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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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