First Comp

[culzero 0]

Went to a USACi comp in Marrerro, LA last night. Took 1st place with a 147.9db @38Hz Legal all sealed up on the dash. No camera with me so i'll post pics of the plaque when I get back home later tonight. I feel as if I could've gotten really close to the 150 mark but the amps kept going into protection.

I got two SAZ-3000d strapped together on (4) Phoenix Gold Ti12d Elite subs. When I put a meter on my terminals I get a DC Resistance of 1.7 ~ 2.0 ohms which doesn't make any sence because the subs are dual 4ohms. Not sure why I sometimes get a resistance less than 2ohms. Each sub is series for an 8ohm load then all paralleled to one set of terminals which should be a 2ohm load. But at the comp last night as soon as I would get to 37~38Hz the system would just stop playing. Once I turned off the amps for about 30 seconds then turn back on they went back to playing fine with no problems.

Do you think its possible that at 37Hz my impedance is dropping to low? Should I add a second set of terminals, unstrap the amps and run a 1ohm load per amp? Thanks for all the help guys.

[JimJ 11]

DCR is not nominal impedance...

If you want to know what your actual impedance is at 37Hz, you need an RMS clamp meter to measure current accurately...which with 6kW in amps I would hope you have already.

[dbjunior 0]

what does your electrical look like

[sundownz 197]

My first thing to check is voltage supply - they will protect with low voltage.

[culzero 0]

I was wondering if it went into protect with low voltage. I got a 300amp alt showing up on tuesday. So I'll hopefully find out soon if that was the problem.

[Duran 387]

I was wondering if it went into protect with low voltage. I got a 300amp alt showing up on tuesday. So I'll hopefully find out soon if that was the problem.

I can almost guarantee that's the problem. Do you seriously have those amps and not know anything about them?

[culzero 0]

I can almost guarantee that's the problem. Do you seriously have those amps and not know anything about them?

I knew they had the undervoltage protection; It's just I didn't think I was getting that low of voltage.

[rushnrun 14]

do you atleast have extra batts?

[culzero 0]

I got an optima yellowtop under the hood, (3) powermaster D3100s in the back, 1/0 power and ground from under hood to rear batteries.

Still need to do the big 3

[jonbearsmt 919]

perhaps the big three and a few more runs to the rear, have you ever DMM'ed your voltage while playing?

[loudcav 1]

with all those batteries in the rear it wont really matter how many runs of power and ground you have the amps get power from the batteries in the rear the power is just basicly a recharge wire.

[Derrick824 4]

have you ever DMM'ed your voltage while playing?

x2. With that much power you should keep a close eye on voltage drop.

[culzero 0]

well i got an Iraggi 300Amp Alternator installed yesterday. Did a quick test of the system. Idle voltage at rear batteries is now 14.2 vs 13.8. At close to full tilt and around 1200rpm the lowest voltage drop seen was 12V. Looks like I am going to replace my stock battery with a Powermaster D3100 if it will fit. And if I can find room for another one in the back I will as well.

[jonbearsmt 919]

with all those batteries in the rear it wont really matter how many runs of power and ground you have the amps get power from the batteries in the rear the power is just basicly a recharge wire.

you dont think that if he was playing hard before the run the cells might have been lower then normal and did not get the charge they were looking for in the time that he recharged,

or maybe im thinkin off.....

but you should charge faster with more runs.

[loudcav 1]

with all those batteries in the rear it wont really matter how many runs of power and ground you have the amps get power from the batteries in the rear the power is just basicly a recharge wire.

you dont think that if he was playing hard before the run the cells might have been lower then normal and did not get the charge they were looking for in the time that he recharged,

or maybe im thinkin off.....

but you should charge faster with more runs.

not really remember that his front battery gets the charge first and it equalizes out