MartySub FAQ - Page 139 - AVS Forum | Home Theater Discussions And Reviews
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post #4141 of 5029 Old 07-28-2017, 09:43 PM
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Originally Posted by Dcal215 View Post
Hi guys, I am thinking about building two mini Marty's with the UM 18 powered by a inuke6000 DSP. These would replace my pair of Psa xv15se's( which I love by the way). I am looking to get a little more headroom and maybe a bit more extension. Could anybody tell me if this would be a good route to go, or what I may experience with the swap? Thanks in advance for the info I appreciate it.
That would be a nice step up. You would get more output across most of the FR. Just a guesstimate you would increase output from around 60hz down and increase as you go lower to around 4-5dB+ down lower from say 25hz and below. That is a just a guess as PSA subs are usually pretty efficient up top so you probably wouldn't gain much there. And this is going by when Marc Alexander tested the sealed PSA 3000i vs Seatons F18 I am just basing the top end output off those #s.

So basically on the lower end, it would be like adding 2 more XV15se. 2 Um18=4XV15

On second thought it might crush the PSA across the whole FR. Looking data bass and the older XV15 vs the UM18. But then you can't really go by that as you will not get those kinds of # out of the Um18 with the Inuke. That amp Ricci used was 3-4x more power to get those higher up #s.

But for giggles here is the sealed Um18 vs the XV15. And add 6-8db for a ported Um18 down lower.
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HTPC, Sony 40es, 120" Silver Ticket, 7702mkii, Sunfire Amp 225w, JBL 590, JBL 520

PSA XS30, Seaton Submersive, 2 Um-18 8cf sealed, Outlaw Ultra x 12, Kappa Pro 18LF, BFM Tuba 60 horn, B&C 18TBW100 6cf 41hz, 34hz, 28hz tune

iNuke 3000 & 6000 DSP's, Crowson Motion Actuator

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post #4142 of 5029 Old 07-28-2017, 10:58 PM
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Originally Posted by STAIN0 View Post
About to build my 2x minimartys, in australia our mdf sheets are 2400x1200 so i have modified my cutlist to suit.

Would somebody please tell me if this size will be ok? i8 have kept the ports the same size, but the cab is a bit smaller.\



*Edit...



Will gladly share my cutlist and nested layout also. 3x 2400x1200 and 1x 1200x600 sheets for 2x minimarty's as per attached diagram.


I'm not sure how accurate the port tuning comes out on a lot of these "Marty" builds anyway, but yes an air volume change will affect your port tuning, you can easily model this in WinISD and make adjustments, ultimately the only way to know your port tuning is to measure it using Data or WT3.

Another thing to consider is making panels bigger but gluing smaller sheets together, with good gluing and a few dowels this will be more than strong enough and then you don't have to sacrifice enclosure size.

HTH,
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post #4143 of 5029 Old 07-28-2017, 11:01 PM
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Quote:
Originally Posted by Dcal215 View Post
Hi guys, I am thinking about building two mini Marty's with the UM 18 powered by a inuke6000 DSP. These would replace my pair of Psa xv15se's( which I love by the way). I am looking to get a little more headroom and maybe a bit more extension. Could anybody tell me if this would be a good route to go, or what I may experience with the swap? Thanks in advance for the info I appreciate it.

not sure how much more headroom you will pick up over about 40hz--probably fairly close. where the um18/marty will begin to pull away is from 30hz down (bigger cab, lower tune, bigger driver, bigger port, more excursion, etc.). on the very low end, extension will be about 4hz lower and output will be 4-5db or so greater. those very low notes are tough. if you are looking for more midbass "punch", it might not be the best swap.
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post #4144 of 5029 Old 07-29-2017, 06:54 AM
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Originally Posted by LTD02 View Post
not sure how much more headroom you will pick up over about 40hz--probably fairly close. where the um18/marty will begin to pull away is from 30hz down (bigger cab, lower tune, bigger driver, bigger port, more excursion, etc.). on the very low end, extension will be about 4hz lower and output will be 4-5db or so greater. those very low notes are tough. if you are looking for more midbass "punch", it might not be the best swap.
Thank you and Bscool, that is the information I was looking for I really appreciate it.
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post #4145 of 5029 Old 08-01-2017, 07:39 AM
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Hi AVS experts,
Can someone models the micro box to a rectangle instead of square or point me to the right directions - what program to use? I have two of the old SI HT 15" D4 that I would like to build them as down firing and place them near field next to the seat.

