Mtx Sub Enclosure Ideas

Hello everyone! I am a newbie and have been using the search button alot lately. I finally joined to learn and share ideas with everyone. I just ordered 8 mtx thunder 5500 10's(single 4ohm) subs. I will be building an enclosure this week. I am leanning tward a bandpass enclosure. The reason for this is that I had one back in 1998 and it was unbelieveable! That specific enclosure played very hard across the board. I spent 2 hours with mtx's tech the other day and he suggested that I build a 6th order enclosure. We played with numbers and ports for quite some time. Now I have never built a 6th order enclosure  but have built many successful 4th order enclosures. THey do take alot of time  and knowledge to build. THats not an issure here. Here are some of the numbers we came up with....

Low frequency chamber

vent- 45"x2"x25"(deep) 90sq" port area

9cuft total air space with woofer and port displacement

this chamber is tuned @ 32hz

High frequency chamber

vent 45"x4"x7"(deep)

8 total cuft with woofer/port displacement

this chamber will be tuned @70hz

 The tech said that the woofer will play @25hz but he recommends not for a long time. Here are a few more specs....

@25hz will have +4db gain

@33hz will be a 6.75 db gain

@48hz will be a 9db gain

@74hz will be a 10db gain

THe tech also stated that between 40hz and 60hz the average gain will be about 9.25db.  I mainly listen to hiphop but I alos listen to 80's,soft rock,and metal. I am looking for a seriously loud sound. My current setup is a 02' denali with 8 sony explode 10's. I have them in a 1.25cuft ported enclosure. It hits very hard but doesnt seem to like the lower frequencies. I know that they are a entry level sub but they do get with the program. People are amazed how well they perform for a "cheap" sub. I am moving up to mtx woofers and hopefully can pull some good numbers with them. My current is in check by the way. I will be feeding each new sub with 300w rms. I have an alternator upgrade,multiple grounds(8 to be exact), dual 1/0 power cable and 2 optima yellow tops.  So I am looking for ideas and opinions on the enclosure. I am open to anything so feel free to post up.

I am also kicking the idea around on a ported enclosure but havent convinced myself yet. Let me know what you guys think. Oh and buy the way, space isnt an issue. I am working with 20 cuft;)

Thanks,Michael 

I do have a line driver that I can play with.  Would a ported enclosure be a better chaoice? What abput a 4th order enclosure? Would that be a better enclosure than the 6th order?

I forgot to ask what kind of 6th order BP the tech told you to build. There are atleast 6 different variations of a 6th order BP to go with.

Both chambers will be ported.  basically the same as 4th order ...

here is a pic..  [IMG]https://www.the12volt.com/caraudio/images/quasisixbandpass_.gif[/IMG]

Ok try this link

https://www.the12volt.com/caraudio/images/quasisixbandpass_.gif

My question to you is this:  do you want it to sound okay as a daily driver, but still be competitive in SPL?

I think this box would give you the competitive side but not the daily driver side.  In other words, forget about listing types of music you like to listen to.  If you want to be able to adjust it so that you can use it for music, quit trying for max db's and let the tech know what your interests are.

that sounds logical. I told him to pretty much design something that he would run and he came up with a 10cuft ported enclosure. it has a f3@13hz with a 60sq inch port.I think this enclosure will do well. How does it look to you guys??

20hz-57hz

@60hz there is a 4.5 db gain

@70hz this a 3 db gain

@90hz there is a 2 db gain

If this enclosure truly has an F3 of 13 Hz, then you will have exceeded all my expectations of 10" subs.

I took a quick look at this MTX driver in WinISD pro.  This driver has an EBP of 44 and so is best suited for a sealed box, for sound quality.  You can extend the low end response a bit by porting at the expense of some peakiness in the response.  The port, at 60 square inches, would have to be about 34 inches long to achieve the response shown here, tuned at 20 Hz.  Gray line is vented in 10 cu ft net (add the port displacement)...and the yellow line is also 10 cu ft net.

If it were for me, I would use the sealed.

mtx_t5510-04.jpg

killer sonata, you found it to be wrong because you made mistakes using it.  Being a free program doesn't make it more prone to error than if you had to pay for it.  You sound like some people I had to be on a jury with.  They had that same close-minded attitude about "questioning authority". 

What are these "generic specs" you are talking about?  Does this guy who works for MTX have the actual subwoofers in question and is testing each one of them?  No, he's not.  I linked the published specs, and those can be used to the same degree of accuracy that the online "tech" used...whatever software you want to use.  Find an F3 of 13 Hz...it doesn't matter to me how much you want to pay for the program; it won't get there.  At least not with a 10 cu ft box, and not much lower at all with a 20 cu ft box.  You'll realistically get 35 to 40 Hz F3 like I showed above.  And the bandpass idea was pure stupid wasted time considering it's for an end user who desires to listen to music.

I gave the OP some help that took me time to research.  He came to this forum asking for other opinions.  You are out of line to question it unless you do at least an equal amount of research yourself and come up with something different.  Use a program you paid for...whatever you want.  If you don't have anything more substantial to offer than that, don't minimize my efforts in helping the OP build a suitable box.