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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: 49662" data-attributes="member: 171"><p>Re: Fulcrum Acoustic FA12, FA15 and FA28 (3 of 4)</p><p></p><p><strong>Acoustic</strong>: (continued)</p><p></p><p>The following gets really interesting because we'll be looking more directly at the time domain differences imparted by the TQ processing. Rich was kind enough to make some L2 presets for the Powersoft K3 DSP amp for me so I could A/B the difference. The TQ processing makes a significant subjective improvement and the measurements bear that out.</p><p></p><p><u>Stage monitor L1 vs. L2 transfer functions for the FA12 with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_Phase_L1_vs_L2.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Impulse response of the FA12 L2 preset with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L2_IR.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Impulse response of the FA12 L1 preset with the Powersoft K3 DSP amp</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_IR.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Rich also made the mistake of sending me the Lake presets for the FA loudspeakers. Only the L2 presets are available at this time since FIR coefficient import is not yet possible with these processors. This is where I started monkeying around with 2nd order all-pass filters to flatten the phase. You'll see that this improved things quite a bit, but it's still a long way from that nearly perfect TQ impulse response. There's obviously more going on with the Fulcrum processing than just phase correction.</p><p></p><p><u>Transfer function of the FA12 L2 Lake preset vs. the flat phase modification</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_L2_vs_FP.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Impulse response of the FA12 L2 Lake preset</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_L2_IR.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>Impulse response of the FA12 L2 Lake preset with flat phase modification</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_FP_IR.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><u>And for good measure (groan), the impulse response of the M1225 self powered wedge</u>:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/FAreview/M1225_IR_StgMon.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>(End Part 3 of 4)</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 49662, member: 171"] Re: Fulcrum Acoustic FA12, FA15 and FA28 (3 of 4) [B]Acoustic[/B]: (continued) The following gets really interesting because we'll be looking more directly at the time domain differences imparted by the TQ processing. Rich was kind enough to make some L2 presets for the Powersoft K3 DSP amp for me so I could A/B the difference. The TQ processing makes a significant subjective improvement and the measurements bear that out. [U]Stage monitor L1 vs. L2 transfer functions for the FA12 with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_Phase_L1_vs_L2.png[/IMG] [U]Impulse response of the FA12 L2 preset with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L2_IR.png[/IMG] [U]Impulse response of the FA12 L1 preset with the Powersoft K3 DSP amp[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_K3_L1_IR.png[/IMG] Rich also made the mistake of sending me the Lake presets for the FA loudspeakers. Only the L2 presets are available at this time since FIR coefficient import is not yet possible with these processors. This is where I started monkeying around with 2nd order all-pass filters to flatten the phase. You'll see that this improved things quite a bit, but it's still a long way from that nearly perfect TQ impulse response. There's obviously more going on with the Fulcrum processing than just phase correction. [U]Transfer function of the FA12 L2 Lake preset vs. the flat phase modification[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_L2_vs_FP.png[/IMG] [U]Impulse response of the FA12 L2 Lake preset[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_L2_IR.png[/IMG] [U]Impulse response of the FA12 L2 Lake preset with flat phase modification[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/FA12_Lake_FP_IR.png[/IMG] [U]And for good measure (groan), the impulse response of the M1225 self powered wedge[/U]: [IMG]http://soundscapesweb.com/files/PSW/FAreview/M1225_IR_StgMon.png[/IMG] (End Part 3 of 4) [/QUOTE]
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