gain setting x600.1

[sqhertz 5,000+ posts]

i know it was covered before , i searched. came up with this http://www.caraudio.com/forum/showthread.php?t=172048&highlight=x600.1+gain

but i didnt find a definate answer.

i have the gains set at 30 vac , subs are wired at 1.5ohm. but since it puts out 600 at 1-4ohm couldnt i just set it at 49 vac? ( im getting these numbers from this calc - http://www.subwoofertools.com/forum/setgain.asp )

would i do this with the subs wired up when the amp turns on or would it not matter??

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[sqhertz 5,000+ posts]

meh?

 

[helotaxi 5,000+ posts]

The amp accounts for the load wired on it each time it is turned on. You need the subs connected when you turn it on to get the power supply rails configured correctly. From there set the gain with the subs connected. If you start getting distortion, stop there because the subs are asking you to. Figure the voltage based on the load you have wired.

 

[DejaWiz 5,000+ posts]

The amp accounts for the load wired on it each time it is turned on. You need the subs connected when you turn it on to get the power supply rails configured correctly. From there set the gain with the subs connected. If you start getting distortion, stop there because the subs are asking you to. Figure the voltage based on the load you have wired.

Good job on the advice. The X600.1 are known to be underrated (sometimes by as much as 250W), so setting the gain with a dmm while everything is hooked up is the only safe way to go.

 

[sqhertz 5,000+ posts]

Good job on the advice. The X600.1 are known to be underrated (sometimes by as much as 250W), so setting the gain with a dmm while everything is hooked up is the only safe way to go.

ok. like i said...subs are wired down to 1.5 ohm. amp makes 600 at 1-4 ohm.

i can see setting the gains with the subs hooked up but why set the gain for 600 @ 1.5 ohm when i could squeeze out more power by setting it at 4 ohm.

ok say i have a dual 2 ohm sub. wired series to 4 ohm gain set at 49 vac. wired to paralel at 1 ohm gain set at 25.4vac. same sub , same amp. less power at a lower load?

wtf?

 

[DejaWiz 5,000+ posts]

ok. like i said...subs are wired down to 1.5 ohm. amp makes 600 at 1-4 ohm. i can see setting the gains with the subs hooked up but why set the gain for 600 @ 1.5 ohm when i could squeeze out more power by setting it at 4 ohm.

ok say i have a dual 2 ohm sub. wired series to 4 ohm gain set at 49 vac. wired to paralel at 1 ohm gain set at 25.4vac. same sub , same amp. less power at a lower load?

wtf?

Less resistive load = better efficiency? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[helotaxi 5,000+ posts]

ok. like i said...subs are wired down to 1.5 ohm. amp makes 600 at 1-4 ohm. i can see setting the gains with the subs hooked up but why set the gain for 600 @ 1.5 ohm when i could squeeze out more power by setting it at 4 ohm.

ok say i have a dual 2 ohm sub. wired series to 4 ohm gain set at 49 vac. wired to paralel at 1 ohm gain set at 25.4vac. same sub , same amp. less power at a lower load?

wtf?

Because since the amp detects the load on it it caps the rails as needed to produce 600ish watts at the load it detects. Try to set it for a higher voltage than it will give you and all you will get is clipping. You will probably never get the calculated 4 ohm voltage with a 1.5 ohm load connected, the amp won't let you.

 

[sqhertz 5,000+ posts]

Because since the amp detects the load on it it caps the rails as needed to produce 600ish watts at the load it detects. Try to set it for a higher voltage than it will give you and all you will get is clipping. You will probably never get the calculated 4 ohm voltage with a 1.5 ohm load connected, the amp won't let you.

ok that makes a lil more sence.

i emailed PG to get a definate answer. Ill paste it here when i do.

thanks for teh help..

 

[sqhertz 5,000+ posts]

this is from teh PG rep-

"Find the rated power of your amplifier per channel since you are using a Xenon use the 4ohm output rating.

Do the math to calculate the target voltage you need in order to adjust properly with your DMM.

root(wattage * speaker load) = voltage

Now, play a 60 Hz or 50 Hz 0dB sine wave, and turn your HU up to just below clipping, which should be about 3/4 - 7/8 of the way up. Set your DMM to Volts AC, and measure across the amplifier's speaker output terminals while the speakers are disconnected. Turn to gain up until you get to your calculated Volts AC."

"Since the am is a regulated design make all your calculations at 4 ohms."

hope thatll clear up things for others as well...

 

[helotaxi 5,000+ posts]

Gotcha. Multi-rail design, makes sense actually. The amp assumes 4 ohms on an open circuit which I now remember was the basis of a design to trick the amp into thinking it was on a 4 ohm load and getting it to increase power as the impedance was dropped. Since all you are doing is setting the input stage to match the signal voltage, the multi-rail switching has no effect on that. Just needed that little catalyst to get me thinking about how it would work.

 

[psych0ticnemes1 5,000+ posts]

just fyi, i needed my gain close to 3/4 before i got the necessary voltage when i had that amp

 

[helotaxi 5,000+ posts]

just fyi, i needed my gain close to 3/4 before i got the necessary voltage when i had that amp

So? Doesn't mean anything.

 

[psych0ticnemes1 5,000+ posts]

So? Doesn't mean anything.

I was letting him know that it isn't a bad thing in case he had to crank his gain too

 

[sqhertz 5,000+ posts]

I was letting him know that it isn't a bad thing in case he had to crank his gain too

yeah , i think all xenon amps are like that. mines around 3/5 - 3/4 up to get 30vac.