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Discussion in 'Archived Threads 2001-2004' started by AllanN, May 10, 2002.
I stumbled accross this thread that had SPL readings listed like this
That's probably what they're doing. First you choose a median level (say 80db of SPL) and then play tones for each freq and measure how far above of below the 80db mark the tone is.
Many people do this, graph the response of their rooms (oddly, this has been a common "advanced" practice for years, but seems to now have trickled down to the dabbler crowd). Serach the speakers area for "House Curve" or "BFD".
One thing to note when doing so is that this technique of using sine wave and a spl meter is usually only effective for sub freq- as complexities of stereo speakers often make it more accurate to EQ with pink noise and an RTA. You can "graph" the upper stuff with tones- but if you're planning to use the graph to design an EQ- I'd start with the sub as it will be easiest.
The second thing is, the RS meter is a bit inaccurate in low freq-- so there is a correction chart available to let you know how to adjust your SPL readings at a given tone.