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Thread: Cone woofers?

  1. #1
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    Cone woofers?

    I just bought a pair of 6x9 boxes (for $30) for my $270 speakers. I installed them and swapped them into my home stereo, replacing the $40-a-pair, 2-way bookshelf speakers. I did this just to test, but was dismayed to find out that these speakers just don't put out any bass. They're being shown up by my cheapie bookshelf speakers!

    I don't know why this could be, but I was wondering if a cone woofer in the back of the box would imporve things (my stereo speakers have cone woofers). What do you all think? Is it worth trying, or should I just rely on the X-bass on my head unit?

  2. #2
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    Re: Cone woofers?

    often the case with alot of car speakers (6x9's in particular) is that they are intended to run 'free-air' whilst you have made a 'sealed' enclosure by placing them in boxes...

    I had the same problem a few years back with some Sony 6X9's...

    what you need to do is make the enclosures 'ported'. bore/drill a 40/60mm hole in the back of the enclosures to let air get around..... that should be big enough...

    you should be happy with the result....

    BTW x-bass is just a cheapie EQ circuit on head units.... if it did work it would only be a band-aid solution to having a better designed speaker/enclosure...
    Project - GAME OVER :(

  3. #3
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    I was thinking of that. I'll give it a try.

    So the hole ought to be enough, you don't think I need to bother with a cone?

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    Okay, I took the speakers out of the boxes and used 2 9mm hole saw (it's the biggest I have) to make an off-center hole in the back of the boxes. There's definitely a difference, but it seems that the mid range tones are more pronounced now. If I put my ear to the hole, it is definitely thumping out some bass, but from a few feet, the midrage definitely is predominant. Chould this be due to the 29mm hole? Should I enlarge it? I figured I could always enlarge the hole but I can't make it smaller. Any input for me? Thanks guys!

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    alrighty... if you want to take the time to build it... i would suggest putting a port tube on the boxes you bought...

    obviously, you cant put the port in the box, but having the port tube on the outside of the box will accomplish the same thing...

    im not sure how you have these boxes oriented, short and wide, or tall and skinny, but either way this will work. if you fit a piece of pvc to the hole, which is ofset you say, use an elbow to turn the pipe so that it runs along the back of the box, and then use another elbow to turn it so that it turns the port toward the listener....

    i would also enlarge the hole, that you put in the back of the box. 29 mm is only about 1 1/8 inches...

    i dont know if this will work, but it might be something worth trying... you would have to experiment with the length of the port tube to get the optimal sound, but i think it would be fun to try....

    on the other hand, you might just be better off finding a set of bookshelf speakers with a 6 inch mid-woofer, and a ~1 inch tweeter, which are already made for a home stereo...

    by the way, if you have the little 6x9 boxes that i have seen, i highly doubt any of this will work... the sides look like trapezoids, and the boxes are barely bigger than the speakers themselves...

    good luck!!!

    ~mike
    Single Member of the "1000 Post and No MP3 Car" Club
    PROJECT ON INDEFINATE HOLD... BOUGHT A HOUSE
    2000 Cavalier Z24 [###-------] Only 30% Done ... Still

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    28.6 mm = 1 1/8 inches

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    Yes, I do have the smaller boxes. The sides are trapezoids and the face of the box is just slightly larger than the speaker grille.

    But there must be something I can do. Would enlarging the hole cause the lower frequencies to respond more like the midranges are now? What about poly-fill? I've heard it said that poly-fill will make the box act as though it's 1/4 larger. And since the hole is offset, I could put a port on the inside, although it wouldn't be very long. What about a short port on the inside in addition to stuffing them with poly-fill? Certainly there must be something I can do. Any suggestions? Thanks!

  8. #8
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    Ok, first of all... If you just randomly stick any size port tube into the box you are basically rolling the dice for what happens... A tuned port is just that, its designed to change the resonant frequencys of the box at certain frequencys... It is not something that will majically shoot out bass if you point it at your head! I would suggest if you really want to make the most out of you 6x9's that you get all the spec's (theil (sp) small parameters) and use a box building program that will calculate the correct size, port dia/length, ect.. If you dont want to put that much time into the experiment, try a couple of other things: Place your enclosures in the corner of the room and keep moving them away from the corner a little at a time then listen in the main area... you will find that low frequencys will bounce off the wall and combine with the next wave giving huge boosts but it is not a perfect solution as you can also have cancellation occur... if you are going to experiment with random port size/lenght, I would suggest you get yourself some paper towel rolls and chop them into different lengths and try them out, then experiment with how much sticks in and out of the box as this will change things slightly as well...

    Good luck

    Mike

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    Thanks, that helps.

    For the record, these are going in the car.

    Right now I'm pretty sure the next step is to enlarge the 29mm hole. In order to do this, I'm going to have to buy a larger hole saw. How do I determine the size of the hole saw I should use? Should I use one that is the same size as a toilet paper tube?

    Honestly, I don't have the time or the materials to mess with custom enclosures. I just want to maximize the bass response so my rear 6x9's can hold me over until I can afford a real subwoofer. I'm not expecting huge thumping bass; my bookshelf speakers are putting out all the bass I really need, but I obviously don't want to put them in my car. I just figured there was something relatively simple I could to to improve things.

    Okay, here's my current game plan... Tomorrow I'll go get a hole saw that is as close as possible to the size of a toilet paper tube, I will enlarge the hole, and then experiment with the tube. When I get it to a place I like, I'll glue it in.

    Cheap, yes. But also quick and easy and will (hopefully) suit my purposes. Could I get some feedback on this idea? Anything would be appreciated. THanks!

  10. #10
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    Why not just buy a cheap 8 or 10 inch sub to fill in the bass... and just use the 6X9s for midrange and treble... My cheapo 10inch has more than enough bass for my likeing... the speaker only cost $AU40, and I built a box for it for less than $AU30... Only prob is now I have to find/make an amp to drive it.... The key is to look for subs that are reduced, possible to clear.. Mine was a cheap one in teh first place, about $AU60.... It still sounds better, and has a better bass response than my friends cheap 12inch.....
    I am planning on using the 10inch sub with a pair of $AU30 6.5inch 3way car speakers, and the original 4inch car speakers (which actually have alright bass for their size..

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