Stub Mandrel Posted 5 hours ago Share Posted 5 hours ago TL:DR - I fixed up some speakers. I have two cheap Thomann Fun Generation powered 15s and a pair of Passive 12s as extensions. I've realised that a powered 15 and a powered 12 would give me more flexibility (you can work out the combos, but being able to use 2x12s as monitors while still being able to run a 12 and a 15 each side as a small PA appeals). Using a Powered 15 and a passive 12 as monitors was clumsy, the 15 is noticeably more bulky. Luckily the rear panels have identical dimensions, so it's simply a case of swapping them over and switching the spade connections to the 12 and hard-wiring the 15. ON opening up a powered 15, I noticed that the board doesn't have the built-in crossover, instead using a separate crossover like the 12, connected from the L (low) terminals. I noticed that as expected there was a red wire from + on the speaker and a black from -, but they were connected to L- and L+ instead. I was going to reverse them... until I noticed the wires to the speakon connector from the power amp were also reversed... I did a phase check against (correctly wired) extension speakers and lo and behold, it appears the power amp board is incorrectly marked. Incidentally, despite the 15 being rated at 115db and 70-18,000 Hz and the 12 114dB and 80-18,000Hz, the spate of A/B testing that this exercise brought on showed that the 15s have vastly more bottom end to my ears. Quote Link to comment Share on other sites More sharing options...
itu Posted 3 hours ago Share Posted 3 hours ago 2 hours ago, Stub Mandrel said: Incidentally, despite the 15 being rated at 115db and 70-18,000 Hz and the 12 114dB and 80-18,000Hz... Every dB and Hz means a lot in the low end. Those quoted frequency bands should also include the limits: ±3, or ±6, or maybe ±10 dB? If they are measured with different limits, you cannot compare the results. Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted 1 hour ago Author Share Posted 1 hour ago 1 hour ago, itu said: Every dB and Hz means a lot in the low end. Those quoted frequency bands should also include the limits: ±3, or ±6, or maybe ±10 dB? If they are measured with different limits, you cannot compare the results. Thomann's specs are more honest than most (they even state the '600W cabs' are 15W RMS). That said, I suspect the perfomance figures are largely 'theoretical'. Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted 1 hour ago Share Posted 1 hour ago 1 hour ago, itu said: Every dB and Hz means a lot in the low end. Those quoted frequency bands should also include the limits: ±3, or ±6, or maybe ±10 dB? If they are measured with different limits, you cannot compare the results. they are both -3dB 1 Quote Link to comment Share on other sites More sharing options...
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