Amplifier efficiency and electrical

[atoz2]

I'm looking to run 1500-2000w, with 2 group 65 agm's and big 3 done. Is that enough to successfully run 1500-2000w my stock alternator is a 90 amp. So looking at amplifier efficiency, I've head good things about b2 mono and incriminator 20.1 being ran on stock electrical. Any other suggestions guys? Also if you conservatively set gain on an amplifier does it change the efficiency? Like if I run my Vfl 175.1 with the gains set around 2000w? I know efficiency drops with lower resistance.

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[los33 10+ year member]

I'm looking to run 1500-2000w, with 2 group 65 agm's and big 3 done. Is that enough to successfully run 1500-2000w my stock alternator is a 90 amp. So looking at amplifier efficiency, I've head good things about b2 mono and incriminator 20.1 being ran on stock electrical. Any other suggestions guys? Also if you conservatively set gain on an amplifier does it change the efficiency? Like if I run my Vfl 175.1 with the gains set around 2000w? I know efficiency drops with lower resistance.

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It may or may not work depending on subs, box rise, impedance, car electrical.

Efficiency also changes from subs, box rise, power, wires, fuses, voltage.

No one can answer if this will work as it should or not, Best way to go at it is get a volt meter and watch your voltage. If voltage starts to drop 12v or below then lower the gain on the amp.

 

[n2audio 5,000+ posts]

Will it work? Yes.

The real question is how long will it work. And that's the one nobody can answer.

Efficiency should remain generally the same regardless of the gain setting.

I've never seen a plot on efficiency at various levels of output at the same impedance.

Only full power at different impedance.

Obviously, the lower the gain is set the less power the amp will produce, so that will always benefit your electrical system.

Regardless, unless you're running the amp at very reduced output 2k's going to put a beating on a 90A alt.

If you play it at half volume all the time it might last a while, but if you like an occasional blast session it wouldn't be reasonable to expect more than a few months out of that alt.

It'll just run SO hot all the time -- and that is how an alt gets damaged.

Of course there are cases that for whatever reason it works for a year or so, but to expect that isn't realistic.

My last car had a 130A alt that burned up 2 times in

Big batteries don't do much until the alt is maxed out.

 

[atoz2]

Will it work? Yes.The real question is how long will it work. And that's the one nobody can answer.

Efficiency should remain generally the same regardless of the gain setting.

I've never seen a plot on efficiency at various levels of output at the same impedance.

Only full power at different impedance.

Obviously, the lower the gain is set the less power the amp will produce, so that will always benefit your electrical system.

Regardless, unless you're running the amp at very reduced output 2k's going to put a beating on a 90A alt.

If you play it at half volume all the time it might last a while, but if you like an occasional blast session it wouldn't be reasonable to expect more than a few months out of that alt.

It'll just run SO hot all the time -- and that is how an alt gets damaged.

Of course there are cases that for whatever reason it works for a year or so, but to expect that isn't realistic.

My last car had a 130A alt that burned up 2 times in

Big batteries don't do much until the alt is maxed out.

Got it h/o alt ordered

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[keep_hope_alive Premium Member]

The reason efficiency drops at lower resistance/impedance loads is because output current increases which means more heat due to resistance and thus more losses

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