Hifonics BRZ2100.1D

[bl4ckw1d0w]

I am in need of a little direction here...

This amp has the 12 IRF064N's in power section and 10 IRF9640's and 10 IRF640N's in banks of 5 each side with the DWM1216 (2610) Audio driving board.

I have the amp powered on and plays audio but i believe the load its driving to the subwoofer is not up to par what it should be. Im averaging 30V A/C on the output terminals with a 2ohm load before clipping. It just seems like its really weak. I dont have anything for comparison. I have scope and am good at following directions and have the repair tutorial but I am just stumped.

 

[Perry Babin]

With your scope, look at the input and output of the rectifiers. Is the peak voltage into the rectifier essentially identical to the output of the rectifier?

Does that voltage remain relatively constant when the amp is driven hard?

 

[bl4ckw1d0w]

At D32 FMG33R and at D33 FMG33S.

Voltage going into the amplifier is 12.89V

Under heavy load the voltage is drop for my power supply is about 1 volt.

I have attached what I am seeing.

Rail voltage +-73 No Load and +- 65 under load.

 

[Perry Babin]

When the supply drops to ±65, does the amp clip very near the 65v rails?

 

[bl4ckw1d0w]

Yes +- 64.5

 

[Perry Babin]

Did you test the output with a sine wave of about 50-100Hz?

 

[bl4ckw1d0w]

Yes for a load test I used 80 Hz test tone.

 

[bl4ckw1d0w]

Did you want me to check the speaker outputs?

 

[Perry Babin]

Yes. I'd expect something close to 45v at the speaker terminals with 65v rails.

 

[bl4ckw1d0w]

Im getting 38V A/C at 50HZ, and 80hz.

39.5V A/C at 120hz

39.9 A/C at 200 hz

 

[Perry Babin]

The amp is rated at 14.4v DC. It's going to produce much less at lower voltage. It's likely OK.

 

[bl4ckw1d0w]

I just realized that i run 12v and most cars run at 13.8 or so and i didnt check the specs in the manual for the power ratings. Man do I overthink things sometimes. Thank you Perry.

 

[bl4ckw1d0w]

Just an updated. I tested this with 80hz test tone testing running at 13.8v input and the speaker terminals received 52v A/C before clipping. All is well.