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Old 26th February 2014, 05:14 PM   #1
masliko is offline masliko  Australia
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Default Can i get some help please!

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
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Old 26th February 2014, 05:35 PM   #2
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The Qts is pretty high. If you port your box it will be pretty boomy, you would have to tune it really low, which would mean for practical purposes power handling is not really that much improved from sealed.
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Old 26th February 2014, 06:37 PM   #3
sreten is offline sreten  United Kingdom
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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.
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Old 26th February 2014, 08:39 PM   #4
bjorno is offline bjorno  Sweden
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FYI:

b
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File Type: jpg Dayton_RSS315HFA-8.JPG (885.9 KB, 93 views)
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Old 27th February 2014, 12:23 AM   #5
masliko is offline masliko  Australia
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thanks guys.I really appreciate and thanks for all the work bjorno. that was perfect!


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Old 27th February 2014, 01:52 AM   #6
masliko is offline masliko  Australia
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Quote:
Originally Posted by sreten View Post
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.
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 by masliko; 27th February 2014 at 01:59 AM.
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Old 27th February 2014, 03:42 AM   #7
sreten is offline sreten  United Kingdom
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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.
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Old 27th February 2014, 04:17 AM   #8
GM is offline GM  United States
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One doesn’t normally think of > 0.4 Qts drivers as having a ‘punchy sound’ optimum alignment, at least not in a simple sealed or vented alignment, though one could EQ them to suit.

A 4th order band-pass [BP] or Karlson K15 cab would be more appropriate.

GM
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Old 27th February 2014, 08:47 AM   #9
masliko is offline masliko  Australia
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Quote:
Originally Posted by GM View Post
One doesn’t normally think of > 0.4 Qts drivers as having a ‘punchy sound’ optimum alignment, at least not in a simple sealed or vented alignment, though one could EQ them to suit.

A 4th order band-pass [BP] or Karlson K15 cab would be more appropriate.

GM
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.
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Old 27th February 2014, 11:14 AM   #10
masliko is offline masliko  Australia
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Its ok,i have found someone who designed me a t-line looks like it will work well.

thanks for the help.
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