[saabracer23]

Hello all,


I am wanting to construct a pair of LLT sonosubs for mainly HT. When I can afford it and am out of my apartment lease they will be built with 18's. On my short list are a pair of RL-P18, IXL 18, FI Q18, audioque 18, and maelstrom X. Which of those would be best? Anywho, for now I am wanting to do this with a pair of 8 inch Tb W8-1363SA's that I have just sitting. There is an EBS design that is being used with good results, 3.5 cu ft tuned to 17hz. Would these be good for LLT designs? How big should I go and how low should I tune? Also I read the write up by Steve Callas (good read) and have a question. Is there any down fall going LLT instead of ported othe than cabinet size? Like upper extension or higher frequency output?


Any help with this would be great! FYI will be powered with EP2500 with gains down a bit.


Thanks

Dan

 

[brandonnash]

Out of your driver choices I would pick the maelstrom. It seems to be an all around good performer. It will take a pretty large enclosure for a true llt, but if you are going that route let me impose an opinion. Tune as low as you can. If you can get a 10 hz tune out of it I would do it. I tuned mine to 15 hz and have grown to almost constantly looking at excursion past that frequency.


Depending on how you do the port you may get an upper port resonance but it is usually above crossover though.


Go ahead and start making the sono now before you move. Just don't let them rip until you move or the rest of your building is not at home.


For your 8's I don't know about that tuning. Something that small will probably run into xmax in the 20's unless you are running 50 watts or less to them. Maybe go sealed or a higher tune for those.

 

[saabracer23]

Thank you for the response, I have modeled the 8s in that enclosure and with 200 watts I reach xmax at 20 hz but then drops till I hit 17 hz. It should be within xmech till 17 hz. People who have built this enclosure have said that there are no excursion problems reaching 17 cycles. I figured if there was a person with experience building LLTs that they could help with designing one. By the way this EBS design was from the parts express tech forums.


Dan

 

[brandonnash]

If you tune at 17 hz then the enclosure will help to take away some of the excursion at that frequency. You should remember that when you model with that much wattage that you actually won't be putting that much into your sub during most movies. It will just be during those loud heavy action scenes. Hpf is recommended for something like those 8's. You can probably get by without one for your 18's when you get them. I am running without one and my enclosure is 13 cubic feet and tuned to 15 hz. I don't push very hard and big scenes like from wotw so I am ok.


If you go with dual maelstroms you would want to get 2 ep2500 amps. Those drivers like power.

 

[saabracer23]

Agreed, especially in an apartment. I doubt it will ever get that loud, because as soon as I can get loud I'm going with 18s. Would there be any benefit to going larger and tuning lower? Would there be any downfall going this route as opposed to tuning higher in a smaller cabinet?


Dan

 

[brandonnash]

There is always a point of dimenishing returns. You can make a hundred cubic foot enclosure tuned to 2 or 3 hz and down to the tuning frequency it will respond like a sealed box. Its been a while since I modeled one, but I think the maelstrom looked good in a 20 or so cubic foot box tuned to 15 hz or lower.