Sundown Audio test Results

[xluben 10+ year member]

just wondering, is this how the power was calculated:
V_rms * I_rms = RMS watts ?

and

when you write the nominal load; is that based on both drivers having dual 2 ohm coils or is that the DCR?

i guess no one has a quick answer to my question but i need to get other things done, so i'll elaborate a bit more now and then probably won't check back till tomorrow.

my main inquiries are on how the automotive electronics industry would rate an amp vs. how it was done in this test. (ie. how does the CEA rate an amp?)

by definition:

V_rms * I_rms = apparent power [VA]

not RMS watts.

here's the power triangle:

as you can see the real power will always be less than the apparent power.

so, i'd like to know if the CEA (or something else considered 'standard') rates amps using real or apparent power?

and clarification as to whether or not this test was done based on nominal impedance or DCR (and how what is 'standard' for the industry)?

thanks!

 

[Ford302Redneck 10+ year member]

5.4kw out of 2 1500 watt amps is rated power??/

I was saying the 1ohm ratings... Since thats where Im going to be running mine at.

 

[bigbassman Premium Member]

I use P=IV, R=V/I, and (P out / P in)*100

CEA-2006 specifies the voltage, load, and distortion guidelines for amplifer ratings... generally tested in lab conditions on resistors, and specified to indicate power over the bandwidth of the amplifer..

Loyd L.

 

[xluben 10+ year member]

I use P=IV, R=V/I, and (P out / P in)*100
CEA-2006 specifies the voltage, load, and distortion guidelines for amplifer ratings... generally tested in lab conditions on resistors, and specified to indicate power over the bandwidth of the amplifer..

Loyd L.

thanks loyd.

how does the CEA using a purely resistive load when testing amps compare with real-world performance?

 

[bigbassman Premium Member]

resistor testing allows for a more 'controlled' load on the amplifier, as they do not suffer from emf induced impedence spikes, and shifts in the impedence curve due to the box design... the only rise is from heat... and that can be controlled decently well with various cooling methods..

generally from what I've seen between resistor, and reactive testing though.. pretty similiar numbers..

Loyd L.

 

[sundownz Pro Seller]

not quiet what I adspected, guess there rated dead on.

Loyd's voltage dropped to 12.8 volts if you look at his results. With a more stable voltage you will see more power. Also, Loyd's test is REAL power on a speaker load that shifts impedance and is not a lab test //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[sundownz Pro Seller]

well...This is about where I thought they would falll. I knew there was no way that a strapped pair could do 5kw daily....but they did do well. What would loyd suggest the lowest you take a strapped pair daily 1 ohm (showing each amp .5)?
any who...Strong amps. //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif

I'm not sure if I understand your last sentence... but Loyd suggested 1 ohm daily over 0.5 ohm daily on a factory electrical system for current draw reasons, not for amplifier reasons. If you are asking if they will do 1 ohm stapped daily, then yes, but be sure to have a HEFTY charging system -- as you see from Loyd's results they will go into protection under 11 volts.

They were also never stated to do 5kw daily strapped... we saw that for a burst on an FI BTL for maybe 10 seconds //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I thought that was pretty clear in the woofer roundup?

 

[KLUVKUSTOMS 10+ year member]

Loyd's voltage dropped to 12.8 volts if you look at his results. With a more stable voltage you will see more power. Also, Loyd's test is REAL power on a speaker load that shifts impedance and is not a lab test //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Thats nice to know //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[Immacomputer 10+ year member]

so, i'd like to know if the CEA (or something else considered 'standard') rates amps using real or apparent power?

The difference from a purely resistive circuit to one that is part imaginary is not going to be very much if things are controlled well. If the tone used is pretty far away from any major spikes, the power factor will be pretty high which will give you very similar results to a purely resistive circuit. This is especially true seeing that subs are usually not very inductive, except for at higher frequencies.

 

[B_Campbell 10+ year member]

900 shipped now with the sale goign on //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

where?

 

[denim 5,000+ posts]

where?

There is a direct pre-sale price going on for a little longer. The SAX 100.4 was just introduced.

 

Soon the dealers will be doing a full Sundown intro-pricing sale on the entire line.

 

The www.soundsolutionsaudio.com/shop carries Sundown audio. There is also multiple amp discount that I will be putting up very soon.

 

[Ford302Redneck 10+ year member]

Loyd's voltage dropped to 12.8 volts if you look at his results. With a more stable voltage you will see more power. Also, Loyd's test is REAL power on a speaker load that shifts impedance and is not a lab test //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Yeah I realize this last night, I much rather have real world results then some lab results.

Man I cant wait....//content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif

 

[sundownz Pro Seller]

Yeah I realize this last night, I much rather have real world results then some lab results.
Man I cant wait....//content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif

Same here, I'm glad to have Loyd's results out there so I can offer people exact details on power output -- at least at 12.8 volts //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I'd really love to get together enough equipement / batteries to run a battery of testing with a SOLID 13.8, 14.4, 16, and 18 volts. That would be great stuff.

 

[vetkilr 10+ year member]

So if these can run 1 ohm strapped all day then wheres the sale price I heard about?

 

[sundownz Pro Seller]

So if these can run 1 ohm strapped all day then wheres the sale price I heard about?

Low-Hz is doing a sale right now as a group buy. It may only be in conjunction with the SI mag subwoofers, though, you would have to talk to Ben or kevin about that.

You can purchase direct during the pre-sale of the SAX-100.4, but only in conjunction with that amplifier for pre-sale purposes.

Once the SAX-100.4 amps ship to dealers, all dealers will be having an authorized sale on the full line.