Have had a few people ask for a comparison and I happened to get one in for trade -- so here it is.

Not sure if this is factory or from the repair but the AQ also uses Fairchild output parts vs. IRF parts:

* SAZ-3500D is a bit longer and wider

* SAZ-3500D has 20 caps in PS section vs. 16 in the AQ

* Another view of the power supplies in comparison

* Output sections : Output inductors are equal, SAZ-3500D uses 16 outputs vs. 12 in the AQ

* SAZ-3500D Transformers compared to a dollar bill

* AQ-3500D Transformers compared to a dollar bill

Before anyone starts a fight... I am just offering a comparison of parts counts, sizes, etc. I am not saying anything bad about the AQ product.

Power Test Completed.

I know someone will ask these questions SO READ THIS FIRST :

1) AQ-3500D Tested First - Battery Bank had a charge for several hours from our bench power supplies

2) SAZ-3500D Tested Second - Only a few minutes behind the AQ-3500D Test

3) THIS IS WHY the 3500D had much more voltage drop, I had the entire surface charge gone from the batteries

4) Both amps set wide open to be apples to apples.

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AQ-3500D POWER TEST:

http://www.sundownaudio.com/misc/_AMP_POWER/AQ3500D_SAZ-3500D/CIMG2679.MOV

AQ-3500D VOLTAGE TEST:

http://www.sundownaudio.com/misc/_AMP_POWER/AQ3500D_SAZ-3500D/CIMG2681.MOV

POWER : 2400 Watts

AMP VOLTAGE (measured) : 71 V

AMP CURRENT (calculated) : 33.8 A

ACTUAL IMPEDANCE (calculated) : 2.1 ohms

SUPPLY VOLTAGE : 14.22 V

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SAZ-3500D POWER TEST:

http://www.sundownaudio.com/misc/_AMP_POWER/AQ3500D_SAZ-3500D/CIMG2682.MOV

SAZ-3500D VOLTAGE TEST:

http://www.sundownaudio.com/misc/_AMP_POWER/AQ3500D_SAZ-3500D/CIMG2684.MOV

POWER : 3020 Watts

AMP VOLTAGE (measured) : 77.2 V

AMP CURRENT (calculated) : 39.11 A

ACTUAL IMPEDANCE (calculated) : 1.97 ohms

SUPPLY VOLTAGE : 11.99 V

The power difference measured correlates very well with the parts count difference in the output section.

I have all of the subs out of my Jeep or I'd try them both at 1/2 ohm.