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<blockquote data-quote="cx-7heaven" data-source="post: 4991231" data-attributes="member: 579914"><p>Pyramid 50 Amp Power Supply</p><p></p><p>8 AWG from supply to batteries</p><p></p><p>Kinetik 2400 Battery</p><p></p><p>Duralast 1000 CA Battery</p><p></p><p>2 AWG between batteries</p><p></p><p>4 AWG from batteries to amp</p><p></p><p>Fluke AC current / voltage meter</p><p></p><p>Sears DMM</p><p></p><p>Measurements:</p><p></p><p>65.8 volts</p><p></p><p>49.2 Amps</p><p></p><p>1.33 ohm calculated rise from 0.6 ohm DCR **</p><p></p><p>3237 Watts</p><p></p><p>14.4 volts rest dropping to 10.75 volts</p><p></p><p>** - Rise was higher than when I tested the 1500D, it was 1.08 ohms for that test. Presumably since my single run of 12 AWG speaker wire is heating up some much due to the extra power. I also did a few test runs at lower volume so the coils were warmer as well.</p><p></p><p>-----------</p><p></p><p>UPDATE ON AUGUST 26 2007:</p><p></p><p>Sean Belanger drove up from SC today with his O-Scope and a bunch of meters.</p><p></p><p>This setup was in my SPL truck with the engine OFF. At this time I have 2x Powermaster D3100s, 1x Kinetik 2400, and 1x DEKA Intimidator hooked up in the truck.</p><p></p><p>I had my trusty 50-amp pyramid supply hooked up to my batteries with 12 AWG wire just to keep them topped off, supply was set to charge at 12.8 volts and no higher.</p><p></p><p>Discovered the following from the testing:</p><p></p><p>1) Power output stays about the same as what I measured above even with a drop to around 11.8 volts.</p><p></p><p>2) Efficiency was high at 0.5 DCR with a rise to 1.32 ohms @ ~80% measured at 3030 watts of output.</p><p></p><p>3) At 0.5 DCR with a rise to 2.08 ohms we measured ~90% efficiency at 2572 watts of output.</p><p></p><p>4) When the amp was dropped down to 0.175 DCR with a rise to 0.82 ohms power only increased to 3450 watts. At this load we had to roll the volume to avoid protection so voltage was dropping to 11.2 volts by the time we got a reading. Efficiency dropped to around ~65 - 70% at this load.</p><p></p><p>5) We could have gotten more "output" from the amp but we stopped increase gain and volume when clipping made the wave-form ragged.</p><p></p><p>My conclusion for the SAZ-3000D is that, even for SPL competition, that dropping under 0.5 DCR won't gain very much. The power gain is small and results in a significant reduction in efficiency.</p><p></p><p>In a Street-A or similar one-battery limited vehicle the 3000D seems to work best for 0.5 DCR with a 2x - 4x impedance rise for maximum efficiency levels, especially if multiple amps were utilized and efficiency were key.</p><p></p><p>That is straight from Jacob. Note the batteries. You do not have enough battery to keep voltage up.</p></blockquote><p></p>
[QUOTE="cx-7heaven, post: 4991231, member: 579914"] Pyramid 50 Amp Power Supply 8 AWG from supply to batteries Kinetik 2400 Battery Duralast 1000 CA Battery 2 AWG between batteries 4 AWG from batteries to amp Fluke AC current / voltage meter Sears DMM Measurements: 65.8 volts 49.2 Amps 1.33 ohm calculated rise from 0.6 ohm DCR ** 3237 Watts 14.4 volts rest dropping to 10.75 volts ** - Rise was higher than when I tested the 1500D, it was 1.08 ohms for that test. Presumably since my single run of 12 AWG speaker wire is heating up some much due to the extra power. I also did a few test runs at lower volume so the coils were warmer as well. ----------- UPDATE ON AUGUST 26 2007: Sean Belanger drove up from SC today with his O-Scope and a bunch of meters. This setup was in my SPL truck with the engine OFF. At this time I have 2x Powermaster D3100s, 1x Kinetik 2400, and 1x DEKA Intimidator hooked up in the truck. I had my trusty 50-amp pyramid supply hooked up to my batteries with 12 AWG wire just to keep them topped off, supply was set to charge at 12.8 volts and no higher. Discovered the following from the testing: 1) Power output stays about the same as what I measured above even with a drop to around 11.8 volts. 2) Efficiency was high at 0.5 DCR with a rise to 1.32 ohms @ ~80% measured at 3030 watts of output. 3) At 0.5 DCR with a rise to 2.08 ohms we measured ~90% efficiency at 2572 watts of output. 4) When the amp was dropped down to 0.175 DCR with a rise to 0.82 ohms power only increased to 3450 watts. At this load we had to roll the volume to avoid protection so voltage was dropping to 11.2 volts by the time we got a reading. Efficiency dropped to around ~65 - 70% at this load. 5) We could have gotten more "output" from the amp but we stopped increase gain and volume when clipping made the wave-form ragged. My conclusion for the SAZ-3000D is that, even for SPL competition, that dropping under 0.5 DCR won't gain very much. The power gain is small and results in a significant reduction in efficiency. In a Street-A or similar one-battery limited vehicle the 3000D seems to work best for 0.5 DCR with a 2x - 4x impedance rise for maximum efficiency levels, especially if multiple amps were utilized and efficiency were key. That is straight from Jacob. Note the batteries. You do not have enough battery to keep voltage up. [/QUOTE]
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