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Fulcrum Acoustic FA12, FA15 and FA28 (1 of 4)
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<blockquote data-quote="Langston Holland" data-source="post: 49659" data-attributes="member: 171"><p>Re: Fulcrum Acoustic FA12, FA15 and FA28 (2 of 4)</p><p></p><p><strong>Measurements</strong>:</p><p></p><p>I made two types of measurements, one on the ground plane to simulate full range use and the other in stage monitor position that resulted in the most upward angle. A smooth cement surface was used for both, a loudspeaker to mic distance of 20' was used for the full range measurements. The loudspeaker to mic distance varied with the stage monitor measurements depending on the size of the box, but the mic was at ear position and perpendicular to the cabinet's on-axis. There was no wind, almost no environmental noise, a B&K 4007 mic was used, temperature was 14C, relative humidity was 60%. It was so perfect I measured much of my inventory until I couldn't stay awake any longer. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>You'll notice the typical 250Hz dip in the responses in the stage monitor measurements due to a second arrival from the ground bounce that is a half wavelength late to the party. That isn't avoidable unless you made the cabinet a half sphere or bury it with its face flush to the stage surface. No one's ever bothered going to those lengths partially because that suck-out happens to sound good with a vocal mic. It can reduce the muddiness of the mix for the musician. Whatever the case, don't try to use EQ to fill in that hole because it'll dig just as deep as you boost as the woofer approaches the threshold of smoke.</p><p></p><p><strong>Electrical</strong>:</p><p></p><p>The following two measurements are of FA12 presets with the Powersoft K3 DSP amp.</p><p></p><p><u>Below illustrates the complexity of the L1 relative to the standard L2 presets</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_vs_L2.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>EQ differences between the full range and stage monitor L1 presets</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><strong>Acoustic</strong>:</p><p></p><p><u>Full range vs. stage monitor transfer functions of the FA12 with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_FullRng_vs_StgMon.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Full range vs. stage monitor transfer functions of the FA15 with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA15_K3_L1_FullRng_vs_StgMon.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Full range vs. stage monitor transfer functions of the FA28 with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA28_K3_L1_FullRng_vs_StgMon.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Ground plane vs. stage monitor transfer functions of the M1225 self powered wedge</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/M1225_Phase_GndPln_vs_StgMon.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>(End Part 2 of 4)</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 49659, member: 171"] Re: Fulcrum Acoustic FA12, FA15 and FA28 (2 of 4) [B]Measurements[/B]: I made two types of measurements, one on the ground plane to simulate full range use and the other in stage monitor position that resulted in the most upward angle. A smooth cement surface was used for both, a loudspeaker to mic distance of 20' was used for the full range measurements. The loudspeaker to mic distance varied with the stage monitor measurements depending on the size of the box, but the mic was at ear position and perpendicular to the cabinet's on-axis. There was no wind, almost no environmental noise, a B&K 4007 mic was used, temperature was 14C, relative humidity was 60%. It was so perfect I measured much of my inventory until I couldn't stay awake any longer. :) You'll notice the typical 250Hz dip in the responses in the stage monitor measurements due to a second arrival from the ground bounce that is a half wavelength late to the party. That isn't avoidable unless you made the cabinet a half sphere or bury it with its face flush to the stage surface. No one's ever bothered going to those lengths partially because that suck-out happens to sound good with a vocal mic. It can reduce the muddiness of the mix for the musician. Whatever the case, don't try to use EQ to fill in that hole because it'll dig just as deep as you boost as the woofer approaches the threshold of smoke. [B]Electrical[/B]: The following two measurements are of FA12 presets with the Powersoft K3 DSP amp. [U]Below illustrates the complexity of the L1 relative to the standard L2 presets[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_vs_L2.png[/IMG] [U]EQ differences between the full range and stage monitor L1 presets[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1.png[/IMG] [B]Acoustic[/B]: [U]Full range vs. stage monitor transfer functions of the FA12 with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_FullRng_vs_StgMon.png[/IMG] [U]Full range vs. stage monitor transfer functions of the FA15 with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA15_K3_L1_FullRng_vs_StgMon.png[/IMG] [U]Full range vs. stage monitor transfer functions of the FA28 with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA28_K3_L1_FullRng_vs_StgMon.png[/IMG] [U]Ground plane vs. stage monitor transfer functions of the M1225 self powered wedge[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/M1225_Phase_GndPln_vs_StgMon.png[/IMG] (End Part 2 of 4) [/QUOTE]
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