Dayton RS225-4 in smaller vented boxes - diyAudio
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Old 26th December 2015, 07:16 PM   #1
Kimi is offline Kimi  Finland
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Default Dayton RS225-4 in smaller vented boxes

I'm keen to use the Dayton RS225-4 (I need the 4 ohms version) reference woofer in my next project due to the nice price (even here in te EU) and the even nicer comments it gets from other builders, but I have a small problem: The enclosure size.

WinISD gives 72 L (~2, 5 cu ft) box and Parts Express recommends about 43 L box (1,51 cu ft). These are quite different, but not a big surprise I guess if the WinISD always aims for the lowest f3 point.

I have space for about 30...35 litres (1...1,2 cu ft) and would like to use the woofer from about f3=40 Hz to 300 Hz or so.

WinISD says that a 35 L box with 25 Hz tuning would give a f3 point of ~40 Hz and less than 1 dB hump between 70-200 Hz. GD @40 Hz would about 8 ms (without filters) which I hope is not too bad yet.

So the questions are: What's the "perfect" or recommended enclosure size and does the RS225-4 work in about 1 cu ft vented box? What sizes have others used?

Then of course the mandatory stupid question: What else (in general) than the low frequency extension changes in the sound of a woofer in a vented box when the box size changes to smaller from the calculated optimum? Does it become i.e. boxy/boomy/thin/faster/slower/...?

I guess that Parts Express would not recommend a smaller box if it didn't bring some benefit over the WinISD size.

So far I have mostly built other peoples designs and never really experimented with anything so I gotta ask.

Thanks in advance!
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Old 26th December 2015, 08:41 PM   #2
xrk971 is offline xrk971  United States
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I use a 24 liter box with the 8 ohm version. Sealed and with Linkwitz Transform to get f3 of 42Hz and force Q=0.5. This has max SPL of 95dB before hitting xmax. I think same volume works with vent as well and no LT needed also about same f3 but less excursion so can go higher SPL. Very nice woofer.

10F/8424 & RS225-8 FAST Ref Monitor
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