have a limited space for an outdoor sub (garden),
so box size can be:
W - 10 to 11" (25-28 cm)
H - 20 to 28" (50-70 cm)
L - 17 - 22" (45-52 cm)
front are JBL control 29 ,
Amplifier crown xti 1000 or similar .
I have Morel Ultimo 12" (4ohm) which I'm thinking to use in a slot loaded configuration ,
Morel Ultimo TI SC124 Ultimo Titanium SC Series 12" 4-ohm component subwoofer at Crutchfield
https://pdf.crutchfieldonline.com/ImageBank/v20160721090200/Manuals/210/210ULTT104.PDF
They recommended on 45 liter in sealed box.
I plan the box as slot loaded where the sealed box is ~45 liter ,
I draw 2 sketches(attached):
1.Simple - The driver installed in 45 liter and slot
2.following @weltersys - the slot depth is close to the diameter size of the driver.
Questions :
1.Is the Morel Ultimo will work well in slot loaded? Is it a good driver in this setup/purpose?
2.for the design - Which one will work better?
any other idea or tip is highly welcome .
3.for both design does it matter if I install the driver in center of the board (see D1 image) or higher as in D2?
3.Should i also add rock wool to the sealed box?
so box size can be:
W - 10 to 11" (25-28 cm)
H - 20 to 28" (50-70 cm)
L - 17 - 22" (45-52 cm)
front are JBL control 29 ,
Amplifier crown xti 1000 or similar .
I have Morel Ultimo 12" (4ohm) which I'm thinking to use in a slot loaded configuration ,
Morel Ultimo TI SC124 Ultimo Titanium SC Series 12" 4-ohm component subwoofer at Crutchfield
https://pdf.crutchfieldonline.com/ImageBank/v20160721090200/Manuals/210/210ULTT104.PDF
They recommended on 45 liter in sealed box.
I plan the box as slot loaded where the sealed box is ~45 liter ,
I draw 2 sketches(attached):
1.Simple - The driver installed in 45 liter and slot
2.following @weltersys - the slot depth is close to the diameter size of the driver.
Questions :
1.Is the Morel Ultimo will work well in slot loaded? Is it a good driver in this setup/purpose?
2.for the design - Which one will work better?
any other idea or tip is highly welcome .
3.for both design does it matter if I install the driver in center of the board (see D1 image) or higher as in D2?
3.Should i also add rock wool to the sealed box?
Attachments
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Since the volume of the slot plenum reduces cabinet volume, and reducing cabinet volume reduces low frequency sensitivity, the slot plenum's depth, height and width normally would be as small as possible.
1)All drivers "work well" slot loaded, but the slot will cause an upper frequency range boost, the frequency range dependent on depth, volume and area of the plenum.
A sealed sub's output is limited by it's displacement, and it's low frequency sensitivity is lessened by reducing cabinet volume.
With only 9.5mm Xmax, and an advertised price of $700, the Morel Ultimo has a very poor $/displacement ratio.
2, 3) There would be almost no difference between the two.
4)Rock wool can increase the apparent volume of a sealed box slightly.
Compared to the ported options (which would not benefit from rock wool) going sealed would give up 6dB sensitivity over much of the bass range, requiring four times the power for similar output.
Art
Attachments
Thanks weltersys !
for Xmax I understand this parameter by itself doesn't really mean too much but it depends on other parameters and some other saying Fs can tell more for low end output,is that correct?
Do u think i should buy other one?
feeel strange this would be a bad driver as Morel Ultimo supposed to be a hi end driver ...
For the box size , I follow the spec and set the sealed box to optimum (~45 liters ) + slot width of ~9 cm , I can narrow the slot width and gain larger cabinet but it will be bigger than 45 liters , is that what you recommend?
If you can assist with box size , I can do the requirement adjustments in drawing and upload it here for a review.
thanks!
Xmax multiplied by Sd determines displacement, the piston (cone) must move (displace) air to make sound, the more displacement, the more sound pressure generated. Lower frequencies require more displacement to equal upper frequency SPL.
