Setting gains volt-ohm meter like in the JL tutorial...other brands???

 

Anonymous
 
ok...i see in the tutorial on JL.com that you can set gains on JL amps by using a volt-ohm meter, but what about w/ other brands???

i wanna use my volt-ohm meter to set gains on my JBL BP600.1, so what would the output voltage be at 1ohm?

is there a formula to find an amps unclipped output voltage???
 

Bronze Member
Username: Fishy

Tamarac, FL USA

Post Number: 40
Registered: Sep-04
yep

P = V^2/Z => V = (PZ)^1/2
i.e.
Voltage = the squareroot of Power x Impedance

So 1) Figure out what impedance your gonna be running ur amp at.
2) Multiply that by what the rated power is at that load.
3) Take the squareroot of that figure and that should give you what the output voltage should be.

You can check this formula out with JL's specs for each load. I got real close to 500 watts for each load for the 500/1

[note] don't forget to measure off the bridged outputs if your bridging the amp.

-Fishy
 

Bronze Member
Username: Fishy

Tamarac, FL USA

Post Number: 42
Registered: Sep-04
Oh yeah. I think I might go try setting my gains like this. Where would one aquire one of those test tone CD's or whatever they are?

-Fishy
 

Silver Member
Username: Southernrebel

Louisiana USA

Post Number: 184
Registered: Mar-04
you could download a sine-wave (tone) generator and create your own test CD...

here it the one i use:

www.nch.com.au/tonegen
 

Bronze Member
Username: Fishy

Tamarac, FL USA

Post Number: 49
Registered: Sep-04
cool, thanks
 

Silver Member
Username: Insearchofbass

Post Number: 570
Registered: Jun-04
this is cool info thanks guys
 

Bronze Member
Username: Fishy

Tamarac, FL USA

Post Number: 80
Registered: Sep-04
Hey sean, Jonathan said something about using a dummy resistor matching your speaker load if your amp doesn't have a regulated power supply. I still don't understand why this is necessary, but someone was doin this with a BP600.1 and apparently couldn't get the voltage high enough w/o using a 1 ohm resistor. What was strange was once he got the voltage and removed the load his voltage stayed the same.

I don't get it but it seems a dummy resistor may be necessry to use this method with amps with unregulated power supplies.

-Fishy
 

Silver Member
Username: Insearchofbass

Post Number: 578
Registered: Jun-04
thanks fishy well have to ask jon why this happens
 

Gold Member
Username: Jonathan_f

GA USA

Post Number: 1691
Registered: May-04
I answered that on this thread:
https://www.ecoustics.com/electronics/forum/car-audio/94353.html
It'll explain to anyone curious about this.
 

Silver Member
Username: Insearchofbass

Post Number: 579
Registered: Jun-04
thanks jon just read it
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