Oh dear I did start something, but for very good reasons. The Uk public will blame anybody but themselves. If its cheap or expensive there is no difference - its always the last bloke who touched it. I would NEVER modify anybodies else's equipement, its a formulae for eternal damnation.
My wife goes line dancing, the hall is quite big, when I collected her at the end of the session some years ago, the organiser said the audio was to low level from her "expensive" Ghetto blaster. If it had cost Â£20 it would have been a robbing case. She argued that at home the device was LOUD but in the hall it was useless. I gave the simple answer which you all can concure with; its Cr*p you are using, too small an output, the room here is bigger etc etc. "No" was the answer "its the electricity at the hall - they are on a cheap tariff, its is not strong enough!" Same thing over somebody who asked me about a surround sound unit - what a heap; Speakers like bean tin lids, about 250mW / Channel. When I gave similar opinion, the wife went into orbit - "I will not have lots of leads - Big speakers etc and this cost Â£400!" all you I said was "sucures the salesman saw you coming - buy a Denon or similar and you leave it in your will". A remark that the cordless baby alarm had babies on both channels - "But I paid Â£8 for this and you mean I do not get an exclusive channel?!" These are off the main theme but illistative of the nightmare out there. Cigerettes might be Â£5.50/ Packet but technology is expensive at 20p.
The TVI you quote is the problem of the complainant - you have been warned.
Sorry the doughters of my advice, the public are stupid to the point of holding your foot up and shooting a hole in it.