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Fishman Loudbox LBX-001 Bad Capacitor

I have a Fishman Loudbox Pro (LBX-001) Fishman tech tells me the distortion (at all volumes) that I am hearing is likely due to a bad capacitor. I would like to fix it. Any insight into this particular product or schematics that I can glean?

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Posted on Jan 02, 2017

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SOURCE: My Fishman Loudbox 100 bass speaker buzzes- what

It is a poor ground but it is not necessarily in your amp.
If it is only buzzing when you have a guitar or other piece of equipment connected try a new lead cable.
If it buzzes all of the time......remove the cover at the rear of the amp and remove control panel.
Inspect the feed line to the input. If it is loose or or take to have repaired.

Posted on Oct 12, 2009

  • 5603 Answers

SOURCE: The reverb (or any effect) on my Fishman Loudbox

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.

Posted on Feb 01, 2010

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SOURCE: I have a Kurzweil Mark-Pro

I don't know what you "tested" the power supply board with, but I would use an oscilloscope to look at the outputs to see if any of the regulators are drooping. Clicking is a broad term... if it is a relay, it PROBABLY is for speaker protection and senses balance of the power amps.
With a two minute delay, this is PROBABLY a thermal issue... Use freeze mist/circuit cooler to find suspicious parts.

Posted on Jan 02, 2011

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SOURCE: Mixer does not sound "clean"; almost distorted

If more than one input is bad, then problem has NOTHING to do with the preamps. Check list:
1. Make sure you are using BALANCED lines everywhere... either XLR or TRS cables.

2. Make sure ALL interconnected equipment, mixers, amps, powered speakers, CD players, etc. are ALL powered from the SAME receptacle or power distribution unit.

3. Do proper setup. Select each channel PFL and set the trims so the indicator never goes into clipping, but is in the 70% range during max volume input to mics, etc..

4. During operation the sliders should be at least 50% up on used channels and the mains. Setting of levels throughout the system is important for noise free operation. Using EXCESS gain at some point results in distortion and noise. Using sliders near the bottom position results in poor signal to noise ratio.

Now re-read #2 above... and believe it. I have seen a lot of equipment blown due to ground bounce of building power. That is why the pro's run power back to their mixer from the area where the amps are powered.

Posted on Apr 30, 2011

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SOURCE: I have a new fishman

Does it make the noises at higher gains with nothing plugged in? If not, check your guitar cables and connectors.

Posted on Jul 11, 2011

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

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The reverb (or any effect) on my Fishman Loudbox 100 has become unreliable. It goes in and out randomly.

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.

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