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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th July 2006, 04:24 PM   #21
BWRX is offline BWRX  United States
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The 3600VZs are only 55lbs each not 100. But they can drive load impedances down to 1ohm when wired up properly. You also mentioned "with sufficient power source" - that's a pretty important issue in pro audio. You need lots of power to make lots of power
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Old 20th July 2006, 05:07 PM   #22
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Fredos - when are you going to start selling DIY modules? (So I can build some into speaker cabinets)

What kind of mains do you run to those amps in the rack?
Is there multiple dedicated lines in the rack?

This is great stuff and I hope to see more and more d-amp around. More reference accounts.
 
Old 20th July 2006, 05:13 PM   #23
fredos is offline fredos  Canada
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DIY is a small market compare to multi KW amplifier! Maybe when I got more time, I will enjoy it!

A 120V/15A circuit is feeded to each channel of the power amp, so 12X 120V/15A is provided to the power amp... Nice power!

Fredos

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Old 20th July 2006, 07:12 PM   #24
Pano is offline Pano  United States
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Quote:
Originally posted by fredos
A 120V/15A circuit is feeded to each channel of the power amp,
Are you sure about that Fredos?

That doesn't seem like enough to me. My 1st reaction to that was "not enough!". Those are just standard household circuits. One per channel, yes, but it doesn't seem right.

15A-120V is only 1800 watts.

Or to look at it another way. 120V into 8 ohms = 15A
To get the 3000/6000 watts per channel of your big new amp, you would need 155V and about 20A.

Check your electrical again, that does not seem right.
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Old 20th July 2006, 07:13 PM   #25
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With a switchmode supply and enough capacity.. could you not push that much further?

Also I don't think this power rating is for sustained sine
 
Old 20th July 2006, 07:23 PM   #26
Pano is offline Pano  United States
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Quote:
Originally posted by classd4sure
Also I don't think this power rating is for sustained sine
Right, I don't see how it could be. Ohm's law says NO.

Running it off 208-200V would work. With 120V you just aren't going to get that much power, unless there is voltage doubling in the PSU. But then the 15A limit of the mains circuit becomes a problem.
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Old 20th July 2006, 07:26 PM   #27
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It's also in "VA", not watts. Fredos uses everything short of PMPO..
 
Old 20th July 2006, 11:01 PM   #28
fredos is offline fredos  Canada
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Just dont forget that only about 30% of maximum RMS rating is needed for music...At worst case 30% of 6Kw per channel is only 1800W !!! And I can told you that is not use at 100% of music capacity....maybe 60-80% of the 30% of music average...Think about this guy! I dont drive continuous sine wave in a rave (..OK not me, but some DJ for sure!), so power source is sufficient for each channel!

Fredos

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Look I start another thread for an outdoor rave installation I just finish...Start tonight and finish sunday at 12:00H!
 
Old 21st July 2006, 05:55 AM   #29
Pano is offline Pano  United States
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OK, Fredo, we understand that music is at a lower average level than a sine wave. In fact, a sine wave is -3dB from peak. The rave is probably about -10dB average. That means a lot less power, for sure.
And of course the amp's power rating is for the combined power of both channels. So the 3000W amp really does 1500W per channel. So my estimate on voltage was a bit high. You'd need about 110V for 1500W into 8 ohms. That's doable.

But it seems to me that he 15A circuits are cutting it close. That's from personal experience of years of live sound. They just don't give you much headroom. I'd want 20A circuits, if running at 120V.

But it must be working, they are blowing speakers, not amps!

So from your desciption the amps have a seperate power cord for each channel? That would certainly help current supply because each amplifier would get 30A.
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Old 21st July 2006, 06:59 AM   #30
MOER is offline MOER  United States
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Default d amp

Yes I would like to see the D amps at 97.5% efficient includung the switch mode (presume he uses these?) power supply - yeah right.

Maybe D amp should design for Crown
 

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