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H/R118 by Startec

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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2016 at 9:43pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote SonicXtasy Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2016 at 10:22pm
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.
The member formally known as vwbidder.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SonicXtasy Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2016 at 10:23pm
My only concern would be that it may also lessen the maximum output by running out of xmax early.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SonicXtasy Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2016 at 2:16am
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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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2016 at 10:27pm
Interesting......
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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2016 at 9:43pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote luthier Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2019 at 1:28am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote adriansala Quote  Post ReplyReply Direct Link To This Post 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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