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Thread: Speaker size?

  1. #1

    Default Speaker size?

    I am new to the speaker design thing, and am struggling with a very basic question. How is a speaker's size measured? I purchased an Onkyo HT-R520 home theater system about 6 months ago and am now determined to make the front and center channel speakers sound good. I am going to remove and trash all speakers and tweeters, but don't know how to measure them for replacements. Do I measure the diameter of just the cones, or do I include the surrounds and the entire mounting? Thanks in advance for any assistance.

  2. #2
    Join Date
    Sep 2005

    Default Re: Speaker size?

    If you are going to use the same enclosure, measure the diameter of the cutout. Also give us the size of the enclosure and thickness and we can help you out a lot better.

  3. #3

    Default Re: Speaker size?

    Well, the hole is 4.5" and the speakers mount from the outside.
    So I guess there is no standard way of measuring a speaker... meaning, I can't just say "I need a 4 inch speaker" and expect it to fit. Makes ordering a replacement a bit tricky.

  4. #4

    Default Re: Speaker size?

    To clarify: I hear mention of 8, 10, 12 inch speakers. How are they measured? Then I'll be able to measure mine. I just need to know where to start in looking for replacements. I can check the other parameters once I determine a basic size. Thanks.

  5. #5
    Join Date
    Sep 2005

    Default Re: Speaker size?

    Drivers are measured from rim to rim, but if you are going to replace them and use the same box you have to check they're cutout diameter. Here are 2 drivers with different external diameters that'll work with a 4 1/2" cutout hole.
    <A HREF="http://www.partsexpress.com/pe/showd...number=295-330">http://www.partsexpress.com/pe/showd...number=295-330</A>
    <A HREF="http://www.partsexpress.com/pe/showd...number=296-155">http://www.partsexpress.com/pe/showd...number=296-155</A>
    The Audax would fit a little looser than the Dayton, but it would still work because the outer diameter is larger. Some drivers have smaller or larger cutout holes even though they're in the same size class. Check out the Dayton RS Driver.
    <A HREF="http://www.partsexpress.com/pe/showd...number=295-362">http://www.partsexpress.com/pe/showd...number=295-362</A>

    The outer diameter will just give you a ballpark figure.

    The second problem is matching the new driver to work in that size box you have.
    <A HREF="http://www.partsexpress.com/resource.../sb_guide.html">http://www.partsexpress.com/resource.../sb_guide.html</A>
    If you look at the Sealed and Vented columns in this guide you'll see that sizes are all over the place, but there will be a driver that'll fit.

  6. #6
    Join Date
    Sep 2005
    Baltimore, MD

    Default Oh, if it were only that simple

    Provided Link: Onkyo HT-S770

    The simple part. You measure a speaker at the outer diameter of it's frame. Now things get interesting. That size you just measured is sorta' approximate. One manufacture's 4-incher, may be a little smaller or larger than another's. On top of that, they'll probably have different size mounting holes even though they are still termed four inch speakers. That's where knowing where the mounting hole comes in.

    Now in the case of your speakers, what exactly is lacking in their sound? Often, the crossover and tweeter are where corners are cut to save $$. Is there any way to see what values are on the stock crossover parts? This will help us figure what the crossover frequency is and what replacement tweets will work.

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