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MFW15 box

post #1 of 56
Thread Starter 
Any one have a cut sheet they can send me door a 3cuft box for this driver? I've seen a lot of builds but no cut sheets.
Thank you
JJ
post #2 of 56
Thread Starter 
From what i read it was a better box than the 2.5cu ft. Is that correct?

JJ
post #3 of 56
I think most people were using 3 cuft. That's basically a 19.25" cube.
post #4 of 56
Thread Starter 
I was hoping someone had a cut sheet that i could just take to Home Depot and have them cut since i don't have a table saw. Any help would be greatly appreciated.

JJ
post #5 of 56
Home Depot doesn't have the best reputation for cutting things right. Any other options?
post #6 of 56
Thread Starter 
I heard if you slip them a $20 they might do a better job. I can get a table saw but just figured since they could do it so much easier i would give them a try.

JJ
post #7 of 56
I don't know how much a sheet of mdf is, but if you're going to slip them a $20 on top of the mdf cost, you might as well buy one of the 3cuft flat packs that was made for that woofer.
post #8 of 56
Thread Starter 
I can do a table saw. Anyone have a cut list for a 3 cu ft box? This will be my first diy build. I currently have 2 HSU hrs12v subs. Would i be able to use the amps from these subs or would i need something new?

JJ
post #9 of 56
Hey jjgear, Do you have a router and bits as well? If not, I would suggest Erich's sub flat pack mentioned above. Here:http://www.diysoundgroup.com/subwoofer-flatpacks-2/3-sub-flat-pack.html Tools can add up quick and unless you're gonna built more, the flat pack option is pretty nice.

Otherwise, this is close:

Panels: Volume: 3.373 ft^3
2X 19.25x19.25 - Front baffle and rear of box.
1X 19.25x19.25 - Double baffle
2X 19.25x18.5 - Top and Bottom
2X 17.75x18.5 - Sides

Bracing: Bracing Volume: 164.25 in^3
2X 2x18.5 Top to Bottom
2X 2x18.5 Fron to Back
2X 2x17.75 Side to Side

Driver Volume: 0.2

Net Volume: 3.078 ft^3

Or roll your own in whatever size you need, here: http://www.hometheatershack.com/forums/enclosure-volume-calculator/

I'd forget about the hsu amp, there is probably an undefeatable/built in filter for that particular driver in the ported alignment it's in. You can run the single mfw driver off of one channel of a Behringer iNuke1000dsp or similar amp. You'll need a high pass filter at 20Hz to protect against overexcursion, which can be accomplished within the inuke.
post #10 of 56
Thread Starter 
Couple more questions. I purchased a flat pack from Erich( great by the way) and also purchased a inuke1000 dsp. Question i have is what is the best way to hook the subwoofer up to the amp? Should i just use a speakon connector with bare wire going to the subwoofer with some binding posts? Also i have a couple tubes of pl375 will this work or should i get the pl premium?

Thank You
JJ
post #11 of 56
Here's a free cut list program that I've been using, if you're interested.
post #12 of 56
Quote:
Originally Posted by jjgear View Post

Couple more questions. I purchased a flat pack from Erich( great by the way) and also purchased a inuke1000 dsp. Question i have is what is the best way to hook the subwoofer up to the amp? Should i just use a speakon connector with bare wire going to the subwoofer with some binding posts? Also i have a couple tubes of pl375 will this work or should i get the pl premium?

Thank You
JJ
Install a Speakon chassis mount to your subwoofer box. You need to get a wider body one for a wood mount like this one: http://www.parts-express.com/pe/showdetl.cfm?partnumber=092-054. Connect the bare wire from the driver to the Speakon receptacle. Now use a piece of speaker wire with Speakons on each end to go between the sub and the amp.

NL4MPR.jpg
post #13 of 56
Thread Starter 
Am i able to assemble the box before i have the chasis mount?
post #14 of 56
Yes. Once the box is assembled then you drill the hole where you want the Speakon jack to be located. You could even wait until after the box is painted. Since the flange is larger than other Speakon jacks, you can oversize the hole a little bit.
post #15 of 56
What about ports?

Can this woofer me ported in a 3"cu box?

