can someone check my math please(gain/dmm)

[Skoty422 10+ year member]

Ok I have a pc275 amp rating: 75x2@4 ohms, 150x2@2 ohms, 300x1@4 ohms

Component speakers rating: 170 @4 ohm

I have them wired to each channel of the amp giving them 75 watts each.

I think the math says the speaker can handle 26v each and the amp gain should be 17v

Right now I have my amp set to 17.2 volts. (on one side it reads 17.2 other side reads 16.8. Y?)

Does this look right? Amp gain is about half way

Click to read more...

 

[West]

17.3 V per side should be your target.

Some amps will put out more power to one side. You should be able to adjust the balance slightly using your deck to send more power to the side showing a weaker voltage.

Are you useing test tones?

 

[dumpbeast86 10+ year member]

Power(volts AC) = square root of{watts(rms) x resistance(ohms)}

 

[dragnix 5,000+ posts]

17.3 V per side should be your target.
Some amps will put out more power to one side. You should be able to adjust the balance slightly using your deck to send more power to the side showing a weaker voltage.

Are you useing test tones?

Don't ask this guy to check your math, he charges for that //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[West]

Don't ask this guy to check your math, he charges for that //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

Lol its fine. The first one is free...

 

[West]

The discrepancy could also be due to the RCA cables.

 

[dragnix 5,000+ posts]

Lol its fine. The first one is free...

ur like a drug dealer bro

 

[West]

ur like a drug dealer bro

//content.invisioncic.com/y282845/emoticons/sneaky.gif.7189749b3a3f769e8815b47e8ae87f88.gif

Op make sure your setting the gains at 2/3 the decks volume to prevent clipping.

 

[Skoty422 10+ year member]

Yes I used a 1000hz test tone. I did it with all crossovers on deck on and sloped.(80prs) and the loudness off. I also tried it with the loudness on and it read the same. I thought it would be different? That's what I came up with is 17.3v but I just wanted to make sure I did it right. (that's y I set the high side to 17.2, just to be safe)

If I turn the amp to 3/4 gain it puts out 27-28v.

 

[AnthonyO 10+ year member]

75watts at 4ohm

so

75x4 = 300

squareroot of 300 = 17.3

So you should be setting your amp with headunit volume at 2/3 volume. Have a 1k freq playing and set the gains on the amp as close to 17.3v/ac as possible

 

[Skoty422 10+ year member]

I have the 80prs and set gains at volume 50. I was told it started clipping at 53. Does that sound ok?

 

[West]

I have the 80prs and set gains at volume 50. I was told it started clipping at 53. Does that sound ok?

Would do 45 to be on the safe side but 50 should be ok.

 

[AnthonyO 10+ year member]

I have the 80prs and set gains at volume 50. I was told it started clipping at 53. Does that sound ok?

My 80prs starts clipping at 47

 

[West]

My 80prs starts clipping at 47

Which is why I suggested 45

#1 lol

 

[Skoty422 10+ year member]

Thank u all very much! Now about that loudness button... The speakers have a lot more bass response and are still very clear at high volumes. I've read on here to not use that except for low volumes but I've also read it will change the voltage to your amp but when I tested it on/off the amps output voltage stayed the same.