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H/R118 by Startec

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adriansala View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote adriansala Quote  Post ReplyReply Direct Link To This Post Topic: H/R118 by Startec
    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 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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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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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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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)



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: 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 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 cravings Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2016 at 7:53pm
how would you do that?
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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 7:34pm
Will increasing rear chamber size increase 30-45 Hz out put? How much?
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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 12:58am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 02 November 2016 at 6:24pm
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?
me so horny me love you long throw
horn loaded for her pleasure
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