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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
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
Hi All,
I have a Panasonic SAHT670 that has worked well for quite a few years and it kinda died. The details are in my other post here "Panasonic Home theater unit - mods?" I am wondering if I just buy a new stereo amplifier and use the existing 5.1 speakers. I have 4 x 6-Ohm - 55-Watt for FR, FL, RR, RL 1 x 6-Ohm - 160-Watt Center 1 x 8-Ohm - 220-Watt Subwoofer. So here's what I am thinking and ignoring any technical rights and wrongs of mixing speaker impedance. {grin} I am not an audiophile and never have the volume cranked up high. The Stereo amp I am looking at has... 2 x 3-Ohm speaker outputs. 1 Subwoofer 1v-120K (I think it was) output. What I would like to do is serial and parallel the 5 speakers. The FR, RR and the FL, RL are easy, but the Center has two tweeters so it is important for highs I am guessing, so I would like to incorporate that too. I can get a 100-Watt plate amp and attach that to the back of the subwoofer box, so that's easy. I do not want to buy a new home theater unit as when I installed this one I made cut-outs in the walls for the speakers and all the units I have recently looked at, the speakers are too big or the price is too big for the near enough sized speakers. I looked at 5.1 amps and/or receivers and they are out of my price range right now. So any suggestions here? I am cross-posting to "sci.electronics.repair" (got yelled at here the last time I duplicated a post at "repair" and didn't cross-post instead) Hope I got it right this time. Thanks Dave |
#2
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Thu, 22 Sep 2011 08:00:10 -0700 (PDT), "Dave, I can't do that"
wrote: Hi All, I have a Panasonic SAHT670 that has worked well for quite a few years and it kinda died. The details are in my other post here "Panasonic Home theater unit - mods?" I am wondering if I just buy a new stereo amplifier and use the existing 5.1 speakers. I have 4 x 6-Ohm - 55-Watt for FR, FL, RR, RL 1 x 6-Ohm - 160-Watt Center 1 x 8-Ohm - 220-Watt Subwoofer. So here's what I am thinking and ignoring any technical rights and wrongs of mixing speaker impedance. {grin} I am not an audiophile and never have the volume cranked up high. The Stereo amp I am looking at has... 2 x 3-Ohm speaker outputs. 1 Subwoofer 1v-120K (I think it was) output. What I would like to do is serial and parallel the 5 speakers. The FR, RR and the FL, RL are easy, but the Center has two tweeters so it is important for highs I am guessing, so I would like to incorporate that too. I can get a 100-Watt plate amp and attach that to the back of the subwoofer box, so that's easy. I do not want to buy a new home theater unit as when I installed this one I made cut-outs in the walls for the speakers and all the units I have recently looked at, the speakers are too big or the price is too big for the near enough sized speakers. I looked at 5.1 amps and/or receivers and they are out of my price range right now. So any suggestions here? I am cross-posting to "sci.electronics.repair" (got yelled at here the last time I duplicated a post at "repair" and didn't cross-post instead) Hope I got it right this time. Thanks Dave Hook them up any old way. It's just audio. It doesn't matter. John |
#3
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
John Larkin wrote:
Hook them up any old way. It's just audio. It doesn't matter. Some people like the reproduced audio to sound like the original audio. -- Reply in group, but if emailing add one more zero, and remove the last word. |
#4
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Sep 22, 4:00*pm, "Dave, I can't do that"
wrote: Hi All, I have a Panasonic SAHT670 that has worked well for quite a few years and it kinda died. The details are in my other post here "Panasonic Home theater unit - mods?" I am wondering if I just buy a new stereo amplifier and use the existing 5.1 speakers. I have 4 x 6-Ohm - 55-Watt for FR, FL, RR, RL 1 x 6-Ohm - 160-Watt Center 1 x 8-Ohm - 220-Watt Subwoofer. So here's what I am thinking and ignoring any technical rights and wrongs of mixing speaker impedance. {grin} I am not an audiophile and never have the volume cranked up high. The Stereo amp I am looking at has... 2 x 3-Ohm speaker outputs. 1 Subwoofer 1v-120K (I think it was) output. What I would like to do is serial and parallel the 5 speakers. The FR, RR and the FL, RL are easy, but the Center has two tweeters so it is important for highs I am guessing, so I would like to incorporate that too. I can get a 100-Watt plate amp and attach that to the back of the subwoofer box, so that's easy. I do not want to buy a new home theater unit as when I installed this one I made cut-outs in the walls for the speakers and all the units I have recently looked at, the speakers are too big or the price is too big for the near enough sized speakers. I looked at 5.1 amps and/or receivers and they are out of my price range right now. So any suggestions here? I am cross-posting to "sci.electronics.repair" (got yelled at here the last time I duplicated a post at "repair" and didn't cross-post instead) Hope I got it right this time. Thanks Dave You could put on each of the 3 ohm channels 2x 6 ohm LSes, plus one of the tweetered 6 ohms via a capacitor. Put all 3 in parallel. It gives you 3 ohms at lf, 2-6ohms at hf, which is all good. Any modern IC output amp will protect itself if you max out the volume, and speaker impedances are only nominal, they vary quite a long way out in reality. NT |
#5
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Sep 22, 4:16*pm, NT wrote:
