Loudspeaker heads with flat diaphragms. Reference data

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Flat diaphragm loudspeaker heads (LF, MF, HF and SHP). Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Names., GOST9010- 6773.78	Names., OST4.383 . 001-85	Rnom, Om	Fres, Hz	Range frequencies, kHz	Sensitive, db	Pnom., W	Pnormal Harm., W	Pmax, noise., Tues	Pmax, duty., Tues	Pmax, short, Tues	Sound pressure at P=Psh, dB
4A-32-6	-	16	42	40-14,0	95	12	-	50	-	-	111,9
-	300GDN-1	4/8	18	20-3,15	90	-	-	200	300	-	113,0
-	200GDN	8	25	31,5-4,0	88

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Acoustics of Stonehenge 13.11.2010

A group of archaeologists from the University of Salford (England) is studying the famous Bronze Age megalithic monument Stonehenge from the point of view of acoustics.

Computer simulations have shown that sound reflections from standing stones should produce interesting acoustic effects. Experiments and measurements carried out on Stonehenge itself and its concrete reconstruction, built in the USA (the monument itself was partially destroyed many centuries ago), confirmed this conclusion. The echo from sharp clicks made in the center of the stone ring lasts 1,2 seconds.

Although the structure does not have a ceiling, its acoustics are comparable to a good auditorium or concert hall. The words of the person standing in the center of the ring of stones are clearly audible to all gathered around. Apparently, the builders specially created such an effect for holding religious ceremonies here.

It is not for nothing that the outer sides of the stones that make up the monument are only roughly hewn, while the inner side is made even, well reflecting sound. And they say that the wind of certain directions makes the whole Stonehenge hum melodiously.

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