Reddit reviews Furman PL-PLUS C 15 Amp Power Conditioner
We found 1 Reddit comments about Furman PL-PLUS C 15 Amp Power Conditioner. Here are the top ones, ranked by their Reddit score.
Furman's exclusive SMP technology provides the highest level of surge & spike protection available.Isolated outlet banks minimize inter-component interference and noise contamination.Segmented LED voltmeter monitors and displays incoming line voltage.Advanced Level Power Conditioning, SMP, EVS, LiFT, 9 Outlets, LED Voltmeter, Pullout LED Lights, Isolated Outlet BanksFrom any outlet to your componentBuilt in surge and spike protectionKeep your equipment in top conditionReduces cross component interference
A TRS (stereo) 3.5mm cable should be shielded enough as far as the cable goes, but you could try something like this- https://www.amazon.co.uk/Ground-Isolator-HAVIT-Speaker-Filter/dp/B01IETQQQK/ref=sr_1_3?ie=UTF8&qid=1485469710&sr=8-3&keywords=Ground+Loop+Noise+Isolator
Another option to try would be cleaning up the source of electricity for the laptop. One way to do this is to use a UPS/battery backup that you can charge with the inverter, and then you plug the laptop into the UPS. This might be your best bet, but it would not clean up the power signal to the stereo.
There are also all sorts of power conditioners out there. For example, this is one that I used with my audio gear to clear up a hum from the old outlets in my apartment. I'm sure there's a UK equivalent- https://www.amazon.com/Furman-PL-PLUS-Amp-Power-Conditioner/dp/B001JJB2GM
EDIT: Didn't realize you also get a noise when a CD is playing. Cleaning up the power to the stereo itself could be complicated, depending on how it's wired in. They do make inline filters like this for these scenarios, but it could be hard to locate a specific source of noise. But definitely try the inline 3.5mm ground loop/noise isolator, it's cheap/easy.
Also, living on a narrowboat sounds awesome.