The majority of work I do is amplifiers repairs, with some fabrication of enclosures and the like. The tools for the electronics tradesman will vary between disciplines. Here I have listed the tools that I believe are necessary for an apprentice starting work in the electronics industry. You will also need something to hold your microphone or SPL meter in one position - like a microphone stand or a camera tripod with the right kind of screw mount to connect to your RS SPL meter.As with any trade, purchasing the right tools for a job in the electronics industry is essential. The recorded SPL will come from the microphone to either your sound card or a USB port. The advantage of HDMI is that you will have extremely linear/flat response (relative to an analog sound card) if you set your preamp/processor to "Pure Audio" mode (or equivalent mode) for your particular preamp. The HDMI connection from your computer to your preamp will provide a drive signal to power your sweeps. This is the simplest setup, and it will get you very good accuracy. If you decide to be a big spender and go for the UMIK-1 microphone ($75), you can avoid the extra sound card and special connector(s) or mixer, and just plug in the cable to the microphone to one of your USB ports. The only disadvantage that I see in the Audyssey microphone is that I didn't see a calibration file online - apparently the guys doing the microphone measurements at AVSForum used the calibration file for a typical ECM8000 microphone. The Audyssey microphone will also work, but it will require a mini-mono headphone/microphone adapter to connect to an external sound card, like the RS meter. Here is a thread describing that device and the cabling/connectors: You will need some sort of sound card in a desktop-based computer, or an external sound card in a laptop computer in order to convert the RS meter's analog output to digital. The RS meter will do as well as a calibration microphone-as good as an ECM8000 or a UMIK-1 calibration microphone-in terms of accuracy of SPL measurements: calibration threads on AVSForum. If it has a stereo jack (apparently a "non-real version" of the RS meter), then I'd recommend the microphone that Ellis posted. You could use the Radio Shack SLM (33-2055), no problem, if it has a mono RCA jack output.
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