Buy.com has the Belkin PureAV Power Conditioner PF30 - 8 Outlets Surge Suppressor for $80 with free shipping. It uses Multi-Phase PureFilter Circuitry to deliver the most pampered electricity your home theater has experienced. [BizRate]
#5, to some extent I'm sure UPSs do some amount of filtering. They certainly have some capacitance value which will filter some HF just like a transformer, but again it is just 1st order and who knows exactly how much effective value there is. I'm not sure how well tied the battery is to the circuit, but batteries can also act as filters (they're particularly effective in cars, but that's DC-DC). UPSs aren't specifically built for "power conditioning".
I really don't think most people need one of these "power conditioners". If you're not sure, you don't need one. Get a surge protector for your electronics, or an UPS if for your computer if you are worried about power outages and losing data.
I kinda doubt that much noise really makes it through the power supply stages of your amplifiers anyways. Seems kinda questionable to start, but I'm not an expert.
Need the Shampoo to go with this.
The best power filter is a transformer. It separate the source from the output. This way any imperfection won't affect the output as much.
Transformers are only first-order lowpass filters which will filter some HF noise out, but they are not what I would call a power filter by any means.
i never had any problems with power spikes killing my electronics. is this common?
#3 a power conditioner is not for spikes. It's to prevent noise or distortion from coming out of your (expensive) speakers.
Do UPS condition the power? I've got them on all my electronics for power drops and spikes, but hadn't thought about other noise.
#5, to some extent I'm sure UPSs do some amount of filtering. They certainly have some capacitance value which will filter some HF just like a transformer, but again it is just 1st order and who knows exactly how much effective value there is. I'm not sure how well tied the battery is to the circuit, but batteries can also act as filters (they're particularly effective in cars, but that's DC-DC). UPSs aren't specifically built for "power conditioning".
I really don't think most people need one of these "power conditioners". If you're not sure, you don't need one. Get a surge protector for your electronics, or an UPS if for your computer if you are worried about power outages and losing data.
I kinda doubt that much noise really makes it through the power supply stages of your amplifiers anyways. Seems kinda questionable to start, but I'm not an expert.