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#1
Posted to rec.audio.high-end
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Bridge Amplifier
Hi friends . I am using 3055 amp in bridge configuration i.e. using two
channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? |
#2
Posted to rec.audio.high-end
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Bridge Amplifier
In article ,
"sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac |
#3
Posted to rec.audio.high-end
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Bridge Amplifier
isw wrote:
In article , "sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac I would add that as the combination delivers four times the power, each half sees half the impedance, so an 8 ohm 'speaker will look like 4 ohms to each half of the bridge. So, provided the two amps are happy driving the load, there's no problem. Note also that you can't ground one side of the load. Although that's obvious, you'd be surprised how many times people have done that and wondered why their amp shut down or blew up.......... Bridging is a very useful technique, I've used it myself for the same application in a single subwoofer, with complete success. S. |
#4
Posted to rec.audio.high-end
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Bridge Amplifier
On 10 Jan 2007 00:12:27 GMT, "sahil" wrote:
Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? In most cases, and clearly this one, you're doubling the signal path by using a stereo amp in bridged mono mode. My McIntosh amps never sounded as good in bridged mono as they did in discreet stereo. Additional power notwithstanding. VoH |
#5
Posted to rec.audio.high-end
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Bridge Amplifier
"sahil" wrote in message
... Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? If an amplifier is capable of almost twice the power into a 4 ohm load as it is into an 8 ohm load--and your load is actually 8 ohms--then connecting 2 such amplifiers in a bridge configuration will result in 4 times the power output of a single amp. Unless your amplifiers are designed for bridge operation, I wouldn't recommend connecting them that way. Norm Strong |
#6
Posted to rec.audio.high-end
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Bridge Amplifier
In article ,
Serge Auckland wrote: isw wrote: In article , "sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac I would add that as the combination delivers four times the power, each half sees half the impedance, so an 8 ohm 'speaker will look like 4 ohms to each half of the bridge. And that is exactly *why* it delivers four times the power. Isaac |
#7
Posted to rec.audio.high-end
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Bridge Amplifier
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#8
Posted to rec.audio.high-end
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Bridge Amplifier
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#9
Posted to rec.audio.high-end
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Bridge Amplifier
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#10
Posted to rec.audio.high-end
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Bridge Amplifier
sahil wrote:
Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Bridging two channels with cheap devices has monetary merit. I used to do it just for that reason. It used to be the HV devices were much more expensive than the low voltage devices. Bridging has the ability to provide more output at less distortion if done right. Everything can be balanced, including the power supply. When you build a bridged amp, you can design for 4 times the power, but rarely is this possible with using typical stereo amps, because of limitations on current and heat removal. I claim it possible to get less distortion by bridging, but I have not been able to convince anyone except myself. When you bridge, it best to take the OUTPUT of one side, reverse it, and form the difference channel from that. greg |
#11
Posted to rec.audio.high-end
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Bridge Amplifier
isw wrote:
In article , Serge Auckland wrote: isw wrote: In article , "sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac I would add that as the combination delivers four times the power, each half sees half the impedance, so an 8 ohm 'speaker will look like 4 ohms to each half of the bridge. And that is exactly *why* it delivers four times the power. No, it's because bridging doubles the avilable voltage swing and mathematically, doubling the voltage quadruples the power. That is theory. The fact that each amplifier sees half the load impedance actually drags down the power supply a bit, so the voltage swing is actually somewhat less than double, the amount depending on the load regulation of the particular supply. P=VI (now, algebraically rewrite that in all the possible ways) |
#12
Posted to rec.audio.high-end
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Bridge Amplifier
zekor wrote:
sahil wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Bridging two channels with cheap devices has monetary merit. I used to do it just for that reason. It used to be the HV devices were much more expensive than the low voltage devices. Bridging has the ability to provide more output at less distortion if done right. Everything can be balanced, including the power supply. When you build a bridged amp, you can design for 4 times the power, but rarely is this possible with using typical stereo amps, because of limitations on current and heat removal. I claim it possible to get less distortion by bridging, but I have not been able to convince anyone except myself. When you bridge, it best to take the OUTPUT of one side, reverse it, and form the difference channel from that. greg I think the best way of deriving a difference channel for bridging is to use a balanced output driver, or transformer. Taking the output of one side as suggested *can* of course work, and probably will perfectly well for modern Solid State amplifiers, but could be more risky with valve amplifiers if the phase shift at high frequencies becomes significant. S. |
#13
Posted to rec.audio.high-end
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Bridge Amplifier
