Crazy Idea Sanyo PA6100 AMP

[Brain Fried]

Ok i am doing a old school setup with two sanyo PA6100 amp's and i want to mono them but you can't with out some mod's to the pre amp. So here my idea. am i on the right track?

[Brain Fried]

[Perry Babin]

Why do you want to bridge it? If I remember correctly, these amps can't drive anything lower than 4 ohms. Bridged, that would be 8 ohms minimum.

[Brain Fried]

Originally Posted by Perry Babin

Why do you want to bridge it? If I remember correctly, these amps can't drive anything lower than 4 ohms. Bridged, that would be 8 ohms minimum.

I have ran them at 2ohm stereo with no problems in the past.

[Perry Babin]

Were they rated to go to 2 ohms per channel?

[Brain Fried]

Originally Posted by Perry Babin

Were they rated to go to 2 ohms per channel?

No but we did it anyways back in the late 80's & early 90's they ran a little hot but did not thermal the amp.

[Perry Babin]

They're unlikely to survive and if they use the large output modules, they may not be repairable.

The circuit has a number of problems. Where did you get it from? If you go back and number each component (R1, R2, C1, C2...), I'll try to help with it.

What is the purpose for the circuit other than inverting one channel?

Where are you getting the ±18v?

[Brain Fried]

Originally Posted by Perry Babin

They're unlikely to survive and if they use the large output modules, they may not be repairable.

The circuit has a number of problems. Where did you get it from? If you go back and number each component (R1, R2, C1, C2...), I'll try to help with it.

What is the purpose for the circuit other than inverting one channel?

Where are you getting the ±18v?

i copied it from a powered sub woofer that i have but i don't need to go that route i went Navone Engineering and they had a in line transformer that did the same thing. So i mono ed my first sanyo pa6100 today. I tested with a 15in 4ohm woofer for a hour at 3/4 volume with no problems.

[1moreamp]

You could have used one of these also, it has a normal and a 180 out of phase single output thus earning the name sub-woofer crossover/ bridging adapter:

Audio Control 2XS 2-way "Old School" Crossover 90Hz | eBay



Those old Sanyo amps were monsters but they use power amp chips like used in home stereo gear back in the 70's and 80's and they have internal emitter resistors that like to go out of spec when exposed to high current conditions. They are internal to the big chip so they will be unserviceable and the whole chip will require replacement. I think this is what Perry was thinking of concerning the application of running low ohm loads. Had a few of the old Sanyo amps myself...

[Brain Fried]

Originally Posted by 1moreamp

You could have used one of these also, it has a normal and a 180 out of phase single output thus earning the name sub-woofer crossover/ bridging adapter:

Audio Control 2XS 2-way "Old School" Crossover 90Hz | eBay



Those old Sanyo amps were monsters but they use power amp chips like used in home stereo gear back in the 70's and 80's and they have internal emitter resistors that like to go out of spec when exposed to high current conditions. They are internal to the big chip so they will be unserviceable and the whole chip will require replacement. I think this is what Perry was thinking of concerning the application of running low ohm loads. Had a few of the old Sanyo amps myself...

The old sanyo Pa amp's were bullet proof to a point they could take a beating at low ohms. The main failure in the sanyo was the power supply and that usually easy fix. I have only seen one STK Power pack failure and that was do to a dead short at high volume on one woofer.What killed sanyo is they did not make a amp above 100watts people want more power why have a 100watt when you could have a 1000watt amp.