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Author Topic: Behringer NX4-6000 reliability?  (Read 843 times)

Art Welter

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Re: Behringer NX4-6000 reliability?
« Reply #10 on: October 28, 2019, 12:09:27 pm »

Awe man, you nicely told me I was wrong! What a great guy!

So yeah, Dennis, what I posted was about the older model NU4 NOT the new NX4 you asked about.
Sorry. Thanks Art.
Perhaps the same could be said for Chris' response ;^).

Other than cosmetic changes, the NX4-6000 appears pretty much the same spec wise to the NU4-6000. From what I have measured the NU4-6000 actually reduces level slightly (about 1 dB) when it's clip/limit light illuminates.
It would be informative to see a side by side comparison to determine if there are any audible or measurable differences between the two models, though for the OP, for a few gigs a year, can't see any benefit to make a change.

That said, I wouldn't be looking to trade my NU4-6000s for IPR3000s ;^).

Art
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Chris Grimshaw

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Re: Behringer NX4-6000 reliability?
« Reply #11 on: October 30, 2019, 08:49:26 am »

I've still got an NU4-6000 sitting around here, and have some measurement gear.

What do you wanna see?
I've got REW, but no load bank. I do have a bunch of 1KW subwoofers, though, which can act as a very noisy load bank.

From what I've seen online, the main difference is that the NX series takes the output feedback post-filter, so there shouldn't be any variance in HF response with load. Should be pretty easy to test that.

These amps, IMO, represent the peak of the price-to-performance curve. They're not the best amps in the world, but you have to drop quite a lot more cash before you get worthwhile improvement.

Chris
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Art Welter

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Re: Behringer NX4-6000 reliability?
« Reply #12 on: October 31, 2019, 02:17:47 pm »

I've still got an NU4-6000 sitting around here, and have some measurement gear.
I've got REW, but no load bank.

What do you wanna see?
Chris,

Cheap load bank- baling wire wrapped around a brick. Used space heaters before, but the bricks were a lot easier, and a lot less noisy than speakers ;^).

I still have two NU4-6000, but have never tested the NX4-6000.
A few days ago you mentioned you have a couple of NX4-6000s.

I'd like to see if the NX4-6000 limiters respond the same as the NU4-6000 limiters, and if there is any difference in the different amplifiers output voltage at onset of limiting.

Cheers,
Art
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Chris Grimshaw

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Re: Behringer NX4-6000 reliability?
« Reply #13 on: November 01, 2019, 06:31:14 am »

Hi Art,

Sounds easy enough. I've got Dad's old 'scope here - if it still works I'll try to get some photos of the clipping/limiting waveform.

I've got 1x NU4-6000 and 2x NX4-6000, so it'd be easy enough to do some comparisons.

The digital mixing desk I use lets me increment the output level in 1dB steps, so I could do steady-state output voltage over a 9dB range, going from -3dB to 6dB into limiting.

Chris
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Art Welter

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Re: Behringer NX4-6000 reliability?
« Reply #14 on: November 01, 2019, 12:47:06 pm »

Chris,

Looking forward to the results!
Good luck with the amp sales.

Art
« Last Edit: November 01, 2019, 01:03:54 pm by Art Welter »
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Keith Broughton

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Re: Behringer NX4-6000 reliability?
« Reply #15 on: November 02, 2019, 08:22:28 am »

Chris,

Cheap load bank- baling wire wrapped around a brick. Used space heaters before, but the bricks were a lot easier, and a lot less noisy than speakers ;^).


I have used an electric kettle (with water in it) and the bonus is a cup of tea when testing is done :D
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Dennis Wiggins

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Re: Behringer NX4-6000 reliability?
« Reply #16 on: November 02, 2019, 10:23:28 am »

...the NU4-6000 actually reduces level slightly (about 1 dB) when it's clip/limit light illuminates.

It becoming clear that my fear that the NX would "sonically cavitate" when it hits its limiters is unfounded. I'm about 99+% ready to purchase when the calendar flips on Jan 1st, unless Santa...  ;)

Update:  I ordered one. I'll be setting limit/knee in my DSP.

-Dennis
« Last Edit: November 05, 2019, 10:24:11 am by Dennis Wiggins »
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Chris Grimshaw

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Re: Behringer NX4-6000 reliability?
« Reply #17 on: November 13, 2019, 04:19:17 am »

Just a quick note to say that I haven't forgotten about the testing, it's just that life has a habit of getting in the way of playing with sound equipment.

Hopefully I'll have something on Friday. If not, next week.

Chris
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Dennis Wiggins

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Re: Behringer NX4-6000 reliability?
« Reply #18 on: November 13, 2019, 06:06:16 am »

...life has a habit of getting in the way of playing with sound equipment.

I received it and made sure it powered up, but had to let it sit until the upcoming weekend. I will be doing my usual un-scientific and hopefully, non-destructive, testing and will report back.

+8degF tends to put a damper on real-life testing outdoors.  ;)
« Last Edit: November 13, 2019, 08:48:37 am by Dennis Wiggins »
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Chris Grimshaw

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Re: Behringer NX4-6000 reliability?
« Reply #19 on: November 15, 2019, 06:32:16 am »

Got the amps and the scope out. After some rummaging to find the probes, and letting the scope warm up for a while, the results are in.

I put a pair of Faital Pro 18XL1800 in parallel on CH1 of each amplifier, set up a test frequency (36Hz, because it showed up on the scope pretty well and is a reasonable distance from Fs) and let them rip.

The amps are identical under overload conditions.

Both amps do the following:
- As you ramp up the levels (I was doing 1dB steps), the first cycle would clip (this was audible) and then the level was cut back so that the sine tone was being reproduced without clipping. You could carry on pushing the level up, and keep getting the same results. I went 10dB into clip and found the same results.
- Left to their own devices, the level seems to stay constant for at least 10 seconds.

Hope that's useful. I couldn't measure the exact voltage output as it was more than the scope could display. It was, however, enough to get those 18" cones really moving (albeit in free-air).

Chris
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Re: Behringer NX4-6000 reliability?
« Reply #19 on: November 15, 2019, 06:32:16 am »


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