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PostPosted: Mon Jun 12, 2017 5:12 pm 
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Sup

I was talking to my friend and told him that I cut my Titans at 45 or 50hz, since the woofer starts sounding wierd when loaded with too many volts. He then asked, if we could try and use his Turbosound cabs for the lowest frequencies. The 45hz and down. We'd set it up with a driverack and make sure that they overlap. I know that his turbosound aren't gonna perform as loud as my Titans, but I figured adding just that hint of subbass would add to the overall sound-picture.

Would that work?

Thanks!

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PostPosted: Mon Jun 12, 2017 5:24 pm 
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Recipe for disaster. Read your plans. If they don't go low enough you need T60. If they don't go loud enough you need more of them. And if they sound weird with too many volts that means you don't have them correctly limited, which insures they can't get too many volts. If you have to high pass T48 at 50Hz you're doing something wrong.


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PostPosted: Mon Jun 12, 2017 5:31 pm 
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When you cross over 2 cabinets (say at 45 hz), there will be overlap where the 2 cabinets share frequencies. The reflex cabinets and the horns will have a different time alignment (due to the length of the horn), also the reflex cabinets and the horns will have different phase response (where in time the peaks and nulls of the frequency are). Unless the time and phase are aligned, you will have a mess of sound where the 2 cabinets overlap. Since the phase response of the cabinets varies with frequency, it might be impossible to align them for more than a small bandwidth.

4 T48's should be able to handle down to 35hz on their own.

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PostPosted: Mon Jun 12, 2017 5:41 pm 
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Bill Fitzmaurice wrote:
Recipe for disaster. Read your plans. If they don't go low enough you need T60. If they don't go loud enough you need more of them. And if they sound weird with too many volts that means you don't have them correctly limited, which insures they can't get too many volts. If you have to high pass T48 at 50Hz you're doing something wrong.



With a sine-wave at 40hz - It sounded like my Kappalite 3015LF hit the plate infront of the woofer. I calculated the watts to be around 130.

Is that normal. My cab is 19"

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PostPosted: Mon Jun 12, 2017 5:45 pm 
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Check for air leaks around the drivers, cabinet joints and the access covers:

Take the access covers off. Then using a 1 m length of tubing, hold one end to your ear and go around the driver and inside cabinet joints with the other end while playing a 30hz sine wave at low voltage. After that, put the covers back on and check around them with the tubing and a 30hz tone. Leaks will be very obvious with the tubing.

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Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience


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PostPosted: Mon Jun 12, 2017 5:46 pm 
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Location: Medicine Hat, Alberta, Canada
Grymer wrote:
With a sine-wave at 40hz - It sounded like my Kappalite 3015LF hit the plate infront of the woofer. I calculated the watts to be around 130.

Is that normal. My cab is 19"


You might have to remove the drivers and cut away a little more of the brace in front of it.

_________________
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience


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PostPosted: Mon Jun 12, 2017 6:04 pm 
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CoronaOperator wrote:
Grymer wrote:
With a sine-wave at 40hz - It sounded like my Kappalite 3015LF hit the plate infront of the woofer. I calculated the watts to be around 130.

Is that normal. My cab is 19"


You might have to remove the drivers and cut away a little more of the brace in front of it.



Is there a chance, that the brace is just too deep. I did not build them myself. I bought them from a fellow sound-enthusiast.

And I don't really get your tube-troubleshooting method sorry

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4 Titan48 19" - Kappalite 3015LF

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PostPosted: Mon Jun 12, 2017 6:44 pm 
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Grymer wrote:
I bought them from a fellow sound-enthusiast.

And I don't really get your tube-troubleshooting method sorry



You really should spend $15 for the plans and read 'em all the way through. There is good information in there that you need in order to run them correctly and it will help you to see if there are any problems with the build.

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PostPosted: Mon Jun 12, 2017 6:53 pm 
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Bruce Weldy wrote:
Grymer wrote:
I bought them from a fellow sound-enthusiast.

And I don't really get your tube-troubleshooting method sorry



You really should spend $15 for the plans and read 'em all the way through. There is good information in there that you need in order to run them correctly and it will help you to see if there are any problems with the build.


I am awaiting my T48 plan along with a plan of the DR250 :)

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4 Titan48 19" - Kappalite 3015LF

Copenhagen, Denmark


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PostPosted: Mon Jun 12, 2017 8:38 pm 
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Location: Medicine Hat, Alberta, Canada
Grymer wrote:
And I don't really get your tube-troubleshooting method sorry


Use a length of plastic tubing as a stethoscope but only use one ear. The other end of the tube you move along all the joints, drivers, acces panel to listen for air leaks.

_________________
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience


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PostPosted: Mon Jun 12, 2017 10:08 pm 
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Grymer wrote:
I calculated the watts to be around 130.


?? that would mean you knew what voltage they were receiving. I that number was the instructed voltage limit then no it is not normal and you will need to go thru the cab and driver to check off proper specs and conditions are met.

Also, as has been stated 4 cabs highpass at 35hz, which is quite audibly different from 50 and after evaluation at proper settings and system specs would remove any thoughts of adding reflex cabs :wink:

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PostPosted: Sat Jun 24, 2017 12:40 pm 
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Location: Tilburg, Netherlands
How many screws are holding the acces cover down? And is it tightened down enough to withstand the pressure at the throat? Good chance you're hearing the acces cover rattling but it never hurts to check for leaks like suggested before.


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