hitsware,
It seems as long as you have enough power so your amp doesn't clip with dynamic peaks that anything more than that is just a waste, just idling power doing nothing of consequence. Now if the amp is clipping then you need more power but if not it just becomes mine is bigger than yours type of argument.
It seems as long as you have enough power so your amp doesn't clip with dynamic peaks that anything more than that is just a waste, just idling power doing nothing of consequence. Now if the amp is clipping then you need more power but if not it just becomes mine is bigger than yours type of argument.
Things become obvious when you know. There is a thing about 100W amplifiers over smaller ones and people think that is the magic number and below that must sound constrained. But the simple maths suggests otherwise for commercial recordings.
I cannot refute your logic.
BUT
(diving into the dog food)
It's akin to no global feedback
AND
I myself believe that the ears
can perceive way beyond instrumentation.
( from a user of TDA1517 as main system ) .... : )
VU has specified ballistics, I was thinking average rms for an entire piece vs peak start to finish. The fact that sections of a piece drop to near ambient noise is not a fair test. That is turning it up until the quietest passage is at 1W is an unrealistic listening level IMHO.
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Well, you need all that headroom if you're going to be able to play back Tom Danley's recordings of parades, which of course you want to....
see:
Tom Danley's Hi-Di recordings
Haha, I was going to mention those! The train starting one is kinda haunting. Great on headphones.
Depends on what you are listening to. For example if you are trying to keep the softest passages at 30 dB above ambient, and that level is 45 dB then clipping on the loud parts can occur. Now 45 dB is loud but in the range of a window air conditioner.
Used to have neighbors who did play loud enough to reach me above 45 dB. Of course that was not in my current abode.
The big error factor in this discussion is loudspeaker to listener distance. At 3.16M you need 10 dB more power. Then there is frequency weighting. Loudspeaker efficiency may drop at low frequencies but hearing efficiency certainly does.
So when you are listening to an 82 dB/W loudspeaker at 70 dBa the woofer might require more than 10 watts. In that case a 10 dB peak would clip a 100 watt amplifier.
The issue then becomes how the amplifier clips, nasty or nice. The advantage f bi-amplification is that you are most likely to clip the low frequencies and that driver will often provide significant attenuation to the distortion components.
Now for giggles on a large tri-amplified system my low frequency driver may be matched to a 1,000 watt amplifier, the high frequency driver to 750 watts and the midrange never needs more than 50 watts. Unfortunately in pro use racking up kilowatt amplifiers with the babies looks silly to most. So the midrange gets a way oversized amplifier with limiting. A bit interesting is that by the time the amplifier is loaded with all the parts including DSP the cost difference is trivial between tiny and overkill amplifiers. (<$50)
Derfy,
In those ancient days when attending an institution of higher education there were some folks who took lots more than ten years "fulltime" to complete their piled higher degrees. Of course that was done to extend their student deferment to the draft.
So how is your thesis progressing?
Evil Ed 😉
My power amp design efforts would be wasted on you guys. I make nothing below 125W/ch these days.
John,
For many large multi-way speakers your 125 watts seems like a nice power level especially with passive crossovers. I'm not always convinced it is only the power level though as I still think my old H/K with only 90 watts per channel sounded much nicer than the HCA Parasound with 200 watts per channel sounds. I know that isn't a JC marketed Parasound so I can't say anything about the audible differences. If I was going to make a large speaker with multiple drivers and passive networks I would want the extra power especially for the bass section, but with a small two way system that kind of power is just wasted.
For many large multi-way speakers your 125 watts seems like a nice power level especially with passive crossovers. I'm not always convinced it is only the power level though as I still think my old H/K with only 90 watts per channel sounded much nicer than the HCA Parasound with 200 watts per channel sounds. I know that isn't a JC marketed Parasound so I can't say anything about the audible differences. If I was going to make a large speaker with multiple drivers and passive networks I would want the extra power especially for the bass section, but with a small two way system that kind of power is just wasted.
You might be right, K. I use a dual 100W Parasound amp most of the time, and I never noticing ever clipping it, but it is for TV and FM.
Well the first troops hit the beach on the 6th. So things should be softend up a bit on the 7th. Do remember the causality rate for engineers was 41%.
(One of the other time extenders was funding. Work only got completed when the grants were running out.)
(BTY A good tip was to have a professional typist prepare the final manuscript to have a more professional presentation.)
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A professional typist, do those still exist? Just don't use some funky font and make sure you don't make any grammatical errors, which means have someone else edit the paper and you are fine. Lots of well sighted references and done with the proper notation with APA formatting and you are gold. I can't say how many course papers I've had to write and run through those nasty plagiarism checkers and grammar checkers which are the worst. I know a thesis is another animal but they are all the same in the end, a great paper is a great paper. Good luck Daniel, I'm sure you'll do great on the writing.
That's the trend... Huge watts to compensate for something else. Just like huge trucks and expensive cars right?
Depending on the speaker sensitivity the reality is a 15w amp might sound substantially more powerful than 125w, 250w, whatever.
Thanks, Stephen!
I'm 99% confident that Ed is having fun (based on prior emails). My university has more than plenty of rules about style for theses. Fortunately, we have templates.
I am a holy terror as a proofreader, although I get fewer opportunities since leaving UCLA in 1985. Being a member of the nonacademic staff I was friends with both professors and grad students. Sometimes I would get dissertations to read, and it was usually a page or two in when I started spotting things.
But one guy who was remarkably professional in his conduct handed me his. He dared me to find an error of spelling/grammar.
I couldn't. He went on to academic success after being awarded the degree, for a while chairing the Astronomy Dept. at Northwestern.
Oh, mine will be a disaster: I'm gunning for the adage, "1.5 people will read your thesis, including yourself." 🙂
The papers and patents are what really matter, and, yes, those get the fine tooth comb.
Anyhow, don't want to draw too much attention to this.
The papers and patents are what really matter, and, yes, those get the fine tooth comb.
Anyhow, don't want to draw too much attention to this.
Hi Steven,
send the list to england78 at btinternet.com, I will be home Saturday and will also have my PC with me in the hotel for the next few weeks so it will give me something to do on an evening....
Marc
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