Orion 12500.1DSSPLX

[caraudioguy2100]

All of the transformers have lose windings on them and you can hear the High pitch squealing very loudly and can also hear it through the subs .

I know it’s not recommended to put silicone or epoxy on them is there another way of curing this problem ?

 

[Perry Babin]

Are you sure that the output stage is oscillating at the right frequency?

 

[caraudioguy2100]

How do I check to see if the output stage is oscillating at the right frequency?

 

[caraudioguy2100]

I have a multimeter that will test frequency but how do I perform
The test

 

[Perry Babin]

Post a photo of the inside of the amp.

The input (FET side) of the output filter inductor would be a good test point.

 

[caraudioguy2100]

so just power ,ground,remote hooked up place red probe on output filter inductor (fet side ) and black probe on amps ground terminal and see what the frequency is ?

Here’s some pics of the inside of the amp .

 

[Perry Babin]

That's all you should need to do.

That's a grown up power acoustik amp. The BAMF5500 amps use the same driver boards.

 

[caraudioguy2100]

I get 64 kHz

 

[Perry Babin]

That's lower than I'd expect but not so low as I'd expect it to cause a problem.

Is the noise in the woofer the same as that that the transformers make?

By touching the windings, does that stop the noise?

What's the frequency of the PS?

 

[caraudioguy2100]

Power supply is the same I touched the gate leg of the fet and then one winding of the transformer and it measures 64 kHz


The winning in the sub is the same whining as the transformers are making .

If I twist them a certain way and touch them with my finger the noise stops

So wondering what I can do to fix this issue since when the noise stops you can’t hear it thru the sub either

 

[Perry Babin]

I looked up some notes for the bamf amp and the frequency was 66k so that's not as far off as I though. For the power supply, that would be very high. Probe the gate leg or gate resistor to see if you get something closer to 25 or 30kHz.

In some instances, you can simply pull the loose windings over the top of other windings to quiet them. If, as a last resort, you have to apply some sort of fixative to them, only apply small amounts where absolutely necessary... as a last resort.

 

[caraudioguy2100]

I proved the gate leg of the power supply get and 33 kHz

 

[Perry Babin]

Now I wonder how reliable the meter was on the audio reading.

Try moving the windings to see if you can quiet them.

 

[caraudioguy2100]

I tested the frequency of the audio reading again and is still 64 kHz

Retested the power supply 3 times and it is at 34 kHz

I moved the windings and the noise went away but if I bump the amp at all the noise returns .

I will have to adjust the windings to see if I can get the noise to go away completely even when bumping the amp

 

[caraudioguy2100]

Back to this amp . I got the transformers to stop making noise .

When it is hooked up in a vehicle you can hear static thru the subs and it back feeds into the mids and highs amp and you can hear the same hiss they the door speakers .


Any ideas where to start looking

 

[Perry Babin]

Is there any DC voltage on the RCA shields?

What's the resistance between the primary ground and the RCA shields?

Both without anything being plugged into the RCA jacks.

 

[caraudioguy2100]

Resistance from rca shields to ground terminal of amp :22ohms

Using the amps ground terminal as reference the is no dc voltage on the rca shields

I noticed when it powers up there is about 1 volt of dc on the rca shields but goes away when the relay clicks on

 

[Perry Babin]

22 ohms is extremely low. For similar amps (power acoustik and PPI), there is a 1k resistor between the primary and secondary grounds.

Are the RCA shields directly connected to the secondary ground?

 

[caraudioguy2100]

The rca shields are directly connected to the secondary ground I get 0.01 ohms from rca shields to secondary ground

 

[Perry Babin]

22 ohms is causing a ground loop. See if there is a resistor/capacitor/diode in-between the primary and secondary grounds.