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 July 23rd, 2019, 04:43 AM #1 Newbie   Joined: Jul 2019 From: uk Posts: 1 Thanks: 0 How do I rearrange to find X with this equation? Hi, I have been using the below equation to calculate Watts required to reach a reference level Sound Pressure Level (SPL), however I cannot seem to successfully rearrange equation to find required Lsens. Can anyone help and show me how to rearrange this so that X (or in this case Lsens) is the subject? Equations used to calculate the Watts: dBW = Lreq - Lsens + 20 * Log (D2/Dref) + HR W = 10 to the power of (dBW / 10) Where: Lreq = 105 SPL (required SPL at listener) Lsens = 89dB (loudspeaker sensitivity (1W/1m)) D2 = 2.5m (loudspeaker-to-listener distance) Dref = 1.0m (reference distance) HR = 0dB (desired amplifier headroom) dBW = (ratio of power referenced to 1 watt) W = 249W (power required) July 23rd, 2019, 06:04 AM #2 Senior Member   Joined: Apr 2014 From: UK Posts: 963 Thanks: 342 OK, starting with: dBW = Lreq - Lsens + 20 * Log (D2/Dref) + HR Add Lsens to both sides: dBW + Lsens = Lreq + 20 * Log (D2/Dref) + HR Subtract dBW from both sides: Lsens = Lreq - dBW + 20 * Log (D2/Dref) + HR Tags equation, find, rearrange Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post anaja Algebra 0 April 30th, 2015 06:54 AM russiver Algebra 0 July 12th, 2014 11:29 AM keith6292 Elementary Math 2 January 10th, 2013 12:02 PM Corosane Algebra 4 September 17th, 2012 10:19 PM scaryclairey Algebra 3 December 10th, 2008 06:13 AM

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