H/R118 by Startec |
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adriansala
New Member Joined: 21 January 2021 Location: argentina Status: Offline Points: 1 |
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Posted: 22 February 2021 at 7:01am |
Hello and thank you for sharing all this knowledge, I am eager to build this design, although my speaker is not the right one for this box, but I would like to know if someone can help me modify what is necessary so that it works as well as possible in this box , is an EMINENCE Sigma-Pro 18A-2 DE 650w-RMS. This is the Thielle-Small. By the way Luthier I would love to be able to see those solidworks files to have them in my possession and better appreciate the work. Thank you very much in advance and the design of this Box is Beautiful. Successes !!! Characteristics -Product Type: Speaker Chassis -Type: PA -Nominal diameter: 18 " -Nominal diameter: 457.2 mm -Coil: 3 " -Coil: 76.2 mm -Total diameter: 457.2 mm -Mounting hole diameter: 438.2mm -Nominal diameter: 420.5 mm -Mounting holes diameter: 7.1mm -Depth: 207 mm -Nominal impedance: 8 Ohm (s) -Rated power (filter): 650 W -Maximum power: 1300W -Sensitivity (1 W at 1 m): 99 dB -Frequency response: 41 - 2400 Hz -Coil material: Copper -Magnet: Ferrite -Depth between iron: 9.53 mm Thiele-Small parameters -Fs (resonant frequency): 28 Hz -Re (continuous resistance): 6.29 Ohm (s) -Qms (mechanical Q factor): 8.28 -Le (coil inductance): 1.9 mH -Qes (electrical Q factor): 0.3 -Qts (total Q factor): 0.29 -Vas (equivalent air volume): 441.2 -Mms (moving mass): 130 g -BL (power factor): 22.1 teslas / m -Xmax (max. Linear excursion): 6.1 mm -Cms (mechanical compliance of the suspension): 0.24 mm / N -Sd (cone surface): 1140 cm² -Weight: 11,685 kg. https://www.eminence.com/speakers/speaker-detail/?model=Sigma_Pro_18A_2
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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So I drew up the h/r118 in solidworks a few years ago and just came across the files. If anyone want's them let me know? :) |
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 513 |
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Hi, Can you post your HR horn inputs. I am still trying to get more low bass out of this design. Thanx.
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 513 |
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Interesting......
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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You can get down to 30hz but the efficiency starts to drop dramatically. Max output is compromised as well.
18HP1060 standard vs 10cm higher tuned to 30hz (standard is black) 18HP1060 standard vs 10cm higher tuned to 30hz max output(standard is black) |
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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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My only concern would be that it may also lessen the maximum output by running out of xmax early.
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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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I was considering extending the front approximately 4 inches. It wouldn't give much in the way of added internal volume but it would extend and increase the size of the horn some.
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The member formally known as vwbidder.
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 513 |
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Add 10 cm (4 inch) to H. Moving the door and port up. This would add more than a cubic foot of air space. Adjust port L and try 40/35/30 Hz fb . Would this increase low bass output?
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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how would you do that?
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 513 |
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Will increasing rear chamber size increase 30-45 Hz out put? How much?
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SonicXtasy
Young Croc Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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I have some Faital Pro 18HP1060's that model the same as the RCF LF18N401's that it was designed around. They actually has a slightly higher output due to higher xmax. The size and weight of this cab seem manageable, it can be used in singles and its efficiency and output seem to be as high as most other cabs in this size range. It seems to be the perfect cabinet except that I would like it to go a little lower. The current tuning appears to be around 40hz. I have modeled it in hornresp as it is and with the port tuned to 35hz. Tuned to 35hz the efficiency at 40hz drops a few db and it runs out of xmax a little sooner but otherwise still seems to be a very competent cabinet. Other than the 2 noted compromises are there any other issues with the lower cabinet tuning that I am missing?
18HP1060 VS LF18N401 18HP1060 VS LF18N401 Maximum output (1060 is black) Standard vs 35hz tuning (1060) Standard vs 35hz tuning Maximum output(1060) |
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The member formally known as vwbidder.
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Mark James
Old Croc Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309 |
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have you simmed other drivers in?
i wouldnt worry about the excursion being all over the place just within limits in the pass band tbh input parameters you are using?
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me so horny me love you long throw
horn loaded for her pleasure |
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