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crissty 23rd July 2007 07:06 PM

Scoop Bins + Midtop problem
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I recently made 4x scoop bins & 4x midtops, and had a trial of the whole set.

The scoops have a very lovely base thump & Midtops very loud and clear, using in a 3 way setup.

My basic problem is when i am driving the scoops the clearity of the mids decreases, it is not due to the voltage problem, but because of the movement of the cones of mids, which tends to move a lot with the base thump. I suppose the base drive makes the mids coil move out of the magnetic gap which causes the mids to drop its clearity.

Please help me what should i do.

I have attached the photograph of my setup.

Cal Weldon 23rd July 2007 07:23 PM

Hi Crissty,

Interesting. I deliberately tone back the mid on my outdoor stuff because as the volume goes up, they become overbearing. They sound rather muffled at low volumes but clear once some juice runs throught them.

You say it drops in clarity. Do you mean the level seems to drop?

How is this XO'd? Do you run the mids with a high pass or straight?

Is there any physical isolation between the woofer and the mid cabinets?

EDIT: How come the flag for Greenland is red and white? ;)

Magnetar 23rd July 2007 09:30 PM

Roll off the deep bass - use a high pass filter - another thing to do is make the back chamber smaller.

Foxx510 23rd July 2007 11:21 PM

Can you move more of the mid freq to the top boxes without running out of spl capability?

Magnetar 24th July 2007 02:09 AM


Originally posted by Foxx510
Can you move more of the mid freq to the top boxes without running out of spl capability?

Where do you crossover now? What drivers? What type of crossover?

crissty 24th July 2007 02:51 AM

Its a 3way setup c/o @ 160hz & 2.4Khz.

Now what i mean to say, when i m driving only the Mids (400w) x 4 and tops (100W) x 4, and base amps volume to minimum, the mids are very clear and loud, and the cone movement is very less.

But as i pump 4000W of base from scoops x 4 (1000W each), the base thump is so hard that your shirt & trouser also vibrate and dance to the music :hot: , and the cone of the Mids (xmax is 4mm), also moves as if it is also pumping base from it, which means the cones definately move out of their magnetic gap.

As shown in the Picture the Midtop cabinets are directly kept on the scoops.

Foxx510 24th July 2007 02:58 AM

Are you saying the sound pressure from the bass cabs is moving the cones of the mid drivers? Does it happen if the mids are not running?

crissty 24th July 2007 05:47 PM

Right, thats the problem i m facing.:bigeyes:

Cal Weldon 24th July 2007 09:04 PM

Separate the cabinets?

Foxx510 24th July 2007 10:02 PM

They are in separate cabs already, aren't they? See if there is a certain frequency that is exciting the midbox cabinet airspace, use a tone generator and sweep the low freq. You might need to address that freq by changing the midbox somehow.

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