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Old 07-11-2006   #1 (permalink)
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Default Amplifier Output Voltage Calculator


Here's calculator that will determine the required output voltage of your amp when setting the gains.

http://www.caraudio911.com/tutorials...et/voltage.htm
The above link is bad. Use the posts in this thread to set your gains. All the information you need has been posted below.
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Last edited by johnecon2001; 09-20-2008 at 02:46 PM.
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Old 07-11-2006   #2 (permalink)
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mines is 44.7 but what do you do with it sorry have a lot of power but still learning
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Old 07-11-2006   #3 (permalink)
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ya I got 46.9v 1100@2ohm

No idea what that means.. Unless it counts toward how much voltage I would need to keep running into the amp at a constant.. so.. 47v basically.. I think
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Old 07-11-2006   #4 (permalink)
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mines is 44.7 but what do you do with it sorry have a lot of power but still learning

disconnect your speakers, connect a dmm to the amps out outs. Set it to AC. Set your HU to 3/4 volume. Play a 60 hz tone. adjust your gain until the dmm reads 44.7 volts. Now hook your speakers up, and your good to go.
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Old 07-11-2006   #5 (permalink)
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Originally Posted by COLOSSUS
ya I got 46.9v 1100@2ohm

No idea what that means.. Unless it counts toward how much voltage I would need to keep running into the amp at a constant.. so.. 47v basically.. I think
Hey is that a BXi1606 you got? Lol thats the same voltage I get. This number tells you the maximum voltage your amp will put out before clipping. so if your setting your gains and the dmm goes above 46.9 volts its clipping.
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Old 07-11-2006   #6 (permalink)
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oh sweet. And nah, Don't have an amp but i'll be going for 1100@2ohm so I guess I will be getting a 1606 lol

Unless... actually, what are the ohms for an 8-ohm sub? SVC
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Old 07-11-2006   #7 (permalink)
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its one sweet amp

One 8 ohm svc sub would be 8 ohms
one 8 ohm dvc wout be 4
so to get to 2 ohms you need two dvc 8 ohm subs
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Old 07-11-2006   #8 (permalink)
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Quote:
Originally Posted by Fallen
Hey is that a BXi1606 you got? Lol thats the same voltage I get. This number tells you the maximum voltage your amp will put out before clipping. so if your setting your gains and the dmm goes above 46.9 volts its clipping.
where do you get the dmm from
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Old 07-11-2006   #9 (permalink)
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Radioshack or any other good electronics store has them.. hell.. Wal-Mart might have them too lol

And DMM Means Digital Multi-Meter.. if you didn't know.. Cuz.. Shances are if you ask for a DMM they might not know what you're talking about.
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Old 07-11-2006   #10 (permalink)
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Heh mines from walmart, it was like 10 bucks.
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Old 07-11-2006   #11 (permalink)
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Quote:
Originally Posted by jmays
mines is 44.7 but what do you do with it sorry have a lot of power but still learning
this is the output voltage you will set your amp to when setting the gains with a dmm.
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Old 07-11-2006   #12 (permalink)
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Thanks for the calculator Shon
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Old 07-11-2006   #13 (permalink)
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my only question on the calculator is how do they know the internal resistance of your meter?

I have a few meters that have a resistance of 1.4 ohms and others that are .5 ohms. that would make a big difference on the output voltage.
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Old 07-12-2006   #14 (permalink)
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Wouldnt your meter take that into account when determining the voltage?
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Old 07-12-2006   #15 (permalink)
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Good Point.
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Old 07-12-2006   #16 (permalink)
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Quote:
Originally Posted by mikefallon
my only question on the calculator is how do they know the internal resistance of your meter?

