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Old 23rd June 2011, 03:12 PM   #11
jbell is offline jbell  United States
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Originally Posted by tb46 View Post
Hi jbell,

Did you ever get around to doing something like a polar plot for the SS15?

Regards,
I got out the string and the spl meter... but got lazy and only marked 90 and 180 degree marks at a couple key frequencies that is in the 'directivity' area of the chart below.

besides, at the time I originally posted it -- art was arguing that my house at the end of a 100' extension cord away was affecting my readings.. so I'm pretty sure if I were to make the effort to actually do a polar plot, well, I don't think many would accept it. I also found the upright vs side more enlightening than even a polar plot, as the 50hz response is much better on side, and makes the box sound 'lower.'

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Old 23rd June 2011, 03:33 PM   #12
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The problem with horn speakers is the size and weight for a mobile disco.

I have always stuck to plain speaker boxes so they will fit in the motor.

I use a Fane collossus 18 incher and a Eminence sigma pro 18 incher for bass in ported cabinets.
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Old 23rd June 2011, 04:37 PM   #13
Djim is offline Djim  Netherlands
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Originally Posted by nigelwright7557 View Post
I use a Fane collossus 18 incher and a Eminence sigma pro 18 incher for bass in ported cabinets.
SS15: 50Hz-250Hz (103dB) usable from 38Hz, 240 litre cab
THAM: 48Hz-140Hz (100dB) usable from 35Hz, 185 litre cab
MTH-30: 57Hz-280Hz (100dB) usable from 47Hz, 115 litre cab

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Old 23rd June 2011, 05:07 PM   #14
tb46 is offline tb46  United States
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Default SS15 Directivity

Hi jbell,

Naturally, measurements can always be improved upon, but yours are good enough for me, and a heck of a lot better than guessing. It would still be nice to have at least the front and back on axis @ 1 and 10m.

Regards,
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Old 30th January 2013, 11:47 AM   #15
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[QUOTE=ThorstenL;2616484]Hi,



This an old problem. Part of it is that normal subs are non-directional, part is that the DJ/PA is typically near walls, where there is additional room gain for bass. while the middle of the dance floor is always a "bass hole".

To make low bass directional you need either massive horns (and I mean massive, look up the Levan Bass Horn) or subs that use active steering.

Levans and their ilk are severely unportable, active pattern steered subs need multiple amp's and are uncheap.

In the 80's I found that the classic JBL dual 15" "scoop" worked okay for punchy bass across the dance floor (preferably one in each corner), but they do not really go low and they are still rather large, large enough you really want them only for installed sound.

Some may laugh, but the old Karlson coupler does seem to have a few dB gain in the mid-bass over normal reflex boxes and it's weired distortion behaviour makes them sound "lower" than they really go. One can get pretty punchy PA bass out of them, they do like fairly light cones (EVM15L for example) and no floor shaking, but at least they are semi-portable.


i can make the floor shake with mine karlsons.
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