LMAo how do i tune my amp

[Team MAF 10+ year member]

I got a descent amp here im not about to go...TUNE BY EAR....3/4ths volume and turn the gain till it sounds good..I want specific voltage numbers. dont need to blow an amp and or subs by "PLAYIN BY EAR"

The voltage calc is off on ROE..so whats the formula.

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[CadillacMatt 10+ year member]

sqrt(PxR)

P being the voltage you calculated and R being the resistance of the total load

 

[Team MAF 10+ year member]

but i have a amp that is underrated..Ia20.1 to be exact

what do i tune for?

 

[DejaWiz 5,000+ posts]

but i have a amp that is underrated..Ia20.1 to be exactwhat do i tune for?

Doesn't matter if the amp is underrated or not.... the output voltage won't change.

SQRT(Watts * Ohms).

For example, let's assume your amp will do 1150W RMS at 2 Ohms vs it's rated 900W RMS @ 2 Ohms.

You want to send 700W RMS to a D4 sub wired for 2 Ohms.

SQRT(700 * 2) = 37.42 Volts

You'll want to set the gains until your DMM reads 37.42 on the amp's output. The fact that your amp is underrated means nothing in this example.

 

[Team MAF 10+ year member]

lmfao i dont get it....

So the specs say 1800w at 1ohm..but obv we all kno itll do more. So wtf do i set it for?

Im running 1 ohm load

Help me out here...

 

[DejaWiz 5,000+ posts]

lmfao i dont get it....

So the specs say 1800w at 1ohm..but obv we all kno itll do more. So wtf do i set it for?

Im running 1 ohm load

Help me out here...

Regardless if your amp does 1800W RMS or 6000W RMS at 1 ohm doesn't change the result of the calculation.

If you want to send 1500W RMS to your sub(s), use the formula.

The result will be:

SQRT(1500 Watts * 1 Ohms) = 38.73 Volts

....as measured on your DMM from the amp's speaker output terminals.

 

[SRim23 5,000+ posts]

Regardless if your amp does 1800W RMS or 6000W RMS at 1 ohm doesn't change the result of the calculation.
If you want to send 1500W RMS to your sub(s), use the formula.

The result will be:

SQRT(1500 Watts * 1 Ohms) = 38.73 Volts

....as measured on your DMM from the amp's speaker output terminals.

so say you know for a fact an amp is underrated, and you wanna take advantage of that so you use the wattage you think the amp can put out.

how do you know you are getting that power? will your DMM not get up to that voltage.

like im about to get a pdx 1.1000. i know its rated 1000rms, but the birthsheet says 1200..... so i do my calculations using 1200rms instead of 1000. so assuming SQRT (1200*4) = 69.28, will my DMM not get up to 69.28 if the amp isnt capable of it? and if i get up to 69.28 am i sure im not clipping the signal?

thats a question ive been wondering and what i think the OP is trying to say.

 

[DejaWiz 5,000+ posts]

so say you know for a fact an amp is underrated, and you wanna take advantage of that so you use the wattage you think the amp can put out.
how do you know you are getting that power? will your DMM not get up to that voltage.

like im about to get a pdx 1.1000. i know its rated 1000rms, but the birthsheet says 1200..... so i do my calculations using 1200rms instead of 1000. so assuming SQRT (1200*4) = 69.28, will my DMM not get up to 69.28 if the amp isnt capable of it? and if i get up to 69.28 am i sure im not clipping the signal?

thats a question ive been wondering and what i think the OP is trying to say.

If the amp is not capable of 1200W RMS, then no, the output voltage will not get to 69.28 Volts.

If the amp is capable of it, then it will.

As for clipping at a wattage higher than what's rated (if the amp is underrated and the birthsheet shows this), that's where you have to know how the amp was tested to get the 1200W RMS (Vs. the rated 1000W RMS). Alpine is generally very good about providing this information on the birthsheet... say, they were able to measure 1200W RMS at 4 Ohms at

To tune the gain effectively, you have to know the point on the HU's volume dial that will result in a distorted signal, as well as be able to monitor the amp's output signal on an oscilloscope in order to be absolutely sure that the output signal isn't clipped. This would be done when a test tone is being played and there are no speakers attached to the amp's output terminals.

Alternately, a keen set of ears would be able to distinguish between a clipped and non-clipped output from the speaker when being driven by the amp.

 

[khanhfat 10+ year member]

I got a descent amp here im not about to go...TUNE BY EAR....3/4ths volume and turn the gain till it sounds good..I want specific voltage numbers. dont need to blow an amp and or subs by "PLAYIN BY EAR"
The voltage calc is off on ROE..so whats the formula.

IF you got a decent amp , why would it blow? You haven't stated what your equipment is so no body can say anything about it.

Tuning by ear is far best cause it's all aboout your tastes and your perception about how you want your music sound like.

If you tune to the level that the speakers starts to clips or distort, you know you've reach maximum limit and just simply turn it back down.

As far as Xover goes, 80hz HP is good start point, some speakers won't be able to play at 80hz clearly so u have to cross higher to get the best out of it. As far as sub goes, start from 80hz -100hz some likes it lower than 80hz but it's still depends on how good your midbass can play. I'd rather set at 100hz just to be sure hahaha.