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Reason? Because almost any subwoofer can play loudly at 63hz. And some play SO loudly, that the 63hz figure can distort the overall output(avg)
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The 25-50Hz figure towards the right of some of the models indicate a data manipulation where the 63Hz data has been eliminated eliminated. 
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The figure in the parenthesis will reflect a 25-50hz(25,31,40,50hz) average. This was performed with all of the models that I had accurate 63hz output for.
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across the lower frequencies. For example...if subwoofer *X* hit...
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25hz - 95dB
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31hz - 100dB
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40hz - 105dB
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50hz - 110dB
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63hz - 115dB 
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63hz - 115dB 
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the *AVG* = 105dB. This seems pretty good...until we look a little closer and see the 63hz output is 20dBs higher than the 25hz output!
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All figures are for a corner loaded subwoofer, measured at a 2 meters using 10% thd limits in a large 7500 cu-ft room.
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The SPL numbers have been averaged from the maximum output(with a 10% thd limit) using 25,32,40,50,62hz steps
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in testing(the 25-62hz range is considered the bass intensive film range).
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Subwoofer25-62Hz average16Hz20Hz25Hz32HzFrequency Response25-50Hz average
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Genelec HTS6118dB90.5dB105.5dB109.5dB117dB25-100Hz +/-2.7dB116.3dB
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Stryke Power 15 prototype115.4dB99dB102dB106dB119dB28-112Hz +/-8.9dB115.3dB
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Velodyne 1812 Signature 113dB101.1dB103.9dB107.6dB114.8dB25-68Hz +/-2.4dB111.6dB
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Niles PRO15SW113dB89dB32-100Hz +/-2.8dB
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Epik Conquest112.9dB104.7dB109.3dB112.3dB115.5dB26-133Hz +/-4.5dB112.8dB
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Klipsch RSW-15112dB 97dB112dB48-115Hz +/-2.1dB
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Velodyne F1800 MkII 111.9dB 90.5dB
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Exodus Audio’s WMD 15111.3dB70dB93dB104.8dB115.2dB111.3dB
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Energy S12.3110db86.9dB105.7dB113dB29-113Hz +/-2.2dB109.5dB
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SVS 20-39CS(300W Fidek amp)109.5dB91db105.8dB114.9dB25-75Hz +/-2.5dB
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Velodyne FSR-15109.1dB90.1dB95.5dB103.1dB109.8dB108.8dB
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Paradigm Signature Servo109dB88dB98dB24-75Hz +/-2.2dB
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Triad Gold PowerSub w/RackAmp 500109dB84dB97dB110dB24-117Hz +/-2.3dB
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PSB SubSeries 6i109dB95dB108dB27-119Hz +/-2.4dB
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Klipsch KSW300 109dB92dB107.3dB
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Mission 700AS108.1dB 102dB111.5dB27-114Hz +/-5.7dB106.8dB
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JL Audio Fathom F112108dB80dB24-101dB +/-2.5dB
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PSB Subsonic 6i108dB93.8dB103.1dB110.1dB30-118Hz +/-2.5dB107.4dB
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Paradigm Seismic 12108dB87dB25-117Hz +/-3.5dB
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Klipsch RW-12d108dB86dB98dB107dB35-105Hz +/-2.1dB106.8dB
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Paradigm PW-2200108dB84dB28-117Hz +/-2.4dB
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Outlaw LFM-1108dB83dB97dB113.4dB30-73Hz +/-2.0dB107.7dB
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Velodyne DLS-5000R108dB91dB110dB35-100Hz +/-2.8dB106.5dB
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B&W asw1000 107.9dB 96dB
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Adire Audio Dharman107.9dB 96dB102dB114.6dB106.5 dB
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Velodyne HGS-15107.7dB89.1dB102.1dB
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NHT U1(w/A1 amp) 107.6dB99dB50-185Hz +/-2.2dB
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Paradigm Servo 15 107.3dB
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Velodyne CHT-15107.3dB 92dB108.4dB30-101Hz +/-2.3dB105.1dB
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Hsu Research VTF-2(in max extension)107.1dB 93dB25-82Hz +/-3.2dB106 dB
