My Fishman Loudbox 100 bass speaker buzzes- what could it be? Someone suggests it could be a poor ground, and to replace the input wire, etc. Does he mean the guitar input cable? The speaker does not sound like it is damaged, but does it need to be fixed?

Question edited for clarity and Capitalization.

Contact them direct and ask where their closest service centre is. Rechargeable items only last so many charge cycles.

Loudbox Mini Charge - Fishman

https://www.fishman.com > portfolio > loudbox-mini-c...
Rechargeable Battery Power (up to 18 hours); 60 Watts; 2 channels: Instrument & Microphone; Digital Reverb & Chorus; Bluetooth® 4.0 Connectivity.

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Either the speakers have loosened from the faceplate, or one or more have blown. Open the amp and tighten them down. If that doesn't fix it, remove them a take them to the nearest speaker repair shop for a checkup. If blown either have them re-coned or replace them.

http://www.fishman.com/product/loudbox-mini

Fishman iis you best bet http://www.fishman.com

You can download the user manuals, they do have a block diagram, but the scan is pretty bad.

It may end up the person looking at it is going to need to rely upon their general knowledge.

My own suggestion is to pull the chassis out so you can work on it while powering it. And then work your way through the amp with either a signal source plugged in at the input, and with high impedance headphones with test lead ends, go through each audio stage carefully. until the fault is isolated. If it is not caps or the rectifiers in the power supply, faulty ground connections to chassis or faceplate, a faulty 4558 is most probable. The headphone approach is the fastest way to address this last one. If a different series of preamp chip is used, a good source for the IC datasheets in general is Digikey http://www.digikey.com and parts too.

I have seen defective XLR cables so check it with an ohmmeter. It is possible the mic input preamp has been damaged. If that is the case, the unit will have to be repaired.

I don't understand your question. The "Aux in" is just that an input that goes to the power amp. Please note that the Fishman Loudbox does NOT have a headphone jack so don't be disappointed as there plain isn't a headphone jack on this unit. I would recommend that you get a small headphone amplifier for the purpose... or even go to a thrift store and get an old stereo system that has a headphone jack and use that.

http://www.fishman.com/files/loudbox_100_user_guide.pdf

 

Hope this helps!

If the adapter does NOT show it handles your voltage and frequency of your mains then you need to get an adapter designed for for the Loudbox and the mains you have.

DO NOT try to use a "convertor" driving the adapter you have.

If you have a pedal input, you may be getting FALSE trips of this.

You may have a pedal jack with switch that is marginal.

TRY putting a pedal into the effect pedal input IF your unit has that and SEE if it acts stable.

These jack and jack switch problems are a pain on all these amps... any brand.

That is happening because your grounds went bad. Without grounds, then the amp will produce a buzzing sound. I would replace the input wire, that is probably the problem