Living Room " Micro-Cube " - AVS | Home Theater Discussions And Reviews
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post #1 of 514 Old 06-17-2014, 04:22 PM - Thread Starter
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Living Room " Micro-Cube "

Hey folks,
I see some people asking for a subwoofer for their living room where they don't have a lot of space. The Martycube is just too big yet they want better performance in 20 to 50hz range. I asked Ltd02 about using a 15" driver in a 21" cube.

http://www.parts-express.com/dayton-...4-ohm--295-469

With the smaller size in a ported box comes a higher tuning. The tuning for this design is 23hz. Here is the graph of the 3.5 net cuft micro-cube vs a 4 ft sealed with 15" Dayton driver above and 800 watts


Green is micro-cube. 800 watts gets driver to xmax and you can use a inuke1000dsp to power it. Here is three other drivers in comparison to the Dayton

HereDayton 390HO - red
Titanic TS400D - blue
Alpine SWR15 - green
And Eminence LAB15 - black



kind of tough to see all of them because red, green, and black all produce about the same response below 40hz (of course max spl will vary based on usable xmax). same 3.5 cubic feet, 23hz tuning, 1100 watts.

sketchup plans

So a small sub that can be cut from one sheet of MDF , that would best a hsu vtf15 for this cost
Driver. $150
Amp. $200
Wood/cables. $50

400 bucks  and your in business. Even with tuning at 23hz it gives usuable bass down to 18hz and it crushes the sealed sub in 20 to 50hz zone. For music it would be perfect with little bass below 25hz. Now don't worry I'm not swapping out my minimartys for micro-cubes. But for those on a budget and limited space , I think this is a pretty good option. I hope there is someone out their who this can help.

Here is a martysub comparison
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Last edited by chalugadp; 06-27-2014 at 08:07 PM.
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post #2 of 514 Old 06-17-2014, 04:55 PM
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More great info. It's nice for people to have different options.
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post #3 of 514 Old 06-17-2014, 04:56 PM
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what's the area of the port opening and how long is the port?

If it's not a BIG screen, it's not a theater...
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post #4 of 514 Old 06-17-2014, 05:10 PM
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just saw the thread.


this design is a great idea. tuning a hair lower to around 23hz is probably what i would suggest. just like Donny drew it up, but extending the port to a total length of around 24-25 inches as measured right down the center of the port.


like most all the ported designs, this one is a little larger than what the driver can work in sealed, but in return there is about 10db more spl around the tuning frequency. 10db is ten times the output!


800 watts or so of power and the driver remains within xmax (with protective high pass filter) and port velocity should be fine.


very cool!

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post #5 of 514 Old 06-17-2014, 05:12 PM - Thread Starter
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Quote:
Originally Posted by Jon S View Post
what's the area of the port opening and how long is the port?
1.5" high by 25" long.
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post #6 of 514 Old 06-17-2014, 05:19 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
just saw the thread.


this design is a great idea. tuning a hair lower to around 23hz is probably what i would suggest. just like Donny drew it up, but extending the port to a total length of around 24-25 inches as measured right down the center of the port.


like most all the ported designs, this one is a little larger than what the driver can work in sealed, but in return there is about 10db more spl around the tuning frequency. 10db is ten times the output!


800 watts or so of power and the driver remains within xmax (with protective high pass filter) and port velocity should be fine.


very cool!
I adjusted the plans to 23hz tuning and 25" port length. I might build one of these for a side table beside my couch. Near bass as well.
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post #7 of 514 Old 06-17-2014, 05:19 PM
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Looks like the performance of a PSA XV15se for 1/2 the cost!!
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post #8 of 514 Old 06-17-2014, 05:21 PM - Thread Starter
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Just wanted a smaller option for people who want some good bass but aren't looking to rip apart their walls
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post #9 of 514 Old 06-17-2014, 05:24 PM
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Quote:
Originally Posted by chalugadp View Post
Just wanted a smaller option for people who want some good bass but aren't looking to rip apart their walls
I dig it!! That is solid performance for 400.00!! I can see it being popular for those that can not put huge enclosures in their rooms!
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post #10 of 514 Old 06-17-2014, 05:39 PM
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Does this model this way only with that Dayton driver? Or are there other driver options like the Marty subs?
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post #11 of 514 Old 06-17-2014, 05:49 PM - Thread Starter
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Quote:
Originally Posted by lovinthehd View Post
Does this model this way only with that Dayton driver? Or are there other driver options like the Marty subs?
This driver models the best with the smaller enclosure. Better then the si, or other Dayton 15". Tough to find a 15" driver in this price range that performs well in 3.5cuft ported.
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post #12 of 514 Old 06-17-2014, 05:53 PM
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Did you just change the graph in OP? Looks like output increased 5db @ 20hz to 110db.
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post #13 of 514 Old 06-17-2014, 06:06 PM - Thread Starter
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Quote:
Originally Posted by basshead81 View Post
Did you just change the graph in OP? Looks like output increased 5db @ 20hz to 110db.
Changed length of port to 3" longer. Ltd did another graph and tuning dropped to 23hz from 25hz.
Output went up 4dbs at 20hz.
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post #14 of 514 Old 06-17-2014, 06:14 PM
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Nice. Wish I would of saw this before my wife ordered the dayton sub 1500
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post #15 of 514 Old 06-17-2014, 06:17 PM - Thread Starter
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Nice. Wish I would of saw this before my wife ordered the dayton sub 1500
Can you return it ?
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post #16 of 514 Old 06-17-2014, 06:18 PM
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Quote:
Originally Posted by chalugadp View Post
1.5" high by 25" long.

