Announcement

Collapse
No announcement yet.

The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Originally posted by billcurrier View Post
    Thanks, I just bought the RS150-4 in the last two weeks. The Vifa XT25's are in Arkansas and the Dayton RS are in New Mexico. Will probably be my Spring Break project.
    That seems geographically challenging. Let me know how it goes and if I can help out at all!

    Leave a comment:


  • billcurrier
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Originally posted by tyger23 View Post
    Perhaps ;). I'm still hoping to pull together a Texas DIY event sometime this spring, so we'll have to see where they make their debut.

    Did you ever get around to building the Aria's? Let me know what you think if you did, or if you just have any questions!
    Thanks, I just bought the RS150-4 in the last two weeks. The Vifa XT25's are in Arkansas and the Dayton RS are in New Mexico. Will probably be my Spring Break project.

    Leave a comment:


  • ligs
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Very interesting. Naming your ultra-small speakers as Marisosas, this reminds me
    of Mariposa Grove, Yosemite National Park as I just came back visiting that place.

    http://www.sunset.com/travel/outdoor...984/page6.html

    Leave a comment:


  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Originally posted by billcurrier View Post
    I heard the Arias at Lone Star and had a pair of Vifa XT25 and went out and bought the Dayton Reference 150 - 4 ohms. Nice to have a budget crossover to go with budget speakers. Maybe I will get a chance to hear them at this year's Lone Star?
    Perhaps ;). I'm still hoping to pull together a Texas DIY event sometime this spring, so we'll have to see where they make their debut.

    Did you ever get around to building the Aria's? Let me know what you think if you did, or if you just have any questions!

    Leave a comment:


  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Originally posted by greywarden View Post
    Is that 5 microphones in the pictures that you're taking measurements in???
    Yep - but only the center one (silver) was used for this project. The silver mic is my personal Omnimic setup. The four black mics (Beyerdynamic MM1's) are the work setup. Believe it or not, many of the computers you use in your day-to-day life were "tuned" on that table with those 4 black mics.

    Leave a comment:


  • billcurrier
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    I heard the Arias at Lone Star and had a pair of Vifa XT25 and went out and bought the Dayton Reference 150 - 4 ohms. Nice to have a budget crossover to go with budget speakers. Maybe I will get a chance to hear them at this year's Lone Star?

    Leave a comment:


  • johnnyrichards
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Awesome job, Tyger!

    Leave a comment:


  • greywarden
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Is that 5 microphones in the pictures that you're taking measurements in???

    Leave a comment:


  • arlis_1957@yahoo.com
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    nice Ty. Your little girl should love them.

    Leave a comment:


  • thekorvers
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Very nice little project. Thanks for sharing.

    Leave a comment:


  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Here's the PE cart, just in case anyone wants to know:

    Click image for larger version

Name:	Mariposa cart1.jpg
Views:	1
Size:	75.3 KB
ID:	1152833

    Click image for larger version

Name:	Mariposa cart2.jpg
Views:	1
Size:	92.5 KB
ID:	1152834
    Last edited by tyger23; 09-17-2013, 10:40 AM.

    Leave a comment:


  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Now, as I mentioned above, I also tried them out in different environments and they seem to be a butterfly of sorts. They can fly around and land just about anywhere and sound pretty once they lite.

    Here's the frequency response of the Mariposas when up on a stand in the middle of the room. These measurements were taken in a more normal method (at 1M and 1W). The graph shows a 0, 15, 30, and 45 degree response. It's pretty darn'd flat up until you get to around 45 degrees.

    Click image for larger version

Name:	Mariposa Final EQ Frequency Response (Freestanding, 1M).jpg
Views:	1
Size:	137.0 KB
ID:	1152831

    Here's the associated distortion curve when on a stand (not much change from the flanked environment):

    Click image for larger version

Name:	Mariposa Final EQ Distortion Curve (Freestanding, 1M).jpg
Views:	1
Size:	75.7 KB
ID:	1152832

    For anyone who's wondering, the sensitivity of these measured at 81dB. They'll take just about anything you want to throw at them power wise. I was using a class-AB 20W amp, and the amp was giving out before these were. I do think these would be a perfect match for a little Lepai amp in the computing environment, but they can take more.

    I hope anyone who tries these enjoys them! They're certainly not up to the snuff that my Aria's can accomplish, but these are about 1/3 the cost. The current cost for these designs (including the cabinets) is $77.90.

    The overall sound is pretty mellow, but it has a very detailed top end and quite a bit of punch around 100hz. I'm actually really impressed by that ND16FA. The HiWave is OK. It's got great off-axis response (as advertised), but that suck-out at 2K is problematic, and the paper cone just isn't as detailed as a RS series (obviously). I enjoy them, and I think they'd be better than most any computer speaker you can purchase for the same money! Add a little sub, and these are amazing.

