best subwoofer for a 20 litre ported enclosure?

[Bill poster]

Spent days(!) researching the best sub for a 15 to 22 litre enclosure. Using WinISD. Want low, clean, tight bass, f3 of 30 hz or below if possible, 85 db/ 1M minimum. Hopefully this list could help anyone looking for something similar so please add any suggestions

shortlist so far

10" Dayton Titanic III

10" TC Epic

10 " RE Audio SRX

12" DIYMA reference

 

[Bill poster]

8" Elemental e3.8 (f3 35 hz 17 litres)

 

[Cokewithlime]

There is no such thing as best - lol, but this Tang Band W8-1363B 8 inch Subwoofer will get you a solid f3 of around 30Hz and a f10 of about 23Hz in just a 17l ported enclosure

 

[Bill poster]

I know, 'best' is not really the right word jeez are those figures right?

 

[sreten]

Hi,

The basic rules are simple, for a given box size, the lower the real sensitivity
the better the bass extension. For 15L to 22L vented your looking at an 8"
driver, most 10" would only work well with sealed in that range.
TBH 10"sealed with a bit of low EQ might be your best bet.

You need a better simulator than WinISDbeta for final design,
and anyway always use two to crosscheck the final design.

rgds, sreten.

 

[toref]

Hi,
You need a better simulator than WinISDbeta for final design,
and anyway always use two to crosscheck the final design.

rgds, sreten.

Sorry if OT, but I'm curious. What do you find limiting with WinISD beta w.r.t. simulation? Which is the "preferred" SW for this?

Regards, Tor

 

[Bill poster]

SB acoustics SW26 10"
optimum volume is VERY low on the 4 ohm - (12 litre) but i don't understand the 8 ohm specs, very different, don't make sense when inputed on winisd

https://www.madisound.com/store/product_info.php?cPath=45_338_340&products_id=8682

 

[Bill poster]

https://www.madisound.com/store/manuals/SW26DAC76-4.pdf scroll down

ok I made a mistake, it works now- the 8 ohm in a 15 litre BR measures around 34 hz (F3) and F6 of 28 hz. Pretty impressive.

edit madisound have got different specs to the SB website. sensitvity is 82 not 86!!

 

[sreten]

Sorry if OT, but I'm curious. What do you find limiting with WinISD beta w.r.t. simulation? Which is the "preferred" SW for this?

Regards, Tor

Hi,

WinISDpro is better as it allows you cross check published parameters
and model excursion limits, powerhandling limits etc. Other sims are
better at modelling e.g. stuffing and flared ports (I think).

I use WinISDbeta for quick sims, WIONISDpro for more detailed
analysis but I would cross check that in another sim for a final
design. The FRD tools site has Unibox and a Bass box designer,
I don't know them very well, but they some have nice features.

rgds, sreten.

 

[sreten]

https://www.madisound.com/store/manuals/SW26DAC76-4.pdf scroll down

ok I made a mistake, it works now- the 8 ohm in a 15 litre BR measures around 34 hz (F3) and F6 of 28 hz. Pretty impressive.

edit madisound have got different specs to the SB website. sensitvity is 82 not 86!!

Hi,

I don't understand how you can arrive at a 15L vented box for that driver.
For 15L sealed box Q is around 1, you cannot effectively vent Qb=1.
Qts of 0.52 means sealed for a compact box, with Vas of 44L, that
indicates around 30L(1cuft) sealed (and well stuffed) will get you
near the classic Butterworth Qb=0.7 alignment, just above in Q.
I'm fairly certain its intented use is 1cuft well stuffed sealed.

For vented around 60L (2cuft) tuned very low (18/20Hz) is what i get.


edit : sorry I've used the wrong driver data ........
Ok ... Fs 20Hz, Qts 0.27, Vas 46L .....
Yes that does make sense in a 15L box.
But note with such a small box the vent size will be so difficult
to dimension your will be forced to go with one or two PR's.

rgds, sreten.

 

[Cokewithlime]

I know, 'best' is not really the right word jeez are those figures right?

Yes, those figures are correct for that TB 8" neo driver - this is a EBS(extended bass self) alignment. The Neo TB driver like a fairly small box and you can drive the TB to it's max power rating(150W) and it still leaves a comfortable margin before exceeding xmax. There is even some xmax headroom should you decide to add some low end EQ.

I have used these TB driver several time when I have to deal with designing space constrained sub enclosures and they work very well - they are a bit expensive, but get the job done.

 

[Bill poster]

Yes that does make sense in a 15L box.
But note with such a small box the vent size will be so difficult
to dimension your will be forced to go with one or two PR's.

rgds, sreten.

Yeah I think there are two specs on madisound site, one makes no sense at all. I sent an email to SB to ask about the sensitivity, not sure if madisound have their own measurements for that driver etc.
With a PR, will it increase output per watt and how to work out the volume?

cheers

 

[Bill poster]

Yes that does make sense in a 15L box.
But note with such a small box the vent size will be so difficult
to dimension your will be forced to go with one or two PR's.

rgds, sreten.

Yeah I think there are two specs on madisound site, one makes no sense at all. I sent an email to SB to ask about the sensitivity, not sure if madisound have their own measurements for that driver etc.
With a PR, will it increase output per watt and how to work out the volume?

cheers

 

[Bill poster]

best so far? aluminium cone/ cast chassis, 10 inch, 600 w- in a 17 litre it plots 34 hz f3 , 29 hz f6 Dayton Audio - RSS265HO-4 Reference Series

 

[mayhem13]

But how do you fit the 30 inch long by 4" diameter port into the 17L enclosure? Or what about the 6L of volume displaced by the port?.

 

[Bill poster]

But how do you fit the 30 inch long by 4" diameter port into the 17L enclosure? Or what about the 6L of volume displaced by the port?.

The port length isnt an issue, the enclosure will be a corian sphere 'ufo' shape; I can run the port inside the outer circumference.

Port.. just imagining 6 large bottles of mineral water .. 4" is that right?

 

[Bill poster]

with the Dayton rs ho's when I calculate using 2 different programs I'm getting a 3 inch dia. port length of -1.170 inches, 4 inch diameter is -1.1.
2 ports, 2.75 inches diameter = -0.28

The numbers don't mean anything to me lol.. does -1.1 = 1 foot 1 inch long?

 

[Cokewithlime]

If you are getting a negative (-) number on your port length it probably mean that you have entered the driver parameters incorrectly into the sim programs or have used the wrong measurement units when you entered the parameters.

 

[Bill poster]

If you are getting a negative (-) number on your port length it probably mean that you have entered the driver parameters incorrectly into the sim programs or have used the wrong measurement units when you entered the parameters.

dunno but its driving me bonkers what am i doing wrong? 33 hz, 17 ft box
Port Length Calculator

 

[Cokewithlime]

That calculator only accepts enclosure volume in cu ft - you probably entered 17 (liters) without first converting to cu ft - lol

Also it is a fairly useless calculator since it won't predict port air velocity - a very important figure when determining the choice of port sizing