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Old 6th January 2012, 07:23 PM   #1
jb0194 is offline jb0194  United States
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Default Help with converting sealed box line array loudspeaker to transmission line enclosure

For the last 4 years I've had a 2-way line array loudspeaker in my system consisting of eight ScanSpeak 18W/8531G-00 midbasses and eight Fountek NeoPro 5i ribbons in a sealed enclosure. F3 is 60Hz, so I augment with stereo subs. I greatly enjoy the music they make and they are "keepers", but I must move to a smaller living space which cannot accomodate the subs. I'd like to simplify in any event. My crossovers are outboard, making life a bit easier. I have no experience with enclosure design, and ask for guidance regarding the feasiblilty of building new transmission line cabinets for my arrays. Manufacturer specs for the ScanSpeak 18W/8531 lists a Qts of .36 which, hopefully, is transmission line friendly. I've no experience with enclosure design and will seek a cabinet builder for the actual changeover. If bass reflex has merit, I'd surely consider. I assume no crossover modification will be required, but let me know if I'm mistaken. All help is greatly appreciated!
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Old 7th January 2012, 03:18 AM   #2
AllenB is offline AllenB  Australia
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Old 7th January 2012, 05:33 AM   #3
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Any transmission line is going to be larger than a sealed box (assumming the same number of drivers). An Alpha line uses a larger than necessary box, and lots of damping to simplify the design algorithm for these TLs.

A more optimum TL can be designed using all the tricks.

To get a smaller box you are going to have to use fewer boxes.

dave
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Old 7th January 2012, 06:08 AM   #4
jb0194 is offline jb0194  United States
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Thanks for the responses. Increased depth of the enclosure versus sealed will work in the new room.
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