Port size and efficiency, is there such a thing as "too much"?

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#41
Crashpc said:
I wonder if it would be better and more interesting to make powerfull oscilators instead of full amps. You´d only need very basic output unit with filters (SMPS) and a timer.
Well, with 95% efficiency, you´d burnt 1kW with 20kW amp. That´s a lot of heat to go, but the outer case would manage. Now 6,5x that, I´m not sure. And even short term bursts would be crazy demanding on stuff inside.
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"Tone generators" are strictly prohibited as is anything that's not available through normal retail channels. So no uniqe/homemade/prototype equipment allowed. Pretty much if you did something like that and started winning someone would declare shenanigans on you. Also I don't believe any org allows battery/system voltave over 18.1V.

Like I said, I wouldn't trust 100,000W amp as far as I could throw it, but who knows? Other Brazilian amps seem almost magical in their ability to make a crapload of power in a small footprint at high efficiency. And to repeat, reliability has been a bit dubious. That said, at the super extreme levels people plan to blow things up every time they compete. A new windshield, a few subs, and amp or two breaking is all in a day's work for the guys who are at the top of the leaderboards.


head_unit said:
I wonder if instead of all these ports, maybe a massive sealed array could be advantageous. Huge impedance peak = low current, and some kind of high voltage resonator.
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Again, non-traditional amps are going to not be allowed and sealed boxes haven't been competitive since the late 90s when people started experimenting with ports. I don't think anybody even broke 160dB (and that was on the old audiocontrol meter which was generous) with those huge sealed arrays (like 64 12" woofers). Brute forcing with cone area and power strategy was proven ineffective some time ago.

I'm not getting into any carpentry this week since there's a competition next Saturday and I don't think I can get this done in time, so probably after next weekend I'll break out the saws and get cracking on this. I've got a friend coming to help me paint the house here and if we can knock that out quickly I'll have an extra set of hands for a few days.
 
#42
hispls said:
Actually it looks like they're marketing one that can produce 150,000W into 1/4 ohm

https://produto.mercadolivre.com.br...kw-150000-rms-t150-t-150-hv-alta-voltagem-_JM

Again relying on 300V DC from batteries. Still leaves you gobs of power at 4 ohm and these are short money. I wouldn't mess with that high DC voltage on a dare though! Hard to find much about the biggest ones in English, but there's a couple guys in the USA running some of their "smaller" high voltage offerings and raving about how great they perform.
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300V DC? Things have changed since I dabbled in car audio 10+ years ago.
Some quick math for 150kw into 0.25 ohm. That's 194v and 775 amps into 0.25ohm!:whazzat:

Let's assume the amp is 94% efficient which would be quite good. Let's call it 160kw needed for the amp to put out 150kw. With a 300v source the amp would need to pull on the order of 535 amps from the batteries.

Are there any gut pics of this amp?
 
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