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Old 3rd March 2004, 05:31 AM   #21
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The heavier thing is usually a reference to the power transformer. The good high powered ones tend to be heavy. At the same time, I've also wondered why manufacturers don't put massively heavy heatsinks in their amps (unless they have to) just to make them seem more impressive to the consumer
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Old 3rd March 2004, 05:58 AM   #22
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Most sorround sound recievers now of days do have jiant heat sinks. I look at their small power transformers and wonder were the 500 watts comes from. I guess they are rated 500 watts but can only push about 150 all at once. Junk junk junk.

I'd say if I have my amp cranked to the point of audible distortion, 75 watt peeks, I'm only using about 5 some watts average. Hooked up to two sets of 20+ year old speakers (epi&h.h. gregg) = LOUD!
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Old 3rd March 2004, 06:03 AM   #23
navin is offline navin  India
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while we are on this topic i would like to know ho to convert good old fashioned RMS watts to something called "PMPO". do I multiply by 10, 20, 100? There seems to a plethora of 7000W PMPO systems in India.

funny but my 200W system seems a lot louder and I cant even get past 9 o clock position on a quiet day. By the time the volume knob is at 12 o clock it is disturbing neighbours 3 doors down.

Best way i have found so far is to invite people over with their 7000W systems (at 200kgs i am not carrying mine anywhere). Then I play a Cd on their system and ask them to shout over the music. reapet the same with my system.

what i find is that these 7000W systems sound loud because they put ot a lot of distortion. But if you shout you can hear your self. because your voice does not distort. With a good clean system that has distortion under control you dont know it is loud till you cant hear your self shout.

Also I would like to know if my system is to be rated at 200W or 400W if it is biamped and each amp is 200W rms. I claim it is 200W because the sub amp operates over only 1 octave so one can ignore its watts.
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Old 3rd March 2004, 06:11 AM   #24
elizard is offline elizard  Canada
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Quote:
Originally posted by ooheadsoo
The heavier thing is usually a reference to the power transformer. The good high powered ones tend to be heavy. At the same time, I've also wondered why manufacturers don't put massively heavy heatsinks in their amps (unless they have to) just to make them seem more impressive to the consumer

I know that heavier usually means a beefier power supply/bigger heatsinks. Unfortunately, using "heavy" in terms of quality is a very poor measure i'd say (up there with saying 5x100watts, or 5x150w, etc, or the THD figures ..)
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Old 3rd March 2004, 06:35 AM   #25
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Heck yeah, it's horrible! Hah, at least if he had tried to explain about the power transformer, it might have seemed plausible, but without explanation, he just sounds crazy - and he thinks you're a sucker too!
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Old 3rd March 2004, 06:41 AM   #26
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Quote:
Originally posted by navin
while we are on this topic i would like to know ho to convert good old fashioned RMS watts to something called "PMPO". do I multiply by 10, 20, 100? There seems to a plethora of 7000W PMPO systems in India.

funny but my 200W system seems a lot louder and I cant even get past 9 o clock position on a quiet day. By the time the volume knob is at 12 o clock it is disturbing neighbours 3 doors down.

Best way i have found so far is to invite people over with their 7000W systems (at 200kgs i am not carrying mine anywhere). Then I play a Cd on their system and ask them to shout over the music. reapet the same with my system.

what i find is that these 7000W systems sound loud because they put ot a lot of distortion. But if you shout you can hear your self. because your voice does not distort. With a good clean system that has distortion under control you dont know it is loud till you cant hear your self shout.

Also I would like to know if my system is to be rated at 200W or 400W if it is biamped and each amp is 200W rms. I claim it is 200W because the sub amp operates over only 1 octave so one can ignore its watts.
that is Peak Music Power Output i would guess. It is a number invented by marketing department. for instance see logitech computer speakers that say they are 470 watts and have a tiny little heatsink maybe big enough to cool 1 channel of a gainclone if you are lucky.
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Old 3rd March 2004, 08:18 AM   #27
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I always pay the extra $0.39 to upgrade to the Biggiewatt size. Sure I don't need it, but the excess makes me sleep better at night.

Like I always say if your gonna waste 5 gallons of water you may as well flush the biggest turd


Even with Saving Private Ryan very loud, I've never clipped my Monarchy Audio 35 watter on Magnepans.
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Old 3rd March 2004, 08:23 AM   #28
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Peak Music Power Output? No way!

PMPO = (and) Pigs Might Pulverise Octopi

You see, we have have that acronym here in New Zealand too. I'm waiting until those crappy little computer speakers for sale break the One Million Watts PMPO mark. At some point I had the impression that perhaps for a fraction of a millisecond or so, many speakers could withstand something like 1000W. It wouldn't burn up the voice coil, and mechanically it might be durable enough to withstand it, but then I noticed that they sold "amplified" speakers with similar ratings, it's such BS that I just can't be bothered.

What's even dumber is the car audio faction here in NZ. They buy 10" subwoofers rated at 150W RMS, are somehow led to believe that they're actually 1000W, so they buy enormous 1000W RMS D-class blocks of metal and blow the speakers up. Some of them have these technical explanations of how inadequate grounding of the amplifier causes clipping distortion which is actually DC current which therefore cooks the VCs , and yet the filtering action of 3.5mH means nothing to them. What fuels this belief is that even the RMS power ratings are often way too liberal and just about any old power amp could wreck some of the crap for sale here.

CM
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Old 3rd March 2004, 08:50 AM   #29
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Tiggerfip
.
I was under the impression that when the volume read zero then the amp was using one watt of power. Is this correct or has nothing to do with power and is an abitrary system?
It is very unlikely to be correct,
unless the input level is unusually low.

If zero is at full rotation the numbers refer to ~ how much
you are reducing the maximum voltage sensitivity of the
amplifier, i.e. Watts/Volt input.

To cope with low output devices typically an average amplifier
with an average input will be at full power on peaks between
around 12 and 2 oclock.

sreten.
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Old 3rd March 2004, 09:25 AM   #30
navin is offline navin  India
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Quote:
Originally posted by neutron7
that is Peak Music Power Output i would guess. It is a number invented by marketing department. ...
how do they arrive at this. there must be a formula or some assumptions.
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