KL> You are the second person I've heard with that experience.  A friend of 
min
KL> lost all his Sound Reinforcement system in a similar situation. He was 
he
KL> sound contractor for a county airshow with a stage setup and some 
ational
KL> acts.  An airplane ran over the main distribution cable and provided 240V 
t
KL> ground on the entire electrical system. No audio gear or surge protectors 
s
KL> to be designed to handle this and gear is instantly destroyed.  Since 
heari
KL> of this, I always check any 240V service with a multitester before 
plugging
KL> in. 
KL> 
 
I use surge suppresors on my audio equipment regardless of the long term 
current loss.  My amplifiers shut down in the even of them being plugged into 
a 240 volt receptacle.  My larger amp, a Crest 10004 (2500watts x 4 into 1 
ohm) is pure 120/240 using neutral as effective ground, i never had a moronic 
mistakenly wired receptacle.  Besides, i will be installing auto switching 
relay systems in my audio racks, dual relays and logic controller (2 second 
delay) where it detects a 240 or 120 volt plug and switches respectively to 
those voltages, all it needs is 2 seconds to detect line voltage.  Current 
as
been the only problem in my line of work with over 15,000 watts of sound 
here
it snaps the breaker out of the main distribution box when a nice strong bass 
note hits, so i upped the power supply storage on my troublesome amps (2000 
watts stereo and 4000 watts stereo) which are made by a company here near me 
in toronto called YorkVille Sound, formerly called traynor.  They redesigned 
their line of amps and mixers nicely.  After i upped the storage from a 
easly
54400 æf per channel in these amps to 140,000 EXTRA æf, the amps bass 
esponse
and damping factor and sustainable power increased by 3 fold.  My 4000 watt 
amp supplied 50 amperes per channel (110 amperes bridged), and now the 
measurement is impossible to measure across it because it can melt a 16 guage 
wire in under 5 seconds at half power when the amp is shorted.  Previous 
wattage was 2925 watts RMS coming out of the amp at its specified minimum 
oad
of 4 ohms per channel (it never went beyond that before the upgrade), now i 
measure a easy 500 watts per channel of overhead (about 2500 watts per 
channel) almost stable into 2 ohms (can go for 2 hours at max volume before 
the thermal protection kicks in).  I recommend before anybody performs a 
upgrade on their amps, make sure the MOSFET's (or J-FETS) can take 4 times 
he
rated power of the amp, current wise eg; my 4000 watt amp has 16 transistors 
per channel, each can carry 400 watts easy - total rating 6400 watts per 
channel rated from the transistors.  And make sure the power supply's 
nternal
bridge rectifier diode array is upped to twice the current capacity because 
o
add capacitors to a existing peuny power supply (Eg, CARVER (crap), PEavey 
(crap), and AShly (crap)) the additional capacitors will look like a complete 
SHORT at turn on to the power supply and can blow the current existing small 
power supply.  Need any more details, let me know if you want to increase the 
dynamics and damping factor of your amps.  In case you so called professional 
"dj's" do not know what the damping factor rating of the amplifier is, it is 
simply a matter of measuring a ratio of how much control the amp has over the 
speaker cone, expecially at HIGH volumes.  Most amps with a low damping 
actor
will lose control of the speaker cone at high volumes causing the speakers to 
heat up from electrical friction and makes the music illegible (voices, 
cymbals, bass sound farty etc.).
--- GEcho 1.00
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