New box! Pair of 18 LMS ULTRAS

[FISHKILLER 10+ year member]

Gonna try and squeeze a pair of these in the back of my ext cab truck. Built a T line for one little while ago, sounded great! Drawback was, box was huge!

I then built a 4 cubic foot sealed box. I enjoy the musicality of it but I do miss the overall output of my T line.

Decided I want more, and more power. I was powering my single with a pair of JL 1000/1 bi amping the dual 2 ohm voice coil sub.

I have since purchased a pair of DC 2k and plan on strapping to the pair of ultras.

I am leaning towards a ported box now. Thinking hard about some aeros. Finding I will most likely have a hard time fitting the diameter of aeros I will need for these subs. I need to know what size aero I should go with if I do single or pairs or three or whatever it takes for my space constraints.

Excited to build another box I have to say!

What is yalls suggestions for my Ultras on 2000 rms a piece??????? I listen to everything. Looking for the best sounding loud setup. I have about 10 cubes or so to play with.

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[hispls 5,000+ posts]

Those will displace a lot of air. I'd say you won't want to skimp on port and you'll need to tune very low to make them play flat. That in consideration the port it would take to tune that volume down low enough with adequate port area will probably not even fit in the box. My .02$ if you're not talking "wall" this isn't going to work well.

Alternately, I'm going to guess that you have deep pockets if you can afford a pair of LMS Ultras so why not spring for 3 or 4 18" passive radiators. If nobody makes them, build your own. I'd wager that if you're creative you can build them for around 80$ each. Passives will allow you to low tune and keep adequate radiating area without sacrificing your already inadequate box volume.

 

[FISHKILLER 10+ year member]

You calling my WHAT inadequate?!?! HAHA, just playing.

Def don't wanna do a wall. I still throw stuff back there, gear for MX, few groceries....

You thinking lower tuning than 30? I think I can make a larger aero fit such as two tens or so. That is kinda where I want to go. Have not researched passive radiators at all. I know what they are and basically how they work but that's where it ends. I will read up.

Pockets not deep, no sir, I fish for a living, decent pay but very hard work. I just have a few passions. This is growing back into one. Bass head since I was 16, 41 now!

Back on track, yall think 10" aeros enough or touch larger?

 

[FISHKILLER 10+ year member]

Been playing with the PSP calculator. Seems that ten inch ports are gonna be the max size I will be able to use in my space constraints given the port disp factored in. My subs have an Xmax of 33mm. Will a ten inch port be enough area for these? Be a total of two, one per sub.

I plan on firing my subs towards rear with port to the sides, up or possibly forward. Seems every time I try my subs facing forward I loose a bit of bass? Why is this when all the builds I see have them facing the front or up? Cant do up, need top of box for other things. I have four amps to mount in here also! Gonna do some rubber isolation type of things with amps on top of a heavily braced box.

 

[FISHKILLER 10+ year member]

Yet another option for me is the non traditional subs firing down. Been searching this and found some decent info. It could work well for me due to the shape of box having a deeper measurement on bottom as it follows the angle of my front seats. Anyone have any recent first hand knowledge of larger down firing subs?

I have been firing rearward, have a piece of 3/4 mdf mounted under my carpet on back wall of truck that subs load into now. Seems the best response thus far in my rig. Down firing box would be new adventure for sure, just don't know if its worth it.

Lots of questions!

 

[hispls 5,000+ posts]

Yet another option for me is the non traditional subs firing down. Been searching this and found some decent info. It could work well for me due to the shape of box having a deeper measurement on bottom as it follows the angle of my front seats. Anyone have any recent first hand knowledge of larger down firing subs?
I have been firing rearward, have a piece of 3/4 mdf mounted under my carpet on back wall of truck that subs load into now. Seems the best response thus far in my rig. Down firing box would be new adventure for sure, just don't know if its worth it.

Lots of questions!

If you're commercial fishing and not making big money you're in the wrong fleet, and there's work EVERYWHERE if you know your way around on the water and can work. Very good trade there if you don't mind busting your balls.

10" flared port per sub will probably do OK, and just going by the TC subs I've used before I'd say 30hz would be high but acceptable. You're dealing with a sub designed to play down below 20hz flat in movie sound effects in home theaters.

