Hi,my original v2 400 has a constant hissing noise from the satellites now. Was working great for 22 years until now.
is this usually a capacitor problem?
I removed the amp, and I think I see a slightly bulging 47uf 50v cap, but I'm too uninformed to know if this is what might be causing the issue.
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The bulging capacitor should definitely be replaced. I recommend using Panasonic FR replacements. If you had a 4.1 (with the push button switch), I would look for charred adhesive on the bottoms side of the circuit board inside the control pod/preamplifier, which can cause white noise. There are two other 47 uF 50v capacitors in the amplifier panel that are almost certainly degraded, which should also be replaced. I expect you have other degraded components, such as a 2.2 uF electrolytic capacitor, and possibly a zener diode. Other capacitors are also likely degraded, but would not typically cause the hiss your describe (e.g., 63v 470 uF). You can find a kit on ebay with those parts, titled "Klipsch ProMedia 4.1 v.2-400 Parts Upgrade Kit Computer Speakers Repair". (You'll recognize who produces it). If you have not checked the foam surrounds in recent years, pulling the 6.5" grills will let you see if the foam is brittle. You should be able to touch and gently press the foam without it creasing or crumbling. Contact me if you would like info about some matching refoam kits, or having me refoam the speakers for you. Klipsch uses 6 ohm impedance, so you don't want to use 4 ohms, and 8 ohms will decrease the performance. Ebay listing number 332229420536 has photos showing how to remove the grills without destroying them.
I don't know where you can find newer compact systems with the power and clarity of the ProMedia v.2-400/4.1 and 5.1, with their four output MOSFETs per channel. I hope this helps.