gain setting question

[itzme218 10+ year member]

Okay so I go play with my amp and different sub again. long story short. I set the Amp with a dmm at 45hz, sub is dvc4 and amp puts out 800w at 2ohms so voltage should not go over 40(after all the math is done). When it goes over 40 my amp gives a winy noise. So when setting the gains sub is not hooked up.

HU is at 40 (max i listen to) & sub control at 3, just so I can put the sub to 6(max) when vol is at like 25 during normal driving.

Okay so now I go play late nite tip. playing playing....then i slowly turn it up to 40 with sub control at 6max, and I am also checking with the dmm, its at like 25v or so. If it was at this vol and sub control at 6max playing 45hz test tone, it would be clipping. My question is does it matter if the sub is hooked up or not when using the dmm.

Either that or late night tip is playing below 30hz and my subsonic filter is filtering it out.

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[luvinthebass 5,000+ posts]

what do you mean by whiny noise? hmm maybe that's how much power your amp can only put out CLEANLY and that whiny noise is clipping, well as long as the sub can handle the test tone and how much watts your givin the sub then it shouldn't hurt it, just don't have the sub bein clipped. oh and keep the bass boost off //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[itzme218 10+ year member]

yup, that whiny noise is the amp telling me to lower the gain before it shuts off, noise = not good. and i didn't burp the sub with test tones...it wasn't hooked up when i was setting gains. but my question still didn't get answered. why can the amp only handle so much with the test tone 45hz then when the sub is hooked up and playing late nite tip the lowest and loudest music track i listen to...the amp can take more.

Either way my gains are set so that nothing stuipd happens, but i just want to know for the info

 

[phyphoestilic 5,000+ posts]

maybe late night tip is playing a different frequency that u just think is louder.

 

[itzme218 10+ year member]

well when i was testing with 40hz and 45hz and 50hz, after i set the gains on the dmm to read 39ish on 45hz, i tested with 40hz and 50hz, when I droped it down to 40hz the readings would go over 40 and the amp would whine and at 50hz the readings would be around 35ish, so I was guessing lower freq would stress the amp more.

 

[luvinthebass 5,000+ posts]

yup, that whiny noise is the amp telling me to lower the gain before it shuts off, noise = not good. and i didn't burp the sub with test tones...it wasn't hooked up when i was setting gains. but my question still didn't get answered. why can the amp only handle so much with the test tone 45hz then when the sub is hooked up and playing late nite tip the lowest and loudest music track i listen to...the amp can take more.Either way my gains are set so that nothing stuipd happens, but i just want to know for the info

cuz music is so much more transient and you amp can handle that easier then a continuous sine wave test tone at 45 hz

 

[itzme218 10+ year member]

nm, figured it out

 

[luvinthebass 5,000+ posts]

well when i was testing with 40hz and 45hz and 50hz, after i set the gains on the dmm to read 39ish on 45hz, i tested with 40hz and 50hz, when I droped it down to 40hz the readings would go over 40 and the amp would whine and at 50hz the readings would be around 35ish, so I was guessing lower freq would stress the amp more.

yup