View Full Version : More sub bass in an X2

04-16-2011, 04:47 PM
I am looking to see who has added an additional sub in an X2 and where. I have the factory jl audio sub in its stock location with a JL Audio MHD750 powering it. I know a little much. I was thinking of wiring another 10 inch free air below the steering wheel in paralell. Is the effort of cutting the hole and the added expense going to give me justifiable output?? Has anyone done this or put an additional one somewhere else. Does anyone have any photos?

04-16-2011, 09:00 PM
I agree I would like some suggestions, I have thought about adding another sub but don't know where.

04-16-2011, 09:35 PM
Now that I have an extra sub thats been repaired (see frozen sub woofer thread), the X2 could use some more bass. I would think reversing the polarity and placing it on the opposite side under one of the seats might work. Any sound experts got any ideas? Not sure if the repaired woofer will sound good yet.

04-16-2011, 10:22 PM
My X2 has two 10" subs in the ski locker in a big coffin box (thanks Skeeler) and another Memphis Audio 10" in the stock location. All are being driven by an Alpine PDX1000U?? I'm thinking about adding a fourth 10" to just round things out.

The waves move away from the boat.

04-17-2011, 12:29 AM
I have one Boston 12" with a tunable radiator in the compartment under the dash. It's either 450W or 900W (dual voice coil). it appears to handle most of what a JL E1800DM amp can throw at it. Thumps pretty good. Flo Rida kills fish!:D

04-17-2011, 01:06 AM
Free air really isn't the way to go. In my friend's 07 X2 we initially moved the factory sub into a box under the seat behind the driver's seat and put a 12" sub in a box under observer's seat. Now he is running a 15" solo baric L7 under the observer's seat instead of the 12, and has a JL audio 10w3 instead of the factory sub. I have a 15" solo baric L7 under the observer's seat in my 03 X2, and I just disconnected the factory sub since you couldn't hear it any way. You can pick up and L7 for $300 and a 1000 watt monoblock amp to power it for $300 or so as well. You would be hard pressed to find more bass for that price. It just depends on how much storage space you are willing to give up.

04-17-2011, 06:06 AM
Is that a free air or did you put a box there? Did you cut the hole there? I should have mentioned I do not want to loose space. I will post photos. Anyone else have photos. I should also mention I have a jl mhd600 powering the in boats now. 150w x4 .:D and I also have anther jl audio mhd600 posting the tower. I have 4 bullet hlcd's coming from earmark. I plan to Wake the fish. Also have a wet sounds ws420 to control it all. I can't wait to here the hlcd's. I have never heard them for real before and hope they ROCK!!!

Yellow X9
04-17-2011, 08:47 AM
I would remove the Free Air sub, and put a Sealed or ported enclosure in it's place. Simply remove the Free Air sub, re-attached the the JL Sub grill to the mounting surface, so the stock appearance is still maintained and now that opening with the Stock JL sub grill allows the enclosure that you dropped into the compartment to breath / vent the bass out of the opening

04-17-2011, 08:52 AM
Just a note: I'm sure you will look first and I don't know your X2 is set up like my X30, but all the electronics are right behind the drivers kick panel. Just be sure to look before you drill or cut into that panel is all.

04-17-2011, 10:16 AM
I think this confirms what I have always thought; the only way is to add another sub with a large enclosed box behind observer's seat. Unless you move the heater tubes you can't get a bigger sub in the stock location unless it's open air I guess. I have seen people route the heater tubes through the cup holders right there and put an enclosed box but that sounds like a bigger project.

04-17-2011, 07:50 PM
I think there is room on the passenger side walk through. Above the ridge for another 10. Thats where the amps are. Lucky for me my amps are small. I need to take a photo. Anyone put one there? I do not want to give up any space with a box. The one free air sub hits pretty hard with 750 watts hitting it. But I think 2 is better:cool:

04-17-2011, 08:40 PM
we need to see some pics if ya got em! (just sayin)

04-17-2011, 09:08 PM
In my opinion, if you are serious about adding some bass, free air subs are a joke. I have never heard a free air setup that puts out a decent amount of bass. Here are a few pics of the L7 15 under my observer's seat.

