file Corner Loading, horn extensions, & Cardioid Placement

8 years 3 months ago - 8 years 3 months ago #12554 by MAutopsy
hey all, Got some bigger gigs coming up for the system soon, and need some advice. My 4 MTH30's have been performing well and are liked. I feel i am going to need to rearrange the system to get some more response. My thoughts:
1- all four, mouths on the floor facing a wall. How far away from the wall should they be?
2- a stack of four with mouths coupled together with some sort of "infrahorn" extension. Will this even do anything, being they are tapped horns?

Any thoughts or guidance would be great!
Mike

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8 years 3 months ago #12564 by nrpinc
Wall loading is the best route since the wall is already there. Check out this link to see how far to load.
http://billfitzmaurice.info/forum/viewt ... ?f=1&t=398

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8 years 3 months ago #12565 by MAutopsy

nrpinc wrote: Wall loading is the best route since the wall is already there. Check out this link to see how far to load.
http://billfitzmaurice.info/forum/viewt ... ?f=1&t=398

Thanks nate I have read this, does this have the same effect on tapped horns?

Thanks for the help Bitzo! horn extension wont work

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8 years 3 months ago #12566 by nrpinc
Wall loading any bassbin is an advantage weather its a horn loaded box or standard reflex. Some will be louder than others but its an advantage with any bassbin.

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8 years 3 months ago #12567 by bitzo
anther option would be a cardiod cab placement.

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8 years 3 months ago #12569 by MAutopsy
Like this Bitzo?
Attachments:

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8 years 3 months ago #12570 by bitzo
if you have more than 2 bin there's a lot of options
check this , the distance between cab are also important

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8 years 3 months ago #12572 by MAutopsy
thanks for the links guys! read up on Mr Rat too, seems to be very into cardioid setups. From what i gathered today.
1. corner and wall loading should be used in areas with walls obviously.
2. Cardioid setups are something to consider when not using direction bass horns outside or in large areas.

I seem to be learning a bit more everyday. smiley20

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8 years 3 months ago #12577 by MAutopsy
Regarding Cardioid placement, using the method of one cab in front of the other at 1/4 wavelength and delayed, what is the ideal 1/4 length im going for? would it be 63Hz, or something lower?

this would place the front cab 1.361 meters in front of the other, and use a 3.97 ms delay.

Any thoughts,
Mike

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7 years 2 months ago #17588 by phil dekked
The frequency you set your delay to is usually at the centre of the band pass of the sub cabinet? It helps avoid getting near the HPF and LPF filters which will alter the delay / crdioid response.

For me though it`s usually whatever freq and angle needs cancelling the most.

As for horn extensions on tapped horns....



These made a huge difference to the overall output. Mainly by adding more directivety but also by smoothing out the response.

These are the first rough measurements of one bin with temporary extensions.



Blue is single box no extns, red is a very wide / deep horn extn and green is a shorter / narower extension.

We ended up with somewhere inbetween the green and red ...

I do have the measurements we took from that photo somewhere!! That`s why there`s a mic there!

.p.

Assumption is the milkman according to my mum.

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