2 Mj 18 in a Bass Reflex box for DJing

[innsanes 0]

Been looking at mach 5 audio and heard so much good thing about it. I have a friend that Dj's hip- hop and trance. I was wondering how 2 mj 18 would do in a Bass reflex (ported) box off of 1000 rms? Will these be loud enough indoor and outdoor? Usually djs for like 50 - 200 max of people. I know these arent PA speakers but will they work?

[JimJ 11]

Should work well...although most large sub cabinets used like that are horn loaded. More phase issues that way than with a bass reflex, but the gains in efficiency are worth it for DJ'ing.

A Mach 5 18 in a Jensen Imperial Horn-style enclosure would destroy things

[innsanes 0]

Should work well...although most large sub cabinets used like that are horn loaded. More phase issues that way than with a bass reflex, but the gains in efficiency are worth it for DJ'ing.

A Mach 5 18 in a Jensen Imperial Horn-style enclosure would destroy things

Made a model in bass box pro and got 129 db off 1000 rms off 2 mj 18 in a bass reflex

[JimJ 11]

Once you get something in-room, software models get pretty useless.

[JEREMIAH 0]

X2^^

[Tommythecat 0]

And the fact that most drivers you purchase dont have the exact specs a manufacturer listed -> audio just becomes an impossible leap of faith...

[innsanes 0]

Once you get something in-room, software models get pretty useless.

So what are software models for? when its in a room doesnt it mean that i will have some sort of cabin gain?

[Viperoni 0]

Once you get something in-room, software models get pretty useless.

So what are software models for? when its in a room doesnt it mean that i will have some sort of cabin gain?

I completely disagree with models being useless.

Though room nodes do alter FR quite a bit, since you can only design for what you want the system to do and hope it matches well with the changing venue, I'd say design the box to be relatively flat down to 40hz, or even 35hz.

Most hiphop is above 40+hz, but some drops lower, so you might want that extra extension, but dont sacrifice much extra output above 40hz for lower end extension.

[JimJ 11]

A lot of designs model horribly, yet that doesn't reflect what you hear in real life.

They're not completely useless, but you have to know the limitations of the program...

Certain manufacturers have, at times, placed a lot of reliance on modeling over reality and ended up with pie on their faces. It's what you get if you're too tied to the computer instead of the table saw

[innsanes 0]

A lot of designs model horribly, yet that doesn't reflect what you hear in real life.

They're not completely useless, but you have to know the limitations of the program...

Certain manufacturers have, at times, placed a lot of reliance on modeling over reality and ended up with pie on their faces. It's what you get if you're too tied to the computer instead of the table saw

Isn't modeling it in software the first step in planning, then table saw? Software gives us predictions of the outcome, if you don't model it then i guess your just relying on luck if your pulling number out of the blue and cutting while your at the table saw? am i right? You sound like you know everything can you please elaborate instead of posting its useless.

[innsanes 0]

Mark, if you see this i hope ou can chime in with your thoughts on this

[mrogowski 6]

This is a tough call. Most PA subs are much more efficient (98+db) and are designed to deliver frequencies in the 32-45Hz range, which is the 'sub' range for PA. If your friend is doing hip hop this means serious boom in the upper low bass range.

If it were me I would build a box where the sub is a bit exaggerated in this region to make sure he gets the boom he needs without relying on room boundaries. He can always tone things down if need be.

Since it is PA, the boxes will take more pounding than a standard box, so you want to make sure to reinforce the magnet structure.

I think they could work - for smaller venues..

Best,

Mark

[Tommythecat 0]

Honestly, we dragged a couple of them outdoors and set them up with little Horn+12" two-way and they didn't really have the output. Sure - they were better than nothing, and better than some of the other woofers we had laying around in boxes. But I wouldn't use less than 6 18's and 3kW for the music type you list with a good set of PA monitors.

[mrogowski 6]

Well, there you have it, someone speaking from experience. You might want to consider snagging a pair of Eminence drivers that are more efficient and designed for such things.

Best,

Mark

[innsanes 0]

Well, there you have it, someone speaking from experience. You might want to consider snagging a pair of Eminence drivers that are more efficient and designed for such things.

Best,

Mark

Alright thanks guys, venuw is only 100 people, but i guess imma use some real PA speakers then

[Tommythecat 0]

Keep in mind that what I'm talking about is the ability to have chest-thumping kick-drums, outdoors, at a listening distance of 10 meters. If you expect to be indoors, and at closer distances, you might be able to relieve some of the sub-duty. But I still think PA equipment will be an easier solution (whether you buy them for the long run - or rent them on occasion).