Crown MA 5000VZ power on noise

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   Hey Friends!

Need a little insight here: 

Tuning a sound system with 2 VZ's on bass yesterday. Each time either one is powered on a weird sound happens for about 2 seconds. It reminds me of when transformers bolts loosen. 

Tried the amps without inputs connected and the sound was still there so it's definitely internal to both.

Thoughts?

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taurusty Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 January 2007 Location: Jamaica Status: Offline Points: 473	Post Options Post Reply Quote taurusty Report Post Thanks(0) Quote Reply Topic: Crown MA 5000VZ power on noise Posted: 08 April 2017 at 3:28pm
	Hey Friends! Need a little insight here: Tuning a sound system with 2 VZ's on bass yesterday. Each time either one is powered on a weird sound happens for about 2 seconds. It reminds me of when transformers bolts loosen. Tried the amps without inputs connected and the sound was still there so it's definitely internal to both. Thoughts?

cravings Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441	Post Options Post Reply Quote cravings Report Post Thanks(0) Quote Reply Posted: 08 April 2017 at 3:40pm
	do you know the transformers are tight so? i tightened up the transformers on a ma2400 a while ago and it got quieter..

taurusty Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 January 2007 Location: Jamaica Status: Offline Points: 473	Post Options Post Reply Quote taurusty Report Post Thanks(0) Quote Reply Posted: 08 April 2017 at 4:01pm
	No. They have a gig Sunday so advised them to look about it afterwards...

kedwardsleisure Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947	Post Options Post Reply Quote kedwardsleisure Report Post Thanks(0) Quote Reply Posted: 08 April 2017 at 4:48pm
	sure it isn't just the soft start? Is it buzzing through the speakers or coming out of the amp? A 5000 does make a rather strange buzz as it powers up. This is normal and sounds like a moped struggling to go up a hill about a mile off. If it's coming out of the speakers however that's a different matter as they should be silent when turned on.
	Kevin North Staffordshire

taurusty Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 January 2007 Location: Jamaica Status: Offline Points: 473	Post Options Post Reply Quote taurusty Report Post Thanks(0) Quote Reply Posted: 08 April 2017 at 4:59pm
	I suspected soft start, KEL..It's coming out the spkrs...

Elliot Thompson Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175	Post Options Post Reply Quote Elliot Thompson Report Post Thanks(0) Quote Reply Posted: 09 April 2017 at 1:36pm
	Is it a noise like the one played in the video below? Best Regards,
	Elliot Thompson

kedwardsleisure Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947	Post Options Post Reply Quote kedwardsleisure Report Post Thanks(0) Quote Reply Posted: 09 April 2017 at 6:14pm
	there shouldn't be any noise from the speakers at power up. The output modules have their drive biased off until the soft start has finished and the self-checks are ok.
	Kevin North Staffordshire