Phil Allison wrote:
Hi to all,

initially inspired by our resident ubergeek " Klem ", about a month ago, I
persuaded my friend Rod Elliot of ESP to put together and publish a
comprehensive discussion of the many complex issues with transformer coupled
speaker loads as used in typical voice paging systems. Aka " Line Voltage
PA " .

The result of our combined efforts may well be THE definitive article
available on the net or elsewhere on the methods, design goals and many
unseen hazards inherent in such systems.

The detailed discussion of the audio transformer saturation hazard ( and how
to defeat it in practice) it is not something either Rod or myself have
ever seen published elsewhere.

http://sound.westhost.com/articles/line-amps.html

Lotta words, read them all carefully.....


..... Phil


The article was well written and answered a few questions I had about
installing 70V (70.7V was referenced in the article early on) speaker
systems.

I've only done a few of these over the years and have been lucky to have
reasonable sound coming out at the end of the job.

Nice to know how to do it correctly, or at least good theory that can be
argued with instead of opinions.

Lets reduce the flames here, and consider the desired result (an
increase in knowledge) and go from there, otherwise this group often
sounds like a elementary school yard and, as I'm not 8 years old any
more, I for one am not going to play along...

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."