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Peavey MiniMega 1000

#1,163
Basshappi said:
Don't know if this has been addressed elsewhere in the thread but does/will the MiniMega have hardware for rack mounting?
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BbbyBld said:
On the bottom, there are three screws on each side that go into the aluminum side extrusions. You could possibly make a template to drill holes in the shelf and use those. You would probably need to remove the rubber feet and get longer screws from your hardware store.

I'd bet you could use industrial velcro with good results if you're not planning on shipping your rack.
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#1,166
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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#1,171
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.
Click to expand...

I won't pretend that I understood most of that, but I did gather that at least power wise, the MiniMega should be just about a perfect match for my f112. Thank you!
 
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#1,173
Some of the first 100 (identified by last 3 digits of the serial) had an issue with the aux in jack grounding on the rear which causes a higher noise floor (hiss and a little hum). Everything else would work normally. It's likely that it would go unnoticed using a cab with no tweeter. We found it early, so no further shipments will have that problem. The fix is relatively simple, so we sent out a service note to our dealers, and have been rush repairing customer units returned to us, such as the one that was in the classifieds.
 
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#1,174
Bassheart365 said:
Pretty crazy to want the minimega when I have a Puma 900...but if that "burst power" is real I might just order one...
Click to expand...

If it's any consolation, I've got a Puma 900 (and a Shuttle 9.0) and have a MiniMega on order. I tell myself it's good to have a variety of amps around for customers to demo cabs.........
 
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#1,175
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.
Click to expand...

Great post, Bobby! I have to say, I appreciate your honesty as much, if not more so, than your (impressive) engineering/design chops! :thumbsup:
 
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#1,176
I agree Tom! I learned a lot from that post about the behavior of these amps and why the 8 ohm ratings are more than half of the 4 ohm ratings not to mention the info about continuous, peak and burst ratings. Also the way that the power supply regulation affects headroom and response. Great stuff and thanks to Bobby for being so informational and forthcoming. Kudos to you.
 
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#1,179
John D Harris said:
Anybody have both the Peavey MiniMEGA & the Mesa D800?
I'd love to hear how they compare.
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The Peavey is a bit more neutral and open, and the D-800 is a bit more voiced, but in a musical way. More options/features with the MiniMega, and a bit more horsepower, but the D-800 is reasonably flexible, and plenty loud for my purposes.
 
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#1,180
tombowlus said:
The Peavey is a bit more neutral and open, and the D-800 is a bit more voiced, but in a musical way. More options/features with the MiniMega, and a bit more horsepower, but the D-800 is reasonably flexible, and plenty loud for my purposes.
Click to expand...
Tom, without engaging the Crunch feature or any of the other doodads (Kosmos, compressor), how would you compare the two amps in "harmonic interest" and in evenness/solidity/support of the notes across the registers of the bass -- i.e. are notes in the middle of the G-string as well supported as notes low on the A and E? How about pitch definition down low?

While I'm being greedy for information, how does the new Genzler amp (if you've had a chance to play with it) compare on those counts?

Danke,
Mark
 

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