Hi,I'm trying to get some parameters on my woofer and cabinet but every program i use,either something is missing or a its missing a spec.Drives me nuts!
12" WooferRSS315HFA
-8
and my box is a 20" cube.What i want to know is if its a sealed box instead of a ported box what will happen?
Power Handling (RMS) 350 Watts Power Handling (max) 700 Watts Impedance 8 ohms Frequency Response 25 to 1,500 Hz Sensitivity 84.5 dB 1W/1m Voice Coil Diameter 2.5"
THIELE-SMALL PARAMETERS Resonant Frequency (Fs) 25 Hz DC Resistance (Re) 6.45 ohms Voice Coil Inductance (Le) 1.60 mH Mechanical Q (Qms) 2.94 Electromagnetic Q (Qes) 0.64 Total Q (Qts) 0.53 Compliance Equivalent Volume (Vas) 2.67 ft.³ Mechanical Compliance of Suspension (Cms) 0.21 mm/N BL Product (BL) 17.5 Tm Diaphragm Mass Inc. Airload (Mms) 195.2g Maximum Linear Excursion (Xmax) 14 mm Surface Area of Cone (Sd) 506.7 cm²
MATERIALS OF CONSTRUCTION Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite
MOUNTING INFORMATION Overall Outside Diameter 12.36" Baffle Cutout Diameter 11.10" Depth 5.75" # Mounting Holes 8
OPTIMUM CABINET SIZE * Sealed Volume 1.54 ft.³ Sealed F3 40 Hz Vented Volume 4.63 ft.³ Vented F3 20 Hz * Enclosure volume/F3s based on BassBox "optimum" calculations - thank you
12" WooferRSS315HFA
-8
and my box is a 20" cube.What i want to know is if its a sealed box instead of a ported box what will happen?
Power Handling (RMS) 350 Watts Power Handling (max) 700 Watts Impedance 8 ohms Frequency Response 25 to 1,500 Hz Sensitivity 84.5 dB 1W/1m Voice Coil Diameter 2.5"
THIELE-SMALL PARAMETERS Resonant Frequency (Fs) 25 Hz DC Resistance (Re) 6.45 ohms Voice Coil Inductance (Le) 1.60 mH Mechanical Q (Qms) 2.94 Electromagnetic Q (Qes) 0.64 Total Q (Qts) 0.53 Compliance Equivalent Volume (Vas) 2.67 ft.³ Mechanical Compliance of Suspension (Cms) 0.21 mm/N BL Product (BL) 17.5 Tm Diaphragm Mass Inc. Airload (Mms) 195.2g Maximum Linear Excursion (Xmax) 14 mm Surface Area of Cone (Sd) 506.7 cm²
MATERIALS OF CONSTRUCTION Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite
MOUNTING INFORMATION Overall Outside Diameter 12.36" Baffle Cutout Diameter 11.10" Depth 5.75" # Mounting Holes 8
OPTIMUM CABINET SIZE * Sealed Volume 1.54 ft.³ Sealed F3 40 Hz Vented Volume 4.63 ft.³ Vented F3 20 Hz * Enclosure volume/F3s based on BassBox "optimum" calculations - thank you
Hi,
At a very basic level all you need is Fs, Qts and Vas
and plug those values into WinISD. Your box is
3 cuft if they are external, fine for sealed.
With a Qts of 0.53 you'll be fine with a
sealed and stuffed box ~ = to Vas.
You will be very near just under Qbox = 0.7 with Fbox just
under 1.4 x Fs and a -3dB point of about 1.4 x Fs. Optimum
stuffing can lower these numbers somewhat but not a lot.
rgds, sreten.
Sealed boxes are very forgiving, here 3cuft will be fine.
At a very basic level all you need is Fs, Qts and Vas
and plug those values into WinISD. Your box is
3 cuft if they are external, fine for sealed.
With a Qts of 0.53 you'll be fine with a
sealed and stuffed box ~ = to Vas.
You will be very near just under Qbox = 0.7 with Fbox just
under 1.4 x Fs and a -3dB point of about 1.4 x Fs. Optimum
stuffing can lower these numbers somewhat but not a lot.
rgds, sreten.
Sealed boxes are very forgiving, here 3cuft will be fine.
thanks guys.I really appreciate and thanks for all the work bjorno. that was perfect!
http://www.diyaudio.com/forums/members/bjorno.html
http://www.diyaudio.com/forums/members/bjorno.html
The box can be changed at this point.What do you think the "optimum box size" would be for this driver for a , punchy sound?
Others feel free to chime in.I'm only able to do cubes and unable to convert vol to actual box sizes.
Last edited:
Hi,
Optimum box size is about 3 cuft sealed and well stuffed.
Internally that is 17"x17"x17" as a cube = ~ 5000 cu ins.
So you could have 12.5"x20"x20" or any 3 numbers
(e.g. 14x17x20) that multiply to ~ 5000 in inches.
The driver Q indicates the punchiest your going to get
is the above in any sensibly sized box related to Vas.
rgds, sreten.
Optimum box size is about 3 cuft sealed and well stuffed.
Internally that is 17"x17"x17" as a cube = ~ 5000 cu ins.
So you could have 12.5"x20"x20" or any 3 numbers
(e.g. 14x17x20) that multiply to ~ 5000 in inches.
The driver Q indicates the punchiest your going to get
is the above in any sensibly sized box related to Vas.
rgds, sreten.
I now have a friend who could help build a 4th order band-pass but i would need someone to design it
or if i can find a plan.There is no way i can design a cab,i just don't have the experience.
Help is greatly appreciated.The wood i have is 15MM bamboo ply.It will be cut at a CNC cutter.
Hi again,basically the Tl is not happening now because the size of panels wouldn't fit into the sheets i bought
So i"m looking at a fourth order now,or going with the sealed box.I'm looking into designs now.
Do you think that this sub box would work with my sub?
http://www.youtube.com/watch?v=9QdAzM_c33U&feature=youtu.be
What do you think of a single band pass?
Thanks for the help GM!
Last edited:
Passive Radiator...... the vent needs to be so long to have a low power compression that it will have audible pipe organ harmonics 'singing' along to 'color' its response, so a large, high excursion 'driver' is required and ideally two should be used in a bipolar layout to ~cancel out their high excursion vibration modes.
GM
GM
hey Down Under!
Reading what you posted, I don't think you should make a band pass. It will most likely sound boomy, as that is the nature of band pass.
Sealed is generally a safe bet, especially for higher Q drivers.
Ported can still work but you need a big cabinet tuned very low meaning big and long ports or a shelf port. without calculating, I don't think that really fits your 20" cube.
Reading what you posted, I don't think you should make a band pass. It will most likely sound boomy, as that is the nature of band pass.
Sealed is generally a safe bet, especially for higher Q drivers.
Ported can still work but you need a big cabinet tuned very low meaning big and long ports or a shelf port. without calculating, I don't think that really fits your 20" cube.
Dayton Audio RSS315HFA-8 12"
The 4th order bandpass will give you essentially more output in the sub LF <50Hz region (40Hz 30Hz and 20's Hz).
For that you will need to build an enclosure that will be V1 = 36.5 L and V2 = 24.5 L with a total (net) of 61 L + port dimensions.
61L = 2.15ft³
The 4th order bandpass will give you essentially more output in the sub LF <50Hz region (40Hz 30Hz and 20's Hz).
For that you will need to build an enclosure that will be V1 = 36.5 L and V2 = 24.5 L with a total (net) of 61 L + port dimensions.
61L = 2.15ft³
Attachments
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.