File:Amberley loudspeaker.jpg
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Summary
DescriptionAmberley loudspeaker.jpg |
Español: Altavoces antiguos.
English: A radio shop in Amberley Working Museum, stocked with old radios and loudspeakers. The 6 speakers on the lower shelf are all horn loudspeakers from the 1920s. They consist of a small compression driver unit containing a small metal diaphragm vibrated by an electromagnet, creating sound waves. The sound is conducted to the open air through the flaring horn. The horn serves to improve the efficiency of the coupling between the diaphragm and the air, so they produce more sound power and are louder than cone speakers when driven by a given signal. The weak vacuum tube amplifiers in early radios couldn't produce much output power, and virtually all loudspeakers from the period used horns to achieve adequate volume. A disadvantage of horn speakers was that the frequency response dropped off below a certain cutoff frequency. Therefore they couldn't reproduce bass frequencies below the cutoff, causing them to sound "tinny". Permanent magnets of the time weren't very strong, so many speakers, such as the Magnavox (right), used electromagnets for the field magnets, usually powered by a 6V lead-acid storage battery. Speakers loud and otherwise. |
Date | |
Source | Flickr |
Author | Les Chatfield from Brighton, England |
Reviewer InfoField | Jeekc |
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by Elsie esq. at https://www.flickr.com/photos/elsie/8231194/. It was reviewed on 18 February 2007 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
18 February 2007
Items portrayed in this file
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 13:08, 8 April 2006 | 1,024 × 768 (669 KB) | FlickrLickr | {{flickr| |title=Speakers loud and otherwise. |description=A radio shop in Amberley Working Museum, stocked with old radios and loudspeakers. |photographer=Les Chatfield |photographer_location=Brighton, England |photographer_ |
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Metadata
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Camera manufacturer | FUJIFILM |
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Camera model | FinePix S5000 |
Exposure time | 1/60 sec (0.016666666666667) |
F Number | f/2.8 |
ISO speed rating | 400 |
Date and time of data generation | 01:43, 2 April 2005 |
Lens focal length | 8.4 mm |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Digital Camera FinePix S5000 Ver3.00 |
File change date and time | 01:43, 2 April 2005 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 01:43, 2 April 2005 |
Image compression mode | 2.6 |
APEX shutter speed | 0.880078125 |
APEX aperture | 3 |
APEX brightness | 0.48999999940395 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, auto mode |
Color space | sRGB |
Focal plane X resolution | 3,007 |
Focal plane Y resolution | 3,007 |
Focal plane resolution unit | 3 |
Sensing method | One-chip color area sensor |
Custom image processing | Custom process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Sharpness | 3 |
Subject distance range | Unknown |
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