Solid 35hz in 4 cu ft |
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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When entering data of a driver that has a Qts lower than .312 (.27 for example) into WinISD that I want to model as a B6, do I enter the correct Qts or do I enter it as .312? Meaning I would have 2 database's for one driver, one for standard alignments and one just for B6.
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The member formally known as vwbidder.
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Also, I assume the D2 alignment is a Q of.707?
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The member formally known as vwbidder.
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Can I use the Q=2 high pass trick on a normal SBB4 alignment? I have modeled the Faital Pro 10HP1060 4 ohm and it's SBB4 alignment is 2.9 cu ft tuned to 34.75hz. When I add the peaking HP I get a beautifully flat response.
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The member formally known as vwbidder.
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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D2 is a Qtc of 0.5 (IIRC).
Faital Pro 10HP1060, no data found, even at Faital Pro. "Can I use the Q=2 high pass trick on a normal SBB4 alignment?" Only when the Qts is 0.312, for other values of Qts the Faux frequency and Q will need to be adjusted, and the result will be a C6 (with a small amount of ripple). "When entering data of a driver that has a Qts lower than .312 (.27 for example) into WinISD that I want to model as a B6, do I enter the correct Qts or do I enter it as .312? Meaning I would have 2 database's for one driver, one for standard alignments and one just for B6." The assumed higher Qts 'trick' may be done with any alignment, not just a B6 (C6). Speaker sims are based on small signal behavior, not with any real power applied. Edited by _djk_ - 29 August 2013 at 1:44pm |
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djk
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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An interesting inexpensive design:
Driver Properties Name: Sigma Pro 18A-2 Type: Standard one-way driver Company: Eminence Speaker LLC No. of Drivers = 1 Fs = 28 Hz Qms = 8.28 Vas = 441.2 liters Cms = 0.239 mm/N Mms = 135.2 g Rms = 2.872 kg/s Xmax = 6.1 mm Xmech = 18 mm P-Dia = 381 mm Sd = 1140 sq.cm P-Vd = 0.695 liters Qes = 0.3 Re = 6.29 ohms Le = 1.9 mH Z = 8 ohms BL = 22.1 Tm Pe = 650 watts Qts = 0.29 no = 3.113 % 1-W SPL = 97.08 dB 2.83-V SPL = 98.12 dB ----------------------------------------- Box Properties Name: Type: Vented Box w/ Active HP Filter Shape: Prism, square (optimum) Vb = 3.5 cu.ft Fb = 38 Hz QL = 6.099 F3 = 38.08 Hz Fill = minimal No. of Vents = 2 Vent shape = rectangle Vent ends = one flush Hv = 10.87 in Wv = 2.5 in Lv = 25.3 in ----------------------------------------- Active 12 dB/oct. HP Filter Fx = 38 Hz Qx = 1.93 ************************* The port could be made smaller, the x-max isn't that huge. Minimum recommended No. of Vents = 1 Vent shape = other Vent ends = one flush Av = 32.77 sq.in Lv = 11.71 in Edited by _djk_ - 29 August 2013 at 4:42pm |
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djk
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Here is the link to the Faital Pro 18HP1016 4 ohm. Please sim it and see what you think. I like Eminence but have had bad luck with the Sigma and Kilomax 18's and therefore avoid them.
Edited by SonicXtasy - 30 August 2013 at 11:38am |
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The member formally known as vwbidder.
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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Driver Properties
Name: 18HP1060 Type: Standard one-way driver Company: Faital Pro No. of Drivers = 1 Fs = 35 Hz Qms = 11.1 Vas = 175 liters Cms = 0.0975 mm/N Mms = 212 g Rms = 4.2 kg/s Xmax = 11.45 mm Xmech = 21 mm P-Dia = 378.3 mm Sd = 1124 sq.cm P-Vd = 1.287 liters Qes = 0.38 Re = 5 ohms Le = 1.26 mH Z = 8 ohms BL = 24.77 Tm Pe = 1200 watts Qts = 0.367 no = 1.904 % 1-W SPL = 94.94 dB 2.83-V SPL = 96.98 dB ----------------------------------------- Box Properties Name: Type: Vented Box w/ Active HP Filter Shape: Prism, square Vb = 3.5 cu.ft Fb = 35 Hz QL = 6.505 F3 = 35.13 Hz Fill = minimal No. of Vents = 1 Vent shape = other Vent ends = one flush Av = 50 sq.in Lv = 24.71 in ------------------------------------ Active 12 dB/oct. HP Filter Fx = 35 Hz Qx = 1.5 ***************************** Takes about 2KW to hit x-max, Q=1.5 is only a max boost of 3.5dB |
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djk
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Thanks djk, the 18HP1060 8 ohm (whats above) is probably what I am going to go with. When I simmed it in WinISD I got a volume of 3.717l but I may have input the data wrong, I will double check. Either way they fit my goal. I was planning on using triangle ports at the 4 corners of the cab. I have been simming them as two 4" square ports but in reality they will be cut in half. Same total area, just spread across more ports, is there a problem with simming it like that?
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The member formally known as vwbidder.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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just trying to get my head around what drivers to use for B6 alignment. I need an Fs equal to the target f3, Qts up to 20% below 0.312 so it becomes tuned at high power. apart from that is it better to go for a high Vas for higher efficiency and so that I get a larger box volume (0.4*Vas per driver) and the vent length doesn't become impractically long?
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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this paper seems to discuss B6 as a specific application of a more general approach:
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjX-ej1i5vtAhVfThUIHZEaAbAQFjAKegQIAxAC&url=http%3A%2F%2Fforum.vegalab.ru%2Fattachment.php%3Fattachmentid%3D28510%26d%3D1205526981&usg=AOvVaw176KcC3xlyS5vhERQgez_E |
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