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? Thanks, Lenny

 

[Phil Allison]

"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]

"Michael A. Terrell"

Sigh.

** ROTFL !!

The Terrell fuckwit 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]

"Michael A. Terrell Autistic Retard "

( snip pile of utter SHIT)


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

 

[Phil Allison]

"Michael A. Terrell Autistic Retard "

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


I keep telling you, I'm not into guys.

** Only quadrupeds - with big ears.

 

[klem kedidelhopper]

   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

 

[Leif Neland]

klem kedidelhopper kom med følgende:

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

Did you try the
Download >> To download the file, please, click here ! << Download
link?

Worked fine for me.

Leif

 

[Robert Macy]

...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.

 

[Børge Jensen III]

Robert Macy forklarede:

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 ;-)

 

[Robert Macy]

   Did you click where it says: "To download the file, please, click
here !" between the two that say "Download"?  It is in the center of the
sixth line from the bottom of the white box.

   This is what the line looks like:

Download >> To download the file, please, click here ! << Download
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

the web page
<http://www.eserviceinfo.com/download.php?fileid=35055>
shows your quoted line in my browser, but when I hold the cursor over
the "To download ..." section this shows:
<http://www.eserviceinfo.com/download.php?fileid=35055>
which looked the same so I assumed something was wrong ....without
trying. I've had these 'circular' links in several commercial webpages
which were a complete waste of time, so again I didn't even try.

but will now:
and YES it comes up with the 'save' window ?!

Guess the lesson is to try, NEVER assume.

Thanks.