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   alt.collecting.juke-boxes      Jukebox collecting      1,635 messages   

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   Message 714 of 1,635   
   lino200rk@yahoo.com to All   
   Re: amplifier   
   14 May 14 01:58:20   
   
   I'm not entirely sure of what you are attempting to do here but, jukebox   
   cabinets and speakers are typically matched in the bass section to produce a   
   certain frequency response.    
      
   From the spec's of the woofers you chose it seems they would be OK.   
      
   The bigger problem here is that juke amps typically have a lot of tone shaping   
   to boost bass response in certain frequencies and roll-off others.    
      
   The deepest bass <40Hz are usually attenuated to save amp power and reduce   
   stress on the woofers, and the bulk of the bass boost occurs in the 60-90Hz   
   region.  This is typically on the order of 10-14 db and often tied to the   
   position of the volume    
   control. The greatest boost occurring in the lower levels settings.   On amps   
   where there is actual audio in the volume control itself most of the boost   
   occurs via taps on the control itself.   On newer designs where the volume   
   control is actually all    
   electronic it is done within the circuitry.     
      
   Jukeboxes also have an AGC or automatic volume control that makes reasonably   
   sure that all tracks come out at the same level. This also helps with the tone   
   shaping in that the actual position of the volume control can stay at a   
   certain point and not have    
   to be adjusted for each track.   
      
   The little amp you bought is simply a power amp w/no tone shaping -that must   
   be added before it.   
      
   If you are just going to play tracks from a computer you can have the player   
   normalize the levels of all tracks. Or use an external program such as MP3Gain   
   Most players also have an "EQ" function with both graphic and preset EQ   
   settings.    
      
   Be sure that both woofers are in-phase with the same wire from each terminal   
   on a speaker going to the same terminal on the amp. Out of phase speakers with   
   kill the bass.   
      
   Rob/NYC   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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