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Δικάναλος Ήχος
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Audiolab 8000 Πόλωση και Προβλήματα
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<blockquote data-quote="sokmav" data-source="post: 1056794464" data-attributes="member: 36674"><p><strong>Απάντηση: Re: Audiolab 8000 Πόλωση και Προβλήματα</strong></p><p></p><p></p><p></p><p><a href="http://sound.westhost.com/bi-amp.htm" target="_blank">Εδώ</a>,λέει άλλα.</p><p>Πιο συγκεκριμένα:</p><p>If we assume that our 100 Watt amplifiers will be handling exactly the same peak amplitudes with typical program input, then we have a total of 200 Watts for the combined program material. So, where does the magic come into this? This amp combination will sound (and measure) as if it were 400 Watts - twice as much "effective" power as there is real power. For this to make sense, we need to back track a little.</p><p></p><p>Imagine a sine wave signal of 100Hz at an amplitude of 28V RMS. For an 8 ohm load, this equates to about 100W (98 actually). The same amplitude at 1000Hz will be exactly the same power. Now add the two signals together, in the same way that signals add together in music. We are interested only in the peak amplitude, the RMS value indicates that the power is only 3dB higher, but it is only when an oscilloscope is used that the true picture emerges.</p><p></p><p>We will now see a low-frequency waveform, with a higher frequency waveform superimposed - the high frequency signal will be riding up and down the path of the low frequency signal. If we were to perform a calculation (or simply measure the combined signal with an oscilloscope), we will see that the peak amplitude has doubled. The effective RMS value (most multimeters will get this wrong unless they are true RMS types) is 40 Volts, and this would imply 200W. Although this is the real RMS voltage, it totally underestimates the amplifier power needed to reproduce it cleanly. An oscilloscope shows 80V peak for the same waveform, so the amplifier must be capable of passing an 80V peak signal - a 400W amplifier.</p><p></p><p>Κι επειδή έχω μάθει να εκτιμώ πιο πολύ την γνώμη τεχνιτών,και δη καλών τεχνιτών όπως εσείς που έχετε και την γνώση και τα τεχνικά μέσα,θα ήθελα αν γινόταν να μας το αποσαφηνίσετε για να μην ακούμε και διαβάζουμε το οτιδήποτε...</p></blockquote><p></p>
[QUOTE="sokmav, post: 1056794464, member: 36674"] [b]Απάντηση: Re: Audiolab 8000 Πόλωση και Προβλήματα[/b] [URL="http://sound.westhost.com/bi-amp.htm"]Εδώ[/URL],λέει άλλα. Πιο συγκεκριμένα: If we assume that our 100 Watt amplifiers will be handling exactly the same peak amplitudes with typical program input, then we have a total of 200 Watts for the combined program material. So, where does the magic come into this? This amp combination will sound (and measure) as if it were 400 Watts - twice as much "effective" power as there is real power. For this to make sense, we need to back track a little. Imagine a sine wave signal of 100Hz at an amplitude of 28V RMS. For an 8 ohm load, this equates to about 100W (98 actually). The same amplitude at 1000Hz will be exactly the same power. Now add the two signals together, in the same way that signals add together in music. We are interested only in the peak amplitude, the RMS value indicates that the power is only 3dB higher, but it is only when an oscilloscope is used that the true picture emerges. We will now see a low-frequency waveform, with a higher frequency waveform superimposed - the high frequency signal will be riding up and down the path of the low frequency signal. If we were to perform a calculation (or simply measure the combined signal with an oscilloscope), we will see that the peak amplitude has doubled. The effective RMS value (most multimeters will get this wrong unless they are true RMS types) is 40 Volts, and this would imply 200W. Although this is the real RMS voltage, it totally underestimates the amplifier power needed to reproduce it cleanly. An oscilloscope shows 80V peak for the same waveform, so the amplifier must be capable of passing an 80V peak signal - a 400W amplifier. Κι επειδή έχω μάθει να εκτιμώ πιο πολύ την γνώμη τεχνιτών,και δη καλών τεχνιτών όπως εσείς που έχετε και την γνώση και τα τεχνικά μέσα,θα ήθελα αν γινόταν να μας το αποσαφηνίσετε για να μην ακούμε και διαβάζουμε το οτιδήποτε... [/QUOTE]
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Audiolab 8000 Πόλωση και Προβλήματα
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