Mach 5 IXL 18.2.2 Box opinions

13817 Views 112 Replies 12 Participants Last post by Mike P., Jun 11, 2009

sub_junkie

Discussion Starter · May 25, 2009 (Edited)

I am probably going to get the IXL 18.2.2 when they are back in stock...
But until then, I wanted to see what you guys thought about my planned box dimmensions.
It will be 7 cu.ft tuned to 17.99hz so the port lengths can be a quarter multilple like .75 or .25.

The box needs to be the same depth and width to fit in the corner of my room to clear the furniture.
Just to make sure, the 19 inch depth and width are external dimmensions and not internal, correct?

Here is the port lengths and volume:

You need to multiply the port volume 524.6459731494955 (yes, that is the actual number it has) by three due to the three 4 inch ports at 41.75 inches long to keep the tune the same.

And, here is the bracing:

You will need to multiply 54 cubic inches by 2 becuase I was thinking that 2 of those braces would be sufficient? Do you think that I will need more braces or just different dimmensions for them?

Would you guys recommend anything else for me to change? I am not sure how much bracing I would need for this box, so I am hoping someone could help me out there.
Would I need to secure the ports to the bracing? If so, should I just change the bracing number of cutouts to 2 and then just drill a hole big enough for the three 4 inch ports to fit through? Also, I would have the ports exiting through the top of the box...if I changed the cutouts to 2, I would have to change the heighth of the box to compensate for the extra volume taken up. The driver will be down firing. (I'm assuming that the driver will fit with a base plate?) The box will have 1 inch square legs with a <probably> one inch thick baseplate screwed into the legs.

I am open to any suggestions you guys have.

Thank you

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Jugix

· #101 · Jun 7, 2009

sub_junkie said:
What would make a 18" sub driver less "musical" than a 12" or 10"? Or, what would make the others be more musical over the 18" driver?

1) Define: Musical.

2) Define: Musical in 10Hz - 80Hz.

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mdrake

· #102 · Jun 7, 2009

The term musical does not really describe a subwoofer. :bigsmile: The key to a subwoofer sounding is good is being able to start and stop when asked to but many things come into play I have learned in the world of HT. The room, the amp, the box and the woofer can all make a sub driver sound good or bad. My advice is EXPERIMENT tell it hurts. :rofl:

Matt

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sub_junkie

Discussion Starter · #103 · Jun 7, 2009

OK, that's what I had originally thought.
Well, musical by what I was meaning is being able to hit double bass passes in songs like Two Weeks by All That Remains. Otherwise, I don't know how would describe it.

Thanks for the help everyone. It's been really valuable

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mdrake

· #104 · Jun 8, 2009

Ah, I think I understand what you are saying. You are talking about the subwoofer being true to it's source. Do I understand correctly? A well designed box, a good woofer, and good amp and then a good setup will get you a nice accurate sound. :bigsmile:

Matt

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robbo266317

· #105 · Jun 8, 2009

Caveat:- In the Bass realm there are always neccessary compromises. Box/driver size. Location/Room size etc....

Also, What sounds good to you, or me, is subjective.

When I started building speakera a lot of people would not build bass reflex boxes due to their experience in the 80's where ill advised attempts with poorly understood Thiele Small parameters gave inadequate results!
Speaker/Box design has come a long way since then, including a vast array of software to help model the speaker/box interactions and, unless you do something totally inappropriate, a good speaker will be Ok in allmost all of the enclosures modelled.
"Musicality", I would suggest, is not going to be a concern for a Sub... Most sub output is going to be felt and the detail is going to be in the higher frequencies which is reproduced by your main speakers.
So if your mains don't sound OK then adding a sub isn't going to help.

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sub_junkie

Discussion Starter · #106 · Jun 9, 2009

I have another WinISD question.
If you have two drivers, and the box is let's say 10 cu.ft, could you just make two 5 cu.ft boxes and have the same performance as it shows in WinISD?

Thanks

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Jugix

· #107 · Jun 9, 2009

sub_junkie said:
I have another WinISD question.
If you have two drivers, and the box is let's say 10 cu.ft, could you just make two 5 cu.ft boxes and have the same performance as it shows in WinISD?

Thanks

One big box with 2 drivers:
+ Drivers are close and are considered to be coherent. +6dB gain.
- Both drivers in same location and are affected by same room modes.

Two smaller boxes:
+ More even FR.
- Drivers are far apart and considered to be uncoherent. +3dB gain.

Feel free to correct me.

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Ricci

· #108 · Jun 9, 2009

sub_junkie said:
I have another WinISD question.
If you have two drivers, and the box is let's say 10 cu.ft, could you just make two 5 cu.ft boxes and have the same performance as it shows in WinISD?

Thanks

Having both drivers in one 10ft box versus havng each in a 5ft box is theoretically going to be the same. However there are real advantages to doing 2 boxes, such as placement flexibility, ease of movement, evening out room response, etc.

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sub_junkie

Discussion Starter · #109 · Jun 10, 2009

OK, so if I decide to get a second IXL 18.2.2, I will do two 7 cu.ft boxes.

Thanks for the help

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sub_junkie

Discussion Starter · #110 · Jun 11, 2009

I'm just trying to get a better deal here, so please don't flame me. lol. Just playing the options also...

If I bought Dgilme's two AE C12.2's, they would actually perform somewhat better than the single IXL 18. But, If I needed more than the two twelves, I would have to get them soon becuase AE only has three more in stock for $75 each. The 4 twelves would perform nearly the same as the two IXL 18's, for around $180 cheaper. Do you guys think I would need more than two twelves or one IXL 18.2.2? Only problem is I don't know if the Behringer EP2500 would be enough to power four twelves.

Thanks for the help guys, and for sticking with me on this. I will not ask another question like this again. I promise :T

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Mike P.

· #111 · Jun 11, 2009

Stick with what you have planned Dylan, The "What If" game can go on forever.

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mdrake

· #112 · Jun 11, 2009

I agree with Mike go with the 18! Trust me one 18 in large room is a lot of bass. One 18 in a bedroom is CRAZY BASS!!!!!! Get one of those used 18's and build a box. :bigsmile:

Matt

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Mike P.

· #113 · Jun 11, 2009

mdrake said:
I agree with Mike go with the 18! Trust me one 18 in large room is a lot of bass. One 18 in a bedroom is CRAZY BASS!!!!!! Get one of those used 18's and build a box. :bigsmile:

Matt

There you go Dylan, you've heard that before, remember? :whistling:

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