Hmm... Had that monitor too, speakers work fine til this day . Bought it 13 years ago.
Why use the jack output on the monitor? The more crap between the audio outputs on the amiga and the speaker the more degraded audio quality.
Why not get a 2xRCA -> female 3.5mm stereojack y-adapter and hook up some pc speakers directly to the amiga.
Even better, hook up a real amplifier+speakers directly to the amiga. Then you wouldn't need that y-adapter only a ordinary 2xRCA->2xRCA audio cable.