Much appreciated the help!
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post #4146 of 5029 Old 08-06-2017, 01:37 PM
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Originally Posted by gk14 View Post
Hi AVS experts,
Can someone models the micro box to a rectangle instead of square or point me to the right directions - what program to use? I have two of the old SI HT 15" D4 that I would like to build them as down firing and place them near field next to the seat.

Much appreciated the help!


You never mentioned what size rectangle you were looking for. I have an end table that is 21 wide x 24 deep x 26 high (the top overhangs 1-1/4" all around, so the top is 23-1/2" x 26-1/2").

Using those dimensions, and allowing 4" clearance for the down firing driver and 3/4" for an overhanging top, a down firing box would measure 21 wide x 24 deep x 21.25 high, with 4" legs.

That box equates to a Marty type that is 24" high by 21" wide by 21.25" deep (just add legs on the baffle side and lay it over, then add the top).





Parts and braces use 1 sheet of MDF. Table top will require an additional piece.


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post #4147 of 5029 Old 08-06-2017, 07:30 PM
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Thank you, Auger. Really appreciated the help!
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post #4148 of 5029 Old 08-07-2017, 01:11 AM
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Thank you, Auger. Really appreciated the help!

YW

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post #4149 of 5029 Old 08-07-2017, 08:05 PM
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Originally Posted by Augerhandle View Post
YW
I used the box size that you gave me and I played around to see what size of a rectangle box will fit on the corner, and below is what I came up with. Can you double check to see if the box size is okay.

Thanks!!
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post #4150 of 5029 Old 08-08-2017, 03:19 AM
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Originally Posted by gk14 View Post
I used the box size that you gave me and I played around to see what size of a rectangle box will fit on the corner, and below is what I came up with. Can you double check to see if the box size is okay.

Thanks!!

I forgot to adjust the port height because of the reduced width, in order to maintain a similar port area. Plug in 1-7/8" (1.875) for the port height and you should be good to go.

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post #4151 of 5029 Old 08-08-2017, 05:30 AM
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Originally Posted by Augerhandle View Post
I forgot to adjust the port height because of the reduced width, in order to maintain a similar port area. Plug in 1-7/8" (1.875) for the port height and you should be good to go.
Got it. Thank you!
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post #4152 of 5029 Old 08-15-2017, 08:59 PM
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Originally Posted by Augerhandle View Post
I forgot to adjust the port height because of the reduced width, in order to maintain a similar port area. Plug in 1-7/8" (1.875) for the port height and you should be good to go.
Is the graphic in post #4147 a utility that can be used to "organize/plan" non-standard sizes? I have to build two Marty's as big as I can fit in the two identical places I have for them. The size that I can fit is 24"W x 17D x up to 53"H. I think that results in roughly the volume of the MiniMarty; around 9 cu ft. With the typical 18" subs (although likely the Ultramax) and an iNUKE6000DSP, I should be fine.


I am not knowledgeable enough to know what the dimension of the port should be with this custom size. ??


I'd appreciate direction to this utility, if it's available. Thanks.
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post #4153 of 5029 Old 08-16-2017, 02:30 AM
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Originally Posted by Cam Man View Post
Is the graphic in post #4147 a utility that can be used to "organize/plan" non-standard sizes? I have to build two Marty's as big as I can fit in the two identical places I have for them. The size that I can fit is 24"W x 17D x up to 53"H. I think that results in roughly the volume of the MiniMarty; around 9 cu ft. With the typical 18" subs (although likely the Ultramax) and an iNUKE6000DSP, I should be fine.


I am not knowledgeable enough to know what the dimension of the port should be with this custom size. ??


I'd appreciate direction to this utility, if it's available. Thanks.

It is an Excel spreadsheet https://www.avsforum.com/forum/155-di...l#post36379818


As long as you have the same port area, the length will be the same for that tune. Take the Mini Marty port width (cabinet width minus side walls and port rail thicknesses, or 22.5") multiplied by the port height (3") to get the area (67.5"²), then divide by your box's width (minus side walls and port rail thicknesses, or 21") to get the new port height (about 3.25"). Plug that number into the spreadsheet.


Your box needs to be 62" tall to match the volume of the Mini Marty. At 53" tall, it has a net volume of 7.71 cu. ft., which is closer to https://www.avsforum.com/forum/155-di...l#post26839273
With your box dimensions, a port 2-5/8" tall would match the area of the Johnny sub's port.






