i think it has more so to do with the power factor. the closer you get back to your nominal load, the more accurate the calculation is going to be. the farther you get away from it, the more "apparent power" you will have, instead of actual power. the subsonic will affect it, but id like to see it turned off to see if it really is.
i think the first test figures a little inflated for this very reason.
immacomputer can probably explain this better than me.
i dont have a problem with the current way of testing. im just saying that i will more readily trust a figure with a 1 ohm rise than a 3 ohm (hence why im trusting the test with the 2 ohm figure a lot more) //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifmeh maybe, but until somebody comes up with a better way of mesuring power in a car atomosphere we can deal with it being a few hundred watts off.
got ya, but in reality how much off could the 1st figure be, serious question as I have never did any research on " apparent power"i dont have a problem with the current way of testing. im just saying that i will more readily trust a figure with a 1 ohm rise than a 3 ohm (hence why im trusting the test with the 2 ohm figure a lot more) //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
I don't need an explanation. I've had plenty of classes covering AC power. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifi think it has more so to do with the power factor. the closer you get back to your nominal load, the more accurate the calculation is going to be. the farther you get away from it, the more "apparent power" you will have, instead of actual power. the subsonic will affect it, but id like to see it turned off to see if it really is.
i think the first test figures a little inflated for this very reason.
immacomputer can probably explain this better than me.
i will search and post back as soon as i find what im looking for. immacomputer did some explaining about it.got ya, but in reality how much off could the 1st figure be, serious question as I have never did any research on " apparent power"
i missed this post somehow. probably when i was editing.I don't need an explanation. I've had plenty of classes covering AC power. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
The subsonic can't be turned off on this amp, or I would shut it off to show the difference. Every amp I have tested that you could shut it off gains a fair amount down in the 30 hz range with it shut off, thus the reason for my statement. Yes the phase angle plays a part too, but the subsonic plays as big or bigger part.
OK, is the 1093.624 at 1 ohm or 4??? ConfusedPart 1:
I used one of my old HD3 12's with dual 2 coils. Amp running at 1 ohm nominal. The is the same box I used to test the AQ1200 and the HD3c's when they came out.
VAC: 66.2V
CAC:16.52A
Apparent power: 1093.624 watts
Reactive Impedance: 4.007 ohms
TL score: 143.8 legal dash
Compared to rated power: 1093.624/750 = 1.458 or 45.8% over rated power!
Part 2 comming soon
its is WIRED to 1 ohm. it ROSE up to 4 ohms at that particular frequency //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifOK, is the 1093.624 at 1 ohm or 4??? Confused
I need to buy you a beer. Thanks.Part 1:
I used one of my old HD3 12's with dual 2 coils. Amp running at 1 ohm nominal. The is the same box I used to test the AQ1200 and the HD3c's when they came out.
VAC: 66.2V
CAC:16.52A
Apparent power: 1093.624 watts
Reactive Impedance: 4.007 ohms
TL score: 143.8 legal dash
Compared to rated power: 1093.624/750 = 1.458 or 45.8% over rated power!
Part 2 comming soon
its is WIRED to 1 ohm. it ROSE up to 4 ohms at that particular frequency //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
WoW! Is this what everyone keeps calling "Box rise" or is that something different? I didn't know this was possible. I thought once you wired down to 1 ohm you were at 1 ohm..How do I keep from having this impedance rise? I dont want it..yuck... How ever I DO want this amp....BAD..Thanks by the way for your quick responses and thanks for posting the results of this test man..you guys rock!1 ohm is nominal, but anytime a speaker is played it has something called impedence rise which raises the resistance the amp sees. Keep your impedence rise low and you get more power; however stiffer boxes usually have better spl, but more rise. Its a give take kinda thing that you really have little to no control over
Impedance rise is unavoidable. A coil moving in a magnetic field is going to have a lot of inductance. Inductance causes a change in impedance. Even without a box or a car, you still get some "impedance rise" because of this.WoW! Is this what everyone keeps calling "Box rise" or is that something different? I didn't know this was possible. I thought once you wired down to 1 ohm you were at 1 ohm..How do I keep from having this impedance rise? I dont want it..yuck... How ever I DO want this amp....BAD..Thanks by the way for your quick responses and thanks for posting the results of this test man..you guys rock!
//content.invisioncic.com/y282845/emoticons/imwithstupid.gif.ff72b14418b3c35ebdf1ccd38da21695.gifImpedance rise is unavoidable. A coil moving in a magnetic field is going to have a lot of inductance. Inductance causes a change in impedance. Even without a box or a car, you still get some "impedance rise" because of this.
It's really not something you need to worry about. Just hook the amp up a 1 ohm like it's recommended, and you will have plenty of power.