I have a few meters that have a resistance of 1.4 ohms and others that are .5 ohms. that would make a big difference on the output voltage.
it does not condiser internal resistance. it's a theory based calculation based on ohm's law. a perfect dmm would have an infinite resistance. however, if it did, that means it would not be able to measure voltage since resistance is required to take a reading. most modern dmm have a resitance in the megaohms per volt. by having a high resistance this high, you a less likely to alter the readings of from a circuit because the resistance from the circuit is much lower.
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Old 07-12-2006   #17 (permalink)
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I got 80v on 3200@ 2 ohm.. lol God dayum...
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Old 07-12-2006   #18 (permalink)
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Quote:
Originally Posted by Fallen
Quote:
mines is 44.7 but what do you do with it sorry have a lot of power but still learning

disconnect your speakers, connect a dmm to the amps out outs. Set it to AC. Set your HU to 3/4 volume. Play a 60 hz tone. adjust your gain until the dmm reads 44.7 volts. Now hook your speakers up, and your good to go.
i thought it was suppose to be a 50 hz tone????? thats what jl's tutorial and jmac say over on ca.com
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Old 07-12-2006   #19 (permalink)
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sweet calc shon!!!! Man..if only you had this when i had my thread on this...maybe there wouldnt be 4 (or was it more?) pages on me trying to figure out what ur talkin about LOL!!

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Old 07-13-2006   #20 (permalink)
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i thought it was suppose to be a 50 hz tone????? thats what jl's tutorial and jmac say over on ca.com
It doesnt matter too much if its 60 or 50. Since the AC in north america is 60, the dmms here should be pretty accurate at that frequency. In europe its 50 hz, but either way the dmm should be able to read it. Using a 5 hz sine wave wouldnt work, it would show a varying voltage.
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Old 07-13-2006   #21 (permalink)
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Thanks for the calculator. I have a power acoustik A3000DB and heres the results I got...

2300W rms @ 1 ohm = 48 V
1800W rms @ 2 ohm = 60 V
1100W rms @ 4 ohm = 66.3 V

So the max output voltage before clipping varies quite a bit depending on the impedance of the load. Now since I have two of these amps. I have two dual 2-ohm 15's that I want to run at 1 ohm each. Should I chain both amps together (master/slave) so I can just use one bass knob? If I do, how does this effect the output? Will it just act like one big 2 channel amp w/ 2300W @ 1ohm x2?
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Old 07-16-2006   #22 (permalink)
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I just did this on my Bx-1500D. It is VERY easy to do, and it actually suprised me at the differance it made.

With everything turned all the way down, subwoofers disconnected, no equalizer, subwoofer volume on the headunit at 1 (0 turns the subwoofers off). I hooked up the DMM leads just like I would do the sub wires.

My headunit maxes out at volume 50. I am thinking that 36 is right around 3/4 of full volume (probably 38 though). Volume 36 will do fine as I have never turned the headunit up that far since I've owned it (with amps and speakers connected to it).

Turned on the system. Voltage output at amp is 0.00. Started turned up the gain and got 13, 20, 23, 25, 30, 35, 40, 42, 45. It jumped right over 44 volts. I turned it back down to 42 and started messing with the lowpass crossover (fileter, or whatever it's called..hehe). I got 42.5, 42.6, 42.7, 43, 43.5, 43.7, 44, 45.

When I hit 45, I backed it down to where it was at 44. then I started with the bass EQ (on the amplifier, it's actually like bass boost). I got 44, 44.1, 44.2, 44.3, 44.4, 44.5, 44.6, 45. Once again it jumped over what I needed.

After all this, the best I could do is 44.6 volts. I needed 44.7. I don't think a tenth of a volt is going to cause me any heartaches.

Is it loud? Oh yea, loud for the Dubs. Nice and clean sounding. Not bottoming out. Real nice...

And the best part of it is.... I did not get one complaint during the tuning. This is a much quieter way of doing it and is very, very, easy.

The ear method just doesn't compare to the DMM method.
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Old 08-03-2006   #23 (permalink)
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This is probably a noob question but clipping will blow your subs correct? Also for this calculator to work correctly do I put in rated power or get it benchtested first?
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Old 08-03-2006   #24 (permalink)
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you put in rated power unless you have a real sh!tty amp that produces nowhere near rated power. And Yes, clipping kills subwoofers.
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Old 08-03-2006   #25 (permalink)
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calculator dont mean **** sorry...ive tested a pa 3000 at .67 REACTIVE and it only did 1600 watts..real watts
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