Bridge mode and damping factor |
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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Not wishing to contradict myself (again!) but something else came to mind regarding back EMF and amplifier DF figure.
Certain well known Class D manufacturers claim that their amplifiers can recycle the back EMF from drivers, into the amplifier's PSU, recharging the caps. If, as some would suggest, the back EMF from drivers is most all dissipated by the VC as heat, such recycling claims by amplifier manufacturers would seem to be pure marketing horsesh1t. Which is of course possible. However, there is still this issue, around cabinet/driver resonance, and effect on impedance curve.
So perhaps, there is something in it. The maximum back EMF, seen by the amplifier, occurs at exactly the point(s) where the driver/cabinet impedance curve drops to a minimum. The exact same point(s) that an amplifier headroom boost, from recycled back EMF, will be most useful, in preventing clipping (due to lower impedance/increased output). In which case, these class D manufacturers may be on to something quite ingenious. That would also mean, that perhaps relatively higher amplifier DF figure can be quite important, but only if the amplifier has plenty spare current available too e.g. class A/B or G/H amplifier in bridge mode, loaded and leveled to provide 1.5x - 2x headroom. Of course the class D still does it more efficiently, but the result is the same. I'll get my coat Edited by Sonic the hedge - 22 May 2020 at 10:42am |
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singingfish
Registered User Joined: 25 October 2009 Status: Offline Points: 52 |
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I may be wrong..
but here goes. Is it correct that two or four matched drivers in an enclosure actually damp 'each other' electrically and by air pressure damping? If true, his would mean that ganging up drivers would present an easier load for the amp to drive/control, wouldn't it That was always my assumption anyway. very interesting thread. |
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Sonic the hedge
Registered User Joined: 12 May 2020 Status: Offline Points: 161 |
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Discovered this on my travels, which is what I was referring to Lower bass frequencies trigger a contraction effect in the ear, which protects it from damage at high levels. High frequencies are too fast to trigger the reaction, but the reaction produced by lower frequencies reduces the pressure across the spectrum. Essentially it's like having a compressor in the ear, that is sidechained only to the lower frequencies. This is consistent with my experience that mid/top heavy systems causes most ear ringing afterwords, whereas very bottom heavy systems can produce no ringing at all, even when very loud. I guess this has evolved in humans because the very loudest sounds that occur naturally (thunder, earthquakes etc) tend to have low frequencies.
Edited by Sonic the hedge - 01 August 2020 at 3:56pm |
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