Y
Yiannis_B
Guest
Απάντηση: Πόσο ρεύμα αντέχουν τα ηχεία μας ?
Και όμως...η αλήθεια είναι κάπου στην μέση.
http://www.avsite.gr/vb/showthread....an-average-of-1-Watt-with-fully-dynamic-music!
Και όμως...η αλήθεια είναι κάπου στην μέση.
http://www.avsite.gr/vb/showthread....an-average-of-1-Watt-with-fully-dynamic-music!
"A 100 Watt amplifier can only be used at an average of 1 Watt with fully dynamic music.
For this reason amplifiers less than 60 Watts should not be considered as audiophile status, but unfortunately many are.
Music is capable of a 60dB (1,000,000:1) dynamic range.
The transients in music are very small in energy but are approx 20dB above the RMS music level.
The average RMS power of fully dynamic music can not go above -20dB of the amplifiers full power capacity without the transients clipping the rail supplies.
20dB is 100:1 so therefore a 100 Watt amplifier should not be driven above 1 Watt of RMS music level (over approx 1 minute of time) to avoid transients being driven into rail clipping.
The modern digital recording trend is to dynamically compress music in an attempt to remove all the dynamic range which includes transients.
Dynamic compression allows music to be played at higher power without transient clipping.
However excessive dynamic compression imposes extreme inter-modulation distortion.
Voices and instruments are squashed and mangled together, rendering articulation of voices and instruments so removed from sounding natural that it is often difficult to recognise.
The largest problem of this irresponsible recording behaviour in pop recordings, TV programs and films is that it makes it difficult to understand the words being sung or dialogue spoken.
The inter-modulation distortion including the removal of articulation caused by dynamically compressing music is so great (approx 30% distortion), that audiophiles and professional sound installers pretending to be concerned about inaudible time alignment differences of speaker driver components on a baffle board is delusion to say the least.
Also dynamic compressed music is already so distorted by the dynamic compression in the recording process that it can be driven into supply rail clipping without being audibly noticed in comparison to the distortion created by dynamic compression.
The maximum level an amplifier can be driven with dynamically compressed music before the added distortion caused by clipping into the rail supplies becomes objectionable, is 1/3 of the equivalent energy of a sine wave at full power.
Worse still, in most live concerts the music is further compressed so the average RMS power can be taken close to 1/2 full power of the amplifiers capacity.
In this condition many professional high power amplifiers will shut down from overheating."
http://www.lenardaudio.com/education/12_amps_5.html
