What purpose to PA bass bin configuration?

[D-MAN]

Can somebody explain the benefits of this method of bass driver coupling?

Is it a frequency response thing or a dispersion thing? Seems like it is currently in vogue out there in PA land...

DM

[TBrennan]

Might simply be a matter of looking different while doing nothing differently. Marketing.

[colterphoto1]

more engine in smaller space. When flying cabinets or stacking them on the stage, it's nice to pack all the power tightly together.

M

[DrWho]

Technically I suppose it narrows the forward dispersion pattern - but

the main idea is to increase off-axis rejection so as to provide more

gain before feedback...or so I'm told. And like colter mentioned, the

cabinets are much narrower which makes them easier to transport - the

angled baffles also reduce the amount of bracing needed inside (because

the woofer motions partially counteract each other) so they weigh less

too.

[colterphoto1]

Thanks Dr., I knew you'd have a more technical reason. I just come up to Chicago and manage stage for you sometime! What an awesome duo we'd be!

GET THOSE DRUMS OFF MY STAGE NOW!!!!

Michael

[DrWho]

Thanks Dr., I knew you'd have a more

technical reason. I just come up to Chicago and manage stage for you

sometime! What an awesome duo we'd be!

GET THOSE DRUMS OFF MY STAGE NOW!!!!

ROFL - I can so picture you doing that, perhaps even throwing monitor

wedges at the deaf drummers to get their attention. I think you'd

actually be a greater assett to have back behind the board - you are so

much better at actually listening to the music instead of listening to

the sound (or sound system). I'll give you a fly swatter and when I get

tweaky when it already sounds fine you can slap my hands []

[colterphoto1]

I'm a heck of a monitor mixer....

and can control unruly guitarists who insist on playing at too high of volumes with the aforementioned 'kick o the stack'!

Michael

[DrWho]

I'm a heck of a monitor mixer....

and can control unruly guitarists who insist on playing at too high of volumes with the aforementioned 'kick o the stack'!

Haha, I've had to that one once - sadly it was the best tube guitar amp

I've ever heard, but I couldn't take the guys cockiness and refusal to

adapt to a very unforgiving environment (not like the band was anything

special either). He promptly set it back up and turned it up even more

in pure defiance - so I promptly remove his source of power (I took

back the extension cord he was borrowing and even moved the power

strips to the other side of the stage). I then gave him a 10" Peavy

piece of crap monitor and ran a direct signal split from his pedals [6]

When it comes down to it, his cockiness was laying my reputation on the

line - no sound guy should put up with that. Needless to say the band

didn't perform too well at that show, but the next time I mixed for

them things went great and it was a pretty good show (I think the fans

enjoyed it more than me too).

The only gigs I get anymore are from being recommended by all the guys

I've mixed for in the past - it's funny because new bands will ask me

why they were warned about their first few times with me mixing for

them. I know it's cocky to say this, but after I get things setup (20

minutes on a familiar system, hour on an unfamiliar one) I know that

any of the problems with the sound are with the musicians themselves -

so I'll spend whatever time I've got left barking about dynamics,

intonation, rhythm, timbre, etc etc (and thus starts the battle against

ego trips and politics)...But you know a band is good when you never

have to touch the mixer once it has been set - which then allows you to

implement all the cool effects and the artistic side of mixing... just

about every band I've mixed with for an extended period of time looks

back and is thankful that I was that annoying cocky stick in the mud -

I just happen to enjoy being annoying too (I wonder if that goes away

with age). []

sorry for rambling, what was this thread about anyway? lol

Oh right, I actually have been toying with the idea of doing a slanted

baffle for when I do my IB subwoofer in my hopefully future home. I was

thinking it'd make it easier to have 8 (16?) woofers on each side for a

total of 16 (or 32). Wouldn't a complete wall of subwoofers introduce a

planar source of sound as long as the listening positions were within

the width of the speakers? Btw, the purpose here is to keep distortion

low....not to shake the neighborhood (though that would be fun to

do on occasion) []

[Nklipsch]

Depends on what frequency is being produced,what will happen. Consider acoustical sizes. 40hz being 8metres long the baffles will do nothing at all. at 2khz there will be some lobing from the large woofers,and the lobes will cross each other like two fingers.

http://www.burton-manor.co.uk/Audio/LAthoughts.htm

This diagram shows the equivalent of two loudspeakers angled at 90° similar to the arrangement with the V DOSc. Here the frequency is low but still showing signs of directivity as the waves darken along the line of the loudspeakers.

[colterphoto1]

yeah man, I like your mix philosophy. That's why we should do some of those 'Saturday in the Park' gigs together next summer. It'd be a blast.

M

[DrWho]

yeah man, I like your mix philosophy. That's

why we should do some of those 'Saturday in the Park' gigs together

next summer. It'd be a blast.

I bet between the two of us we could come up with a pretty killer PA of

our own (how I'd love to give your double-stack scalas a try) - now

just to find some bands that want to play. I've always dreamed of

setting up a venue somewhere and just sitting around all day mixing as

various bands wanted to come through to practice and perform and all

that. It'd be a blast to spend a summer doing that - who knows, we

could make some good cash too.

[WMcD]

Any radiation surface becomes directional as it gets to about 1/2 wavelenght. So off axis response suffers. It looks to me that the angle is there so that off axis response is maintained.

Te other issue is that vertical arrays tend to be narrow in the vertical and broad in the horizontal.

My explanation for this is as follows. Suppose you have three sources stacked and we look at the one in the middle. There is an equal pressure source above and below, so the radiation from that one is squeezed down and up, which is to say, more on axis.

On the other hand there are no pressure sources to the sides, and thus there is a path for pressure to leak out to the sides.

The downside is that at some point we have interference at some ponts in the vertical pattern where the the difference in distance to the listen is a half wavelenght.

Gil