The Fs is the free-air resonance of the driver. It is one of many parameters that will affect the shape of the response of the driver when put in a box.
The Morel Ultimo is very expensive for a stamped steel frame driver with relatively low displacement.
For outdoor use, I would not recommend a single relatively low displacement 12" in a small sealed box, it won't match the SPL of your JBL Control 29 down low.
The ported alignment could- look at the difference between the two in the attachment included in post #2.
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sorry got little confused with theoretical stuff ,
for the Ultimo - ok I understand better go with other driver as the eminence lab12 ,
for the box, maybe I didn't understand correctly but ur recommendation was for the box size I have better to go with slot loaded than horn tapped ,
now for the box - for the lab12 , is the drawing I upload here descring a slot loaded as u recommended?
actually start to think I didn't get your point at all and maybe the box I drew is not what you meant
I understand it is a box which divided to 2 (logically ),the cabinet with the 12 driver installed in a sealed box,firing into smaller cabinet with front slot , with no isolation like whool ,where the maximum depth I can create for it would be better ?I can make the slot thin as 1 inch )
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My recommendation was slot loaded, with a bass reflex port, using the maximum volume available in your space/volume restriction. The small volume you have to work with won't work well for a TH with low frequency extension below your JBL Control 29s.
The drawing you posted is slot loaded, sealed, with a slot larger than needed- 12" by 12" by around 2" would be sufficient, 1" might be a little restrictive and cause wind noise at high displacement.
The drawing you posted is slot loaded, sealed, with a slot larger than needed- 12" by 12" by around 2" would be sufficient, 1" might be a little restrictive and cause wind noise at high displacement.
It would help if you could elaborate in a bit more detail about the placement of the subwoofer. It seems that you have some kind of confined space, into which you want to place the sub. What kind of material will be around it? Is it inside a wall, or a cabinet, or something else?
You could also think about alternative cabinet shapes.
If the enclosure will be placed in a recess in a stone structure for example, you dont need to build a cab with a slot. Just build a normal box with side-mounted driver, that is less wide than the place where you will put it.
You could make it with a trapezoidal footprint to maximize internal volume.
Thanks weltersys ,
the following changes to the plan done:
Narrow the slot width to 2 inch
Hight and depth - as closest to the woofer size (~30 cm) .
Adjust total box size to get to ~45 liter (excluding slot size)
for bass reflex - as sketch , I draw a 2" by 5" as vent cut ,
or can buy some tube .
The cabinet now is ~45 liters (minus the slot size ) ,
In case needed - I can increase it easily by change the box H from 20" to max of 28" .
for Bass reflex - please advise for type(cut/tube , port size/port location)?
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Thanks bob4 ,
That's correct ,
I have very limited space for installing the subwoofer:
W - 10 to 11" (25-28 cm)
H - 20 to 28" (50-70 cm)
L - 17 - 22" (45-52 cm)
see pictures:
I'd like to use the space between an outdoor kitchen and metal/stone grill ,
The back there a wall ,
see attached for more details , note in the zoom out picture i hide the grill ,
I can upload real picture of the place , but it actually identical to the drawing as I built everything you see based on this drawing .
Any suggestions/plans are highly welcome ,
Attachments
As Bob4 mentioned, a normal box with side-mounted drive will work fine, though the cabinets on the side the speaker faces will tend to rattle more than if using a slot.
Port location can be anywhere convenient, though for outdoor use you will want it covered with grill cloth to avoid critters nesting inside.
Port size for a long throw subwoofer should be large to avoid turbulent noise.
The bass reflex cabinet should be larger than 45 liters net unless you are going for a high tuning frequency.
90 liters net would be good for a LAB12 with an Fb (and F3) of 25Hz, using two 3" diameter vents with 16.25" length.
Dropping down to around 65 liters net, you may be more happy with a higher Fb, with a little more "boom", two 3.5" diameter vents with 12.44" length gives you a 38Hz Fb (33Hz F3). You could extend the ports for a lower Fb with flatter response.
Anyway, go for the maximum box size, let the grill provide the heat ;^).
Art