (2400 watts/120 volts = 20 amps per subwoofer). The amps can store power for the high demand sections (according to Mark, IIRC, something like 15-20 seconds of power reserve at maximum load/draw?). In general though, even the HP's only draw maybe 800 watts each when run at Reference for dynamic/loud material, which is why it's possible to run 2 of them on a circuit that in theory, should only be able to provide 1800 watts.
Max
P.S. I can't remember which thread it was in but Beeman whatsisname was telling folks that they need to upgrade the wiring in their house because the huge draw from modern HT setups places so much demand on the circuits and wiring that it would likely burn their houses down eventually. Using a Belkin PF60 that has a current draw meter and a source voltage meter, I've monitored the partial draw from my HT system at full chat in some of the loudest movie passages at Reference (partial draw because I've divided my HT draw between 3 separate 15 amp circuits, because I can and HAVE tripped the breakers at Reference when putting everything on just 2x15amp circuits.)
Yes, at full chat, my HT setups can draw a LOT of power (sorry greenies, THX Reference HT isn't very green), but most of the time it's coasting. At full chat, part of the system can draw enough from one circuit to cause voltage sag from the usual 120 volts at the wall down to 114 volts for short periods. The reason it's silly to say that HT's draw more power than the circuits were designed to handle is because that poster has NO idea how wiring code is set up. The draw from ONE space heater (the Dyson Hot, which works very well I might add), causes the voltage to sag down to 114 volts the entire time it's running. Plugging an electric iron into a socket does the same thing for one 15 amp circuit, and as I said, this is constant draw vs the occasional draw with an HT system.
In addition, the guy obviously isn't familiar with the concept of circuit breakers and how they're designed to trip if anything tries to draw more power through the circuit than it was designed for. I can attest that the system works fine as I've tripped my breakers more than once (without burning the house down) till I figured out how many circuits I needed to run the whole system at Reference.
Max - great post and I thank you for taking the time to explain it in detail. As I'm sure you know, the UK mains voltage is 240v so we have some extra latitude in our circuits compared with you 120v guys. I do have a Kill-A-Watt (style) meter and it records the maximum current drawn between resets and I have never seen my HT gear draw more than 10 amps of my available 13, even when running at full chat for a few hours. Usually it draws around 7 amps.