I wonder how the Micro-Cube would compare to my (3.6 cuft net) ported sub with the Dayton RSS 315 HO, with 4"x26" long port ? (bottom portion of Pic)
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post #17 of 514 Old 06-17-2014, 06:23 PM
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Can you return it ?
Not sure without paying mucho dinero for shipping lol. Maybe I can make this one at a later date and give away the Dayton to relative or something
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post #18 of 514 Old 06-17-2014, 06:30 PM
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Great idea, thanks for sharing. How hard would it be to tune it a bit lower, say 18Hz or so, and maybe have one dimension narrower..say...18" with the other two sides an inch or two larger to compensate? Could this be done in such a way to accommodate a lower tune? Also, I suppose once you go this small the 18's don't work well anymore?
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post #19 of 514 Old 06-17-2014, 06:34 PM - Thread Starter
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Originally Posted by randyc1 View Post
I wonder how the Micro-Cube would compare to my (3.6 cuft net) ported sub with the Dayton RSS 315 HO, with 4"x26" long port ? (bottom portion of Pic)
I don't know how to model with winisd but maybe you could and see
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post #20 of 514 Old 06-17-2014, 06:36 PM - Thread Starter
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Originally Posted by bear123 View Post
Great idea, thanks for sharing. How hard would it be to tune it a bit lower, say 18Hz or so, and maybe have one dimension narrower..say...18" with the other two sides an inch or two larger to compensate? Could this be done in such a way to accommodate a lower tune? Also, I suppose once you go this small the 18's don't work well anymore?
At this volume the tuning is at lowest point. Yeah 18's need more space.

If you had four micros you could hit some serious bass.
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post #21 of 514 Old 06-17-2014, 06:55 PM
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Hmm ok, just curious since this design is 5.35 cu. ft. external, the FV15HP is 6.0 external and tuned in the low to mid teens depending on one/two port.
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post #22 of 514 Old 06-17-2014, 06:57 PM
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Quote:
Originally Posted by chalugadp View Post
Changed length of port to 3" longer. Ltd did another graph and tuning dropped to 23hz from 25hz.
Output went up 4dbs at 20hz.
Nice!
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post #23 of 514 Old 06-17-2014, 06:58 PM - Thread Starter
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OK call me crazy but ...
What do you guys think of this.
If I sell my two minimarty enclosures, the si18,and the uxl18 ( that would be easy to sell) I could buy four of the 15" Dayton drivers and come out ahead a few hundred dollars. Then I build four micro-cubes and put one in each corner and my output ( assuming adding 11dbs like jbrown got) to graph in first post. My output would be higher then I currently have, better response at lp, and I could use front two micro-cubes as stands for my tempests. The two rear would be side tables beside my couch.

More output, save money .... What am I missing ???? My two inuke3000dsp could power the four.
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post #24 of 514 Old 06-17-2014, 07:00 PM - Thread Starter
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Quote:
Originally Posted by bear123 View Post
Hmm ok, just curious since this design is 5.35 cu. ft. external, the FV15HP is 6.0 external and tuned in the low to mid teens depending on one/two port.
This design is 3.5 cuft.
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post #25 of 514 Old 06-17-2014, 07:01 PM
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Originally Posted by bear123 View Post
Hmm ok, just curious since this design is 5.35 cu. ft. external, the FV15HP is 6.0 external and tuned in the low to mid teens depending on one/two port.
The FV15HP is 18hz(2 port)/14hz(1 port).
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post #26 of 514 Old 06-17-2014, 07:03 PM
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Quote:
Originally Posted by chalugadp View Post
OK call me crazy but ...
What do you guys think of this.
If I sell my two minimarty enclosures, the si18,and the uxl18 ( that would be easy to sell) I could buy four of the 15" Dayton drivers and come out ahead a few hundred dollars. Then I build four micro-cubes and put one in each corner and my output ( assuming adding 11dbs like jbrown got) to graph in first post. My output would be higher then I currently have, better response at lp, and I could use front two micro-cubes as stands for my tempests. The two rear would be side tables beside my couch.

More output, save money .... What am I missing ???? My two inuke3000dsp could power the four.
I like that idea a lot being you are not worried about sub 16hz output. However I do not think you will see a full 11db at the LP being all 4 subs will not be mutually coupled. I am guessing 9db with a nice even response across the seats. Also probably more tactile response with 2 being placed nearfield. Thats what makes my Triple XV15se fairly potent.
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Last edited by basshead81; 06-17-2014 at 07:06 PM.
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post #27 of 514 Old 06-17-2014, 07:05 PM - Thread Starter
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I like that idea a lot being you are not worried about sub 16hz output.
If I'm not worried about sub 18hz is there any other downside ?
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post #28 of 514 Old 06-17-2014, 07:08 PM
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None that I can think of!! I think the tactile response will go to another level with 2 micro cubes placed nearfield.
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post #29 of 514 Old 06-17-2014, 07:13 PM - Thread Starter
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Quote:
Originally Posted by basshead81 View Post
I like that idea a lot being you are not worried about sub 16hz output. However I do not think you will see a full 11db at the LP being all 4 subs will not be mutually coupled. I am guessing 9db with a nice even response across the seats. Also probably more tactile response with 2 being placed nearfield. Thats what makes my Triple XV15se fairly potent.
Even with 9dbs it would be at least even or 1-2 dB's more with what I have and nearfield would be cool.
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post #30 of 514 Old 06-17-2014, 07:22 PM
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in the same size box and tuning, it is roughly a 2.5:1 ratio 15ho to uxl, so swapping out a uxl and replacing with 2 15ho's would be a lateral type move at best. at least on paper (even considering the under rated xmax spec on the Dayton).
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