Setting gain with DMM

[darkhunter139 10+ year member]

Would a 0 DB wave 60hz test tone from this site work?

http://www.realmofexcursion.com/

 

[ultimate157 5,000+ posts]

70.7v for 2500wrms @ 2 ohm.

31.6v for 250wrms @ 4 ohm.

Ah simple math hurts my brain //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[darkhunter139 10+ year member]

Ok did first test and was able to get the gain more then half way up on my 500 watt amp before I hit 31 volts

and this was with the sub settings turned to 5

If I turn my sub settings down to around 3 it goes all the way down to 20 volts. To get it back to 30 I need to move my 500 watt amps gain to around 3 quarters of the way up. Does this seem ok?

 

[ultimate157 5,000+ posts]

Perfectly normal. Lowering the sub out will lower the RCA output voltage. To compensate, the amp's gain will have to be turned up higher.

 

[aeon 10+ year member]

yes it's ok. you should have your sub setting at 0. turn your volume up about 3/4 and measure your volts.

 

[dman4486 5,000+ posts]

just remember, the point of this is to match pre-amp out on the hu to input sensitivity on the amp

 

[Decado2 10+ year member]

I am going to try it out this weekend, I hope the garage dont get too cold //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[darkhunter139 10+ year member]

I cant even reach 30 volts if I have it turned to 0 even if I turn the amp gain all the way up.

Wth is up with that? This is suppose to be a 500 watt amp.

I set my sub to 5 on the head unit and got measured 31 AC

As long as I leave my sub setting at 5 I should be good right? 31 volts is a little under 250 RMS and my sub can only handle 250

 

[darkhunter139 10+ year member]

I am going to try it out this weekend, I hope the garage dont get too cold //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

Mine was pretty cold lol

 

[luvinthebass 5,000+ posts]

0 db tones with bass is gonna be really light output use a 50 hz -6 or a 50 hz -10 if you listen to rock.

 

[dman4486 5,000+ posts]

or maybe u have the sub wired incorrectly and are not making 2ohm or 4ohm..whichever u were trying for

 

[darkhunter139 10+ year member]

0 db tones with bass is gonna be really light output use a 50 hz -6 or a 50 hz -10 if you listen to rock.

Cant I mess up my sub if I use a - tone?

Would the gains be set lower if I used a 50HZ tone? If so how do I know something like that wont come up in a song and make my amp go over 250 RMS then blow my sub?

 

[dman4486 5,000+ posts]

Cant I mess up my sub if I use a - tone?
Would the gains be set lower if I used a 50HZ tone? If so how do I know something like that wont come up in a song and make my amp go over 250 RMS then blow my sub?

u won't hurt the sub going over 250...unless u have one hela spike or clipping...

 

[darkhunter139 10+ year member]

This is what my amp can do

125 watts RMS x 2 chan. @ 4-Ohm Stereo

250 watts RMS x 2 chan. @ 2-Ohm Stereo

500 watts MAX x 1 chan. @ 4-Ohm Bridged

I have it bridge because 250 watt RMS at 2 OHM would not he enough to power a 250 watt RMS sub at 4 Ohms right?

 

[dman4486 5,000+ posts]

This is what my amp can do
125 watts RMS x 2 chan. @ 4-Ohm Stereo

250 watts RMS x 2 chan. @ 2-Ohm Stereo

500 watts MAX x 1 chan. @ 4-Ohm Bridged

I have it bridge because 250 watt RMS at 2 OHM would not he enough to power a 250 watt RMS sub at 4 Ohms right?

correct...with that hardware, you would have to run the amp bridged at 4ohm... and turn the gains down...wait...that is 500 max? or 500 rms