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Post new topic Loud thump when turning amp on
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Author Topic:  Loud thump when turning amp on
Tommy Boswell


From:
Virginia, USA
Post Posted 4 May 2017 9:08 am     Reply with quote

How many of you Peavey 400 amp users hear a loud thump when you switch on the power? Does that mean there's something wrong with the amp? And is it easy to fix?

My amp sounds great otherwise, just have to wonder if it will damage the speaker.
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Rick Johnson


From:
Wheelwright, Ky USA
Post Posted 4 May 2017 9:12 am     Reply with quote

Both my NV400 and Session 500 do this too.
Its just a surge of sorts energizing the speaker.
They did when brand new too.
Try turning the volume down before you turn it on.

Rick

www.rickjohnsoncabinets.com
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Tommy Boswell


From:
Virginia, USA
Post Posted 4 May 2017 9:23 am     Reply with quote

Thanks Rick. It's my first 400, a Reno loaded into a very fine Rick Johnson cabinet...looks as good as it sounds!
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Tucker Jackson


From:
Portland, Oregon, USA
Post Posted 4 May 2017 9:27 am     Reply with quote

There was a thread on the forum many years ago about this. The upshot was that lots (most?) NV400s make a loud pop sound when powered on. It's considered a normal quirk of the amp and it apparently doesn't cause any damage.

My 400 does it... but I do keep volume and gain knobs set to zero before hitting that power button on.
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Lane Gray


From:
Topeka, KS
Post Posted 4 May 2017 9:47 am     Reply with quote

It's called the Peavey Pop.
Unless your speakers are weakened, it's harmless.
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Brad Sarno


From:
St. Louis, MO USA
Post Posted 4 May 2017 6:47 pm     Reply with quote

Agreed, normal and harmless. It's a simple amp, and that's a good thing. It has no mute or timing circuit to deal with the power-on pop. Just live with it. Totally normal for that amp.

B
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Stu Schulman


From:
Ulster Park New Yawk
Post Posted 4 May 2017 11:38 pm     Reply with quote

Both of my LTD's do this!
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Paul Sutherland


From:
Placerville, California
Post Posted 4 May 2017 11:41 pm     Reply with quote

It's kind of fun to turn on or off a Peavey when your amp is mic'd into a large PA. The sound engineers really freak out. I just try to look innocent.
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John Booth


From:
Columbus Ohio, USA
Post Posted 5 May 2017 4:47 am     Reply with quote

Yep, just the ole "Peavey Pop"
They all do it
JB
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Richard Sinkler


From:
Oakdale, California
Post Posted 5 May 2017 8:24 am     Reply with quote

Paul Sutherland wrote:
It's kind of fun to turn on or off a Peavey when your amp is mic'd into a large PA. The sound engineers really freak out. I just try to look innocent.


The reverb in my NV400 doesn't work, so I use a Hall of Fame reverb pedal. I was running it through my front panel effects loop, but it has developed a high frequency hum. I've been using it between the preamp out and power amp in jacks. If I don't turn both gain controls to zero, it sounds like a nuclear explosion when I turn at on. It will take down an airliner at 20,000 feet.
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Rich Upright


From:
Florida, USA
Post Posted 9 May 2017 5:59 pm     Reply with quote

Every PV I've ever owned did this, & I owned a LOT of PV amps. My current Renown 400 1-15" does it.
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Mike Brown


From:
Meridian, Mississippi USA
Post Posted 10 May 2017 6:32 am     Pop! Reply with quote

Solid state amp, instantaneous power.
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John Dowden


From:
Louisiana, USA
Post Posted 10 May 2017 3:37 pm     Reply with quote

Every tube amp I've had does this as well to some degree.
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Peter Harris


From:
South Australia, Australia
Post Posted 11 May 2017 4:20 am     Reply with quote

I also get a loud thump every time I turn the amp on...
....but only when my wife is trying to use the phone...

Rolling Eyes
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Will Cowell


From:
Cambridgeshire, UK
Post Posted 12 May 2017 6:28 am     Reply with quote

Hmmm, I though *everyone* turned their amp gain down to zero before switch-on or switch-off, or before connecting/disconnecting instruments or other equipment.

It's a valuable discipline, and avoids the risk of inadvertent damage through surges or transients.
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Derrick Unger


From:
Newark Ohio, USA
Post Posted 12 May 2017 12:40 pm     nashville pop Reply with quote

My Nashville 400 makes 3 to 4 loud pops within about the first 20-30 seconds after I turn it on..makes the little clip light come on..doesn't do it again at all even if its on for hours..I just ignore it..doesn't seem to effect it..scares the s**t out of people not expecting it!!!
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Mike Brown


From:
Meridian, Mississippi USA
Post Posted 12 May 2017 1:06 pm     Pop! Reply with quote

Derrick, that is a problem and our techs can resolve it for you. I recommend that you send the chassis to the factory for repair.
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Ken Fox


From:
Nashville, GA USA
Post Posted 13 May 2017 6:57 am     Reply with quote

That may be related to a dirty pot, namely the mid shift pot. Does it make a popping or other strange sound when turned? If so clean it. It can fire of a sound as loud as a 38 caliber pistol when it is dirty!
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Mike Wheeler


From:
Delaware, Ohio, USA
Post Posted 13 May 2017 7:51 am     Reply with quote

I like the new avatar, Ken. And I agree about the mid shift pot needing cleaning.
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Ken Fox


From:
Nashville, GA USA
Post Posted 13 May 2017 10:56 am     Reply with quote

Thanks, Mike. That is my wife, Linda.
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