You could put on each of the 3 ohm channels 2x 6 ohm LSes, plus one of the tweetered 6 ohms via a capacitor. Put all 3 in parallel. It gives you 3 ohms at lf, 2-6ohms at hf, which is all good. Any modern IC output amp will protect itself if you max out the volume, and speaker impedances are only nominal, they vary quite a long way out in reality. Hi NT, thanks for that, but could I trouble you for an ASCII schematic? Or a pic of a sketch. I am not as smart as you think I am. What kind of cap, what value and voltage? If polarized, which way around? Thanks Dave |
#6
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Sep 22, 8:00*am, "Dave, I can't do that"
wrote: Hi All, I have a Panasonic SAHT670 that has worked well for quite a few years and it kinda died. The details are in my other post here "Panasonic Home theater unit - mods?" I am wondering if I just buy a new stereo amplifier and use the existing 5.1 speakers. I have 4 x 6-Ohm - 55-Watt for FR, FL, RR, RL 1 x 6-Ohm - 160-Watt Center 1 x 8-Ohm - 220-Watt Subwoofer. So here's what I am thinking and ignoring any technical rights and wrongs of mixing speaker impedance. {grin} I am not an audiophile and never have the volume cranked up high. The Stereo amp I am looking at has... 2 x 3-Ohm speaker outputs. 1 Subwoofer 1v-120K (I think it was) output. What I would like to do is serial and parallel the 5 speakers. The FR, RR and the FL, RL are easy, but the Center has two tweeters so it is important for highs I am guessing, so I would like to incorporate that too. Leave out the center channel. I don't see how you would drive it in phase given only two amplifiers. In terms of the driving amplifier, the nominal impedance applies only to the piston band region of the woofer, and only part of that. (Voice coil inductance raises driver impedance.) I can get a 100-Watt plate amp and attach that to the back of the subwoofer box, so that's easy. You can afford three channels but not four? I looked at 5.1 amps and/or receivers and they are out of my price range right now. Too bad. What I have done on a tight budget is buy pro grade equipment second-hand. |
#7
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Thu, 22 Sep 2011 16:47:48 -0400, "Tom Del Rosso"
wrote: John Larkin wrote: Hook them up any old way. It's just audio. It doesn't matter. Some people like the reproduced audio to sound like the original audio. After all the processing it's been through? John |
#8
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Sep 23, 1:41*am, David41616 wrote:
On Sep 22, 4:16*pm, NT wrote: You could put on each of the 3 ohm channels 2x 6 ohm LSes, plus one of the tweetered 6 ohms via a capacitor. Put all 3 in parallel. It gives you 3 ohms at lf, 2-6ohms at hf, which is all good. Any modern IC output amp will protect itself if you max out the volume, and speaker impedances are only nominal, they vary quite a long way out in reality. Hi NT, thanks for that, but could I trouble you for an ASCII schematic? Or a pic of a sketch. I am not as smart as you think I am. What kind of cap, what value and voltage? If polarized, which way around? Thanks Dave .. -----+-----+-----+ .. | | | .. LS LS LS .. | | | .. | | C .. | | | .. -----+-----+-----+ Cap value, if we wanted 2ohms at 1kHz so it doesnt affect the existing cap noticeably, that's 80uF. 47-100uF would be fine. Less might or might not be ok. NT |
#9
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On 9/22/2011 11:53 PM, NT wrote:
On Sep 23, 1:41 am, wrote: On Sep 22, 4:16 pm, wrote: You could put on each of the 3 ohm channels 2x 6 ohm LSes, plus one of the tweetered 6 ohms via a capacitor. Put all 3 in parallel. It gives you 3 ohms at lf, 2-6ohms at hf, which is all good. Any modern IC output amp will protect itself if you max out the volume, and speaker impedances are only nominal, they vary quite a long way out in reality. Hi NT, thanks for that, but could I trouble you for an ASCII schematic? Or a pic of a sketch. I am not as smart as you think I am. What kind of cap, what value and voltage? If polarized, which way around? Thanks Dave . -----+-----+-----+ . | | | . LS LS LS . | | | . | | C . | | | . -----+-----+-----+ Cap value, if we wanted 2ohms at 1kHz so it doesnt affect the existing cap noticeably, that's 80uF. 47-100uF would be fine. Less might or might not be ok. NT Apparently, you forgot that he requested the polarity, NT. |
#10
Posted to sci.electronics.design,sci.electronics.repair
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Mix and match speaker impedance
On Sep 23, 6:29*am, John S wrote:
On 9/22/2011 11:53 PM, NT wrote: On Sep 23, 1:41 am, *wrote: On Sep 22, 4:16 pm, *wrote: You could put on each of the 3 ohm channels 2x 6 ohm LSes, plus one of the tweetered 6 ohms via a capacitor. Put all 3 in parallel. It gives you 3 ohms at lf, 2-6ohms at hf, which is all good. Any modern IC output amp will protect itself if you max out the volume, and speaker impedances are only nominal, they vary quite a long way out in reality. Hi NT, thanks for that, but could I trouble you for an ASCII schematic? Or a pic of a sketch. I am not as smart as you think I am. What kind of cap, what value and voltage? If polarized, which way around? Thanks Dave . *-----+-----+-----+ . * * * | * * | * * | . * * *LS * *LS * *LS . * * * | * * | * * | . * * * | * * | * * C . * * * | * * | * * | . *-----+-----+-----+ Cap value, if we wanted 2ohms at 1kHz so it doesnt affect the existing cap noticeably, that's 80uF. 47-100uF would be fine. Less might or might not be ok. NT Apparently, you forgot that he requested the polarity, NT. there is no polarity for the capacitor. Do you always think people have forgotten something if they dont answer it? |
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