On Wednesday, December 31, 2014 10:00:06 AM UTC-5, Pico Rico wrote:
Not sure what's going on by you. I just copied and pasted the link from
internet explorer to google groups and it worked.
Anyway, it does address what the poster was asking about.
On Wed, 31 Dec 2014 06:09:07 -0600, firstname.lastname@example.org wrote:
Only if you tried to push too much power through too many speakers.
Yes, they still use 70 volt "distribution" outputs on many PA systems.
The output transistors are made to handle the high voltages directly.
Lots of Bogen systems out there with direct outputs to 70 volt line.
If you read the fine print it is "1000 watts peak music power" aka
"Peak Power Output" and in even finer print it will say something like
"20 watts RMS per channel".
There is no established standard for measuring "peak music power" or
Peak Power Output"
As for getting into legal trouble, The Federal Trade Commission is
putting an end to this with Federal Trade Commission (FTC) Rule 46 CFR
432 (1974), affecting Power Output Claims for Amplifiers Utilized in
Home Entertainment Products.
On Wed, 31 Dec 2014 16:18:19 -0500, email@example.com wrote:
Bogen seems to have been the leader in P.A. systems for many years.
Since I have not worked with this sort of stuff in years, I didn't even
know the company was still around. But this comes as no surprise, since
they always made quality equipment.
Somewhere in my garage, there is still a Bogen amp from maybe the 1950s.
It's a tube amp. It did work, but has not been plugged in for at least
25 years. I'd hesitate to plug it in, before replacing the power supply
capacitors. It was no big power, probably about 50W. I got it from a
building that was being demolished. That building was used for
livestock auctions. I suppose it was the PA for those auctions.
Back in the 60s and 70s, Peak Power was generally about DOUBLE the RMS
power. That made sense and was probably fairly accurate. I had a power
amp back then, rated at 100W RMS, and it said 200W Peak. I used it to
do sound for some Rock bands from that time period, along with a mixer
About time!!! I'd be surprised if that boombox output is more than 10W
per channel RMS. That would mean 20W peak per channel, or 40W total
Peak. That 1000W rating is pure bullshit. There is no 5" speaker that
could handle that power, and no D-cell batteries that could power it.
(or a 2" Wall transformer power supply).
I still remember back in the 70s, when I did sound and lighting for rock
bands, far too many times the bars and small clubs that hosted the bands
did not have enough breakers to power the sound system and other
equipment. Granted, our stage lighting sucked most of the power, but
the amplifiers still needed a good 15A (preferably 20A) dedicated
We finally got a breaker box, mounted it on a board, and added a bunch
of outlets. Then there were 3 heavy cables with well insulated large
alligator clips, which we'd tap right off the MAINS. But there was an
extra charge to the club for doing that, so some of the clubs did update
their wiring after awhile.
Today's sound systems for bands need even more power than back then, but
most modern stage lighting is now LED, so that offsets the power
demands. And most places that host live music these days seem to have a
whole bank of outlets at the stage. I guess they finally wised up!
After getting the correct URL I downloaded this and it's a very good and
interesting article. I'm glad it went back to the history involved,
because the earlier systems were the ones that I was familiar with, and
I did have to work on a few of these systems in large buildings, where a
speaker would stop working or sound bad. Most of the time it was a
faulty speaker, but I did change a few transformers. Thanks for the
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