Once again, nice build. Your new numbers have got me thinking. I know you're using some custom SS control for amp power, but I've got a couple questions regarding the high current/stable voltage delivery for your rig. I've mentally put some details together from a mixture of things you've posted at different times. Correct me wherever I go wrong; Each amp on it's own dedicated circuit. Is it 20a breaker, 10awg wire, 20a receptacle? I'm interested in all the details if you could furnish them. Breaker size, location, wire sizes, distances etc. Also, have you monitored voltage and current levels during heavy draw periods?
I believe you stated 10awg wire size was used, but what type of plug strip are you referring to that tripped? I've seen power strips exhibit current limiting characteristics, which in turn cause voltage drop that may result in subsequent nuisance tripping. We find ourselves in an environment whereby some plate amps are limited by wall power, and full size outboard amps (like those arc welders you've got) can be extremely demanding on all up-stream components. I can tell you're aware of this, it's just not that often that a rig really has the capability to tax an electrical system.
I'm curious about your SS relay system, and its current handling capability. Obviously, sitting in your room enjoying eight of the finest LF drivers in the world, there isn't any problem. But from afar, as I enjoy reading your component list, it would seem the relay system, really jumps out as a potential weak point in assuring a low loss, high current delivery to your amps. It's certainly a nice slick way to remote the power for the amps, that's for sure. However, I'd be too concerned about potential losses incurred and current limiting from running amplifier line voltage through that device.
No disrespect. This is an epic sub build that elicited the best line I've read in a thread in a long time. "The Maels got China Syndrome and my man just pushes the balls button to git 'er done."
That alone made the entire thing worthwhile for me. Having decades of being around show business, the electrical trade, and of course live pro audio, I've seen electrical failures in nearly every conceivable scenario. From high voltage switchgear explosions and melt-down, to simple receptacles overheating. The vast majority of failures I've been witness to are related to the inability to thermally dissipate in an adequate manner. Oftentimes, this is exacerbated by a very slight amount of added resistance at a connection. I don't think you're in any danger of failure, hell SS relays typically fail closed.
The use of the SS relay in general, doesn't seem like a good idea even in the best operational conditions. When examining the theoretical aspects of the circuit, it exhibits voltage drop and ohmic characteristics that are significant and lossy relative to a hardwired connection. This to me, when considering the entirety of your no compromise, reference quality LF build, seems to be a choke point. However, correct me if I'm wrong.
The Omron device, when ideally heat sinked is rated for 20 amps. Without proper heat sinking, 5 amps. When viewing your photos, it appears to me that the device stands off the inside edge of the 4" square box, due to the adjacent knock-outs being raised. How much does this contribute to proper heat sinking? However much percentage wise this mounting method deviates from the spec of fully heat sinked, that's how much less than optimum the theoretical thermal capability is lessened. Also, I'd think that amp can easily exceed the 20 amp rated limit of the relay triac under some circumstances. The QSC amp, that is the purported model for the Marathon 5050, is also a class H, 5kw design. The QSC 5050 draws 27 amps at 1/3 power pink noise, at 4 ohms, with the ability to draw even more. It's well understood that breakers can easily allow several seconds of many times their rated over-current trip amount to pass without interruption. So the relay triac you're using, and it's limited capacity that's dependent on heat-sinking, clearly appears to be a potential bottleneck. Inherent to all SSRs is a voltage drop during conduction, and a subsequent requirement for heat dissipation.
From an SSR OEM website;
"Solid state relays have no moving parts so there is no mechanical reason why they should fail. However, traditional solid state relays (and other modern electronics) may be damaged by three local installation reasons -- over voltage power surges, over current due to inrush or improper fusing, and over temperature due to poor thermal dissipation. If you plan for these three situations, you will remove the vast majority of solid state relay failures."
Failure, isn't a big deal, because as I stated, they normally fail closed,..so no biggie. I'm curious if you feel that there may anything to my theory about current limiting.
This build in general, and your sub rig more specifically, will be quite the reference in discussion here at AVS, and elsewhere for some time. Hell, it already started. There is references all over AVS to this build. Your room is kick ass too. The ~25 foot width is just great, and so conducive good lateral characteristics, and lessen problematic sidewall interactions. It just all adds up to a kick ass combination.
Anyway, I'm curious if you've given much consideration to this. Those relays do possess enough voltage drop and power consumption that on peaks, they'd hit 30 watts or more. It doesn't seem like much, and it isn't really, but when a single pole switch could do the job with no voltage drop and current limiting, I would go with the switch. Or just use the front panel switch. IMO, it just sticks out in an otherwise balls out build.
Killer build, and those measurments are, uh, solid
There will be references to this for quite some time.