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[Art Welter]

Chris,

Thanks for the test!
For what it's worth, when testing the NU4-6000 with two bridged mono pairs each driving four ohm loads just below the illumination of the clip/limit light each put out 85.5 volts at 60 Hz. The mains voltage on a 100' 10AWG 120V line dropped from 118.1 volts down to 107.2 volts, drawing 31 amperes. If the power supply was a full 120 volts, output would probably be around 96 volts bridged mono.

Using just one bridged mono pair, the amp ran for 40+ seconds before I terminated the test, as the amp was drawing 19.8 amperes, and the "tired" 20 amp mains breaker had popped several times in various tests already.

Art

[Dennis Wiggins]

...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.

I did plenty of "no load" testing to determine structure. I trimmed pink noise to be at Unity at main outs and on the channel strip. I typically run program between -20 and -10 w/extreme peaks at 0. This is the max I design for, leaving plenty of room for "screw-ups." The VSX is set to start limiting at +9,  2.5:1.

The self-noise (a slight, noticeable "hiss") of the VSX26, which outputs directly to the amp channels, triggers the NX4's "signal" LED right at "3 O'clock." This is normal (edit: for a VSX). I backed off one click.

I always back off the amp inputs to "noon" at the beginning of a show and advance, as necessary, as the gig progresses. This is specifically why I needed 4 amp channel controls at my fingertips. I like my mixer to be the same all the way through a show.

With the output I am hearing (albeit, indoors), I doubt that I'll get near the B's limiters, except when I add Kosmos effect which will easily cause the sub channels to hit the B's limits (it does the same with the IPR3000). As always a little of that goes a long way.

It's raining. Bummer. I want to crank it up all the way.

Thanks to All!

[Art Welter]

The self-noise (a slight, noticeable "hiss") of the VSX26, which outputs directly to the amp channels, triggers the NX4's "signal" LED right at "3 O'clock." This is normal. I backed off one click.

Dennis,

The change in meter ballistics between the NU4 and NX4 is funny, Behringer got it wrong on both-
NU4 uses -24, 12,-6, limit, the NX4 is -40, -6, -3, limit. Who cares about -40 dB, less than 1/10th of a watt at 4 ohms?

That said, I still wouldn't consider a 40 dB signal to noise ratio "normal" for this century, but we all get used to different stuff  .

Art

[Chris Grimshaw]

Yeah, the NX series effectively have meters that jump from "I'm doing almost nothing" to "I'm in the last few dB of headroom". Nothing in-between.
The NU series got the LEDs better in that regard.

Chris

[Dennis Wiggins]

...the NX4 is -40, -6, -3, limit. Who cares about -40 dB, less than 1/10th of a watt at 4 ohms?

For Ceremony to Dinner Music to Dance Hall -40 to -6 is exactly the "guard rails" I run between on my mixer. Pure dumb luck, I guess.

-D

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