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<blockquote data-quote="Ekeko" data-source="post: 3556052" data-attributes="member: 581297">Hi,I found this equation for calculating desired power for a given SPL:dBW = Lreq - Lsens + 20 * Log (D2/Dref) + HRW = 10 to the power of (dBW / 10)Where:Lreq = required SPL at listenerLsens = loudspeaker sensitivity (1W/1M)D2 = loudspeaker-to-listener distanceDref = reference distanceHR = desired amplifier headroomdBW = ratio of power referenced to 1 wattW = power requiredIf I run the&nbsp; V3 at 2mt (ap.7ft) for 85 db and 1005 W I get about 106 db (you would need to add cabin gain, but because is constant for both we can just ignore it...)The v2 (splo 89.5 + 3 from porting) at the same loudness (106 db) uses only 179 watts.That&#039;s why proffesional speakers usually have to be very sensitive (think Electrovoice).It seems to me that giving up 7.5 db will demand an amp that is about 5 times bigger for the same spl...now, the v3&#039;s only handle 2X as much power than the v2s...I must be missing something because many people report that v3&#039;s play louder than v2s but it would seem to me that they would need to be of MUCH higher power handling do so...any engineers here know what could I be missing?</blockquote>

[QUOTE="Ekeko, post: 3556052, member: 581297"] Hi, I found this equation for calculating desired power for a given SPL: dBW = Lreq - Lsens + 20 * Log (D2/Dref) + HR W = 10 to the power of (dBW / 10) Where: Lreq = required SPL at listener Lsens = loudspeaker sensitivity (1W/1M) D2 = loudspeaker-to-listener distance Dref = reference distance HR = desired amplifier headroom dBW = ratio of power referenced to 1 watt W = power required If I run the V3 at 2mt (ap.7ft) for 85 db and 1005 W I get about 106 db (you would need to add cabin gain, but because is constant for both we can just ignore it...) The v2 (splo 89.5 + 3 from porting) at the same loudness (106 db) uses only 179 watts. That's why proffesional speakers usually have to be very sensitive (think Electrovoice). It seems to me that giving up 7.5 db will demand an amp that is about 5 times bigger for the same spl...now, the v3's only handle 2X as much power than the v2s...I must be missing something because many people report that v3's play louder than v2s but it would seem to me that they would need to be of MUCH higher power handling do so...any engineers here know what could I be missing? [/QUOTE]

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