I know this is off topic of what this website is about, but does anyone know what would be wrong with this? I have a jamo subwoofer 250 and when I plug it in it makes a noise which seems to come from where u plug the cord into the sub and the light does come on, but it does not play music and when I plug my iPad in u can hear a very faint sound of the music which is being played. From the sub, but the music from the speakers where u hook them up has no sound coming from them at all.
Any ideas?
... good question kiteboy dave!
Do we assume you are going from ipad to amp then to sub, the amp is then connected to speakers which play most of the music and the sub doing just the bottom end or low frequencies), if you don't have any music from the amp its probably nothing wrong with sub and its upstream as in the pad, cables or amp that is the problem.
Another question, if you connect to Sub direct to Ipad, what plays the rest of the frequencies, another amp? If you can't hear this music, just check by connecting the ipad direct to this amp. What we want to do is identify where the signal is stopping.
A few things to try:
- check music source (ipad) is outputting music, easily test this by throwing some headphones in, this way you check the volume level is up enough too.
- swap the interconnect cable from ipad to amp, get another one if possible.
- check amp is on and you have the correct source selected.
- check if you have the speakers on as in some amps have speakers A or B, make sure they are selected on.
- if you don't have another cable, try to connect ipad to another device such as a TV, test if the cable is good and you hear stuff normally on the TV.
- make sure the plugs are clean and not corroded ie RCA sockets on Sub are clean ect too.
The noise your getting can be a grounding problem, as in the ground wire or music signal return wire might be broken but since the left and right signals are still there, you get a bit of sound.
If you have been aggressive or plug in and out alot, the sockets in the sub might be crook or a dry solder join internally which requires it to be re-soldered.
Basically check everything else before you blame the sub.
If you have been connecting the ipad directly to sub, you may have overloaded it. If you had headphones in and at normal volume level then connected it directly, this can mean its had high level of signal input which means it may have driven itself into protection mode. Do you connect ipad directly in to SUB?
Check these things and get back to us.
cheers,
Robbie 
Thank you I will try it, hope i can get this to work. Also I dont remember it hasn't been working for a while now.
Newbee are you a stereo newbee? See this freq response? Sub only does sub-bass right, you're never going to 'hear music' through it. Only the very lowest notes eg bass, bass drum, explosions in movies, etc. You need the other speakers for 'music'.
Can't tell if you you understand that or not - give us more info if you want better help!
I'm certain you can connect straight to the sub on a Bose Lifestyle system, but even then that's because that's where the amp is. It's then distributed out to the other speakers.
You wont get "music" out of the speakers Kiteboy has posted above.
Kiteboy Dave
Haha no I am a kitesurfer newbee, wanting to get into the sport, but I am quit familiar with speakers for my dad is a electrion and sells and puts in sterios and surround sound and everything like that. I went to him and asked him about that he said there is something wrong with the transformer
Had the same prblem, it was the receiver, a new denon which is great but if you set the front speakers to large it would put all the base there and almost nothing to the sub, had to set them to small. Read the speaker set up for the receiver carefully.
