*New Test: Sundown SAZ-1500D*

[xclusiv3 10+ year member]

xclusiv3 ,
Yessir, took it in college. When I moved to North Carolina from Maryland in middle school it totally messed up my course alignment... I got stuck in the "regular" path and only got as high as pre-cal in high school. Ah well, I still learned it one way or another!

As much as I hate to say it... homework helps alot in more advanced subjects like Calculus. Recent studies indicate it helps very little for young children but the effectiveness of HW increases as you go up in age and complexity of material. Maybe try at least glancing at the homework //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif I know I had my share of laziness in high school, but I generally made time first thing in the morning to at least get it done to hand in.

lol yea i was exaggerating

i usually do a few problems but recently this optimization crap is like WTH and i couldnt do a single problem....and i thought i was actually gonna do all of my hw....some say calc in HS is easier....but the teacher still sucks.

 

[TypeRBass 10+ year member]

wow...i love e-fighting....and I only noticed *****ing like this in threads made by people on phat hertz testing amps...cool stuff.

 

[xluben 10+ year member]

To get a 100% accurate rating he will need to see the O-Scope results. But he can geustimate. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

how do you figure?

this is about apparent power vs. actual rms wattage

Well, i'm just trying to figure out if he thinks i'm getting less or more power than what my test results provided.

you measured the apparent power (hypotenuse), the true power (how an amp is rated) is along the bottom and is always less than the apparent power (if there is any inductance)

As long as all the amplifiers he tested are tested in the same fashion, it is an accurate guage of comparing them.
nG

not if they use different setups that have different impedance rise. the one with less inductance will be closer to actual 'bench' results while the more inductive setup will be more of an exaggerated number. (ie. look at the two power triangles immacomputer posted)

if the same person, in the same setup, drops in a few different amps and takes readings, this would be a decent way of comparing the amps tested, but would not be comparable to someone else's tests, ratings, or actual bench tests.

Good point. Now that I think of it you would theoreticly be posting MORE power than real power results. Though 2.2ohm is more of a power rating for a 2ohm nominal impeadance. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

nope, look at the power triangle.

 

[delvryboy 5,000+ posts]

Sub is an actual dual 2 ohm sub, so a 1 ohm nominal load would be correct.
For some reason, I see this amp doing a BIT more than 400 watts, especially with the score it was doing.

it was. he is calculating the rms across the board. basically on music.

what you measured is the amount of actual power you are seeing in your box, at your frequency.

 

[tommyk90 5,000+ posts]

not if they use different setups that have different impedance rise. the one with less inductance will be closer to actual 'bench' results while the more inductive setup will be more of an exaggerated number. (ie. look at the two power triangles immacomputer posted)
if the same person, in the same setup, drops in a few different amps and takes readings, this would be a decent way of comparing the amps tested, but would not be comparable to someone else's tests, ratings, or actual bench tests.

The only problem with this is that it is nearly impossible to get the EXACT same setup in every test. Voltage, temperature, everything can make a difference. Impedence can even vary just based on the amplifier itself.

Thus why its always good to say that this is MY test in MY car and performance can and will vary depending on a person's car. Which is exactly what I did. I tested the kicker heads up versus the sundown in as close as possible settings.

 

[xluben 10+ year member]

The only problem with this is that it is nearly impossible to get the EXACT same setup in every test. Voltage, temperature, everything can make a difference. Impedence can even vary just based on the amplifier itself.
Thus why its always good to say that this is MY test in MY car and performance can and will vary depending on a person's car. Which is exactly what I did. I tested the kicker heads up versus the sundown in as close to possible setting as possible.

i agree.

the kicker vs. sundown comparison based on your testing is valid and a great test.

i'm just trying to clarify that you can't directly compare your power calculation to rated power.

and that others can't assume that since you calculated 1000W at 2.7ohms, that they'll get 2000W+ at 1 ohm.

 

[tommyk90 5,000+ posts]

i agree.
the kicker vs. sundown comparison based on your testing is valid and a great test.

i'm just trying to clarify that you can't directly compare your power calculation to rated power.

and that others can't assume that since you calculated 1000W at 2.7ohms, that they'll get 2000W+ at 1 ohm.

Fair enough.

 

[AudioAnonymous 10+ year member]

Wanna test an Ia 40.1 and a Cactus Sounds 5 kW? //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

 

[vetkilr 10+ year member]

Wanna test an Ia 40.1 and a Cactus Sounds 5 kW? //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

Do it tommy:naughty:

 

[bdawson72 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/ohsnap.gif.17c4c91be09a7a4a3995fb7145adac39.gif

 

[Immacomputer 10+ year member]

wow...i love e-fighting....and I only noticed *****ing like this in threads made by people on phat hertz testing amps...cool stuff.

Maybe it has to do with him crying like a baby about somebody trying to help him learn something? I don't care about any teams or any other childish rivalry random between e-competitors. I don't know what happened in the past nor do I know anything about any of you. What I do know is the difference between true power and apparent power. What I also know is that tommy cannot take somebody trying to teach him something new. Sounds like a little kid to me. The "everyboyd hates me because of my team" also sounds like something I would hear a little kid say.

Thus why its always good to say that this is MY test in MY car and performance can and will vary depending on a person's car. Which is exactly what I did. I tested the kicker heads up versus the sundown in as close as possible settings.

Yep. Good job on that.

what you measured is the amount of actual power you are seeing in your box, at your frequency.

No. He didn't measure power but rather Volt Amps. My numbers are also off due to rounding errors and not knowing the exact DCR. Even a change of .1 on my guesstimated DCR can lead to a change of 50wrms. If his meters are even slightly off, the power numbers are going to change drastically.

 

[bdawson72 5,000+ posts]

Maybe it has to do with him crying like a baby about somebody trying to help him learn something? I don't care about any teams or any other childish rivalry random between e-competitors. I don't know what happened in the past nor do I know anything about any of you. What I do know is the difference between true power and apparent power. What I also know is that tommy cannot take somebody trying to teach him something new. Sounds like a little kid to me. The "everyboyd hates me because of my team" also sounds like something I would hear a little kid say.

Yep. Good job on that.

No. He didn't measure power but rather Volt Amps. My numbers are also off due to rounding errors and not knowing the exact DCR. Even a change of .1 on my guesstimated DCR can lead to a change of 50wrms. If his meters are even slightly off, the power numbers are going to change drastically.

I love this guy.

 

[delvryboy 5,000+ posts]

If his meters are even slightly off, the power numbers are going to change drastically.

wouldn't that be true on anyones test?

 

[CBFryman2 5,000+ posts]

nope, look at the power triangle.

I know. I just said what he was posting (apparent power) would be more than real power. ie Hypotenuse > Real power. Thanks for agreeing with me. //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

Considering this amp is rated to 800w@2ohm, and what rise he is experencing is roughly normal for most 2ohm nominal rises, and apparent power is over 1000w, real power is likely around 6-700w.

//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif Re = 0.8ohm.

 

[tommyk90 5,000+ posts]

Wanna test an Ia 40.1 and a Cactus Sounds 5 kW? //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

Send em my way. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif