First HT DIY Subwoofer for a noob on a budget.. - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 100 Old 07-26-13, 11:32 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Ok, last 3 questions for now. #1. Lets say I didn't trust myself. If I found a 10 cu. ft., 17 hz. tuned design modeled for a different sub, would it work with my sub? I found this slotted port model online and wonder if it work for me.
http://www.istonline.ca/pagepics/enclosures/ixl18-1.jpg
http://www.istonline.ca/pagepics/enclosures/ixl18-2.jpg
#2. Also, does the type of port (slotted vs. port tubes) affect the final performance? Slotted would eliminate the need to purchase $40 worth of tubes. That alone could pay for the mdf.
#3. After reading more reviews of the Bash300, it appears the amp has a subsonic filter set to 22hz. Does this automatically mean I will lose all useable output below that cutoff?? That would seem to make this amp a losing choice for me.
Thank you for time,
Jeff
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post #22 of 100 Old 07-27-13, 02:04 AM
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Re: First HT DIY Subwoofer for a noob on a budget..

1. Yes, that will work just fine.

2. The type of port does not affect the performance, a slot port is perfectly fine.

3. If the Bash 300 you're getting is from Parts Express then the subsonic filter is at 17.7 hz. I believe the Bash 300 that has a subsonic filter at 22 hz was from O Audio and that company went out of business some months ago.

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post #23 of 100 Old 07-27-13, 01:37 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Mike, you rule!
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post #24 of 100 Old 07-27-13, 02:16 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

I hope you plan on taking pics of the build and starting a build thread.

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post #25 of 100 Old 07-27-13, 02:42 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

I will indeed!
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post #26 of 100 Old 08-06-13, 04:25 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Mike, I've been WAF'd down to the 6ft box. I have a couple questions. You mentioned 6ft^3 @ 20hz. Calculators show two 3in ports at 13.68in. Most ports I see around here are 4in. ports. Is there a problem using 3in flared ports? Bringing me to the second question, port length measurements. Flares are not part of that 13.68in, right? I need 13.68in of straight tube between the flares..?
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post #27 of 100 Old 08-06-13, 04:55 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

In WinISD you add one inch for flares, so 14.68". Round it off to 15" total length for each port and call it good.

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post #28 of 100 Old 08-06-13, 04:57 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Cool on the length part, 3in diameter is ok too?
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post #29 of 100 Old 08-06-13, 05:12 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

A pair of 3" ports is fine as long as they are flared.

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post #30 of 100 Old 08-08-13, 02:54 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Is there a performance difference between port diameters when they are properly spec'd to the box and driver? Any advantage to using two 4in ports that are longer over using two 3in ports that are shorter?
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