I just bought the ATP headphone adapter, radio shack inline volume control #4200964, 1/4 to 1/8 adapter and some Phillips Action Fit earbuds. Hooked everything up but get sound thru detector speaker and no sound thru the ear buds. Any ideas why it won't work? Is there a certain power level to the earbuds that is required? These have 16 ohm impedance Is that not enough to disable the detector speaker and allow sound thru the earbuds? Could the ATP adapter or the inline volume control be bad? Appreciate any help anyone can offer