Rockford Fosgate Power 1100a2

seankane · 29th May 2011, 03:21 AM

Hello everyone.

I have a Power 1100a2 for repair. This amp was a mess. Complete power supply rebuild, all is well with that. One channel was completely fried. Rebuilt channel completely and everything is working great, amp sounds good and has clean signal on outputs.

My question?????

I remember Perry saying in a post that parallel outputs must match. So this means you could use 2 different brands in the same channel but the opposite channel has to have the same brand you put in the repaired channel?

Is this because of bridging? I used IRF640 by "IR" and the only IRF9640 I had were fairchild fets. Does this mean I have to put the same fairchild IRF9640's in the opposite channel?

Perry Babin · 29th May 2011, 11:26 AM

They don't have to match unless they're parallel. The ones in the two channels don't have to match each other.

seankane · 06:38 PM

So I used 5 IRF640 by "IR" and 5 IRF9640 by "fairchild" in the repaired channel. So the amp is clean and working great. I am ok to leave the other channel alone and everything should be fine?

Do I have to use fairchild IRF640's in the repaired channel to match the fairchild IRF9640's, or is everything ok how I have it?

Perry Babin · 29th May 2011, 08:02 PM

Leave the other channel as it is.

The 640s and the 9640s are not in parallel.

seankane · 30th May 2011, 01:38 PM

Gotcha now I understand, thanks Perry.

29th May 2011, 03:21 AM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Rockford Fosgate Power 1100a2 Hello everyone. I have a Power 1100a2 for repair. This amp was a mess. Complete power supply rebuild, all is well with that. One channel was completely fried. Rebuilt channel completely and everything is working great, amp sounds good and has clean signal on outputs. My question????? I remember Perry saying in a post that parallel outputs must match. So this means you could use 2 different brands in the same channel but the opposite channel has to have the same brand you put in the repaired channel? Is this because of bridging? I used IRF640 by "IR" and the only IRF9640 I had were fairchild fets. Does this mean I have to put the same fairchild IRF9640's in the opposite channel? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

29th May 2011, 11:26 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	They don't have to match unless they're parallel. The ones in the two channels don't have to match each other. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th May 2011, 06:36 PM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	So I used 5 IRF640 by "IR" and 5 IRF9640 by "fairchild" in the repaired channel. So the amp is clean and working great. I am ok to leave the other channel alone and everything should be fine? Do I have to use fairchild IRF640's in the repaired channel to match the fairchild IRF9640's, or is everything ok how I have it? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch Last edited by seankane; 29th May 2011 at 06:38 PM.

29th May 2011, 08:02 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Leave the other channel as it is. The 640s and the 9640s are not in parallel. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

30th May 2011, 01:38 PM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Gotcha now I understand, thanks Perry. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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