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Class D Switching Power Amplifiers and Power D/A conversion

Behringer iNuke NU3000 Measurements
Behringer iNuke NU3000 Measurements
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Old 21st May 2012, 08:10 PM   #1
bolserst is offline bolserst  United States
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Default Behringer iNuke NU3000 Measurements

I am posting some measurement data on the NU3000 that might be of use to those considering the purchase.

Output Power:
No load max output voltage was 50Vrms per channel.

With resistive loads, power output at clipping was pretty darn close to:
300Wrms/8ohm/channel
600Wrms/4ohm/channel
1000Wrms/2ohm/channel
2000Wrms/4ohm/bridged

So, it seems you can pretty much take the Behringer specs and divide the power ratings by sqrt(2).

It has been brought to my attention that Behringer does provide RMS Power ratings in a brochure, just not in the manual.
They line up well with measurements summarized above. See post#11 below:

Behringer iNuke NU3000 Measurements

It seems that Behringer has removed the link from post#11 containing the brochure with RMS ratings for the NU1000/3000/6000. As far as I could tell, none of the newer brochures contain RMS ratings. So...I attached an excerpt from the older brochure containing this information in post#29
Behringer iNuke NU3000 Measurements

Frequency Response:
Attachment #1: Resistive load test
Attachment #2: Capacitive load test
Attachment #3: Inductive load test
Attachment #4: ESL load test


In Summary:
- For the money this amp puts out plenty of power, but load induced HF response changes indicate it is probably best used for subwoofer duty.
- The DSP is pretty slick. In particular, very handy to be able to dial in limiter setting in real time to keep woofer excursion below the clatter zone.
- Not recommended for driving ESLs.
Attached Images
File Type: gif iNUKE_3000_test_R.gif (177.8 KB, 4892 views)
File Type: gif iNUKE_3000_test_RC.gif (182.7 KB, 4564 views)
File Type: gif iNUKE_3000_test_RL.gif (161.7 KB, 4714 views)
File Type: gif iNUKE_3000_test_ESL.gif (194.0 KB, 4501 views)

Last edited by bolserst; 12th October 2013 at 12:31 AM. Reason: Added link to Behringer RMS Power rating brochure excerpt.
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Old 22nd May 2012, 05:50 AM   #2
Soldermizer is offline Soldermizer  United States
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Thanks for the info. I was satisfied enough to buy two While discussed at length in other threads here, I "modded" mine to silent operation by no fan/no cover. So far no problems. Based on my limited tests, I can get perhaps 14 w/Ch (continuous) into 4 ohms speaker before the thermal protection shuts down a channel. Of course with the far higher peak voltages this amp can do LOUD. Even with the no fan limitation, a NU3000 puts out plenty of power to drive 4 Bose 901 (series II) loud enough to annoy the girlfriend and the neighbors

Last edited by Soldermizer; 22nd May 2012 at 05:52 AM.
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Old 22nd May 2012, 07:25 AM   #3
ashok is offline ashok
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Behringer iNuke NU3000 Measurements
With 6 ohm speakers which drops down to 4 ohms somewhere at HF , my nu3000 doesn't sound bright or spitty. Sounds nice actually. However I prefer my regular AB ss power amp. I actually bought the nu3000 for sub use but wouldn't hesitate to use it for normal stereo use with regular speakers as it sounds quite nice. In some areas better than many good ss amps I have heard.I focus more on the music even though I spend so much time and effort to improve the reproduction chain. When I'm on to some real nice music , small imperfections cease to matter !
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Old 22nd May 2012, 10:23 PM   #4
noah katz is offline noah katz  United States
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What freq was power measured at?

For HT sub use it would be useful to know what it is at 20 or better yet, 10 Hz.
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Old 22nd May 2012, 10:35 PM   #5
bolserst is offline bolserst  United States
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Output power at clipping measured for 30Hz & 1kHz was essentially the same.
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Old 23rd May 2012, 05:53 PM   #6
Soldermizer is offline Soldermizer  United States
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I am agnostic on the question of "Do amps sound different?" One faction would have you believe that if it measures the same, it should sound the same. This sounds like a good supposition. However, this thread points to the opposite problem: many amps do measure differently, or in the present case, different frequency responses into varying loads (simulated or real). So it is possible, likely even, that two different amps driving a given speaker(s) may sound different due to most likely the frequency response, but perhaps other factors (phase? slew rate?).
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Old 23rd May 2012, 06:18 PM   #7
ashok is offline ashok
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Behringer iNuke NU3000 Measurements
It's always interesting to investigate differences between amps but the bottom line is always if it sounds good enough ( even though different from others ) to be listened to with good music . Differences can then be investigated after enjoying the music ( with some 'spirit' water ? ) !
Life is short , so more time must be spent enjoying music than investigating the differences ! So as you get older , less time must be spent investigating and more time spent enjoying music ! You never know when you are going to kick the 'damn' bucket !
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Old 24th May 2012, 02:58 AM   #8
Soldermizer is offline Soldermizer  United States
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Well said.
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Old 25th May 2012, 05:15 PM   #9
bolserst is offline bolserst  United States
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Quote:
Originally Posted by noah katz View Post
For HT sub use it would be useful to know what it is at 20 or better yet, 10 Hz.
Out of curiosity, I tested voltage and continuous power output for 20hz & 10Hz.

With no load:
20Hz = 49Vrms
10Hz = 44Vrms

With 8 ohm load:
20Hz = 282 Wrms
10Hz = 230 Wrms

With 4 ohm load:
20Hz = 475 Wrms (< 10 seconds)

After about 10 seconds, the power output dropped back to 280Wrms.
Based on this, I skipped the 10Hz and 2ohm testing.
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Old 28th May 2012, 07:33 PM   #10
JarreYuri is offline JarreYuri  Sweden
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I wonder how it would cope with Speakers like the Apogee Scintilla that has a 1 Ohm load.
Driving the bass in that case...

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