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

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?

"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

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.

"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

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.

"Michael A. Terrell Autistic Retard "

( snip pile of utter ****)


** **** off to hell - you rabid, lunatic, ****wit TROLL

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.

"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.

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.

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

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

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.

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 ;-)

--
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