Home Theater Questions? Ask a Technician for Answers ASAP
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, is the described symptom of "...not delivering certaing mid frequencies..." commonly exhibited on any source; AM, FM CD, PHONO others?
Have you tried using a pair of headphones?
...and with a different pair of speakers?
Appreciate the post back.
The reason for trying with a different speaker pair is as a test by process of elimination. It may not be a Sherwood RX-4109 issue.
Have you checked the suspension/edge of the Bose woofers? ...gently pushing and releasing the cone?