A speaker has an annular magnet structure. The method further includes the steps of determining a noise transmission loss across the power steering hose assembly using the acoustic response, determining whether the transmission loss meets a predetermined noise criteria and modifying a design parameter for the power steering system if the transmission loss does not meet a predetermine noise criteria. The temperature control functionality may operate to control the transmit power, the throughput or other operating parameters associated with the access point. The sensor may be configured to measure a first sample attribute value of the first sample flow and a second sample attribute value of the second sample flow. A detection circuit coupled to the field effect sensor detects and responds to the disturbance to the electric field. The methods comprise administering a local anesthetic and alpha adrenergic receptor agonist to induce local anesthesia followed by reversing anesthesia with a low dose of an alpha adrenergic receptor antagonist.