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post #4154 of 5029 Old 08-20-2017, 04:56 PM
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I just finished a pair of MiniMartys and was running them through some frequency sweeps and I have cabinet rattle between 110 and 140Hz on both of them. I think it's my cables inside though as I can run a sine wave and tip them back and it goes away. They were sitting upright when I did this, but they are going to be on their sides when they get to where they are going. I guess I'll see if I have to pull the drivers and do some cable management when they get on their sides.
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Hello,

Someone may have asked before but I can't seem to find it. Does someone have the text file for a full marty I can load with the cut layout program? I plan on starting a build tomorrow and would appreciate it!
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post #4156 of 5029 Old 08-22-2017, 02:10 AM
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Originally Posted by dangerdan92 View Post
Hello,

Someone may have asked before but I can't seem to find it. Does someone have the text file for a full marty I can load with the cut layout program? I plan on starting a build tomorrow and would appreciate it!

Here
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post #4157 of 5029 Old 08-22-2017, 05:51 AM
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Originally Posted by Augerhandle View Post
Here
Thank you!

Does anyone remember back when the radioshack microphone, feedback destroyer, and REW were still a thing? Will that same microphone work for the NU6000DSP?
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post #4158 of 5029 Old 08-22-2017, 06:05 AM
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Originally Posted by Witchboard View Post
I just finished a pair of MiniMartys and was running them through some frequency sweeps and I have cabinet rattle between 110 and 140Hz on both of them. I think it's my cables inside though as I can run a sine wave and tip them back and it goes away. They were sitting upright when I did this, but they are going to be on their sides when they get to where they are going. I guess I'll see if I have to pull the drivers and do some cable management when they get on their sides.
The only way to tell is to pull the drivers and check. While your in there, check your braces.
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post #4159 of 5029 Old 08-22-2017, 06:11 AM
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This may be an odd question, but how much air does your mini/full marty move at the port? I have spent most of my audio days doing car audio and have always experienced a lot of air movement.

I recently bought a pair of mini-marty cabinets with UM18's. Powering with an iNuke6000DSP. Even at high excursion levels, there is very little air moving at the ports. Is this a function of the enclosure being designed to keep the air speed down in the port? Trying to wrap my head around it.
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post #4160 of 5029 Old 08-22-2017, 10:26 AM
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Originally Posted by filtor1 View Post
The only way to tell is to pull the drivers and check. While your in there, check your braces.
I wouldn't think it's my bracing. It's PL glued and brad nailed to both the cabinet and themselves. I'll double check though. Do most people zip tie the cables to the bracing or do they use another method of cable management? My cables were pretty long. Probably several feet longer than they needed to be but I wanted to make sure I had plenty of slack when installing and if needed removing the speakers in the future.
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post #4161 of 5029 Old 08-22-2017, 01:21 PM
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Originally Posted by dangerdan92 View Post
Thank you!

Does anyone remember back when the radioshack microphone, feedback destroyer, and REW were still a thing? Will that same microphone work for the NU6000DSP?
Be nice, I still have my FBD.. lol

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post #4162 of 5029 Old 08-22-2017, 06:53 PM
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Okay, I pulled one of the subs and will reroute the cabling and flip the driver 180 degrees where it should only come in contact with one brace. I think I'll zip tie the cable to the brace with some padding in between and see if it eliminates the noise. The braces appear secure to me. I can tug on them and they aren't budging.

Change in plan. I just cut one of the cords to half length, just barely long enough for the driver to sit on the face and buttoned it back up. It's definitely the cables. I went to my other sub and shook it back and forth and could hear the cable knocking against the braces. The one I cut sounds dead, so I'll cut the other cord and run the sweeps again to verify it's resolved.
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post #4163 of 5029 Old 08-23-2017, 06:04 AM
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Be nice, I still have my FBD.. lol
Hey don't be ashamed! That thing was awesome and automatic.
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post #4164 of 5029 Old 08-24-2017, 01:39 PM
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Hi guys , I been tempting to build a Mini-marty during the last few weeks and I have a doubt regarding the port... Should I build the corner using an L shape like the red line or should I smooth it like the blue line? Thanks.


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post #4165 of 5029 Old 08-24-2017, 03:26 PM
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Hi guys , I been tempting to build a Mini-marty during the last few weeks and I have a doubt regarding the port... Should I build the corner using an L shape like the red line or should I smooth it like the blue line? Thanks.


