Is the Dayton DVC310 Made of magic? - AVS Forum
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post #1 of 11 Old 11-21-2012, 02:17 PM - Thread Starter
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Hi everyone,

I'm about to place an order for the following:
Dayton Audio DVC310-88 12" Driver
Yung SD300 300W Class D Subwoofer Amp

I've modeled this in WinISD and it seems to me indicating that this driver in a 2.5 cu-ft box will yield an f3 of about 25 Hz!!! it seems (based on modeling more expensive drivers in WinISD) like too much output for the given box size.
WinISD's SBB4 alignment recommends 1.7 cu-ft. Again, this seems way too small for the output WinISD is telling me I'm going to get from this driver.

Can anyone else sanity check this?? Also, while you're at it, I'd love to hear your thoughts on this build. Anyone notice any glaring problems with this driver/amp/box/tuning?

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post #2 of 11 Old 11-21-2012, 02:38 PM
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One thing you want to check is port air velocity. I imagine you would have to have a pretty long port in that size box to keep velocity down.
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post #3 of 11 Old 11-21-2012, 02:43 PM - Thread Starter
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WinISD says

1x 4" diameter port at 18.4" long will hit 27.5 m/s.
2x 4" diameter ports at 40" long will hit 13.5 m/s.
2x 3" diameter ports at 25" long will hit 21 m/s.
3x 2.6" diameter ports at 26" long will hit 20 m/s.

Not sure which path to choose. Either way, I'm gonna have to right angle bend them. But I plan on using a gradual bend (pvc fittings) and not a hard bend.
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post #4 of 11 Old 11-21-2012, 04:05 PM
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yeah, that is what happens with small enclosures with low tuning and appropriately sized ports...they need bends.

i don't see any glaring errors. the high pass filter will keep excursion under control below tuning.

go to the eq filter tab and add a highpass butterworth 2nd order at 22hz for a rough idea of the highpass effect on port velocity.

two 3" flared ports should be fine for a 12" with 300 watts. you might hear some chuffing if you just run 25hz sine waves, but in movies you will have all kinds of other bass blasting away which will mask most of that.

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post #5 of 11 Old 11-21-2012, 04:07 PM - Thread Starter
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5x 2" diameter ports at 25.5" long will hit 22 m/s. And it only takes up about .3 cu-ft of space internally. Are there issues with using multiple smaller ports?
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post #6 of 11 Old 11-21-2012, 04:26 PM
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the flares on the small ports tend to be smaller.

you are in the ballpark.

not sure if you caught my edit a post back. two 3" should be fine.

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post #7 of 11 Old 11-22-2012, 04:19 AM
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I highly recommend not using that Yung 300 watt plate amp as it has a non-defeatable high pass filter at 30hz. I have no idea why they would do this but the reality is that this amp is not meant to be using powering subwoofers in a home theater type setting with expectations of sub 30hz bass.
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post #8 of 11 Old 11-22-2012, 04:34 AM - Thread Starter
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I was following a thread at Home Theater Shack that made the same claim. it was later uncovered that the filter in questions was actually a 21 Hz high pass (down 3 dB at 21 Hz). While still a bit too high in my opinion, I believe it to be adequate/workable for any sub designed around a 21-30 Hz lower limit.

Please let me know if you have further information on this.

Link to relevant forum post.
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post #9 of 11 Old 11-22-2012, 01:51 PM
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Trust me, the filter response is not what Mike V. from PE claims. I don't blame him, as I suspect he got his info from Yung. Find one of the few active HPF calculators on the web, and see the response for yourself. The caps used are .22uf. The small resistor in the 200W-6 model is 10K, big resistor is 57.6k. On the CSS amps, these resistors are 6.8k and 82.2k respectively. If my spreadsheet is right, you'll find that the Fc is 30Hz for both of these models, which jives more with 'all SD models has a subsonic filter with an Fc of 30Hz' that came from Yung. The specs for the 200w-6 that I got from PE DO NOT match the actual filter response, which tells me Yung has provided inaccurate info to PE.

If you do model it and get different results, please let me know.

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post #10 of 11 Old 11-22-2012, 01:56 PM
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"I highly recommend not using that Yung 300 watt plate amp as it has a non-defeatable high pass filter at 30hz. I have no idea why they would do this but the reality is that this amp is not meant to be using powering subwoofers in a home theater type setting with expectations of sub 30hz bass."

i already explained this one. it is not as bad as it seems. i'll go see if i can find the post.

http://www.avsforum.com/t/1438806/looking-for-some-advice-on-building-a-ht-subwoofer/60#post_22598223

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post #11 of 11 Old 11-22-2012, 02:05 PM
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To correct myself....MIke V.'s comments are indeed correct. I just modeled my two amps again using a more advanced spreadsheet, and 21Hz does indeed look to be at the -3dB point. Still a nasty looking peak above it, so be careful if using with a ported sub (make sure you account for the peak/boost), but the number is as he stated.

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