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Old 17th January 2010, 10:32 PM   #1
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Default rockford fosgate 301s

Wondering if anyone knows what they are using for gate resistors in this amp
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Old 17th January 2010, 10:44 PM   #2
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Supply or outputs?
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Old 18th January 2010, 12:17 AM   #3
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Location: Louisiana
Power supply: 33 ohm
Audio: 10 ohm
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Old 18th January 2010, 03:32 AM   #4
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and they use 3205's for power supply fets?
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Old 18th January 2010, 03:48 AM   #5
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A 33 ohm gate resistor would work with a 3205.

Were the original PS FETs 3205s or had they been replaced previously?
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Old 18th January 2010, 03:55 AM   #6
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not sure when i opened the amp up there were 3205's in the supply but they were blown. I thought maybe they might have used irfz44's orginally but tryed the 44's for the fets and amp drew current like crazy
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Old 18th January 2010, 03:58 AM   #7
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Either the PNP driver transistors or the gate resistors are likely defective if the current draw isn't due to a fault in the audio section of the amp.

The Z44s or the 3205s should work with no problems in this amp.
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Old 18th January 2010, 04:20 AM   #8
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power supply drivers are blown. Wondering what the part numbers are for theese?
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Old 18th January 2010, 05:10 AM   #9
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2A = MMBT3906 (MMBTA56 makes a good sub if you have it)

1A = MMBT3904 (MMBTA06 makes a good sub if you have it)
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Old 6th March 2011, 02:19 AM   #10
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can anyone help me I have a rockford fosgate 301s amp and 2 audiobahn 12" subs I have not had hooked up for probably 3 years all worked fine when i took out of vehicle now trying to install in 2005 durango using factory radio purchased a line out converter when everything is wired up my light comes on on the amp but no sound out of subs wired up bridged as before putting subs in series checked resistance on both subs (4ohms each) had 8 ohms wired up just at a loss its been a while since i have played with any car audio
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