Let me start by describing my current setup.
Polk SDA 2b's (the signature series, w/ only 2 mid's)
Marantz 2270 (newly recapped and serviced)
Pioneer Pl-700 tt
Generic dvd/cd player
The system sounds great, and I am very pleased with its performance, EXCEPT at high volumes. I'm a young guy, and occasionally when I'm listening to loud music, it demands to be played louder than normal listening volume. By loud, I mean that I will turn the receiver's volume knob past the half way point, but anything with a beefy base or midrange sound, like rock will seemingly cause a cracking sound. This sound happens on both speakers, but not synchronized. It occurs during "louder" bass passages, and when I increase the bass knob on the receiver it exacerbates the cracking, meaning that it happens with more frequency.
I am trying to determine if I am experiencing a speaker issue or a power supply issue. Is this due to the fact that the speakers are being pushed to their capacity? Or is this caused by the receiver failing to deliver the necessary power. Or, could my rather old house be failing to deliver enough voltage? Or is there some corrosion, or failure in one of the receiver's components, or are cross overs getting old?
I was told that the marantz 2270 is a powerful receiver, but these polk sda 2's don't seem too wimpy either. Also, I am using 14 gauge, good quality speaker wire, so I wouldn't think that to be a limiting factor.
I am too inexperienced to know. I asked my stereo technician, and he said there were too many variables for him to diagnose the problem over the phone. I thought I'd put it you guys on the forum for any suggestions.