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H/R118 by Startec |
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VECTORDJ 
Young Croc 
Joined: 11 June 2006 Location: United States Status: Offline Points: 585 |
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 Posted: 05 December 2016 at 9:43pm |
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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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SonicXtasy
Young Croc
Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Posted: 05 December 2016 at 10:22pm |
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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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SonicXtasy
Young Croc
Joined: 02 February 2008 Location: United States Status: Offline Points: 526 |
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Posted: 05 December 2016 at 10:23pm |
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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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Posted: 06 December 2016 at 2:16am |
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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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VECTORDJ
Young Croc
Joined: 11 June 2006 Location: United States Status: Offline Points: 585 |
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Posted: 06 December 2016 at 10:27pm |
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Interesting......
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VECTORDJ
Young Croc
Joined: 11 June 2006 Location: United States Status: Offline Points: 585 |
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Posted: 28 December 2016 at 9:43pm |
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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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luthier
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Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Posted: 07 February 2019 at 1:28am |
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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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adriansala
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Joined: 21 January 2021 Location: argentina Status: Offline Points: 1 |
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Posted: 22 February 2021 at 7:01am |
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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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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 22 January 2025 at 2:12pm |
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Hi All,
I built 3 cabs with the LF18N401, now im looking into isolation and I would like to get some pointers on this, Which walls should I cover? What stuff would be easy to obtain and is cheapest? I once bought some speaker isolation from Visaton and the piece of foam was so small I would have to rob a bank to line these cabs.  |
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Music!
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bob4
Old Croc 
Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1924 |
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Posted: 22 January 2025 at 7:44pm |
What do you mean? Some material, like a foam or wool to line the walls? It's not really neccesary for a lowpassed subwoofer......
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 22 January 2025 at 9:49pm |
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OK, done
 It was clear I had no clue, could not find much info about it too. Thanks! I've already enjoyed the first test, thanks Startec for sharing the designs
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Music!
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Jan-2T wrote: