[ltr450racer690]

what do you guys use for sub out hu setting. do u go all the way open or 0?

i have a saz3500 at .5 and a crescendo 1000c4

i have a dc270 for a alt and right now the batts consist of

1 hc1800 up front
2 d3400 in the rear.

with the sub out on the hu at 6 i sit at 13.8-14.4 depending on song
with the sub out on the hu at 12 i sit at 11.4-12.1 depnding on song


this is all at idle, so what do you guys think, i think im grabbing 2 hc2000 today, will it help or is it not needed



kyle

 

[iamsonic]

I suggest starting all your head unit levels at zero dead center. neither negative nor positive.

 

[ltr450racer690]

ok. im afraid that why im getting my voltage drops are cuz at 12 im clipping them so thats why i have horrible drops in voltage. really hard to tell, cuz the box is in the house during testing cuz i can get to the batts with the box in

 

[ltr450racer690]

so whats the difference if i set gains with 0 hu out and set gains with +12 hu out??

 

[SKDooley]

If you plan to use the sub level output on the head unit, you want to set the gains on your amps with the suv level all the way up. This way you can turn your amps down, and back up, but never over driving the amps. If you set the gains with the level at 0, turning the level up increases the signal going back to your amps which in turn is going to increase your amp's output voltage. This will change the level of volume at which you reach full tilt and can cause you to over drive the amps. This will lead to clipping and excessive current pull, which is why you're getting voltage drop. I would reset your gain with the sub level maxed out, then you'll have nothing to worry about when adjusting the subwoofer level.

 

[Fatboy501]

If you plan to use the sub level output on the head unit, you want to set the gains on your amps with the suv level all the way up. This way you can turn your amps down, and back up, but never over driving the amps. If you set the gains with the level at 0, turning the level up increases the signal going back to your amps which in turn is going to increase your amp's output voltage. This will change the level of volume at which you reach full tilt and can cause you to over drive the amps. This will lead to clipping and excessive current pull, which is why you're getting voltage drop. I would reset your gain with the sub level maxed out, then you'll have nothing to worry about when adjusting the subwoofer level.

this

 

[ltr450racer690]

will do. thanks guys, going to find what my rca's voltage is in the rear with a dmm and go from there

 

[jdmferio13]

you still have the jvc kd-ar8500 right?

 

[ltr450racer690]

yep

 

[indytrucks]

What dooley said....kinda. I would not set the amps up with the sub level all the way up. I would do it at say 10/12. that way if you are playing an acoustically degraded track you can bump the sub level up slightly to account for it.

 

[ltr450racer690]

What dooley said....kinda. I would not set the amps up with the sub level all the way up. I would do it at say 10/12. that way if you are playing an acoustically degraded track you can bump the sub level up slightly to account for it.

thats a idea then....


team f von wins again lol

 

[jdmferio13]

I know voltage does differ but with that hu on 0 sub and 0 for the volume level it clips right around 27 on volume.I have that same one but gonna sell it.

 

[indytrucks]

Don't you have access to an O-scope?

 

[ltr450racer690]

I know voltage does differ but with that hu on 0 sub and 0 for the volume level it clips right around 27 on volume.I have that same one but gonna sell it.

so set all my gains at like 27 not 37 then ??

 

[ltr450racer690]

Don't you have access to an O-scope?

nope unless one of you chicago boys have one?

 

[jdmferio13]

Yeah you know you have the volume level and a sub level right.I put those at 0 and sub at 80.I love the unit I might keep it

 

[indytrucks]

"Normally" a general rule of thumb is that most head units start to send a clipped signal around at 3/4 volume. This is not always true though. For instance, higher end hu's like the 7200mkII, DCT-Z1, 880/800, etc can all be played full volume with no clipping. Its sort of a catch though because most hu's wont do the full RCA output voltage (say 4v) until you get up into that range.

 

[ltr450racer690]

yea there is 2 levels, there is a also a volume adjust in the menu. did u do the test with the internal amp on or off??

 

[indytrucks]

nope unless one of you chicago boys have one?

I'm pretty sure Pat has one. Chaos_Theory does too.

 

[jdmferio13]

You can leave sub at 0 but put volume level at max which i believe is +5 and set it there but your hu volume will decrease when clipping.