Review my subwoofer design please

hooligan72 · 4th March 2011, 03:22 PM

Please take a look at this subwoofer design. Any feedback would be appreciated. Thanks.

It will use:

Dayton classic 15" 295-470

Bash 300 or Bash 500 plate amp

The box will be vented 9 cu ft net

Two 17" flared ports

Bassbox pro and winisd show show a pretty flat response with F3 at about 22hz
Dayton classic 15 19hz.png

The sub will be front firing and vents will be side firing into the remaining space of a recessed opening in a concrete wall.

Thanks in advance

seanny · 5th March 2011, 09:04 PM

You need a X brace like Earl's.
What is the diameter of those ports?

hooligan72 · 5th March 2011, 10:42 PM

The vents are the 4" flared from PE. I thought that two 4" vents would be large enough to avoid chuffing.

I haven't finalized the bracing yet. If you can provide a link to Earls design I would love to have a look at it. I can always recalculate volume to reflect different bracing.

Thanks in advance.

Cokewithlime · 11:30 PM

Quote:

Originally Posted by hooligan72

Please take a look at this subwoofer design. Any feedback would be appreciated. Thanks.

It will use:

Dayton classic 15" 295-470

Bash 300 or Bash 500 plate amp

The box will be vented 9 cu ft net

Two 17" flared ports

Bassbox pro and winisd show show a pretty flat response with F3 at about 22hz
Attachment 212552

The sub will be front firing and vents will be side firing into the remaining space of a recessed opening in a concrete wall.

Thanks in advance

If you haven't purchased the driver yet, you should consider the Dayton DCS385-4 15" Classic sub driver.

- only $10 more and it has a lower qts(more suited to being ported) lower Fs, more xmax and better power handling

hooligan72 · 7th March 2011, 01:49 PM

I think we're looking at the same woofer. Did you mean to post a different link?

hooligan72 · 7th March 2011, 02:02 PM

I think I found the one you're talking about.

295-206?

Qts 0.43

Vas difference is huge. I'll have to remodel.

seanny · 7th March 2011, 11:08 PM

I can't find that picture anymore.

hooligan72 · 8th March 2011, 10:28 PM

Dayton Audio DCS385-4 15" Classic Subwoofer 4 Ohm

Is this the one?

Also, I tried doing a search for Earl to check out his design. Can you post a link?

CharlieLaub · 8th March 2011, 10:45 PM

You would be well served by checking the vent air speed at "full power". I suspect that even two 4" ports will not be enough for two 15" woofers tuned to 22Hz. It does depend on the box size too, so you have to model it. You want to keep max velocity below about 17m/s (55 ft/s) to keep port compression and turbulence noise tolerable.

Also, you should check for port self-resonances. The only program that I know that does this is Unibox. Google and download it if you do not have it.

These are the two most common things that are overlooked in vented box subwoofer design, in my opinion.

-Charlie

hooligan72 · 8th March 2011, 10:49 PM

Thanks for the response.

There will only be 1 15" Dayton. I could go to 6" if nessesary but I thought 2 4" would be enough.

I have tried to download Unibox but have had difficulty with that. I'll try it again.

Any other tips?

4th March 2011, 03:22 PM	#1
hooligan72 diyAudio Member Join Date: Jun 2010	Review my subwoofer design please Please take a look at this subwoofer design. Any feedback would be appreciated. Thanks. It will use: Dayton classic 15" 295-470 Bash 300 or Bash 500 plate amp The box will be vented 9 cu ft net Two 17" flared ports Bassbox pro and winisd show show a pretty flat response with F3 at about 22hz Dayton classic 15 19hz.png The sub will be front firing and vents will be side firing into the remaining space of a recessed opening in a concrete wall. Thanks in advance

8th March 2011, 10:45 PM	#9
CharlieLaub diyAudio Member Join Date: Mar 2007 Location: California	a few things to check... You would be well served by checking the vent air speed at "full power". I suspect that even two 4" ports will not be enough for two 15" woofers tuned to 22Hz. It does depend on the box size too, so you have to model it. You want to keep max velocity below about 17m/s (55 ft/s) to keep port compression and turbulence noise tolerable. Also, you should check for port self-resonances. The only program that I know that does this is Unibox. Google and download it if you do not have it. These are the two most common things that are overlooked in vented box subwoofer design, in my opinion. -Charlie

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5th March 2011, 09:04 PM	#2
seanny diyAudio Member Join Date: Oct 2008	You need a X brace like Earl's. What is the diameter of those ports?

5th March 2011, 10:42 PM	#3
hooligan72 diyAudio Member Join Date: Jun 2010	The vents are the 4" flared from PE. I thought that two 4" vents would be large enough to avoid chuffing. I haven't finalized the bracing yet. If you can provide a link to Earls design I would love to have a look at it. I can always recalculate volume to reflect different bracing. Thanks in advance.

7th March 2011, 01:49 PM	#5
hooligan72 diyAudio Member Join Date: Jun 2010	I think we're looking at the same woofer. Did you mean to post a different link?

7th March 2011, 02:02 PM	#6
hooligan72 diyAudio Member Join Date: Jun 2010	I think I found the one you're talking about. 295-206? Qts 0.43 Vas difference is huge. I'll have to remodel.

7th March 2011, 11:08 PM	#7
seanny diyAudio Member Join Date: Oct 2008	I can't find that picture anymore.

8th March 2011, 10:28 PM	#8
hooligan72 diyAudio Member Join Date: Jun 2010	Dayton Audio DCS385-4 15" Classic Subwoofer 4 Ohm Is this the one? Also, I tried doing a search for Earl to check out his design. Can you post a link?

8th March 2011, 10:49 PM	#10
hooligan72 diyAudio Member Join Date: Jun 2010	Thanks for the response. There will only be 1 15" Dayton. I could go to 6" if nessesary but I thought 2 4" would be enough. I have tried to download Unibox but have had difficulty with that. I'll try it again. Any other tips?

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