Speaker box design help - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 21 Old 01-13-14, 09:17 PM Thread Starter
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I was going to start with an old punch 150 because that's what I have right now. But I can upgrade later
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post #12 of 21 Old 01-13-14, 09:23 PM
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Re: Speaker box design help

I've been running the numbers, the driver can handle 200 watts with a subsonic filter at 25 hz. The recommended port with 10 inches of port area is smaller than a 4" round port. Going any smaller to get the net volume up will run the risk of port noise.




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post #13 of 21 Old 01-13-14, 09:29 PM
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Re: Speaker box design help

Quote:
newfi wrote: View Post
By the way mike. How did you figure that so fast. I have been working on this for a while now. Maybe you can help me design a box hint hint
I think he cheats myself.
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post #14 of 21 Old 01-13-14, 09:29 PM Thread Starter
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No subsonic filter on this amp. Old punch 150a2
I think I see what you saying though. So in other words to avoid port noise I need to stay around the target number 10sf. But to tune it that low I would then have to add about .28 cf to get back to .6 cf
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post #15 of 21 Old 01-13-14, 09:35 PM
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Re: Speaker box design help

Yes, you could probably get away with a .5 cu.ft. net volume.




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post #16 of 21 Old 01-13-14, 09:42 PM Thread Starter
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I guess that would be easier. A lot shorter in length. You think that .1cf smaller in size would be very noticeable? I could expand my box in width somewhat
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post #17 of 21 Old 01-13-14, 09:48 PM
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Re: Speaker box design help

If you can go bigger than go bigger. Best to keep to the recommended box size and tuning if you can.




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post #18 of 21 Old 01-13-14, 09:51 PM Thread Starter
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Well the recommended size for ported is .6cf but also tuned at 40hz. I figured I could go lower if I wanted to
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post #19 of 21 Old 01-13-14, 10:40 PM Thread Starter
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What's the thinnest mdf that you would use. I'm not sure if I should go any thinner than 3/4"
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post #20 of 21 Old 01-14-14, 03:42 AM
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Re: Speaker box design help

A 40 hz tuning would make the port shorter and take up a bit less cabinet volume. 3/4" material is minimum in my opinion.




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