http://farm6.static.flickr.com/5026/5629153063_6ca37d589d.jpg (http://www.flickr.com/photos/[email protected]/5629153063/)
IMG_3790 (http://www.flickr.com/photos/[email protected]/5629153063/) by justin.waldon (http://www.flickr.com/people/[email protected]/), on Flickr

http://farm6.static.flickr.com/5190/5629734198_6c47b61d17.jpg (http://www.flickr.com/photos/[email protected]/5629734198/)
IMG_3789 (http://www.flickr.com/photos/[email protected]/5629734198/) by justin.waldon (http://www.flickr.com/people/[email protected]/), on Flickr

http://farm6.static.flickr.com/5265/5629733930_f62900ab27.jpg (http://www.flickr.com/photos/[email protected]/5629733930/)
IMG_3788 (http://www.flickr.com/photos/[email protected]/5629733930/) by justin.waldon (http://www.flickr.com/people/[email protected]/), on Flickr

04-17-2011, 10:20 PM
Ouch. I'm sure it's cool, and all, but the locker's a loss (and that kinda sucks).

06' X-2 R8R H8R
04-17-2011, 10:52 PM
heres where mine in on an 06 X2..Sounds great. Built in a box facing the opposite direction of the vent

04-17-2011, 11:18 PM
Nice pics, I like the drivers side idea. Using up the ski locker is not an option. ...Where will I put all the beer? LOL I mean water toys...

04-18-2011, 09:39 AM
I think this confirms what I have always thought; the only way is to add another sub with a large enclosed box behind observer's seat. Unless you move the heater tubes you can't get a bigger sub in the stock location unless it's open air I guess. I have seen people route the heater tubes through the cup holders right there and put an enclosed box but that sounds like a bigger project.

Heater tubes work out great in the cupholder area. Have to modify the slinky type to make them fit though. This 12" sub fits in front of the dash just behind the starboard bow seat.

04-18-2011, 12:27 PM
I took up my locker with a wet sounds xxx sub. it slams, I can thow a 6 inch splash off the boat sitting still in the water. I did some work with the free air sub to make it sound better but it is not close to the level of bass you can get out of a sealed box. I did mine in a ported downfire box with a 1000 watts going to the sub.


04-19-2011, 07:57 AM
There are a couple a acoustic basics to consider when adding a second sub.
Certainly doubling your surface area with a second free-air 10 can only increase the output and you definitely have power to spare with the HD750/1 and then some.
Locating the two subs side by side on the same surface will produce the best results. If not side by side then just around the corner at 90 degrees will be the next best location. The idea is to have the two subs close together and oriented in the same direction whenever possible so they couple well.
You can often install a sealed enclosure to the backside of a factory infinite baffle location/opening (provided that the heater hose cooperates) and use JL's acoustic suspension marine woofer (looks the same). The sealed version will offer a higher output and by sandwiching the boat fiberglass surface between the exposed woofer and concealed enclosure you have a factory appearance. But, don't place a true infinite baffle woofer in a small enclosure.
If possible try to avoid placing subs in non-symmterical locations or using non-symmetrical loading such as a combination of direct radiating with an enclosure radiating from within a compartment. This creates phasing conflicts, not only because of the varying distances to each listening position, but more importantly, because of the phasing differences created by the compartments and surrounding boundaries. You'll get more output but the subs don't often sum as efficiently.
If you use infinite baffle its almost always necessary that you structurally reinforce the mounting surface to the interior. Even an acoustic suspension sealed woofer wouldn't stand much of a chance of sounding good in a 5/16-inch thick or thinner box.
If you place an enclosed woofer within a storage locker its imperative that you take the steps to properly vent the compartment so that the bass radiation can freely flow from within the compartment with less obstruction. Without proper venting you can still get alot of indiscriminant sounding bass but you'll sorely miss out on the more musical components and midbass transients.
For bass in an open field boat environment, surface area generally rules. However, you can effectively increase the radiating surface area with a bass-relex enclosure. In most cases a bass-reflex 10 will edge out a sealed 12. And if you have the room and you can vent the compartment a bass-reflex 12 is even stronger.
Every boat is different and you have to take what the boat gives you. There is rarely a perfect scenerio.

Earmark Marine