Batt V drop when subs hit - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 01-28-2013, 12:07 PM Thread Starter
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Batt V drop when subs hit

For people with subs .....does your battery voltage drop when your subs hit? I have a 500watt mono feeding four 8's. And a 300watt 4channel powering the door speakers and tweeters. Im sure its normal just want to confirm. Hope these batteries aren't already getting tired. Thanks

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post #2 of 17 Old 01-28-2013, 12:11 PM
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Batt V drop when subs hit

You need a capacitor man


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post #3 of 17 Old 01-28-2013, 12:15 PM Thread Starter
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Re: Batt V drop when subs hit

With two batteries? Really!? My trusted audio guy didnt even recommend one.

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post #4 of 17 Old 01-28-2013, 02:51 PM
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Yes a capacitor would help.

Was this at idle? Your alternator can only charge so much at idle compared to running speed(1500-2500). Take. a look at dcpower alternators if so

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post #5 of 17 Old 01-28-2013, 03:40 PM
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I have 16 speakers and 3 amps in my boat. If we crank up the sub and hits hard frequently it certainly sucks the power. I only have 2 batteries (heavy high amp hour deep-cycle and no caps), but have used large caps in previous applications. They work, but the warnings are real, use large wires, make sure they are protected, and never handle wiring or the caps unless you know they are discharged.

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post #6 of 17 Old 01-28-2013, 04:20 PM
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I have a 500w mono amp powering 2 10" subs and I don't see any noticeable drop in voltage.

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post #7 of 17 Old 01-28-2013, 04:32 PM
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Ok...
When you're playing loud and drawing a large hit on the sub - you're amp is pulling more voltage than can be supplied/sustained. Hence while I agree you should get a Capacitor as well.
Because then you're going to be pulling for the stored energy in the cap first (which will recover also a little quicker) then straight off the battery.

It helps to sustain the voltage sure,,, but for hard hammering - you'll want a cap.



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post #8 of 17 Old 01-28-2013, 04:37 PM
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You really have to have it cranked. You probably couldn't sit in the vehicle if it was hitting hard enough to pull that kind of power. But every once in a while someone drives by with bone shattering base blasting, way over powered and occasionally clipping. The 10" Kickers don't seem to suck the power, like some other subs, but SPL and over-driving amps can cause a brown-out. I have Kickers in my boat and they work just fine. Of course we are old and never play are tunes too loud when surfing.

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post #9 of 17 Old 01-28-2013, 04:42 PM
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Quote:
Originally Posted by twoicebergs View Post
You really have to have it cranked. You probably couldn't sit in the vehicle if it was hitting hard enough to pull that kind of power. But every once in a while someone drives by with bone shattering base blasting, way over powered and occasionally clipping. The 10" Kickers don't seem to suck the power, like some other subs, but SPL and over-driving amps can cause a brown-out. I have Kickers in my boat and they work just fine. Of course we are old and never play are tunes too loud when surfing.
Keep in mind - not all equipment is equal and efficient on power draw.
I seen little jensen, pyramid amps cause voltage drops powering subs,
while same watt amp from alpine, sony etc does not.
There at least 4 to 5 different reasons why voltage drops can occur feeding an amp.
But rule 1 - you have to have a contant/stable feed of power.



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post #10 of 17 Old 01-28-2013, 04:47 PM
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Quote:
Originally Posted by twoicebergs View Post
I have 16 speakers and 3 amps in my boat. If we crank up the sub and hits hard frequently it certainly sucks the power. I only have 2 batteries (heavy high amp hour deep-cycle and no caps), but have used large caps in previous applications. They work, but the warnings are real, use large wires, make sure they are protected, and never handle wiring or the caps unless you know they are discharged.
Also - Deep cycle batteries are what is helping you there.
they are intended for high power draw.
This is why people used them for Stereo, Winches, etc.
They're designed to provide high flow of power on demand to the point of being drained - then charged back up.



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