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Velodyne SPL-1200107.1dB 73dB98dB27-90Hz +/-1.7dB
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Hsu Research TN25(w/250w)107.1dB 96dB30-82Hz +/-2.6dB106 dB
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BW asw2000 107dB105.3dB
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Cerwin Vega cvt300s 107dB 80db92dB106 dB
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Outlaw LFM-1EX (max output mode)107dB93dB110dB26-94Hz +/-2.3dB
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Klipsch RT-12d107dB91dB105dB110dB46-108dB +/-1.9dB
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Infinity SW-12107dB84.5dB96.4dB109.3dB35-78Hz +/-2.3dB106dB
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Cerwin Vega CVHD-12S107dB106dB40-89Hz +/-2.4dB
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Velodyen SCS-10/SC1250 (dual subs)106.5dB88.8dB28-185Hz +/-2.0dB
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Cerwin Vega LW12 106dB 89dB60-115Hz +/-1.5dB103.4dB
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Polk PSW-650105.6dB 84.3dB90dB40-123Hz +/-2.1dB103.6dB
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Infinity Intermezzo 1.2s105.5dB80.1dB90dB95dB30-118Hz +/-2.1dB
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M&K MX125 MkII105.3dB88.9dB91.5dB25-120Hz +/-2.2dB
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Velodyne CT-150 105.3dB 82dB103.9dB
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JBL PSW-D112 105.2dB 95dB32-82Hz +/-2.9dB
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HSU VTF-3 MkIII Turbo105dB83dB93dB95dB107dB24-92Hz +/-2.3dB104dB
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SVS PB12-NSD105dB96dB102dB109.4dB34-78Hz +/-2.0dB
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Canton AS 850 SC105dB86dB104dB36-79Hz +/-2.3dB
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Aperion Intimus S10105dB77dB37-110Hz +/-2.2dB
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Boston Acoustics HPS 12HO105dB97dB23-86Hz +/-1.9dB
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JBL S120PII105dB76.4dB86.9dB107.8dB37-80Hz +/-2.2dB103.5dB
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KEF PSW2150105dB94dB35-90Hz   +/-1.8dB
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Infinity Alpha 1200s105dB85dB39-112Hz +/-2.1dB
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Boston Acoustics PV800 104.4dB85dB103dB
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Acoustic Energy AE 308 104.1dB 95dB38-155Hz +/-2.8dB
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Jamo C80 Sub104dB 89dB27-195Hz +/-2.2dB
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Definitive Tech. PF15TL+ 104dB 88dB31-120Hz +/-1.7dB
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JBL L8400P104dB 85dB37-110Hz +/-2.1dB
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Mission AS700i104dB82dB36-105Hz +/-3.5dB
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Axiom EP500104dB 80dB110dB28-98Hz +/-2.1dB
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Energy S10.3104dB 84dB
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Infinity MSW-1104dB79dB31-131Hz +/-2.9dB
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Velodyne DD-12104dB 78dB22-71Hz   +/-2.1dB
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Russound SUB105104dB 92dB104dB39-117Hz +/-2.3dB
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Crystal Acoustics THX-12SUB104dB 91dB39-116Hz +/-1.8dB
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Polk PSW-505104dB 90dB30-98Hz +/-3.2dB
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JBL Cinemavision CVSUB50104dB 88dB39-122Hz +/-1.8dB
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JBL ES250P104dB 86dB105dB34-103Hz +/-1.9dB
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Aperion Intimus S12104dB 84dB37-82Hz +/-2.2dB
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PSB Subsonic 3i 104dB 28-132Hz +/-3.0dB101.3dB
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Phase Technology PC500(towers) 103.6dB
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Infinity IL100s103.5dB 79.2dB94dB47-131Hz +/-2.0dB
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B&W ASW-750103dB92dB31-79Hz +/-1.9dB
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Thiel SS2103dB74dB17-76Hz   +/-1.9dB
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NHT XdW103dB85dB32-104Hz +/-1.9dB
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Mirage Omni S10103dB83db29-106Hz +/-2.5dB
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Velodyne DPS-12103dB80.4dB90.4dB106.5dB36-108Hz +/-2.2dB101.7dB
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Atlantic Technolog 642SB103dB79dB29-196Hz +/-4.7dB
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Klipsch RW-10103dB77dB39-97Hz +/-1.9dB
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RBH MS-10.1103dB76.8dB94.9dB102.7dB46-172Hz +/-2.4dB100.9dB