Qts of 0.4 or below indicates a transducer well suited to a vented enclosure. Qts is the resonance characteristics of the electrical and mechanical factors combined and is called the ‘Total Q’ of the driver and is derived from (Qes*Qms)/ (Qes+Qms). Sensitivity (SPL) represents the efficiency and volume expectations at 1W/1M into 2.83V/8 ohms. With this algorithm, values range from 6 to 15%. Note: this algorithm agrees with the manufactures that provide this parameter.Īnother equation for Efficiency 2 (No) = ((157.75*Fs 3*Vas)/(1130 3*Qes))*100. With this algorithm, do not be surprised to only see 2 to 3%.

In most cases this parameter is not provided in the speaker specifications. The ȵ or No parameter is the electrical to acoustical conversion efficiency in percent. Also described as the resonance characteristics of electrical factors of the loudspeaker. Qes is a measurement of the speaker’s electrical suspension system (the voice coil and magnet). Vas represents the equivalent air volume of moving mass as to the compliance (springiness) as the driver’s suspension. Higher Fs indicates a woofer with a higher low-frequency response Lower Fs indicates a woofer with lower low-frequency response The goal is to prevent your enclosure from ‘ringing’. Also known as Fo. The point at which moving parts are balanced. The efficiency calculation requires the following parameters:į s – Resonant frequency of loudspeaker moving mass (in free air). To do this, we need three of the Thiele/Small loudspeaker parameter from the spec sheet.

The reason for this is because you are looking for the most efficient speaker in your price range. My focus personally is on horn loaded designs but we will start with the basics and work our way to my applications. The first thing the selection of your raw speaker and then design around that. These applications are focused on a single cabinet providing a 15 or 18 inch cone speaker for a subwoofer or 10, 12 or 15 inch cone speaker for a two-way cabinets providing the low frequencies below 800 Hz for a point source or line array application. I select the speaker that I need to match my application and the selected amplifier and then build the cabinet to the speaker parameters. When I start a speaker design project, the first item on my list is the selection of the speaker.

Best small speaker enclosure design