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Thou shalt not mix sub and woofer driver sizes where you put same freqs thru different size drivers.....No 18's & 15's on the same freqs, no differing mids on the same freqs....If you mix horns, they need to be crossed identicly and stacked on top each other to couple......It's a rule.

Really, it is.

Causes odd things to happen if you do stuff like that ...

You see back line amps with larger/smaller woofers, but they are always the same size in each amp, and each amp is for a diff inst.

Keith, I have never mixed sizes, actually never thought of it, but what is the reasoning behind NOT mixing?

Personally I prefer 18" subs, 15" bass drivers, 10" mids and horns.

Well, after careful consideration of all of your advise, I am going to create a sextuple-amped system out of all of the speakers I own.

I'm just kidding. I'm going to stick with what I have and focus on improving in other areas of my sound!!

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C Mc
KJ, FL

This same conclusion has been arrived at time and time again..We were debating this years ago and the most efficient system is a bi-amp on the ceiling angled down and a big bass bin on the floor. To properly disperse sound it is better and more efficient to add fill speakers in critical areas rather than jack up the wattage in 2 speakers. I have "lit" large lounges bowling alleys and all kinds of venues more often than not with 70 volt systems in the ceiling. The audio quality isnt as good as a 2 way or 3 way speaker but it does provide a constant volume from one end to the other Certain areas can be controlled with L-pads to attenuate the volume as desired. Or certain areas an be lit in stereo or quasi stereo.. I followed this just to see what the final result would be and its still the same...

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Right, but bi-amping doesn't nesessarily add more power (although it does technically in the end), it cleans up the sound & gives certain frequencies dedicated power - such as a sub/bass frequencies, which is very power robbing from the rest of the system on a 1 amp system.

As for a true tri-amp capable enclosure, yes they are out there & they aren't the typical dual 15" drivers.  
http://www.carvin.com/products/single.p ... 53&CID=TRX
I know McCauley makes some, JBL & Peavey used to make some.  They aren't as commonly made as they used to be, simply because of the added expense & nowdays, some of the 2 ways can sound just as good.

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That Carvin bin looks good and probably sounds good, but its' only 42" high.   Not high enough to get the horns up above the crowd.  So as far as I'm concerned it's junk.   You'll be wasting money if you use a set up like that.  Half way across the room, nobody will hear it.    All of the highs will be blocked by somebody's body standing in front of it.

I said it would be ideal as far as the sound coming from the different size speakers.     Never thought about size conflicts as far as them working against each other.     That setup would require each to be amped seperately, correct?     I know the twin 15" bass speakers sound different than my 18".    The same with the Mids between the 15" and the 12".


Thanks for keeping us honest, Keith.

Well just because it doesn't do what you need it to do doesn't make it junk - these are very nice speakers.  These are designed to be flown or go on a stage that is already up in the air but for smaller rooms that don't have the room or need large subs.  Same with the dual 15".  So when they are set up in these types of situations, they are above the crowd.  For karaoke, yeah they are probably not going to be the right selection - but to call something junk just because it doesn't work for you  :no: .  



A dual 15" sub vs an 18" sub are going to sound different.  Given that they are both crossed over correctly & have the correct power supplying them.  The dual 15" will actually move more air & have a tighter low end response (as a rule).  The 18" can actually get into lower frequencies & is generally a little looser sounding.

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Anything with sex in it 'sounds' good to me

All I know fer sure is if you got your head in a jukebox trying to do something and a cute lil thing comes up real real close and whispers in your ear...Can we have some free selections? By the time its all said and done the jukebox is locked back up and yur trying to figure out where ur goin next...... They got enough for the rest of the day and night... And yer still out in the cold...

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Fersure Lonman,

For music playback, I'd choose a dual 15' sub anyday over a single 18"...The total cone area is much larger, and as you stated you get tighter-more punchy sound from the dual 15"s....And there is a reason for that as I'll explain below.

There are a few 24" subs out there designed for the lowest audible freqs, but when asked to do the broader range of bass freqs that we usually send to subs, they suffer from their own advantage....Bigger is not better.

As the cone gets larger in diameter, it tends to develop distortion across it's surface as it reacts to the rapid movement of the voice coil....Smaller cones suffer less distortion and can better react over their whole surface accurately in relation to the movement of the coil....On a smaller sub, the whole cone moves without setting up a waveform from center to outer edge.....No surface waveform, better sound.

A voice coil and magnet assemby is called a 'motor' by the engineers who design them...There is good reason for that...Like any other electric motor, it converts electrical energy to motion...But instead of spinning, it moves in n out....

That in and out motion is coupled to the air by the actual speaker cone....So once the motor starts to move, the air starts to move....That air movement becomes more violent and travels farther as you increase power to the motor....

When the air being moved by the motor hits your ears, you sense the disturbance as 'sound'...The more violent and powerful the air movement, the higher the 'SPL' (sound pressure level)...Notice the use of the word 'pressure' in describing the amount of energy contained in the air striking your ear drums.

The more total cone area, the more air gets moved...The smaller each cone, the more accurate the sound ...So several smaller cones always perform better than just one larger cone.

Just saw a tri-amped system the other day.   JBL eon tops are bi amped and use their sub with built in amp.  Tri-amped system.

Yep, that's a tri-amped system.....Now if the tops were full range, it would be called bi-amped, but if only the tops were bi-amped with no subs, then it still a bi-amped system.....It get confusing, huh?

So how did you like the sound?....Was he running full range into the subs and letting them low filter?

My next sub will be this one

What are you running now?

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When I shifted to eons 2 0r 3 years ago I had an old beatup off brand.. I quit hauling it round My regular gigs werent actually big enough to warrant it.

Im not working right now but when I get this old body fixed and start again Im thinking of getting it.  I heard a setup with one it was awesome Forget what the tops were but Im aching to hear one under eons..

A friend of mine ran his shows with 6 EONS & 2 of the JRX subs.  Sound was very good, although it was very overkill for that particular room.  The place only holds 75-100 max.

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I didn't hear them.   He told me if I want to try them out, he'll let me take them.

You most likely wouldn't care for the sound over your Yamaha rig properly bi-amped, crossed over & powered correctly.

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Years ago, He let me use a gray pair, unpowered.    I hated them.    I could take my mixer box to the store and play all day, if I want to.    I could try them all out.  


They sounded cold to me.     The Yamahas sound warmer.   I might not be using the right words to describe what I'm hearing.    It's the same with the SM58s, compared to the audio technicas.    I feel the same way about the Mackie mixer compared to my PV.     Nobody else makes a moveable head mixer anymore so my next mixer might have to be a Mackie.    *OOOOOOoooo.... shivers down my spine*

That's exactly the words.  A plastic box speaker will never have the same sound as a wood enclosure.



Consider the Yamaha tabletop powered board as well!

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