Originally Posted by Mark Seaton
My question was how close the circuitry of these clones are to the actual LabGruppens beyond the cosmetic likeness. My understanding was they are rather close and was simply asking if anyone could confirm.
I dislike wading through threads with hundreds of pages myself, but this has been discussed in the clone thread. Judge for yourself. You can see the similarity in layout, but no way are the boards interchangeable:
I have "clones" that are much more substantially different in circuitry, but they are laid out the same as most any amp (transformer, rectifier, cap reservoir, amp boards, output devices and I/O), they just have a SMPS, some have PFC, some don't, they have varying amounts of cap reservoir, all sorts of 'protection circuitry', etc.
Yes protection is irrelevant if you always stay within the amps limits. Real program material into a real driver impedance is very different than a dummy load bench test.
We've always agreed on this point, but some people have the wrong way around.
Sounds like a design quirk/flaw important to know about with a work around. Hopefully most know that.
It is not a design flaw. For pro sounders, it's not relevant, so it never comes up.
Brian's comparisons make a lot of sense in the pro world where most of his amps are sold and used. Most companies would have the amps running 1-4 subs per channel, where the comparison for internal power is one plate amp per 1-2 boxes. SpeakerPower does offer a 2RU version with 2 amplifier channels (not bridgeable) for more direct comparison.
Depending on the load, a pair of 4kW or more appropriately a pair of the 6kW amps powered at 220V should make a very good comparison, of course these 2 SpeakerPower amps are optimized for 2 Ohm operation and should be considered in that light.
Unlike the clone amps, the SpeakerPower amps can be purchased directly from the english speaking designer and manufacturer, with the amplifiers being manufactured here in the US all the way back to the circuit boards. Any failures that might be encountered are resolved by shipping of an 8-20 lb amplifier back to southern CA. Some will find value in that, others won't.
Value is more likely to be found in 4xFP14000 clones vs 2-SP1-6000 at the same price. IMO, failures come mostly from user-error, as with most any product of any kind.