I've had good results down-firing subs. It's no different than loading them into a rear wall of a vehicle which also often works nicely. Keep enough clearance for the excursion and your only concern is possible suspension sag after a few years, though firing up would have the same risk. That risk is negligible considering the similar subs I've used but it's the only "downside" you'll see people discuss about down firing.

 

[treesive 10+ year member]

Could probably get the box cut down better and tuned better using pr's instead of porting. Just a thought to be looked at to see if it works for you. One drawback is cost.

 

[FISHKILLER 10+ year member]

I have yet to research PR. Gonna do that before I start box.

One thing I have done though is port my sealed box. I added four, four inch inside diameter pipes. Box volume after sub and ports is only 3.5 cubes. Ports are 34.75 inches each. This gives me a tuning of 32 hz according to PSP. I think it sounds great. Bass is extremely tight and accurate. OUtput is much better than my sealed box obviously and only lacking on my T line in the ultra lows. Overall I give it the nod over my T line because it sounds better on music to my ears.

My plan is to go for 4.5 cubes after disp of sub and port. Also gonna try to tune 2 hz lower using a ten inch port. The four inchers I used were actually four inches inside diameter, giving me a port area of 50 inches. I assume if I get my hands on a ten inch piece it will be more like 9.5 inches inside which is 70.8 inches. Hopefully this combined with the touch lower tuning will get a little of my low end output back. Don't get me wrong, lows were still great, flapping my wind shield wipers a little, and jarring my vision, was just not quite as much as my T line.

 

[FISHKILLER 10+ year member]

I have now designed my box. Gonna be 9.8 cubes after port, sub and bracing. Ports will be 9 inches inside for a 63 inch port area. Ports are roughly 32 inches long. This gives me a 30 hz tune In a box size I can live with, leaving room to mount my 4 amps on top of box with out going above my window line and still can push seats all the way back with a regular incline on the back.

In process now of deadening rest of truck including roof which needed it bad with my single 18. Will not be taking out front seats and getting that part of floor but everything else is being covered.

This weekend I plan on making my ports, and adding two runs of 3/0 to my two additional batteries in bed. Was not planning on going this far but that's part of it!

 

[hispls 5,000+ posts]

Also, why are we not seeing pictures of any of this?

 

[FISHKILLER 10+ year member]

Dude. I know right! I am one of those dudes that can do most anything. Computers..........not so much! I have never posted a pic on any forum. I am an avid MX rider and have often wanted to post a pic or vid or whatever on those forums and never have!

Just got done stripping my interior, seats carpet and headliner out of truck. Went ahead and fully deadened truck. Roof, rear wall, ext cab doors, floor. Doors are mostly done previously, will touch them up when I go in to install new mids and highs.

Tomorrow Going to rain all day. Be a great day to build my ports. Hopefully I will have some breaks in rain to start on my runs of 3/0. Already have two runs of 1/0 going to add two runs of 3/0 and two batts also. Pretty jacked!

 

[gckless 5,000+ posts]

Contact PSI for PR's. Mine have done great //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bumpasauras 10+ year member]

Just bite the bullet break out the plasma cutter and do a blow thru won't have to worry bout nuthin after that lol. I seem to remember those subs doing better in sealed?? Prolly wrong

 

[FISHKILLER 10+ year member]

Hearing ya on the blow through, threw, thru, how do you spell that?! Blow through, I believe.? My truck has very high mileage, I bought her new in 1997! Crazy. 287,xxx later and still going strong enough! SHort bed so cant do blow through due to precious cargo in the bed quite often (dirt bikes)! This is all basically just a study for me and my next truck. Gonna be a long bed of some sort and a definite blow through but still have room for stuff.

What is crazy to me is how different just closing my door sounds after dampening truck! I tried a little Press N seal, that's right. Also got a hold of two packs of dyna extreme, have to say the difference is retarded. After using the extreme then some press n seal back to back it feels like and sounds like rolling paper or something as non significant compared to the dynamat. I searched the press n seal after buying some just thought I would do my own side by side comparison. I will not purchase that again.

 

[T3mpest 10+ year member]

Well look, he's building the box I told him to build the first time months ago, small ported box using aeros Just playing with you man. Anyway, yes you NEED pics, we wanna see. Other than that are you using 2 10 inch ports or one? I'd say 1 10 inch port is NOT sufficient, especially if unflared, 2 of them would be alright. I have a 21 which has less cone area than 2 18's (although more motor force) and it can easily compress a 10inch port at high volume levels..