DJStubbs wrote: ↑
Wed Aug 15, 2018 3:49 pm
Sorry yes I meant the 12c seems to have more output. I only have 4 cabinets that have regular lab12s out of 10.
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Bill Fitzmaurice wrote: ↑
Wed Aug 30, 2017 5:37 pm
That applies to the Lab 12, which is a 6 ohm driver. The limit on the 4 ohm Lab 12C is 45 volts.
If you're running dual loaded lab12c cabs to the same limit as regular lab12's then, if your current limit is 90V, then you are
running the lab12c lab loaded cabs to their limit!
At 90V for the regular lab12 cabs, there's still room for more voltage, so they are not as loud, they are not hitting their limit.
That's why the lab12C loaded cabs are hitting harder!
Here's why you should replace all the 12C's with regular lab12's:
2 x dual loaded lab 12 serial wired cabs, wired together in parallel, is a 7 ohm load. That is what the amp "sees".
100V (the voltage displacement limit) at 7 ohms (or 1429W) on a amplifier should also have a pull of 12.5 amps on each channel.
2 x dual loaded lab12c serial wired cabs, wired together in parallel, is a 5 ohm load. That is what the amp "sees".
90V (the voltage displacement limit) at 5 ohms (or 1620W) on an amplifier should also have a pull of 18 amps on each channel.
Yep, the voltage limit is lower for these cabs, but you need more power for them to be as loud!
While Watts isn't a whole lot greater between the 2, amps is significantly higher.
It's better for the amps and the cabs to be operating somewhere near 8 ohms, than it is to be operating somewhere near 4 ohms, especially when you're doing it like you do, for 12 hours at a time...