An open back speaker, possible?

VR3
VR3 Posts: 28,774
edited September 2004 in Speakers
Since the subwoofer project is a no go, I just dont have the funds to do it now....

So.....

I thought about building a new enclosure for the Pioneers, make them thicker, from 1/2" to 3/4" and from particle board to MDF

And to save cost on wood, I plan to cut the enclosure off to where only the woofer uses a sealed enclosure, ported however.

So since the midrange I used is sealed in its own 'enclosure' - and tweeters dont need an enclosure, am I correct in that I could actually use an open back *ie, no sides or back* for the tweeter and midrange?

Just curious...
- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited September 2004
    Yes, you are correct.
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • VR3
    VR3 Posts: 28,774
    edited September 2004
    AWESOME!

    Thanks!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 50,731
    edited September 2004
    You'll need to be sure that the interior cabinet volume for the woofer remains the same as before.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • VR3
    VR3 Posts: 28,774
    edited September 2004
    I know....

    I also went on PE in their box builder since they sell the woofer and entered the number and checked out some options on port, polyfill variables...
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • phoneisbusy
    phoneisbusy Posts: 867
    edited September 2004
    Sorry to hear about the sub project. Was it starting to get a bit pricey?

    Dave
    Time is the best teacher. Unfortunately it kills all its students.
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  • VR3
    VR3 Posts: 28,774
    edited September 2004
    Yeah...getting in the 400 range...just cant do that with my harddrive and preamp and all...
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,774
    edited September 2004
    Here is what I have planned...

    I am going to use some Veneered Oak MDF or Plywood for the side panels, similar styling to the LSi except I am going with a 'flush' front with angled top and bottom and flush back...

    The rest of the visible cabinet will be wrapped in black grill cloth.

    The Tweeter and midrange will be visible, no grill -- the drivers will both be blue with a black frame, so they will indeed match.

    The woofer will have a 'driver' grill since it is close to the floor and it could possibly be kicked.

    I am going to use the Stock crossover, and that is about it...

    I am going on Box builder and getting the port size, etc down and they will have a rear-firing port - flared.

    And, will have gold plated binding posts instead of spring clips.

    This is my project idea, won't cost much at all....

    Should be solid down to 39hz.....
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • mhardy6647
    mhardy6647 Posts: 33,960
    edited September 2004
    It's completely possible to build a full range, "open baffle" (i.e., unenclosed) loudspeaker. There are many, many DIY examples, but also some commercial ones (e.g., the Gilmore Audio speakers, see http://www.glacieraudio.com/new%20Glacier%20Audio%20Site/Products%20folder/Gilmore/Gilmoreaudio3.htm)
    The Carver Amazings were also open baffle.

    To get any sort of LF performance from an open baffle/backless design, it's necessary to use a very large baffle and a woofer with a high (maybe even ridiculously high) Qts (i.e., relatively weak motor). This was de rigeur in the days of the "console hi-fi" units, which almost invariably had open-backed speakers in 'em.

    Of course, practical considerations might make a subwoofer an attractive addition, but there have been many fine backless speaker systems built over the years.
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  • mhardy6647
    mhardy6647 Posts: 33,960
    edited September 2004
    edited...

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  • mhardy6647
    mhardy6647 Posts: 33,960
    edited September 2004
    ... wasn't obvious in the first picture, here's another angle. :-)
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited September 2004
    I'm ashamed of you man.

    How dare you post those friggin corian countertops, from that assclown Gilmore. Not to mention, the girl is ALMOST as ugly and fake as the speakers themselves.

    SURELY you could find another example of an open baffle speaker.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • gatemplin
    gatemplin Posts: 1,595
    edited September 2004
    Originally posted by RuSsMaN
    ... that assclown Gilmore.

    Are you sure? I could be wrong but he looks like a gnarly dude. Surfs up!

    Mark "Milhouse" Gilmore
    mark-blackspkr.jpg
    Graham
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  • tryrrthg
    tryrrthg Posts: 1,896
    edited September 2004
    how about these?

    http://home.comcast.net/~audio-worx/page70ArvoPartProject.html

    ArvoUltra3.jpg
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15
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  • mhardy6647
    mhardy6647 Posts: 33,960
    edited September 2004
    .... I find the whole "Gilmore" imbroglio amusing, too. I actually didn't mind his schtick, because I figured (assumed) he was poking fun at the "sex sells" audiophile mentality.

    Never heard 'em, but the word on the street isn't so good. Guess I should've found a picture of some Carver Amazings...

    BTW, speaking of sex and selling audiophila, have you seen Doc B's foray into cables?

    http://www.bottlehead.com/et/cable/bottleheadcable.htm

    (again, I'm hoping the good Dr. is poking fun at this trend in marketing, although his products have always, umm, oozed, a certain puerile sexuality)
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  • VR3
    VR3 Posts: 28,774
    edited September 2004
    Hmm, those Gilmore speakers are funny....hehe

    The girl looks like a man....

    ANYWAY

    The whole design idea of the 'Hybrid' Pioneer it to get the tweeter and midbass away from the woofer.

    The other idea is to save cost on wood, which is the biggest problem I am having now.

    The midbass has its own enclosure which eliminates its need for an enclosure all together.

    My idea will be to put the port in a rear firing position to eliminate alot of the port noise that is heard with these speakers...

    and to completely copy the front baffle of the original Pioneers, IE: Woofer, Midrange, Tweeter seperation on the baffle, and position on the baffle from the sides, etc....

    The enclosure will probally be using 3/4" MDF - which will be a nice upgrade over the 1/2" particle board it uses now.

    The side panels will probally be 1/2" or 3/4" Oak veneered Particle Board, or possible solid oak. Depends if the teacher has some laying around.

    I would like to upgrade the crossovers too, but I dont want to waste to much money on them....
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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