Optimal volume for an LMS Ultra 5400 18"

[anyfive 10+ year member]

I'm trying to figure out of if I could make a TC Sounds LMS Ultra 5400 18" fit in my trunk and still have good results.

Would anyone be able to provide some insight on what kind of volume these like?

I have pretty easy access to one for a good deal, and I'm trying to figure out if I should pull the trigger.

Approx. max dimensions I'm working with are 40"W x 20"H x 22"D.

Any help is appreciated!

If it is feasible, I'll probably be looking for some design help, as I'm guessing aero ports would have to be used to help with size, and I'm not too comfortable with designing aeroport boxes at the moment.

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[Kangaroux 5,000+ posts]

Not familiar with what sizes those subs like but that is nearly 8.5 cubes gross after wood displacement. You have enough to do anywhere from 6-7 cubes net depending what kind of port you go with

 

[wenn_du_weinst 10+ year member]

4ft is what I would do, suspension is soft and the motor is strong as hell.

 

[anyfive 10+ year member]

Not familiar with what sizes those subs like but that is nearly 8.5 cubes gross after wood displacement. You have enough to do anywhere from 6-7 cubes net depending what kind of port you go with

Yeah, those max dimensions are like MAX dimensions, so ideally it would be a little smaller.

4ft is what I would do, suspension is soft and the motor is strong as hell.

I've seen ~4 ft^3 suggested elsewhere too (and WinISD models it right around there as well). Any idea on tuning? Trying to get as flat of a response as possible.

Can anyone comment on these from personal experience? Not just box wise but how the sound quality, output, etc was. I'm really leaning towards going this route, as long as everything works out. From everything I've read and the specs they have, they seem like **** good subs.

 

[wenn_du_weinst 10+ year member]

that would depend on your car. Just a guess for a starting point would be mid 30's

 

[anyfive 10+ year member]

that would depend on your car. Just a guess for a starting point would be mid 30's

Yeah, I was kind of just looking for a jumping off point, so I could run a few numbers through. I know to get an accurate tuning specific to my vehicle, I'm going to have to figure out the cabin gain.

Thanks for the help guys.

 

[Kangaroux 5,000+ posts]

Need to know cabin gain before you can determine what kind of tuning is needed for a flat response. I like to tune low so you have the low end response there and then if you want to make the response any flatter you can EQ it and go from there

 

[Buck 5,000+ posts]

5.5 at 32 hz.