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CREST Pro 9001 - 4 ohm performance

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mini-mad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2017 at 6:45pm
Originally posted by luton_soundman luton_soundman wrote:

Jheeze just abit of banter.


...so the foil in a fag packet is out the question then...?



If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2017 at 11:35pm
I installed a 9001 in a venue many years ago.  It was wired onto a 32A supply, with something like only 3m of cable, mostly 10mmsq back to the main incomer for the building.

You can get noticable Voltage drops on on supplies in some venues.  In another one I used to work in a long time ago, the bass amp would trip out when the fridges turned on and the desk lamp on the mixer used to flash in time to the beat....

In an ideal world, the supply you're connected to wouldn't matter but sometimes on an older installation or one that's not quite been designed/spec'd properly, it can make a difference.

Running outdoors, potentially on long feeders (under-sized for the length) I've often watched the Voltmeter on the distro bouncing to the beat, sometimes by an alarming amount.




Edited by ceharden - 17 February 2017 at 11:35pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sajti Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 6:08am
We did a relatively big show in the middle of nothing, at a little village. The village has a beautiful 300 years old church, and the major wants to collect some money, to renovate it.
We get the powerdirectly from the central transformer house, which was feed the whole village, 3 phase, 3x63A was the rated power. We used Crest amplification many 8001s for bass, 7001s, and 4601s.
Everything was OK during the soundcheck, but when we started the concert we faced with the problem, that all lights in the village was dimming with the beat of the bass. Even the public lights on the street too. Shocked All amps are clipped heavily, so I have to turn down the whole system with about 4dB.

Sajti

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Post Options Post Options   Thanks (0) Thanks(0)   Quote B_Bender Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 10:01am
just because the plug is blue or red and says 63a, doesn't mean the supply's up to it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 5:18pm
Also, it's not just the ring main capacity, but the contact area and resistance of the plug. A 13A plug has a certain surface area, calculated to safely supply 13A and not 32A. I don't have any UK plugs here, so maybe some volunteer can measuring the contact area for us?  LOL 

Ceeforms obviously give more contact surface, so safer. I´ve seen a fire destroy a building because the local sparky was a bit lazy and didn't fully tighten up the terminals on the feed he gave us for a gig. The contacts overheated and bang. End of the place. I've also seen a 16A Schuko after a few evenings powering 4 x 1k PAR 64's. Not pretty.




Edited by Earplug - 18 February 2017 at 5:18pm
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 5:25pm
We have blown 100A fuses more then once ;-)
Marjan Milosevic
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2017 at 9:34am
Originally posted by MarjanM MarjanM wrote:

We have blown 100A fuses more then once ;-)


You've put M4 bolts in the fuse of a 13A UK plug?!?    LOL  Shocked  LOL


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2017 at 10:18am
Originally posted by MarjanM MarjanM wrote:

We have blown 100A fuses more then once ;-)

Is this a brag about who blows the biggest fuse ,
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jammin75 Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2017 at 10:06pm


blow sum of these LOL
feel the vibes !!!   "Who Feels it Knows it"            Strong like Lion              
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