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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Paralleled Amplifier Wiring
Hi,
I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? thanks, jamie. -- PS. If your name is Dave Plowman, do not reply. |
#2
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Paralleled Amplifier Wiring
"j r powell" wrote in message ... Hi, I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? thanks, jamie. -- PS. If your name is Dave Plowman, do not reply. How very rude ... d :-\ Arfa |
#3
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Paralleled Amplifier Wiring
"j r powell" wrote in message ... Hi, I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? thanks, jamie. -- PS. If your name is Dave Plowman, do not reply. How very rude ... d :-\ Arfa |
#4
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Paralleled Amplifier Wiring
"Arfa Daily" wrote in message news:KHL1o.42481$AS4.24133@hurricane... "j r powell" wrote in message ... Hi, I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? thanks, jamie. -- PS. If your name is Dave Plowman, do not reply. How very rude ... d :-\ Well... he follows me around usenet and trolls me. |
#5
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Paralleled Amplifier Wiring
On 7/21/2010 6:55 AM j r powell spake thus:
I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? Have you tried simply using a pair of 8-ohm speakers with the amp? Chances are they'd work (less power, but shouldn't harm the amp). -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) |
#6
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Paralleled Amplifier Wiring
"David Nebenzahl" wrote in message .com... Have you tried simply using a pair of 8-ohm speakers with the amp? Chances are they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. |
#7
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Paralleled Amplifier Wiring
Have you tried simply using a pair of 8-ohm speakers
with the amp? Chances are they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. |
#8
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Paralleled Amplifier Wiring
"William Sommerwerck" wrote in message ... Have you tried simply using a pair of 8-ohm speakers with the amp? Chances are they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. |
#9
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Paralleled Amplifier Wiring
Have you tried simply using a pair of 8-ohm speakers
with the amp? Chances are they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. No, it isn't. Not when it requires a lot of work, and will be only slightly audible. "Forget about the whole thing." -- The Lady from Philadelphia |
#10
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Paralleled Amplifier Wiring
"William Sommerwerck" wrote in message ... Have you tried simply using a pair of 8-ohm speakers with the amp? Chances are they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. No, it isn't. Not when it requires a lot of work, and will be only slightly audible. Fitting resistors is hardly a lot of work. I just need someone who knows their stuff, to answer my original question. |
#11
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Paralleled Amplifier Wiring
On 7/21/2010 6:10 PM j r powell spake thus:
"William Sommerwerck" wrote in message ... I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. No, it isn't. Not when it requires a lot of work, and will be only slightly audible. Fitting resistors is hardly a lot of work. I just need someone who knows their stuff, to answer my original question. So, William, what is the correct answer here (value of resistors)? I'm curious now, too. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) |
#12
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Paralleled Amplifier Wiring
I'm not being sarcastic -- but how do you know that paralleling the
outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. No, it isn't. Not when it requires a lot of work, and will be only slightly audible. Fitting resistors is hardly a lot of work. I just need someone who knows their stuff, to answer my original question. So, William, what is the correct answer here (value of resistors)? I'm curious now, too. I don't see where I'm obliged to provide an answer, but here's what I believe, to the best of my understanding... Assuming that both channels have the same output impedance, and the output levels are closely matched, then (if the outputs are directly paralleled) there will be /no/ current flow from one channel into the other, and the total amount of current that /could/ be delivered will be doubled. But if the load impedance remains the same, there will be no increase in current flow and no increase in volume level. You would need a speaker of half the impedance to gain more power. I think that's correct. Anybody want to agree or disagree? |
#13
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Paralleled Amplifier Wiring
"William Sommerwerck" wrote in message ... I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. No, it isn't. Not when it requires a lot of work, and will be only slightly audible. Fitting resistors is hardly a lot of work. I just need someone who knows their stuff, to answer my original question. So, William, what is the correct answer here (value of resistors)? I'm curious now, too. I don't see where I'm obliged to provide an answer, but here's what I believe, to the best of my understanding... Assuming that both channels have the same output impedance, and the output levels are closely matched, then (if the outputs are directly paralleled) there will be /no/ current flow from one channel into the other, and the total amount of current that /could/ be delivered will be doubled. But if the load impedance remains the same, there will be no increase in current flow and no increase in volume level. You would need a speaker of half the impedance to gain more power. I think that's correct. Anybody want to agree or disagree? Well, you sure don't want to use resistors to match it. Any gain would just be converted to heat. ASSuming the impedance's were the same and you paralleled the outputs, you would need a 1.5 to 8 ohm transformer to match the speaker. But I agree with the first premise, it's hardly worth the 3 dB you might gain. T --- news://freenews.netfront.net/ - complaints: --- |
#14
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Paralleled Amplifier Wiring
On Jul 21, 5:56*pm, "j r powell" wrote:
