A New big boy amp coming to the market????

[CarAudioGuru 10+ year member]

Class H/G type amp with swinging rails. Pretty cool actually

 

[helotaxi 5,000+ posts]

I wish more companies would go the route of the G/H amps. Tons of potential there for high powered and efficient Class A/B or even Class A fidelity.

 

[mobeious 10+ year member]

ya iv talked with rick over at arc about that amp and he said it only uses as much current as needed to produce power... hardly any wasted.. some kind of on board procesesor he said u wont see that technology any time soon with another company

 

[murilo 10+ year member]

How many watts RMS "continuous" is this beast?? Not 8,000. Thats for sure. Maybe "bursts" but not continuously.
Those Switching Powers Supply cores are only good to maybe 1,000 watts each.

And there are 6? So??? The other 2 cores our output inductors for what is known as an "anti-aliasing filter".

Basically a 3 pole filter in the output stage to filter out the "hash (garbage) at slightly below switching frequencies.

Otherwise there would be just ugly white noise coming out the speaker leads.

And I counted 12 devices per side for switchers. Even if they are 70 amp continuous current (like an IRFZ48 device)

that is 840 amps of current , or about 7,000 watts.

And an even BIGGER questions is:

How do they PULL over 800 amps of current thru 1/8 thick PC board? And what gauge wire will be necessary?? Its gonna take WAY more then those "wussy" buss bars, that is for sure.

Hmmm???

And it doesn't matter what they say (or any other amp manufacturer), an 8,000 watt amplifier WILL pull 933 amps.

NO MATTER WATT!! Its Physics (not my fault)..assuming it really makes 8000 watts RMS .

Which is 89.5 volts out at the speakers (1 ohm)

Amp looks good, but will NOT be reliable. Short term, sure. Long term...not a chance in hell.

Hello Mr. Guru

The FETs used in SMPS are IRF1404, 202A each, so please re-do your calculations.

The PCB has both side +B surface, and sold mask.

 

[murilo 10+ year member]

Thanks for the impartial comments on the first posts, people, I really liked, because the products got used to be discredited on the first moment on the forums.

 

[helotaxi 5,000+ posts]

ya iv talked with rick over at arc about that amp and he said it only uses as much current as needed to produce power... hardly any wasted.. some kind of on board procesesor he said u wont see that technology any time soon with another company

There were amps in the 90s that used the same principle. The principle is that the voltage rails that the output devices modulate to create the output signal varies with the signal instead of being fixed. The difference between the fixed rail voltage and the output signal voltage is where you get your output stage losses in a Class A or A/B design. By varying the rail voltage so it is only fractionally higher than the output voltage, the losses are minimized.

 

[audioatg 10+ year member]

Thanks for the impartial comments on the first posts, people, I really liked, because the products got used to be discredited on the first moment on the forums.

Looks like ppl still are. Looking at this thread and the dbdrag forums....

 

[murilo 10+ year member]

Looks like ppl still are. Looking at this thread and the dbdrag forums....

Yes, but less than in beggining, but it is a normal human behavior, especially wen you already have your preferred brand. I did that myself wen I first meet the SounDigital amplifiers, in the very beggining.

 

[murilo 10+ year member]

Whoa! It is NOT possible that this amp swung 130 volts AC out!
Do the math, that is 130 times 130 divided by impedance (even if you use 1) that is 16.900 watts.

Smoking CRACK!!! Look at the devices. 16 FETS (bottom of picture) only 8 are on at any time,

so 8 times 70 amps (assuming IRFZ48's) and that is 560 amps of MAX current draw.

4 cores, the input connections, the "soldered" up PC traces.

16,900 watts or 13,000 watts is 1971 amps and 1516 amps respectively of full power current draw.

Reality test here folks!!!

They took 12900W out of the amplifier my friend, in 16V setup, and you shouldnt "assume" things, the FETs are IRF1404, so 8x 202 = 1616A (and the test was done in a 16V setup)

 

[sundownz Pro Seller]

Hello Mr. Guru
The FETs used in SMPS are IRF1404, 202A each, so please re-do your calculations.

The PCB has both side +B surface, and sold mask.

Just a note - in the data sheet you must see note #6

http://www.irf.com/product-info/datasheets/data/irf1404.pdf

"6 - Calculated continuous current based on maximum allowable

junction temperature. Package limitation current is 75A."

 

[murilo 10+ year member]

Just a note - in the data sheet you must see note #6
http://www.irf.com/product-info/datasheets/data/irf1404.pdf

"6 - Calculated continuous current based on maximum allowable

junction temperature. Package limitation current is 75A."

Hello Mr. Jacob, you refer to continuous current, and you know that the devide operates pulsed, few mS, please see the graphics, the limit is 4x more, about 800A. Wen I give in information 202A is just to the people who knows electronics have an idea of what the device is capable, and in this case, is a lot more than 202A.

 

[julianflor]

The maximum current allowable in the fet is 800A because the current is pulsed in SMPS mode, don´t have current DC in the power suply, then 75A don´t may be calculated here.

 

[sundownz Pro Seller]

The maximum current allowable in the fet is 800A because the current is pulsed in SMPS mode, don´t have current DC in the power suply, then 75A don´t may be calculated here.

Are you the engineer ? Your name looks familiar from other Sound Digital threads.

If so, good to have you here to explain the product design.

Is this design capable of continuous operation at the advertised power or are they designed with a music duty cycle in mind ? Eg: Only small bursts of full power output.

 

[julianflor]

Yes, I´m the PCB designer.

This design capable of continuous operation.

You don´t understand. The power suply work in SMPS, then the mosfet don´t drain current continuouly, so the maximum current are in the minimum the doble of the package limit.

best regards,

Juliano Anflor, SounDigital

 

[dB-r 10+ year member]

dB-r is supposed to be doing the warranty service on these when they become availible in the US, however, though I have spoken with Soundigital I have not requested an amp to test, have only agreed to do the repair work once they start selling in the US so I cannot add anything here about the design or the parts, or the PCB's used.

I can add however, that not everyone needs a mains power supply AC to DC to test large amplifiers, some batteries may be required, but lots of high output alternators and a built gasoline engine help generate the voltage and current necessary see image below: