[mlundy57]

I'm thinking about initially using dual non servo 8" subs for the sub towers since I already have some of the X-sub drivers and 300w (into 4 ohms) plate amps. 

Can these drivers be used in an OB "H" frame or should they be in a ported box?

If in a ported box, can the port be on the top like the X-Sub or does it need to be on the bottom?

This is what I'm thinking of if the ported box is the way to go. This is my first attempt using Sketchup so the drawings are rather crude.

Overall dimensions are 12"W x 27"H x 16.5"D       According to WinISD, the internal volume needs to be 1.625 cubic feet. The vent is 2.5" x 15" x 47.5"      This puts the port tuning at 29Hz






Will this work with these drivers?

[oz_audio_todd]

Im not sure if this is important or useful (and I get it, that some ppl do love the OB), but what would/ could/ should/ might you do with that MMTMM if you were going to run them in a sealed or ported box? While im sure you could you run them as is, in a ported box (and get to 80Hz or so), what would you do as a 3 way?

[Danny Richie]

Mike,

If you are talking about the 8" servo subs then I'd go with seal the box over a ported one.  And Rythmik has a version for sealed boxes. But I'd brace them really heavy just like some of the designs for our 12" servo subs.

[cnm_mike]

Is a setup like an OB5 or OB7 possible?

[mlundy57]

Mike,

If you are talking about the 8" servo subs then I'd go with seal the box over a ported one.  And Rythmik has a version for sealed boxes. But I'd brace them really heavy just like some of the designs for our 12" servo subs.

Danny,

These are the 8" non-servo drivers I got from you awhile back for the X-Sub, the AV123 RS-1000 drivers. I don't think these drivers would work in a H frame that's why the ported box.

This ported box is basically an X-Sub that is taller, wider and deeper so that both drivers are front firing and fit in one enclosure that is sized to work as a stand for the MMTMM section.

The port was also resized to work in this box and still keep the tuning close to 28Hz.

My ultimate goal is to use servo 8's in an H frame.

[Danny Richie]

Danny,

These are the 8" non-servo drivers I got from you awhile back for the X-Sub, the AV123 RS-1000 drivers. I don't think these drivers would work in a H frame that's why the ported box.

This ported box is basically an X-Sub that is taller, wider and deeper so that both drivers are front firing and fit in one enclosure that is sized to work as a stand for the MMTMM section.

The port was also resized to work in this box and still keep the tuning close to 28Hz.

My ultimate goal is to use servo 8's in an H frame.

Oh, those woofers need a ported box. Add a few braces and you got it with those drivers.

[Danny Richie]

Is a setup like an OB5 or OB7 possible?

Yes.

[mlundy57]

Oh, those woofers need a ported box. Add a few braces and you got it with those drivers.

Thanks. Where would you put the braces? I can think of one between the drivers but what about the other braces?

[Captainhemo]

Are the amps now available for the 8" servo subs ?   I didn't realize the main supply of them   had arrived, I know there are some out there but thought those were just the ones Brian had air freighted over...

Is there an adjustment made   for  OB use like the A370 ?

-jay

[Danny Richie]

Are the amps now available for the 8" servo subs ?   I didn't realize the main supply of them   had arrived, I know there are some out there but thought those were just the ones Brian had air freighted over...

Is there an adjustment made   for  OB use like the A370 ?

-jay

Yes, the new amps for the 8" servo subs are in stock. I think Brain adds a shelving circuit to the ones being used in OB applications.

[Danny Richie]

Thanks. Where would you put the braces? I can think of one between the drivers but what about the other braces?

Just be sure to break up those large panel areas into smaller ones.

[mlundy57]

Just be sure to break up those large panel areas into smaller ones.

Would one brace behind each woofer like you use on the N3 & X-CS Encore work? Here's the mock up:





The first brace would be centered 4.250" from the bottom and the second brace would be centered 8.750" above the first.  There would then be 4.50" above the second brace to the first port panel.

Also, is 3/4" thick enough for the front baffle with two of these drivers or should I double it to 1.5"?

Thanks,

Mike

[Danny Richie]

Would one brace behind each woofer like you use on the N3 & X-CS Encore work?

And one between them.

Then you need to add some bracing to that wall on the left (in the drawing).

And I think 3/4" will be fine if you surface mount the drivers. If you countersink them to make them flush with the baffle then it needs to be a little thicker.

[mlundy57]

And one between them.

Then you need to add some bracing to that wall on the left (in the drawing).

And I think 3/4" will be fine if you surface mount the drivers. If you countersink them to make them flush with the baffle then it needs to be a little thicker.

How does this look?






Mike

[S Clark]

How does this look?






Mike

OK, I'm confused.  Is this intended to be a servo driven transmission line?

[Danny Richie]

Looks really good. Now you just have the un-braced top and bottom panel to go.

[mlundy57]

OK, I'm confused.  Is this intended to be a servo driven transmission line?

No, this is a ported box for two non-servo 8" drivers which were originally designed for the X-Sub. I have extrapolated the X-Sub design to house two front firing drivers instead of one down firing driver. Ii is also being designed to work as a stand under the MMTMM OB sections.

I realize it will not work as well as OB servo 8's in an H frame would with the OB MMTMM section, but since I already have the non-servo 8" drivers and plate amps it will be more cost effective to start with the non-servo drivers in a ported box then move up to OB servo 8's later on.

Part of the confusion may be because I have left the second side off the drawing to show the internal bracing and port.

Mike

[mlundy57]

Looks really good. Now you just have the un-braced top and bottom panel to go.

Danny,

Wouldn't the second side (not shown in the drawings for clarity) add enough bracing for the top and bottom?

If not, would you recommend angle braces from the sides to the bottom like on the N1X or would some type of U shaped brace be better?

I plan on using triangle shaped pieces in the corners of the port dividers like in the X-Sub, though I think those are mainly for guiding the air flow than for supports. It seems that any other type of bracing I could use for the top panel would interfere with the port.

I'm open to suggestions

Mike

[Danny Richie]

You need to brace these panels.

[mlundy57]

You need to brace these panels.

I understand which panels you are talking about, I just don't know how to do it. Especially the top panel. Anything I put in as a brace will interfere with air flow through the port and reduce the port volume. There will be another side attached to close the box but apparently you mean more bracing than what that additional side will provide.