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Amplifiers
VFL 4480.1 - actual output
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<blockquote data-quote="basscube5" data-source="post: 8461006" data-attributes="member: 668183"><p>Figured I'd post another reply. I was a bit quick to slander AB earlier, I did some more testing and based on what I found 2-2500 seems possible.</p><p></p><p>I have a Hantek pc based oscilloscope, gotta love the chinese and their instructions. Anyway, the Hantek works real well but it turns out if you feed it any more than about 34 VAC the tops of the waves flatten out, the same as if it is receiving a clipped signal. I rigged up a voltage divider and all is well now, it reads as high as I want.</p><p></p><p>The power supply is unregulated, no surprise there. The rail voltages are as follows</p><p></p><p>Battery 12.7V, rails +-65VDC (131 VDC P-P)</p><p></p><p>Battery 14.0V, rails +-75V (150 VDC P-P)</p><p></p><p>Unloaded output voltages w/50HZ test tone (Clean sine wave out):</p><p></p><p>Battery 12.8V, 48V out</p><p></p><p>Battery 14.0V, 52V out</p><p></p><p>Just for kicks I hooked up one of the XFLs in free air, obviously it will be a lot different loaded in a box but it's the only load I have. This is a D4 woofer with both coils in parallel. I don't have any giant resistors around. So take these numbers for what their worth:</p><p></p><p>Battery 12.6V, 43V out</p><p></p><p>Battery 14.0V, 48v out.</p><p></p><p>All these readings were with perfectly clean waveforms on the speaker output. If you drive the amp into a soft clip you can add roughly another 5-6V to the output voltages listed above before the tone of the woofer's changed at all. It's no amp dyno I realize but 52V into 1 ohm is 2704 VA if it can keep the voltage up and not fill my trunk with smoke. Not bad for such a small amp.</p></blockquote><p></p>
[QUOTE="basscube5, post: 8461006, member: 668183"] Figured I'd post another reply. I was a bit quick to slander AB earlier, I did some more testing and based on what I found 2-2500 seems possible. I have a Hantek pc based oscilloscope, gotta love the chinese and their instructions. Anyway, the Hantek works real well but it turns out if you feed it any more than about 34 VAC the tops of the waves flatten out, the same as if it is receiving a clipped signal. I rigged up a voltage divider and all is well now, it reads as high as I want. The power supply is unregulated, no surprise there. The rail voltages are as follows Battery 12.7V, rails +-65VDC (131 VDC P-P) Battery 14.0V, rails +-75V (150 VDC P-P) Unloaded output voltages w/50HZ test tone (Clean sine wave out): Battery 12.8V, 48V out Battery 14.0V, 52V out Just for kicks I hooked up one of the XFLs in free air, obviously it will be a lot different loaded in a box but it's the only load I have. This is a D4 woofer with both coils in parallel. I don't have any giant resistors around. So take these numbers for what their worth: Battery 12.6V, 43V out Battery 14.0V, 48v out. All these readings were with perfectly clean waveforms on the speaker output. If you drive the amp into a soft clip you can add roughly another 5-6V to the output voltages listed above before the tone of the woofer's changed at all. It's no amp dyno I realize but 52V into 1 ohm is 2704 VA if it can keep the voltage up and not fill my trunk with smoke. Not bad for such a small amp. [/QUOTE]
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VFL 4480.1 - actual output
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