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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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Speaker line characteristics
This question was posed on another group but wasn't really answered.
There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? Thanks, Lenny |
#2
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Speaker line characteristics
klem kedidelhopper wrote: This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? Thanks, Lenny How are the other zones wired? |
#3
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Speaker line characteristics
"klem kedidelhopper" This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? ** One only has to add say a 100 ohm resistor in series with the speaker - if the level drops dramatically it is 8 ohms. An impedance meter is invaluable when troubleshooting line voltage PA systems - but even that will not tell you if a line matching tranny is 70 V .. ..... Phil |
#4
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Speaker line characteristics
Phil Allison wrote: "klem kedidelhopper" This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? ** One only has to add say a 100 ohm resistor in series with the speaker - if the level drops dramatically it is 8 ohms. An impedance meter is invaluable when troubleshooting line voltage PA systems - but even that will not tell you if a line matching tranny is 70 V Sigh. |
#5
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Speaker line characteristics
"Michael A. Terrell" Phil Allison wrote: "klem kedidelhopper" This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? ** One only has to add say a 100 ohm resistor in series with the speaker - if the level drops dramatically it is 8 ohms. An impedance meter is invaluable when troubleshooting line voltage PA systems - but even that will not tell you if a line matching tranny is 70 V Sigh. ** ROTFL !! The Terrell ****wit retard has MISREAD my post - as always. The "you" in my final sentence above refers to OP's problem - ie testing just the speaker line with no ability to inspect the tranny or speaker. ..... Phil |
#6
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Speaker line characteristics
Phil Allison wrote: "Michael A. Terrell" ? Phil Allison wrote: ?? "klem kedidelhopper" ?? ?? ? This question was posed on another group but wasn't really answered. ?? ? There is a PA installation with several zones . One zone is a bell ?? ? tower which has a separate speaker in it. The speaker is inaccessible. ?? ? The DC resistance of that line is 11 ohms. How can an installer ?? ? determine if this is a 70, or 25 volt speaker and which tap it may be ?? ? set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable ?? ? resistance added? Is there n easy way to do this without an impedance ?? ? bridge? ?? ?? ** One only has to add say a 100 ohm resistor in series with the ?? speaker - ?? if the level drops dramatically it is 8 ohms. ?? ?? An impedance meter is invaluable when troubleshooting line voltage PA ?? systems - but even that will not tell you if a line matching tranny is 70 ?? V ? ? ? Sigh. ** ROTFL !! The Terrell ****wit retard has MISREAD my post - as always. The "you" in my final sentence above refers to OP's problem - ie testing just the speaker line with no ability to inspect the tranny or speaker. Keep backpedaling, loser. Your inability to think is well known. |
#7
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Speaker line characteristics
"Michael A. Terrell Autistic Retard " ( snip pile of utter ****) ** **** off to hell - you rabid, lunatic, ****wit TROLL |
#8
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Speaker line characteristics
Phil Allison wrote: "Michael A. Terrell Autistic Retard " ( snip pile of utter ****) ** **** off to hell - you rabid, lunatic, ****wit TROLL I keep telling you, I'm not into guys. |
#9
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Speaker line characteristics
"Michael A. Terrell Autistic Retard " ** **** off to hell - you rabid, lunatic, ****wit TROLL I keep telling you, I'm not into guys. ** Only quadrupeds - with big ears. |
#10
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Speaker line characteristics
Phil Allison wrote: "Michael A. Terrell Autistic Retard " ** **** off to hell - you rabid, lunatic, ****wit TROLL I keep telling you, I'm not into guys. ** Only quadrupeds - with big ears. No thanks. Keep your perverted fantasies to yourself. |
#11
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Speaker line characteristics
klem kedidelhopper wrote: This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? Thanks, Lenny Here is the schematic for an old TOA analog impedance meter. It should be fairly easy to build one from what's laying around the shop. the only part I haven't identified is the meter movement, but I'll put one together and see what's needed. Cheap movements are all over Ebay in the $5 to $10 range http://www.eserviceinfo.com/download.php?fileid=35055 |
#12
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Speaker line characteristics
On Dec 24, 11:40*pm, "Michael A. Terrell"
wrote: klem kedidelhopper wrote: This question was posed on another group but wasn't really answered. There is a PA installation with several zones . One zone is a bell tower which has a separate speaker in it. The speaker is inaccessible. The DC resistance of that line is 11 ohms. How can an installer determine if this is a 70, or 25 volt speaker and which tap it may be set at? Or perhaps it's just an 8 ohm speaker with 3 ohms of cable resistance added? Is there n easy way to do this without an impedance bridge? Thanks, Lenny * *Here is the schematic for an old TOA analog impedance meter. It should be fairly easy to build one from what's laying around the shop. the only part I haven't identified is the meter movement, but I'll put one together and see what's needed. *Cheap movements are all over Ebay in the $5 to $10 range http://www.eserviceinfo.com/download.php?fileid=35055 Michael, would it be possible to please send me a PDF of that schematic? I can't get that link you posted to work. Thanks, Lenny |
#13
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Speaker line characteristics
On Dec 24, 9:40*pm, "Michael A. Terrell"
wrote: ...snip... * *Here is the schematic for an old TOA analog impedance meter. It should be fairly easy to build one from what's laying around the shop. the only part I haven't identified is the meter movement, but I'll put one together and see what's needed. *Cheap movements are all over Ebay in the $5 to $10 range http://www.eserviceinfo.com/download.php?fileid=35055 I can't get the download to work, either. Any clicking on active areas takes me back to the same screen, but never a download, or potential for download. |
#14
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Speaker line characteristics
Robert Macy forklarede:
On Dec 24, 9:40*pm, "Michael A. Terrell" wrote: ...snip... * *Here is the schematic for an old TOA analog impedance meter. It should be fairly easy to build one from what's laying around the shop. the only part I haven't identified is the meter movement, but I'll put one together and see what's needed. *Cheap movements are all over Ebay in the $5 to $10 range http://www.eserviceinfo.com/download.php?fileid=35055 I can't get the download to work, either. Any clicking on active areas takes me back to the same screen, but never a download, or potential for download. Are you using some paranoid browser settings, like rejecting cookies, hiding referer or disabled javascript? The site seems to have measures to keep leeches away, perhaps you look like that ;-) -- Husk kørelys bagpå, hvis din bilfabrikant har taget den idiotiske beslutning at undlade det. |
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