Having problems with PG 5.0:1 amp

[Alpine2005 10+ year member]

I just bought it and having problems with the sens adjusting nob. I am powering a alpine type S SWS-1242D sub at 2ohms When I set it higher than 4 I can hear a sound like a fan from the sub. Then when i turn off the head unit a big pop sound comes from the sub and it moves with the pop. The other nobs work fine just the sen nob can not be adjusted to a higher level. I also have the 8.0:4 and the 4.0:2 and they work fine at higher than 4 sen. Its not the woofer because i tried it with many other amps that i have with the same rms and watts. I disconected the rca cables to see what it would do and it still did the fan sound from the woofer.

thanks

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[Alpine2005 10+ year member]

anyone can help me

 

[Alpine2005 10+ year member]

should i return it

 

[kwang125 10+ year member]

sensitivity knob is not volume knob. you shouldn't mess with it unless you know what you are doing. if you do know what you are doing, then, return the amp. other ppl said PG Octane amp no good.

 

[Alpine2005 10+ year member]

so whats the sensitivity knob for then?

 

[Alpine2005 10+ year member]

i just connected my amp to my bros sub and it also making the sound.

my bro has a 5.0:4 amp and 2 pioneer ts-304c subs and his sen nob does not make the fan sound.

so i'm going to return it on monday.

 

[JimJ 5,000+ posts]

have you set your gains according to JL's tutorial and the sticky posted on this forum? If not, that's the first thing you should do.