AMI jukebox channel outputs

[rj9]

Hi,
I just joined to ask a question.
I'm just a guy that goes to a joint with an AMI jukebox.
It seems like some songs are not played fully -- such as a guitar is missing.
I told the owner but not likely that it will be looked at.
I took this pic from the back of the unit.
Wiring connected to channel 1 for E1 and E5 with no connections to channel 2.
No speakers for channel 2 output?
Is that why we're not hearing all of the song?

Thanks very much for any comments.
Please pardon me for any protocol breach.

[jdemarti]

You are correct. Your jukebox is set in Stereo mode, but you have both speakers connected to one channel (left or right). Most of the time when I see this type of connection is when the unused channel on the amp has gone bad. 

You can test it by moving one of the wire sets to the other channel.  If the channel works your problem should be  fixed.  If the channel is bad the recommend solution is to have the channel fixed so sound will come out in stereo.

The other option is to switch the amp to mono mode so you get equal sound out of both speakers. However, that should only be a temporary solution until you can get the other channel fixed.

Good Luck

[rj9]

Great!  Thanks very much for the reply, jd.  I appreciate it.
I hope I can persuade the owner to try to get it sounding right.  If not, I might take a screwdriver in there myself sometime and move ch1 E5 to ch2 E5 and see what that sounds like. It's a big room with a lot of speakers (20?) and who knows which ones are E1 and E5.
It's a little annoying to not hear the songs the way they were meant to be heard.
Thanks for the help.

[jdemarti]

Sure thing.

20 speakers?  Are you using the 70V distribution or the E taps to power all those speakers?  I'm not an amp or speaker expert, but I do know that serious problems can arise if 20 speakers are connected to the E taps in the jukebox, especially if they are wired in Parallel. In Parallel, the impedance would be so low that the amp will probably blow.  If in series, the impedance would be so high the speakers would sound really bad.

[ami-man]

It sounds as if one side of the amplifier is not working  hence the reason of just connecting to one side.

If you are using that many speakers then they need to be connected in the correct configruation so that the overall impeadence is above 4 ohms per channel. So correct series /parallel connection need to be configured.

To achieve this you may need to select 4, 8 or 16 ohm speakers. The alternative is using the 70 volt line connections and line transformers on the speakers.

Regards
Alan

Alan Hood
ami-man
UK