View Single Post
Old 23rd Mar 2020, 6:13 pm   #4
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,526
Default Re: Wireless Relay 1930

Quote:
Originally Posted by Hartley118 View Post
I find it impressive how the commercial incentive of 'talkie' films in the 1920s led to such rapid developments in speakers, largely in Bell Labs (Westrex). By 1930 we had speakers that would bear comparison with today's developments, perhaps give or take an octave or so at the top end. But I don't think their electro-acoustic efficiency has ever been bettered.

Martin

Quite. 5 - 10W into a decent horn loaded speaker would beat 100W or more into a typical modern PA speaker for acoustic power out.


Of course nowadays high power audio amplifiers with modern speakers are cheaper and less unwieldy than the low power amplifier and efficient horn speaker combo.


High power audio + horn loading, now....
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is online now