Enclosure affecting Voltage?

[mxman38]

so i had bcpballer design me a new enclosure and for the first time ever i used aero ports (im extremely pleased). Its a little smaller than my previous box, and tuned at 33hz... 5hz lower than my other box.

Im running 2 15" LVL4's and about 2500wrms to the pair

I only have a kinetic hc2000 in the rear, and stock batt up front/stock alt. big 3 yada yada

Onto the question.... I never would dip past 12.4 with my previous set up even at idle, but just cruising down the street i hit freakin 9 volts, and my amp shut off. It seems only on real low notes it drops bad, and i obviously dont want to ruin my amps.

Why is it dropping so much lower because of a new box

and what should be sufficient enough for rougly 3000wrms with the highs and sub amps.

I was thinking either replace the stock battery with a kinetic or D31, or do a 250 or so H/O alt.... Really dont have the money to do both.

Thanks for the time guys.

[bassl0va]

The box will affect the ohm load of the sub that the amp sees. I can't see how just a box can do that though, you sure you didn't change anything else?

[Andrew2944r]

More than likely the box is super efficient keeping the amp load low. If I personally was pushing anything over 2k watts I would look into a HO Alt as a battery would just be a band-aid for the problem especially for a daily driver.

[mxman38]

yeah thats the only thing i can think of, i mean, its way more brutal than my other box. I honestly am almost positive i went from the 46's to upper 49's. The woofers barely move but my voltage just drops so stupidly low.

Both subs are at .7 ohms... suppose to be 1 but i dont think that makes a difference?

what size alt should i go with, like i said all i have is an HC2000 in the rear, stock everything. 0 gauge with big three

[OldsBoomer]

first the stock battery has to go. Those batteries do NOT like to be drained that lower and come back up generally they dont come back get an AGM battery up front(the bigger the better). Then check ALL of your grounds, make sure they have good contact and aren't loose at all. You should never drop that low. if you see 11 volts turn it down

[Freshman6969]

hows your big 3 done? i had this same problem, but i switched around the big 3 and it was fine

[kirill007]

The impedance graph is totally different.

On the previous box u had more boxx rise then this one, so more power and more current draw=more voltage drop.

[OldsBoomer]

The impedance graph is totally different.

On the previous box u had more boxx rise then this one, so more power and more current draw=more voltage drop.

haha box rise effects the ohms not the current the amp will still try to put out the max power it can at that ohm load that its seeing from where the gain is set

[hdorre]

The impedance graph is totally different.

On the previous box u had more boxx rise then this one, so more power and more current draw=more voltage drop.

Sorry to thread jack, but what program do you use? Mac or Windows?

[mxman38]

first the stock battery has to go. Those batteries do NOT like to be drained that lower and come back up generally they dont come back get an AGM battery up front(the bigger the better). Then check ALL of your grounds, make sure they have good contact and aren't loose at all. You should never drop that low. if you see 11 volts turn it down

true, i will replace the front battery since its stock and 4 years old.

However, as soon as i see 10.X or my amp goes into protect, it shoots right back into the upper 13's without hesitation.

Will this alternator work? Ive heard horror stories with DC alts and trailblazer SS's

http://powerbastards.com/products.asp?cat=142988&navsid1=20&navsid2=99

hows your big 3 done? i had this same problem, but i switched around the big 3 and it was fine

Honestly i just have the Power wire to alt upgraded and battery to ground in 0gauge, rest is stock, i never finished to do the battery to chassis

Also, i have the gain all the way down... like, cant go any farther, lol

Edited September 21, 2010 by mxman38