I would love to add a couple to go with my captivator
post #16 of 56
Thread Starter 
Hopefully last question. I currently have 2 HSU hrs12v subs that i would like to hook up in addition to 2 of these MFW15's. How do i go about doing so? Can i just use an RCA Y adapter and then go from that to the inuke 1000dsp using a rca to xlr cable?

Thanks
JJ
post #17 of 56
Thread Starter 
How do i hook up these speakon connectors to the driver?

post #18 of 56
Quote:
Originally Posted by jjgear View Post

How do i hook up these speakon connectors to the driver?


On the inside (back) of the connector will be four tabs or screw inserts (I can't remember which that model has). You will use 1 & 2 (they are labelled by polarity).
post #19 of 56
Quote:
Originally Posted by zora View Post

On the inside (back) of the connector will be four tabs or screw inserts (I can't remember which that model has). You will use 1 & 2 (they are labelled by polarity).

Double-check which terminals to use. I thinks its 1- and 1+ unless you are bridging. The back of the amp and the jack are both well marked.

Here's a pic I just took of the back of an iNuke and the back of one of those connectors:
post #20 of 56
Quote:
Originally Posted by jjgear View Post

Hopefully last question. I currently have 2 HSU hrs12v subs that i would like to hook up in addition to 2 of these MFW15's. How do i go about doing so? Can i just use an RCA Y adapter and then go from that to the inuke 1000dsp using a rca to xlr cable?

Thanks
JJ

Yes, however each time you split the signal your reduce available voltage by 50%. Make sure you have enough pre-out voltage for the number of splits you intend to use.

Quote:
Originally Posted by goonstopher View Post

What about ports?

Can this woofer me ported in a 3"cu box?

I would love to add a couple to go with my captivator

Yes. Any box can be ported. However IMO you need a bigger box to tune low enough. You would be giving up a considerable amount of box volume to port volume to even tune to something resonable like ~20Hz. IMO going up to 3.5 would work better at least.
post #21 of 56
Quote:
Originally Posted by NicksHitachi View Post

Yes, however each time you split the signal your reduce available voltage by 50%.
Parallel loads all receive the same voltage.
post #22 of 56
^Good point assuming pre out not current limited IDK the R of an input circuit maybe negligible........

Edit: parallel circuit = half impedance so yes, gotcha.
post #23 of 56
Thread Starter 
Got 1 all put together running off 1 channel of the inuke 1000dsp. It just doesn't seem to have the slam i thought it would. Is there something in the amp that i need to change or setup?

Thanks
JJ
post #24 of 56
Quote:
Originally Posted by desertdome View Post

Install a Speakon chassis mount to your subwoofer box. You need to get a wider body one for a wood mount like this one: http://www.parts-express.com/pe/showdetl.cfm?partnumber=092-054. Connect the bare wire from the driver to the Speakon receptacle. Now use a piece of speaker wire with Speakons on each end to go between the sub and the amp.

NL4MPR.jpg

So that is a 4 pole. Does it require a 4 pole speakon connector or does the two wire fit this as well (1+/1-)?
post #25 of 56
Thread Starter 
post #26 of 56
Quote:
Originally Posted by pauleyc View Post

So that is a 4 pole. Does it require a 4 pole speakon connector or does the two wire fit this as well (1+/1-)?

You can use a NL2FC plug in a NL4 jack (including the NL4MPR), according to this page:
http://www.audiopile.net/products/Adaptors_Connectors/NEUTRIK/NL2_Speakon/NL2FC_cutsheet.shtml

It says "Pins 1 positive and negative", so yes, 1+/1-.

I'm not sure if that's true of all NL2 plugs, but it seems like it might be.

-Max
post #27 of 56
Thread Starter 
Help me find the output i'm looking for.

JJ
post #28 of 56
All the standard advice applies -- room placement, calibration, EQ, is the signal level sufficient, maybe you need more subs for the output you seek, etc.

-Max
post #29 of 56
Thread Starter 
What are my best options for sub eq? I currently have a pioneer receiver and would like to keep it.
post #30 of 56
Quote:
Originally Posted by jjgear View Post

Got 1 all put together running off 1 channel of the inuke 1000dsp. It just doesn't seem to have the slam i thought it would. Is there something in the amp that i need to change or setup?

Thanks
JJ

Whats wrong with the EQ/DSP in the amp?
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