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Testing & Scientific Data Discussion Results from Speaker and amplifier Testing


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  #1  
Old 09-24-2013, 07:20 PM
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Default Pure and Popcorn

It never ceases to amaze me how difficult "budget" amps make it for me to test them. Whether that be unstable voltage, messy, noisy or generally funky AC waveforms, inconsistant QC and/or results... whatever. They make it pretty difficult to get an idea of their performance.

I've also been asked why in the hell I "waste my time" testing amps like this. Well, it's because people are broke. And I know people are going to buy budget amps no matter what I say or no matter how much I advise against them. So, let's at least see what people are getting themselves into. That- and we all know what "good" amps do. AND maybe, just maybe... one day we will strike gold on that magical amp that defies the "you get what you pay for" golden rule.

With that said... I made a pretty scathing post about the Pure Audio 3000 in the Zv.4 vs HD thread. I got a brand new, in box amp to test for the owners and just reported what I got.

The amp made 80v clean unloaded. But AS SOON as I put a load on it, it went to shit. On that particular occasion, I went right to 1 ohm resistive and saw this from the gain and volume position where I had set it unloaded.



Yeah... that's fugly. That's ~ 2,600w at 1 ohm resistive and 57% efficiency.

Well, upon further inspection... I found that I couldn't make the sum'bish do clean voltage no matter what I did. This is making a whopping 18w @ 2.5 ohms resistive at gain and volume position nothing.



Still fugly. All of this was a bit of a head scratcher because this was the 3rd one of these I'd tested and the other (2) weren't anything like this. AND it made 80v clean unloaded.

It became pretty obvious that the amp I have may be a bad one. So, to verify, I had the guy from this test... My test: Pure Audio PA-3000.1D (quick and dirty) bring one of his in for me to double check. I just ran a quick test of it at 2.5 ohms resistive and it came out just fine. It did 775w @ 2.5ohms and 12v with 73% efficiency. Not earth shattering, but at least it was clean. Noisy... but not clipped.

This is the kind of shit that happens when you buy new at $0.10/watt. But whatever. I'll pursue more comprehensive testing of it when I get the time. And a new amp.

For the second half of this... A Popcorn 6k made its way into the shop somehow. This isn't going to be a full write-up, just a quick screen shot and initial impression.

When I went to snatch this thing up, I had to get my feet under me. It's much heavier than I thought. And you guys know I like hefty amps. It's a big bish. Like a 6k ought to be. I don't have any pics of it, but there's plenty out there. Dual power and grounds. And I suspect they're 2/0 because 1/0 "CA" wire went in smooth with no frayed stands. Single set of 8awg speaker outputs. Lame, but whatever.

I set about setting it up like I always do. Unloaded with a scope and voltmeter. This is where it gets into the making it difficult for me part. I couldn't find a sweet spot on this thing. It was either millivolts or between 120-170v. And when I say "between"... I mean it. It was jumping all over the damn place. 123, 162, 154, 131, 173, 140... WTF?!?! Ugh. AND the wave looked just like it does in the loaded screen shot. Shit on it. I left it at the minimum gain position where it was making anything over millivolts.

I didn't have a ton of time to test, and since 2.5ohms resistive is my new favorite load...



What you see here is ~ 2,100w at 2.5ohms (resistive) at 11.8v pulling 220A (~ 80% efficient) and whatever THD you want to call that wave. That's as good as I could get it.

I don't know what the amp is rated for- 6k @ 1, 3k @ 2, maybe. So it's right there at rated on fixed resistance and really low voltage. And with good efficiency. Not so clean though.

So, stay tuned for more testing of that one too.

Pure and Popcorn. Exhausting.
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Last edited by TaylorFade; 09-24-2013 at 07:45 PM.
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  #2  
Old 09-24-2013, 07:29 PM
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So the old popcorn treats u well ay? Not bad power for a half working amp if u peek inside, there's a tracer/resistor/cap that needs a tune up, Murphy knows
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Old 09-24-2013, 07:31 PM
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thanx for the time you take to do these tests and for sharing the results.
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Old 09-24-2013, 07:54 PM
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I got two pop 6k
They are heavy.
They share the same board as opti7k so:

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Old 09-25-2013, 06:29 PM
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Hey Tfade, check out my dso army of accessories haha

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Old 09-25-2013, 06:39 PM
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Quote:
Originally Posted by BKNIGHTS View Post
Hey Tfade, check out my dso army of accessories haha

where did you get those man?? would be very handy for anybody with a dso nano
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Old 09-26-2013, 11:54 AM
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Quote:
Originally Posted by djscrubb View Post
where did you get those man?? would be very handy for anybody with a dso nano
most of it was from - Electronic digital products and spare parts accessories wholesale goodluckbuy.com and the rest was from amazon.
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Old 10-30-2013, 09:06 AM
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I'm late to this party but I was really hoping this was going to be the 2500 popcorn. I have that amp now and have been waiting for someone to test one. It only cost me $100 plus shipping brand new so I don't expect much
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Old 11-01-2013, 10:29 AM
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Just so you all know, I bought from JC when he first hit the caco scene via ebay.

I bought 4 popcorn 2500s ,. as the 4ks and the 6ks were already sold out.


I ran the first 2, and immediately upon cranking the CAR, I started bellowing out white smoke.

I called, sent him the amp back, and he sent me another.

Good service that JC Kim had for sure. I mean warranty on a dam $100 dollar amp?? Hellz yea.


Anyway, so once I had 2 fully working amps, I saoid fucc it and I strapped them hoes at .5 (.25 each amp) on my zv3s and managed to pull a 151 with a weak ass wall setup.

The amps were legit.

I clamped my first 2 and they were almpost identical.

Clamped 1811 watts @ 2.2(calculated)

So I know for sure at .5 and no rise, this amp was capable of making rated and then some.
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Old 11-02-2013, 07:37 PM
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Quote:
Originally Posted by nicholasmccabe View Post

I called, sent him the amp back, and he sent me another.

Good service that JC Kim had for sure. I mean warranty on a dam $100 dollar amp?? Hellz yea.


I had to send someone to JC's house after 3 months of excuses before I finally got my amp. I wouldn't call that good service lol
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