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VVME audiopipe clones cheap!
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<blockquote data-quote="zinda" data-source="post: 8059566" data-attributes="member: 633054"><p>I did one last test run on the QA-D1500 Amp, by using a different head unit and a single sub in a box. Set up the system in my garage with a brand new Bosh 850 CCA Battery. I wanted to be able to see all settings easily and look at the sub movement. I was hoping that it was just incompatible with my mounted HU, the results were the same, the sub moves quite a bit but hardly any sound. Sounds like it's only reproducing tones below 20Hz, ran the RCA out from a full frequency output, tried adjusting all pots with minimal of change. Then I hooked up 1 of my old VR3 amps as a control to compare with and once again night and day, so much more sound I could not turn it up since it was after 11pm when I did this, had no problem cranking up the VVME without worries of complaints.</p><p></p><p>My conclusion is that the amps are not designed correctly or there may be a problem with the crossover on this amp. I have a scope but not exactly sure how to test for frequency to find the roll-off of the output. My Fluke also can test for Hz but it needs pure tones to work.</p><p></p><p>If I used a test CD that has a tone generator I think I can use either the scope or fluke easily to find out, I don't have a tone generator nor do I have a disk with this type of recording.</p><p></p><p>I'll be sending it back tomorrow.</p></blockquote><p></p>
[QUOTE="zinda, post: 8059566, member: 633054"] I did one last test run on the QA-D1500 Amp, by using a different head unit and a single sub in a box. Set up the system in my garage with a brand new Bosh 850 CCA Battery. I wanted to be able to see all settings easily and look at the sub movement. I was hoping that it was just incompatible with my mounted HU, the results were the same, the sub moves quite a bit but hardly any sound. Sounds like it's only reproducing tones below 20Hz, ran the RCA out from a full frequency output, tried adjusting all pots with minimal of change. Then I hooked up 1 of my old VR3 amps as a control to compare with and once again night and day, so much more sound I could not turn it up since it was after 11pm when I did this, had no problem cranking up the VVME without worries of complaints. My conclusion is that the amps are not designed correctly or there may be a problem with the crossover on this amp. I have a scope but not exactly sure how to test for frequency to find the roll-off of the output. My Fluke also can test for Hz but it needs pure tones to work. If I used a test CD that has a tone generator I think I can use either the scope or fluke easily to find out, I don't have a tone generator nor do I have a disk with this type of recording. I'll be sending it back tomorrow. [/QUOTE]
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