isw wrote:
In article , Serge Auckland wrote: isw wrote: In article , "sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac I would add that as the combination delivers four times the power, each half sees half the impedance, so an 8 ohm 'speaker will look like 4 ohms to each half of the bridge. And that is exactly *why* it delivers four times the power. Isaac Of course it is, but my point was that it delivers four times the power as each amplifier is driving into half the load impedance. Some amps may be unhappy driving four ohms, or even two ohms if the 'speaker load is 4 ohms. Bridging is an extremely useful technique, provided you know what load you're driving. S. |
#14
Posted to rec.audio.high-end
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Bridge Amplifier
Serge Auckland wrote:
isw wrote: In article , Serge Auckland wrote: isw wrote: In article , "sahil" wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? Using two identical amps in a bridge will deliver four times the power into the same speaker (compared to one of the amps). That's about it... Isaac I would add that as the combination delivers four times the power, each half sees half the impedance, so an 8 ohm 'speaker will look like 4 ohms to each half of the bridge. And that is exactly *why* it delivers four times the power. Isaac Of course it is, but my point was that it delivers four times the power as each amplifier is driving into half the load impedance. Some amps may be unhappy driving four ohms, or even two ohms if the 'speaker load is 4 ohms. Bridging is an extremely useful technique, provided you know what load you're driving. S. Thanks a lot to everyone for providing me this valuable information. thanks again. |
#15
Posted to rec.audio.high-end
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Bridge Amplifier
sahil wrote:
Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? merit: more power demerit: more complicated to set up, you can blow things up if you do it wrong, more expensive, mostly unnecessary Back in the day when owning a 15 watt amp meant you were a somebody, bridging was one of the few options to get more power. It still is a way to get more power, but given the availability of high power amps it's more trouble than it's worth. If you're running stereo, it cheaper to buy a larger stero amp than it is to buy two lower-powered units and bridge them. The main application I would see is if you are running a mono subwoofer and using a stereo amp, you might as well bridge it for more power. Other than that, it's probably tweaking for tweaking sake. //Walt |
#16
Posted to rec.audio.high-end
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Bridge Amplifier
In article ,
Walt wrote: sahil wrote: Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? merit: more power demerit: more complicated to set up, you can blow things up if you do it wrong, more expensive, mostly unnecessary Back in the day when owning a 15 watt amp meant you were a somebody, bridging was one of the few options to get more power. It still is a way to get more power, but given the availability of high power amps it's more trouble than it's worth. If you're running stereo, it cheaper to buy a larger stero amp than it is to buy two lower-powered units and bridge them. The main application I would see is if you are running a mono subwoofer and using a stereo amp, you might as well bridge it for more power. Other than that, it's probably tweaking for tweaking sake. Actually, the main application is when you need more power than your (fixed) voltage source is capable of delivering into the load impedance you're stuck with. Consider running a high(er)-powered audio system from a 12-volt auto battery, for example. The other alternative, a switch-mode up-converting power supply, is probably considerably more expensive. Isaac |
#17
Posted to rec.audio.high-end
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Bridge Amplifier
isw wrote:
Walt wrote: sahil wrote: .Can anybody tell me what r the merits and demerits of bridge configuration? The main application I would see is if you are running a mono subwoofer and using a stereo amp, you might as well bridge it for more power. Other than that, it's probably tweaking for tweaking sake. Actually, the main application is when you need more power than your (fixed) voltage source is capable of delivering into the load impedance you're stuck with. Consider running a high(er)-powered audio system from a 12-volt auto battery, for example. The other alternative, a switch-mode up-converting power supply, is probably considerably more expensive. I wasn't thinking about car stereo, but you are correct that when you've got 12 volts DC as a power source, bridging the amps starts to look mighty attractive. But with car stereos this is usually done for you by the unit itself - at least it is in my car. No futzing with two amps and inverting the polarity of one and hooking the speaker leads to the two red outputs, just connect the speaker to the output. //Walt |
#18
Posted to rec.audio.high-end
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Bridge Amplifier
sahil schrieb:
Hi friends . I am using 3055 amp in bridge configuration i.e. using two channels amp to drive one woofer..Can anybody tell me what r the merits and demerits of bridge configuration? What is a 3055 amp? Have you got two of them? I used to run my Proac 3.5 with two Jeff Rowland Model 1. After comparison I chose just one unbridged channel per amp and not the bridged variety. To my ears, it sounded cleaner, therefore better (more bass control). Is it true that besides quadrupling the power you get a better slew rate but have to trade in half the damping factor? Anyway, what will really get you somewhere is biamping instead of bridging (your speakers must have 4 binding posts and your preamp output must be configured appropriately. Even better still would be an active crossover between preamp and amps, but this takes good knowledge of your speaker´s passive crossover measurements which might or might not be provided by the manufacturer. And you would have to throw out the passive crossover. Charlie (pardon my English) |
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