Peak Voltage On The Crown 5000vz - diyAudio
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Old 24th December 2008, 05:33 AM   #1
OMNIFEX is offline OMNIFEX  Jamaica
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Question Peak Voltage On The Crown 5000vz

Does anyone know the peak to peak voltage of the Crown MA 5000vz

I am trying to compare it to the Itech 8000 and, Crown never listed the peak to peak voltage like they did with the I tech.

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Old 24th December 2008, 12:40 PM   #2
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So I take it no one knows?
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Old 24th December 2008, 01:13 PM   #3
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Single cycle 1Khz tone burst is 1760W/8R, or 118.65V RMS, 335.5V P-P

http://www.crownaudio.com/pdf/legacy/103169.pdf
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Old 24th December 2008, 02:20 PM   #4
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Cheers!

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Old 24th December 2008, 02:26 PM   #5
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So the Itech 8000 peak to peak is 200 volts or is that RMS?

I can't seem to locate the tone burst on the Itech 8000 from an 8 ohm perspective.

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Old 25th December 2008, 04:40 AM   #6
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It's hard to tell as the spec sheet measurements are totally different.

http://www.crownaudio.com/pdf/amps/137289.pdf

I suspect the I-Tech amps have regulated switch-mode supplies, so they will have no peak power (above the RMS rating).

The I-Tech power supplies don't drive 2R loads well from the looks of the spec sheets.

My personal experience with amplifiers with switch-mode supplies has been negative. With poor power lines (most small venues) they sounded gut-less, and old-style amps with beer-can sized capacitors and big iron transformers could play louder (even though they were rated at less power).

I would want to use one for a while before I would make a buying decision. Can you rent one, or do you have a local dealer?
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Old 25th December 2008, 06:08 AM   #7
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Cheers djk.

I’ll explain the situation I am going through. At the moment, I own 6 Crown MA 5000vz amplifiers. They have served me well for nearly 14 years with no failures whatsoever. I am looking to purchase two more amplifiers and, figured I would give Crown’s new top of the line a try for many say they perform better than the 5000/5002 for their applications. In addition to having excellent luck with Crown amplifiers, pre-dating my Macro-Tech 5000s.

No matter how I look at the numbers amongst the two (5000vz Vs I Tech 8000) I only see a 2 dB gain if I go the 8000 route. This is why I was requesting the peak-to-peak voltage of the 5000 for it was the last thing that may have brought something new to the table.

However, it has not. Many are promoting less current drawn from the receptacle is a plus. I do not operate my 5000s on 120 volts so trying to get 40 amps from a 120-volt line is not a factor.

My concern is how much voltage or current the I-tech 8000 has over the MA 5000vz when voltage and current from the AC is not limited.

Feel free to correct me if I am wrong with the following.

The MA 5000vz offers two slow blow 30 amp fuses per Transformer. In the MA 5000vz service manual, it states the amplifier can draw up to 80 amps on a 120-volt line feeding it a sine wave at full throttle.

The maximum current this amplifier will draw is 31.2 amps per transformer at 40% duty cycle. So, I should attain 7488 watts if I use a 120-volt line, drawing 62.4 amps.

The maximum current drawn by the I Tech 8000 is 33.9 amps in which, I assume would be 67.8 amps both channels driven. So, it should deliver 8136 watts.

The difference between the two (7488 oppose 8136) renders a 0.3 dB gain.

From a voltage standpoint, the MA 5000vz offers a peak voltage of 167.8, which equates to 7039 watts. The I-tech 8000 offers a peak of 200 volts (I watched an old Crown I-tech presentation that stated 200 volt is the peak and 400 is peak to peak). So, that is 10,000 watts.

The difference amongst the two (10,000 Vs 7039) offers a 1.5 dB gain.

Am I missing something here or the I-tech 8000 only offers a lighter package over the MA 5000vz based on my requirements?

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Old 25th December 2008, 07:52 AM   #8
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Weight may be the only real advantage.

There can also be issues related to the DSP processing (in any brand of amplifier). What happens if the amps (with their processing) are not available? Do you have extra crossovers? Do you have backup EQ? Do you have the time to re-patch and re-EQ?

What happens when the speakers the DSP is set up for are not available? Do you have extra crossovers? Do you have backup EQ? Do you have the time to re-patch and re-EQ?

So ar I haven't seen the need to buy any new amplifiers like this.

YMMV (your mileage may vary).

I own 40~50 amplifiers, the ones that get used the most are the Crest (mainly the CA series).
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Old 25th December 2008, 09:38 PM   #9
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I own a Crown XTI4000 amplifier
Crown publish 1.6kw per channel rms at 2ohms or bridged into 4ohms 3200 watts
yet on my test bench it did 758 watts at 2 ohms and 1400 watts bridged at 4

So to put it Bluntly I don't believe Anything Crown publish.
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Old 26th December 2008, 05:23 AM   #10
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Since the amps are rated at less power into 2R than at 4R it would seem to be a power supply related issue.

I have to wonder is it is just an adjustment, or the actual design?

QSC seems to have the same sort of problems. From what I have experienced, they sound anemic.
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