[Jukebox-list] Using multiple speakers on a Seeburg M100B

[Jay Hennigan]

Aaron Heverin wrote:
> While the subject of adding speakers to a M100B is out there...and I'm hopelessly bored at work... I was wondering what exactly is going on with the audio that goes out from the speaker terminals on the amp for a B or a C. I have a C in my basement with a 4 ohm Alpine coax speaker mounted in an enclosure in my upstairs living room. In my older Buick, the pair of those speakers rocked! Everything is hooked up correctly at the jukebox and I get almost deafening audio coming from the thing...but the quality of the sound is annoying at best. It's just "there." There almost no bass and the high end is distracting. While the amp itself is filtering out most of the record noise down at the jukebox, you can hear every scratch, hiss, and pop coming from the records out the external speaker. Way too much high end. Was this always the case with adding additional speakers to these amps? Were they just meant to fill a dead space in a room ONLY, or are you able to get good quality sound 
from externals? If so, how? I thought of putting a car stereo EQ in line with the output of the amp's speaker terminals, but then you have to get the whole matching transformer deal and 12 volt power going and it seemed more trouble then it's worth.

In what kind of enclosure is the 6 x 9 coaxial speaker mounted?  In your 
Buick, the speaker was typically on the back deck with the back facing 
the trunk.

Just the speaker by itself without an appropriate enclosure will sound 
pretty bad as the air from the back of the cone has a short path to the 
front of the cone, pretty much canceling out the bass.

There can be quite a bit of math involved in tuning a speaker enclosure 
to the particular drivers used, but any kind of a box or even a large 
board (called a "baffle") will greatly improve the sound over a raw driver.

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Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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