so one possible cause could be due 2 my peavey speakers.Currently my spk are ceiling mounted(hanging down),I will try to relocate it and if still doesn't work,perhaps its time to replace my speakers.
PS

eavey impulse 652s(passive/made in China)used less than 4 years and cost S$500 a pair(abt US$300).not sure if this is considered a low-end or mid-end model? any comments ?any good recommendations for spk that cost ard US$300/pair?