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Powered Mixer/Stereo Amps: my thoughts, and yours


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Oh, I should add:

 

When comparing systems, only use watts when you're buying amp and speaker separately. Then use the watt output and speaker efficiency rating to calculate the dB SPL for the system.

 

Compare these values with the dB SPL ratings for powered speakers. Ignore wattage specs for powered speakers, because it's purely marketing hype and meaningless in the end.

 

Everyone thinks in terms of watts, but (quality aside), it's the dB SPL that matters. Put a thumping honker amp with a quiet speaker and you don't get a loud system!

 

Speaker output SPL ranges over 20 dB, between low-efficiency studio monitors and high efficiency stage systems. That's equivalent to 100 TIMES MORE WATTS! Hard to believe, ain't it?

 

Watt output is like penis size. More only helps if it's used correctly, and if you have way too much you don't get to use it all. Of course, more than enough is better than too little.

 

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Actually this thread has been quite a cogent intelligent discourse - notwithstanding the helpful (and healthy) divergence of opinions. The subject is KEYBOARD amplification, in stereo. The specific issue is how best to amplify non-powered stereo cabs....

Hammond C3, Leslie 122, Steinway B, Wurlitzer 200A, Rhodes 73,

D6 Clav

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Griffinator, you're guessing and you're wrong. Size matters, especially for bass response. Google, do a bit of research, and do the math. Bass response is directly related to area (up to a point, but 15" is below that point).

 

First off, I'm not sure I like your tone.

 

That notwithstanding, bass excursion demands an enormous amount of power at very low ohms of resistance. That Yamaha amp isn't even rated below 4 Ohms. Most low frequency (<100Hz) notes dip speakers into the 2-3 ohm range. If your amp isn't stable in that resistance range, it's not going to put out much of anything in those frequencies.

 

The reason I keep recommending that he employ an amp in the 3-500 watts (RMS, or 600-1000W peak) range as opposed to that Yammy which only puts out 325 peak at 1Khz TEST TONE output, which is realistically only around 140W RMS is to provide the headroom you claim that amp has, even though it doesn't.

 

You are aware that even the lowly JBL MRX512M handles 1600W peak, aren't you? 325W peak output is NOTHING. It's a BINGO amp (one suitable for use at smoky church basements by old men with cheap microphones calling out numbers as they fall out of a basket)

 

The amps I and others have recommended are going to deliver something that Yammy can't - HEADROOM, which gives you dynamic range.

 

And I haven't even started talking about the sacrifices that are made by every manufacturer of combo units like that in order to put a mixer and an amplifier in the same box at a lower price than what one could buy the separate pieces...

 

I've owned two Yamaha powered mixers, older versions of exactly what you have. One of them is sitting in the corner of my basement, gathering dust. Why? Because it couldn't hang in a live performance situation. Nice preamp channels, crap-tacular amplifier, bogus wattage ratings. Replaced it with a Mackie mixer and a QSC amp that did the job 10 times better.

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Watt output is like penis size. More only helps if it's used correctly, and if you have way too much you don't get to use it all. Of course, more than enough is better than too little.

 

:snax:

 

Oh Brutha. :rolleyes::)

 

I know you, Mr. Learjeff... and I kinda figured this might raise it's ugly head somewhere in the conversation. :blush:

 

I remember when right after the holidays, at one of the finest watering holes this side of the state capital, cnegrad's face radiated a bright crimson color. Somehow the conversation between you and BluesKeys had turned to that commercial about "if it lasts more than four hours, then you had better see a doctor". :grin:

 

Of course, I had my PDA loaded with pictures of Jimmy and his new organ... passing it around the table. :rawk:

 

Don't know if you caught a glimpse of the ladies who sat down at the end of the table when they realized what you were talking about... although you are kinda soft-spoken, Jimmy's not. :eek:

 

It was priceless. :P

 

 

"Music expresses that which cannot be put into words and that which cannot remain silent." - Victor Hugo
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Ok, so if someone sprinkles Viagra on an amp, it may or may not push the speakers any harder but the amp will last four hours. :D

 

Seriously, a power amp and speakers manufactured by the same company are normally matched for optimal performance. A mix matched system could be entering the realm of differential equations. ;)

 

Otherwise, a 400-600 watt system should be more than sufficient for a keyboard rig. If not, ask the band to turn down. :cool:

 

 

PD

 

"The greatest thing you'll ever learn, is just to love and be loved in return."--E. Ahbez "Nature Boy"

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Ok, so if someone sprinkles Viagra on an amp, it may or may not push the speakers any harder but the amp will last four hours. :D

 

:cool:

 

 

PD, I think you have a sick sense of humour. :crazy:

 

I like it. :thu:

"Music expresses that which cannot be put into words and that which cannot remain silent." - Victor Hugo
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Otherwise, a 400-600 watt system should be more than sufficient for a keyboard rig. If not, ask the band to turn down. :cool:

 

Yes, a 400-600w RMS amplifier on a pair of speakers that can handle it should be more than sufficient.

 

A 325w peak amp on any pair of speakers could easily be drowned out by a modest 2x12 guitar amp.

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Actually, all of these posts are helpful....

Only the aggro tone isn't.

So, let's stick to facts, opinions, a bit of humility, and a sense of humor

Hammond C3, Leslie 122, Steinway B, Wurlitzer 200A, Rhodes 73,

D6 Clav

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