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Thread: A7 or 816A cabinet for 421A

  1. #1
    Inactive Member Stevenvegt's Avatar
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    I'm a bit in a dilema.
    I was planning to build the A7 cabinet for my 421A speakers, but they are large.
    Now I found on the internet some specifications of the 816A cabinet.
    http://www.voiceofthetheatre.com/816A.th.htm
    In that sheet was written that the cabinet is designed for this speaker.
    (sorry my english is not very well but I hope you will understand me forums )
    The speakers are for a relative small room.
    Size is little important, the sound more.

  2. #2
    Inactive Member Murray Keidge's Avatar
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    Hello,
    Yes the 421A will work in either cabinet, however the 416 or 515 is better suited to the horn loaded cabinet.

    Depending on your preference of sound and the size of your room you may find a front loaded cabinet will work better than a horn loaded.

    If you to choose the horn loaded cabinet, then I would suggest the 828(A7) to be a better perfromer than the 816.

    Please call if you want any further details.
    Murray.

  3. #3
    Inactive Member Stevenvegt's Avatar
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    Wat is the difference in sound between a horn and an front loaded system? (newbee question forums )

  4. #4
    Inactive Member marcuswilson's Avatar
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    I agree with Murray, The A7 is a far better cabinet.

  5. #5
    Inactive Member Stevenvegt's Avatar
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    Another question: wich enclosure is the best one, the 825 or the 828H?
    And were is the difference in these two designs?

  6. #6
    Inactive Member Fitts's Avatar
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    The A7 cabinets are big but they are great. I have never heard anything better. If you are careful laying out your patterns you can get two A7 cabinets from just three sheets of four foot by eight foot plywood. Try to find plans for the cabinet that has the full width speaker mounting panel and avoid the designs that had the small almost square speaker mounting board. I found that the full width panel added a lot of strenght and rigidity.

    Best wishes and use lots of glue !!

  7. #7
    Inactive Member radiolee's Avatar
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    Hello!

    Thought I'd weigh in on this one.
    I have plywood A-7's with 421A woofers. They sound fantastic and have usable response below 25 hz.
    Go for it.

    Peace
    Lee

  8. #8
    Inactive Member Stevenvegt's Avatar
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    Tank you all for the tips.
    I've found the plams with the wide speaker mounting panel.
    Soon I wil post some pictures from the cabinets. I'm now building them, and the are huge!!.
    A friend of my who makes kitchens has sawed all the plywood panels at 45 degrees, and it's looking very nice forums
    I can't wait to test them!

    Another question (or do I have to make a new Topic for it?)

    How about isolation?
    Were do I place it. The room is not so big, Can I just fill it up, or must I leave some panels emty?

  9. #9
    Inactive Member Fitts's Avatar
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    Sounds like you are going to have a very nice pair of cabinets. I hope you can post a picture of them when you are done.

    One effect of adding fiberglas is that it increases the apparent volume of the cabinet. Using insulation you can adjust the volume of the cabinet to best match the specifications of your speaker. Insulation can also help control resonances that occur between opposite side of your cabinet.

    When I built my A7's, I experimented adding insulation to one panel at a time and in the end I felt the best sound was with no insulation at all. I suggest you experiment with one inch thick pads of fiberglas insulation. Start with the insides around the speaker. Add insulation to one panel at a time until you find the best sound for you.

    One other suggestion, don't use a grille cloth unless you really need to. I put a grille cloth on the front of mine that was a loose open weave burlap type cloth but it made the speakers sound dull. If you have to use a grille cloth I recommend you find some real speaker grille cloth material.

    Good luck,

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