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SB17NRX2C35-8 in reflex

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  • PWR RYD
    replied
    Originally posted by fatmarley View Post

    That's exactly the figure I came up with.
    I modeled it at 20 watts input with a series resistance of 0.3 Ohms (pretty reasonable DCR I think for an appropriate sized series inductor for an 8 ohm driver with a crossover point in the 2 kHz - 2.5 kHz area). Some folks might go for a much larger box for a lower F3. But the lowest possible F3 isn't always the best design decision. Other parameters take a hit.

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  • billfitzmaurice
    replied
    Originally posted by PWR RYD View Post
    Why QB3?
    Good point. Alignments were useful in the days of slide rules or scientific calculators, but when modeling software allows you a literally infinite number of 'alignments' to choose from with just a few mouse clicks there's no reason to choose QB3 or any other predetermined formula. WinISD defaults to maximally flat, or at least the traditional alignment that comes closest to it, but once you have that suggested box size and tuning you don't have to stick with it, you use it as a starting point and then tweak the volume and tuning until you get what works best for your application.

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  • fatmarley
    replied
    Originally posted by PWR RYD View Post
    18 Liters net with a 2" diameter port that is 7" long.
    That's exactly the figure I came up with.

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  • PWR RYD
    replied
    Originally posted by Audio4me View Post
    do you used it ?
    What sim software do you used ?
    my simulation software gives me 28 liters for QB3
    I don't use it. You listed absolutely zero criteria, so I gave you my opinion of what I would build for that particular driver. I use Unibox for bass simulation. Why QB3?

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  • fpitas
    replied
    If you're not very technical, try downloading AJ Vented, here:

    https://www.ajdesigner.com/speaker/ajvented.php

    Leave a comment:


  • KEtheredge87
    replied
    Audio4me , there's a few free options to use when simulating driver performance in an enclosure. WinISD is a good one, as well as Unibox, and some of Jeff Bagby's response modeler software. Still others have had success using a package called VituixCAD, but that one is a bit advanced for looking at potential box designs. I would also recommend taking a look at these software packages to get a more custom approach than aiming for a straight 3rd order Quasi-Butterworth alignment. Those alignments were created to give design guidelines to our speaker designing predecessors who did not have the luxury of free and well designed software packages to help them. Using the software packages will give you a better idea of the performance you can expect.

    Best of luck!

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  • Audio4me
    replied
    do you used it ?
    What sim software do you used ?
    my simulation software gives me 28 liters for QB3

    Leave a comment:


  • PWR RYD
    replied
    18 Liters net with a 2" diameter port that is 7" long.

    Leave a comment:


  • Audio4me
    started a topic SB17NRX2C35-8 in reflex

    SB17NRX2C35-8 in reflex

    i want load this driver in reflex loading, which liters and duct do you suggest ?

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