"William Sommerwerck" wrote in message ... Have you tried simply using a pair of 8-ohm speakers with the amp? Chances are *they'd work (less power, but shouldn't harm the amp). I have, but then the audio output is too quiet for my requirements. I'm not being sarcastic -- but how do you know that paralleling the outputs will produce a significant increase in power? Ignoring the very pertinent question of how to do this /correctly/, the most you could get is a 3dB increase, which is plainly audible, but hardly a large increase. A small increase is better than nothing. The increase will be 0. Changing from 4 ohms to 8 will cut the power in half because the voltage stayed the same and the current cut in half because of the impedance change. Paralleling the amps raises current capacity - which you don't need - and does nothing to increase the voltage. In fact, your resistors will reduce it slightly. You need a bigger amp. G² |
#15
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Paralleled Amplifier Wiring
"j r powell" I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. ** The only way to go here is to use "bridge mode". Parallel wiring of the outputs is not only 100% useless it will almost certainly destroy both amplifier channels. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, ** Complete crap. There is such of lot of it on the net you know. ..... Phil |
#16
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Paralleled Amplifier Wiring
I made a mistake -- for some reason I assumed this was a tube amp. (I don't
know why.) Regardless, if the output levels are closely matched, one amp /will not/ pump current into the other. But to gain any increase in power, you'd have to use a lower-impedance speaker. There is also the possibility that, even with the levels matched, the amps might not "like" looking at each other. "Buy a decent amplifier that delivers the power you need." -- The Lady from Philadelphia |
#17
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Paralleled Amplifier Wiring
On Jul 21, 7:28*pm, "William Sommerwerck"
wrote: I made a mistake -- for some reason I assumed this was a tube amp. (I don't know why.) Regardless, if the output levels are closely matched, one amp /will not/ pump current into the other. But to gain any increase in power, you'd have to use a lower-impedance speaker. You are VERY WRONG on this. There is also the possibility that, even with the levels matched, the amps might not "like" looking at each other. Virtually a certainty. "Buy a decent amplifier that delivers the power you need." -- The Lady from Philadelphia This is good advice. G² |
#18
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Paralleled Amplifier Wiring
Regardless, if the output levels are closely matched, one amp /will
not/ pump current into the other. But to gain any increase in power, you'd have to use a lower-impedance speaker. You are VERY WRONG on this. Why? You haven't changed the output voltage. If the amps are solid state, their source impedance is much lower than that of the load, so there wouldn't be any significant increase in current flow (that I know). |
#19
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Paralleled Amplifier Wiring
On Wed, 21 Jul 2010 18:53:58 -0700, William Sommerwerck wrote:
- snippage- Assuming that both channels have the same output impedance, and the output levels are closely matched, .. and, assuming both outputs are _exactly_ in phase, then (if the outputs are directly paralleled) there will be /no/ current flow from one channel into the other, .... Jonesy |
#20
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Paralleled Amplifier Wiring
On Jul 21, 6:55 am, "j r powell" wrote:
I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, The power limit might not be the amplifier output stages, but the common power supply. So, you'd just connect to the left channel and ignore the other. Alternately, you could transformer-couple and put the left and right channel outputs in series (not parallel), to get good drive into an 8 ohm speaker. Transformers, though, aren't cheap. Doing this only gains you 3 dB, it's scarcely worth the effort. More efficient speakers (two of 'em, not one) is the preferred solution if you don't like what you've got. |
#21
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Paralleled Amplifier Wiring
On Jul 22, 5:00*am, "William Sommerwerck"
wrote: Regardless, if the output levels are closely matched, one amp / will not/ pump current into the other. But to gain any increase in power, you'd have to use a lower-impedance speaker. You are VERY WRONG on this. Why? You haven't changed the output voltage. If the amps are solid state, their source impedance is much lower than that of the load, so there wouldn't be any significant increase in current flow (that I know). If the output voltage is _slightly_ not matched, each amp will attempt to correct it and push large currents into each other. HEAT. BANG. G² |
#22
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Paralleled Amplifier Wiring
In article , "j r powell" wrote:
Hi, I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers. I'd like to combine the two channels of the amp in order to drive one, slightly larger, 8ohm 4watt speaker. The amp is of the non-bridgeable type, so I assume parallel wiring would be required - combining the two outputs together. I have read that small resistors are required in parallel configuration, to enable proper current sharing between the amplifiers, as without them the two amps would fight each other and overheat. Can anyone tell me the correct values for these resistors, and where they should be placed? thanks, jamie. You forgot to give the power. From quick reading of posts, to get more sound you can put 2- 8 ohm speakers in parallel which will give 6 db increase over one 8 ohm. You can bridge, say put 1-2 ohm resistors in series with the speaker and use a bridge transformer on the input. If you gave the minimum ohm spec of the amp, I could be more specific. You also did not specify the output type if the amplifier. Are the channels allready bridged ? greg |
#23
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Paralleled Amplifier Wiring
"Greg ****head" You forgot to give the power. ** It in the very first line of the original post. You pathetic imbecile. .... Phil |
#24
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Paralleled Amplifier Wiring
In article , "Phil Allison" wrote:
"Greg ****head" You forgot to give the power. ** It in the very first line of the original post. You pathetic imbecile. .... Phil Reading......... I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers Still reading......................................... How tiny? What color ?? greg |
#25
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Paralleled Amplifier Wiring
"Greg the trolling ****head"
You forgot to give the power. ** It in the very first line of the original post. You pathetic imbecile. I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers ** Wot a pathetic moron.... .... Phil |
#26
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Paralleled Amplifier Wiring
Phil Allison wrote: ** Wot a pathetic moron.... ...and you'll never change. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge. |
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