I would just keep it simple. Use the 90 degree port. All of mine are built this way, as it is the original design provided to us in this thread.
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post #4166 of 5029 Old 08-24-2017, 06:15 PM
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Originally Posted by filtor1 View Post
This may be an odd question, but how much air does your mini/full marty move at the port? I have spent most of my audio days doing car audio and have always experienced a lot of air movement.

I recently bought a pair of mini-marty cabinets with UM18's. Powering with an iNuke6000DSP. Even at high excursion levels, there is very little air moving at the ports. Is this a function of the enclosure being designed to keep the air speed down in the port? Trying to wrap my head around it.
Yes, the design provides sufficient port area to keep velocity under control.
When driven hard at the tuning frequency however the ports will still move plenty of air.
There are two conditions I can think of that would severely limit port output:
1) You are not playing frequencies near tune. (Most music has little content in the 20 Hz range.)
2) You have activated the high pass on your iNuke at or above the tune frequency.

I remember in the beginning of the Marty thread there was some discussion around the slot port design producing a lower tune than calculated. If built to the original spec, it is possible that your cabinets are tuned lower than you think.
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post #4167 of 5029 Old 08-24-2017, 07:11 PM
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Yes, the design provides sufficient port area to keep velocity under control.
When driven hard at the tuning frequency however the ports will still move plenty of air.
There are two conditions I can think of that would severely limit port output:
1) You are not playing frequencies near tune. (Most music has little content in the 20 Hz range.)
2) You have activated the high pass on your iNuke at or above the tune frequency.

I remember in the beginning of the Marty thread there was some discussion around the slot port design producing a lower tune than calculated. If built to the original spec, it is possible that your cabinets are tuned lower than you think.
I didn't build these enclosures, so I think it may be prudent to take the drivers out and measure the ports. Also going to get out a disc that has test tones in this range and see if that effects how much air is moving. The music I was playing was in the mid 20's.

I used the guidelines for setting up here: https://www.avsforum.com/forum/155-di...z-dcx2496.html I will go through it again and make sure those setting are entered correctly though.
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post #4168 of 5029 Old 08-25-2017, 04:57 AM
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Quote:
Originally Posted by filtor1 View Post
I didn't build these enclosures, so I think it may be prudent to take the drivers out and measure the ports. Also going to get out a disc that has test tones in this range and see if that effects how much air is moving. The music I was playing was in the mid 20's.
You would be better off using sine waves to determine this.
At the port tuning frequency driver movement is greatly reduced.
Deactivate the hi-pass on your 6000.
Play pure sine waves starting at 20 Hz.
Keep dropping by 1 Hz at a time to find the point where your driver is moving the least.

The designed tuning frequency for the mini was 18 Hz and if the port end correction was not taken into consideration you might actually be at 17 or even 16.
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post #4169 of 5029 Old 08-25-2017, 11:01 AM
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Hi, what do you think of the performance of a MiniMarty against a Captivator 1400? MiniMarty using a Dayton Ultimax 18 (UM18-22) driven by an Inuke 6000DSP. Can I expect less/similar/better performance?

My room is a dedicated 2400cf sealed used 99% of the times for movies. Right now I have a PSA V1801 and cant decide if order another V1801, build 2 MiniMartys or buy a captivator. Any input or advice is much appreciated.
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post #4170 of 5029 Old 08-25-2017, 01:19 PM
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Hi, what do you think of the performance of a MiniMarty against a Captivator 1400? MiniMarty using a Dayton Ultimax 18 (UM18-22) driven by an Inuke 6000DSP. Can I expect less/similar/better performance?

My room is a dedicated 2400cf sealed used 99% of the times for movies. Right now I have a PSA V1801 and cant decide if order another V1801, build 2 MiniMartys or buy a captivator. Any input or advice is much appreciated.
I would say that a ported um18 and JTR 1400 will be pretty close in output. The sealed UM18 is down about 9dB at 16hz and you will gain that 9db going with a ported enclosure. So they would be very close.
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HTPC, Sony 40es, 120" Silver Ticket, 7702mkii, Sunfire Amp 225w, JBL 590, JBL 520

PSA XS30, Seaton Submersive, 2 Um-18 8cf sealed, Outlaw Ultra x 12, Kappa Pro 18LF, BFM Tuba 60 horn, B&C 18TBW100 6cf 41hz, 34hz, 28hz tune

iNuke 3000 & 6000 DSP's, Crowson Motion Actuator
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