[Jukebox-list] Speaker Isolation ?

[James Alexander]

Gentlemen: 
With the 40's era Wurlitzer jukes, the single 15" speaker was mounted to a small baffleboard that was rubber-shock mounted to the jukebox cabinet.  The prime reasoin for doing this was to reduce the possibility of acoustic feedback  (howling sound, normally associated with microphone use) at high volume settings.   
By today's standards the bass response in these machines is boomy-sounding and not accurate.  Also, filter and tone control circuits used in later 50's amplifiers were able to be built with steeper filter slopes.
Speakers in 50's -up jukes need to be properly mounted to the baffleboards--otherwise low end response will suffer.   If there is a problem with other hardware in the cabinet rattling with bass frequencies, the rattle should be located and stopped at the source.    Dried out rubber insulation around dome glasses are a frequent contributor.    The fit between the dome door and the cabinet, if loose, can cause rattles.    Going to a home improvement store (Home Depot, Lowes, etc) and picking up some adhesive backed foam insulation will work wonders for problems like this.     
Using a sine wave sweep-tone audio generator into the sound system helps find offending rattles, vibrations more easily.
Jim Alexander
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