    Leave a comment:


  • tyger23
    replied
    Re: The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    Again, I had conceptualized these to be small, affordable computer monitors. With that in mind, I took the FRD and tuned them in this environment:

    Click image for larger version

Name:	IMG_1759_800x600.JPG
Views:	1
Size:	97.0 KB
ID:	1152826

    Basically, I set up the speakers flanking a 15" laptop. This tuning turned out surprisingly well, because the speakers worked as bookshelf speakers placed slap up against the wall, or as free-standing speakers (more on that later). Essentially, these guys just work well in most environments.

    I will note one word of caution - when flanking a computer monitor or laptop, make sure the tweeters are on the OUTSIDE of the computer. For some reason, this made a tremendous difference in the phasing, and the tuning turned out much better this way.

    Since this is a low-cost build, I wanted to keep with a low-cost crossover. So, there's just 5 parts total!

    Click image for larger version

Name:	Mariposa Final Schematic.jpg
Views:	1
Size:	67.7 KB
ID:	1152827

    It's ultra-simple, very small, and very cheap. I used NPE caps for this build mostly because I don't think the drivers deserve anything better than that. They're crossing over around 3K. It's tough to really nail down an exact crossover point because of the way the HiWave's dip at 2K affects it's frequency response. However, there's a decent reverse null occurring around 3K when you reverse the tweet. Here's how the individual driver response looks:

    Click image for larger version

Name:	Mariposa Final EQ Driver Response Curve.jpg
Views:	1
Size:	112.8 KB
ID:	1152829

    In the above environment (flanking the comptuer), the response turns out quite well. Here's the response curve at 0deg, 30deg, and 45deg:

    Click image for larger version

Name:	Mariposa Final EQ Frequency Response Curve.jpg
Views:	1
Size:	122.5 KB
ID:	1152828

    And here's the distortion curve in the nominal listening environment:

    Click image for larger version

Name:	Mariposa Final EQ Distortion Curve.jpg
Views:	1
Size:	75.4 KB
ID:	1152830
    Last edited by tyger23; 09-17-2013, 10:39 AM.

    Leave a comment:


  • The Mariposas - An ultra small, extremely versatile 2-way (ND16FA + HIBM65C20-8)

    So, I'd like to present the forum with my second design - The Mariposas. These were conceptualized to be an ultra small, computer speaker set for my daughter. Her favorite movie is Barbie Mariposa and her favorite insect is a butterfly, so it just fits.

    When I finished the design, I spent a little time moving them around into different spaces, and they seem to work just about everywhere. In addition to computer monitors, I could see these being used as bookshelf speakers, surround speakers, or even built-in to a soundbar type thing for TV audio.

    The concept behind the design was to start with something simple and small (the PE "Micro" knock-down cabinets) and stuff them with the largest and most inexpensive speakers that would fit. So, being curious about the $6 HiWave speaker and noting that it would fit (just barely), I decided to go for it. Just note that the price of these HiWave's have been upped to almost $10 now.

    The tweet would have to be something that would fit in the leftover space, which really isn't much. The ND16FA fit the bill, and it fit.

    Being honest, I didn't actually buy the PE cabinets - I just copied the design and size and made it from some leftover 1/2" MDF that I had laying around. You can't really imagine just how small these things are without actually holding them in your hand. They're tiny cabinets, but it works for the intended usage (computer speakers).

    I'm not going into much detail about how to build these cabinets. To be honest, it's probably well worth anyone's time to just buy the cabinets from PE and build them. I will, however, detail the baffle:
    • The tweeter is a 1.25" hole that's centered 1.25" from each corner. Note that the tweeters are offset, so make sure to build one speaker with the tweet on the left, and one speaker with it on the right.
    • The woofer is centered on the baffle (2.25" from each side, and located 2.625" from the bottom edge). That's 2 5/8" in case you're wondering.
    • The woofer flange is 4.25" by 3/16" deep. The cutout hole is 3.25".
    • The woofer needs to have the back of the baffle chamferred around the screw holes in order to allow for better airflow around the back of the woofer. See the pic for details.


    The enclosure is completely sealed, and I placed in 5 large handfulls of ploy-fill (acousti-stuff should work as well). Basically, this is about 2 ounces of poly-fill, and it's stuffed to the max. In fact, the poly will actually push the woofer out if you don't have the screws holding it in. So, stuff it until it's full, and then add about twice as much again.

    Here's how the speakers look in their "unfinished" state:

    Click image for larger version

Name:	IMG_1679_600x800.JPG
Views:	1
Size:	103.6 KB
ID:	1186699

    Click image for larger version

Name:	IMG_1680_600x800.JPG
Views:	1
Size:	103.3 KB
ID:	1186700

    Click image for larger version

Name:	IMG_1681_800x600.JPG
Views:	1
Size:	90.2 KB
ID:	1186701
    Last edited by tyger23; 12-25-2014, 02:54 AM.
Working...
X