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Peavey MiniMega 1000

#1,281
The manual states that one should never run the mM without speakers attached. I understand this for tube / output transformer-based amps, but can anyone explain why this is true for this unit? Thanks.
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It's not true. Someone brought that up in this thread a few weeks ago, so I informed the appropriate parties, but is has yet to be corrected in the OM.
 
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#1,284
BbbyBld said:
There's a difference between burst power and peak power. The 2000W peak rating on the box is simply marketing. The peak power of any amp is simply double the continuous power rating.

Burst power is the continuous power you get for a few cycles when playing music through an amp, measured with an oscilloscope. The mM burst power is around 1500W into 4 ohms and I think about 900W into 8 ohms.

Most power amps, no matter what type, do not run from regulated power supplies, so the power supply voltage the amp uses is higher than needed to hit rated power. When using a test sine wave signal and running at full continuous power for a long time, the supply voltage drops to a point just high enough to hit rated power output, and stays at that level for as long as the amp is pushed. If the input signal is removed, the rail voltage climbs back up. That scenario is difficult to duplicate when reproducing music or playing bass. If you play music through the amp, the rail voltage doesn't really get the chance to drop very far, so the amp has extra headroom all the time. This is also why the 8 ohm power rating of some amps is more than half of the 4 ohm power rating, because the lighter 8 ohm load doesn't make the supply sag as much.

The mM power supply is regulated, but only to a certain point. This results in sort of a best of both worlds scenario because the regulation effectively lowers the output impedance of the supply to increase the "impact" of bass hits, in other words, the supply pushes back against the amp load, and the rail voltage is higher than needed to keep headroom in reserve.

One reason why I like using a regulated supply is that the line voltage from wall sockets varies a great deal and sags pretty bad under load, which hurts amp performamce, so the supply regulation fights against that as well.
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Bobby stated in an earlier post that the power amp is his own design, not an "off the shelf" module.
I'm waiting for Musician's Friend to ship me one, have to admit, I'm looking forward to getting it.
 
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#1,288
Woohoo! Can't wait to play tonight.
minimega.jpg
 
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#1,294
senmen said:
Well I just got a mM here for doing a review, brandnew out of the box, and it does not Fire up.
Anyway many thanks for your quick Reply.
But now I have to Send it back first
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Interesting, maybe @BbbyBld could be of help here? I had a concern on an early release of the IPR series and he was a great help. He even arranged a will call pickup.
 
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#1,296
Well I just got a mM here for doing a review, brandnew out of the box, and it does not Fire up.
Anyway many thanks for your quick Reply.
But now I have to Send it back first
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Switch it on and leave it on. It will start. It's temperature related.

We had a shipment to Germany that was missing some updates. We have been working with our EU distributor to get those amps fixed. It may be best to return it and get one with all the updates. If this is a problem for you, let me know, and I'll try to arrange for you to get a replacement quickly.
 
#1,297
Hey Bobby,
I got that one from the German Distributor as I have to Do a review on the mM.
I am freelancing author for the german Bass Quarterly mag.
I will now give it a try to Fire it up like you suggested.
Many thanks for your help!
BTW I have worked on a Freelance basis also for you in the past Translating user Manuals and press releases for Peavey Europe until 3 Years ago....
 
#1,298
Hey Bobby,
I got that one from the German Distributor as I have to Do a review on the mM.
I am freelancing author for the german Bass Quarterly mag.
I will now give it a try to Fire it up like you suggested.
Many thanks for your help!
BTW I have worked on a Freelance basis also for you in the past Translating user Manuals and press releases for Peavey Europe until 3 Years ago....
Click to expand...

In that case, you may know Christoph? He's our rep in Germany.
 

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