Optimal box for woofer

[nonsuchpro]

Hi all,
By looking at the specs, what would be an optimal size square/rectangle box for this woofer by itself, no other drivers?

Dayton Audio DA270-8 10" Aluminum Cone Woofer

Specifications: • Power handling: 80 watts RMS/160 watts max • VCdia: 1-3/8" • Le: 1.17 mH • Impedance: 8 ohms • Re: 6.3 ohms • Frequency range: 25-6,000 Hz • Fs: 27.8 Hz • SPL: 88.2 dB 1W/1m • Vas: 3.83 cu. ft. • Qms: 1.96 • Qes: 0.55 • Qts: 0.43 • Xmax 6.1 mm • Dimensions: A: 10-5/8", B: 9", C: 4-11/16".

Dayton Audio DA270-8 10" Aluminum Cone Woofer 295-334

Thanks!

[T101]

A cube. Or something as close as possible to a cube.
In a cube, the enclosed air is best attached to the membrane and thus interaction between membrane and enclosed air is best.
This applies only for closed boxes, bass reflex and partially for aperiodic enclosures (damped port leaky sealed boxes).
But this is not an advice derived from the specs, it is a common rule for subwoofers.

This woofer has an EBP (google or wiki for EBP) of 50.5 which suggests that it is better suited for a sealed enclosure. EBP is Effective Bandwidth Product. It is found with Fs/Qes=EBP.

So a cubic sealed enclosure with system Q between 0.55 and 0.707 would be best.

Try and simulate it, in 60L Q=0.59 it returns -10 db@27 hz, which is great for a 50$ driver in an "one hour enclosure" and in 35L Q=0.683 it returns 30 hz @-10 without any anomalies in the response, both enclosures heavily stuffed.

Best Regards!

[nonsuchpro]

Originally Posted by T101

A cube. Or something as close as possible to a cube.
In a cube, the enclosed air is best attached to the membrane and thus interaction between membrane and enclosed air is best.
This applies only for closed boxes, bass reflex and partially for aperiodic enclosures (damped port leaky sealed boxes).
But this is not an advice derived from the specs, it is a common rule for subwoofers.

This woofer has an EBP (google or wiki for EBP) of 50.5 which suggests that it is better suited for a sealed enclosure. EBP is Effective Bandwidth Product. It is found with Fs/Qes=EBP.

So a cubic sealed enclosure with system Q between 0.55 and 0.707 would be best.

Try and simulate it, in 60L Q=0.59 it returns -10 db@27 hz, which is great for a 50$ driver in an "one hour enclosure" and in 35L Q=0.683 it returns 30 hz @-10 without any anomalies in the response, both enclosures heavily stuffed.

Best Regards!

Thanks for the response
I want it to be sealed so that is good news. So what do you think 12x12x12? And will 3/4" MDF be good to use or should it be thinner?

[jacq.]

12*12*12 internal dimentions gives you 28 liters of volume, so you will need to go larger. 14*14*14 = 45liters, 15*15*15 = 60 ltrs. But you coul always go for dim. of 12*12*24 = 60 ltrs or 12*12*18 = 42 ltrs. with the woofer at one extremity.

Jacq.

[Tytte71]

Good advises for you already given by T101.
There is however a little thing I would like to mention in this context.

Be aware that if you are going to use just one woofer (closed cab) the bottom frequency capacitiy is very limited. By this I mean, playing at moderate volume with music containing very low frequency information, you can experience the woofer to reach its maximum stroke range and damage. So I recommend using a subamp with subsonic filter.

Also if you limit the cabinet net volume to let's say 45l and stuff it heavily, you will limit the woofers ability to move as much in the lowest sub frequencies. That will also help with regards to avoiding risk of woofer damage. 45l fully stuffed cabinet will give a Qtc of about 0,65 which is perfectly okay. -3dB@53Hz and -10dB at some 27/28Hz.

When it comes to wall thickness - I will recommend to make it as rigid as possible. 3/4" MDF is fine but I would also make up some internal bracings. If you have the time and are willing to do anything extraordinary, clamp the magnet to a bracing or backwall If you have the money, make several subs

Cheers,

[nonsuchpro]

I doing a set of 3-ways, the mid and tweeter are sealed so I want to put them in their own boxes