SA Series Coil Cooling Testing

[sundownz 197]

Testing to see how well it keeps the coil temperature down by seeing how much power compression we get.

Quoted from video :

"Testing our new "woofer power test" rig... we have an adjustable voltage knob on the wall socket to get the power level we want. For the first 2 minutes or so we are trying to read on the "power" setting on the clamp but it didn't want to cooperate so I changed over to simply amperage and voltage afterward. At 2:20 we have 11.64A/61.6V for 717 watts... after a full 4 minutes and 45 seconds at 7:05we still have 11.19A so the sub is still seeing 689 watts. So we are seeing VERY little power compression even above rated power on a pure 60 Hz sine wave after 7 full minutes -- which is not even taking advantage of the air cooling as much as a lower frequency."

I'll use this data to examine how my upcoming tweaks to the cooling system work.

Pretty boring video... but I figured people would get mad if I edited it in any way

[sundownz 197]

This is the voltage adjustment rig - Brandon's custom creation

[CrazyKenKid 64]

now that is awesome!!!

[mrbojang 8]

The fire inspector must love you guys! j/k.

[sundownz 197]

A bit saddened... the brand new Alpine Type-R failed after about 1.5 minutes of the same testing (as close as we could get it anyway).

I'll put the videos up after lunch for that.

[jcarter1885 995]

Kicker CVX, Audique SDC2.5 among other subs in the same category will be next to be tested right? Keep up the hard work.

[sundownz 197]

I'm not planning to test other brand subs at the moment... but I was interested in the Type-R for my own information as I was actually pretty impressed with the design behind it. Still am impressed with the way Alpine worked a one piece frame / shorting ring into it... split magnets are cool too... as is the nice BL curve. But I was let down that it wasn't stronger thermally.

[sundownz 197]

Well here it is... I was very sad that it didn't last longer thermally :

http://www.youtube.com/watch?v=os4TZTpLNSI

"Done to compare with SA-12 results... we dialed in power as close as we could but the Type-R didn't last long. Few samples of actual power applied : 28 seconds = 497 watts / 51 seconds = 667 watts / 1 minute 18 seconds = 717 watts -- woofer didn't last much longer when exposed to a hair over 700 watts. Conclusion... SA-12 coil cooling is more effective."

[sundownz 197]

So it's not a total waste I took some pictures of the Type-R after we blew it... Brandon took the hammer to it before I got many "before" pictures *laughs* It is worth nothing that you cannot remote the Type-R motor from the frame as far as we could tell.

* Around the edges you can see where air vents to the outside in the slits between the top plate.

* The special curve on the pole flattens BL

* One piece frame / shorting ring assembly... the magnet was busted out to see this... magnet is multiple V shaped pieces.

[sundownz 197]

http://www.youtube.com/watch?v=LZ0eZj82gI0

Here we are cutting up the Type-R.

[Kanaworm$ 292]

Dang!

Brandon has a hammer fetish for Alpine Motors ....

Just goes to show the quality of the SA Series! Sundown FTW!

[aimone 4]

can i get some info on how the amp can handle being plugged right in the wall?modded? i've been running amps off of psu's for years the biggestone i have only puts out 400w. so my saz1500 shuts it off when gain is about 1/8th-1/4th up. my trans. went out on my car so my baby's(sub/amp) are doing nothing and i wanna run them from my laptop just nothing to power the amp. so please could u or brandon hit me with a p/m?

[sundownz 197]

can i get some info on how the amp can handle being plugged right in the wall?modded? i've been running amps off of psu's for years the biggestone i have only puts out 400w. so my saz1500 shuts it off when gain is about 1/8th-1/4th up. my trans. went out on my car so my baby's(sub/amp) are doing nothing and i wanna run them from my laptop just nothing to power the amp. so please could u or brandon hit me with a p/m?

It's not an amp - that is why

We put the guts of a 1500-watt light dimmer inside that case and used the terminals as connections for it.

This way we can adjust the power coming from the wall socket to the woofer.

[Duran 387]

Jacob, you crazy

[aimone 4]

hmmmmm........interesting......

[PHATBOi 38]

You guys are my heros, lol. Adjustable wall socket power ftmfw!

[sundownz 197]

Cool story from CES today... I spoke with Jim from Alpine and he worked on both the new Type-R and Type-R shallow drivers; IIRC he designed the majority of both. Very cool guy -- interestingly he was aware of my test and aware of Sundown Audio and our products. Small world ! Talked with him for about an hour and it gives me more respect for Alpine knowing that they actually look at the smaller companies and what we are doing.

I may also re-test the Type-R as Jim also thinks it should have fared better in the test; I also thought it would too based on all the solid engineering. So I'll re-do it at some point to make sure there were no errors.

[ssh 924]

Cool story from CES today... I spoke with Jim from Alpine and he worked on both the new Type-R and Type-R shallow drivers; IIRC he designed the majority of both. Very cool guy -- interestingly he was aware of my test and aware of Sundown Audio and our products. Small world ! Talked with him for about an hour and it gives me more respect for Alpine knowing that they actually look at the smaller companies and what we are doing.

I may also re-test the Type-R as Jim also thinks it should have fared better in the test; I also thought it would too based on all the solid engineering. So I'll re-do it at some point to make sure there were no errors.

Interesting to see how the new type-r does. Wouldn't mess with the shallow though, I bet it'd take a shit real fast

Oh and your setup is literally a woofer cooker

[diablo_331 23]

That is badass.

[SpeedEuphoria 0]

Thanks for the new info, would like to see the retest of the New type R also

so is the R's raised rms rating on the newer ones due to the larger coil, but having less cooling then previous models?

[sundownz 197]

Thanks for the new info, would like to see the retest of the New type R also

so is the R's raised rms rating on the newer ones due to the larger coil, but having less cooling then previous models?

The cooling should be better -- it is well engineered, IMO. It may not function well with low levels of excursion, though. The engineer I spoke with indicated they test with a mix of 30 and 60 hz together so this would generate alot more movement.

[ford302redneck 15]

Thanks for the new info, would like to see the retest of the New type R also

so is the R's raised rms rating on the newer ones due to the larger coil, but having less cooling then previous models?

The cooling should be better -- it is well engineered, IMO. It may not function well with low levels of excursion, though. The engineer I spoke with indicated they test with a mix of 30 and 60 hz together so this would generate alot more movement.

That's understandable. Hard for forced air cooling to work if no real movement.

[sundownz 197]

Thanks for the new info, would like to see the retest of the New type R also

so is the R's raised rms rating on the newer ones due to the larger coil, but having less cooling then previous models?

The cooling should be better -- it is well engineered, IMO. It may not function well with low levels of excursion, though. The engineer I spoke with indicated they test with a mix of 30 and 60 hz together so this would generate alot more movement.

That's understandable. Hard for forced air cooling to work if no real movement.

Much harder -- of course the SA does it well and even better with more movement.