I have a Stihl BR500 - I don't know what they cost, but I traded an XR50 for it and a '67 Wheelhorse 10HP tractor. It works great and is very quiet.
The BR500-600 all use the same motor, but tweak around with the carb/exhaust and fan/tube configurations, yielding the differences in performance. The BR500 is the least powerful (3HP vs. 4HP) and also the heaviest by a pound, simply because the exhaust can is BIG and heavy. The payback for the extra pound is a 65dB noise rating, vs 75db for the others. 10dB is a huge difference at over 3 times reduction is sound pressure. It sounds like a sewing machine - no need for muffs and guaranteed to NOT generate a neighborhood mob showing up with torches and pitchforks.
JayC
The BR500-600 all use the same motor, but tweak around with the carb/exhaust and fan/tube configurations, yielding the differences in performance. The BR500 is the least powerful (3HP vs. 4HP) and also the heaviest by a pound, simply because the exhaust can is BIG and heavy. The payback for the extra pound is a 65dB noise rating, vs 75db for the others. 10dB is a huge difference at over 3 times reduction is sound pressure. It sounds like a sewing machine - no need for muffs and guaranteed to NOT generate a neighborhood mob showing up with torches and pitchforks.
JayC