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Old 26th January 2013, 05:27 AM   #61
Gost22 is offline Gost22  Bolivia
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Thumbs up Simphony BG-20

Hi all!
See and enjoy!!
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File Type: pdf Simphony BG-20.pdf (598.5 KB, 216 views)
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Old 26th January 2013, 08:54 AM   #62
xrk971 is offline xrk971  United States
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Gost,
The drawing looks good. I think you need to put the polyester wool damping in the closed end between the driver and the 101 mm corner. The damping wool in main space leading to opening is optional and will reduce bass output if desired.
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Old 28th January 2013, 11:42 AM   #63
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by xrk971 View Post
The drawing looks good. I think you need to put the polyester wool damping in the closed end between the driver and the 101 mm corner. The damping wool in main space leading to opening is optional and will reduce bass output if desired.
Hi xrk971!
Around speaker damping streanu see this web page: OrdinaThor_Loudspeakers_TQWT - Tapered Quarter Wave Tube alias Voight pipe - fullrange speakers, horn, high efficiency, tqwt, multiple arrays, general audio topics>, or OrdinaThor_Loudspeakers_TQWT - Tapered Quarter Wave Tube alias Voight pipe - fullrange speakers, horn, high efficiency, tqwt, multiple arrays, general audio topics>
thank you!
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Old 9th May 2013, 11:59 PM   #64
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Hi Guys,
In post #5, GM is recommending a six inch in diameter port, 3/4 of an inch long? Like a six inch hole in 3/4 plywood? Sorry, this just seems large to me, so I wanted to double-check.
Thanks.
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Old 10th May 2013, 02:08 AM   #65
xrk971 is offline xrk971  United States
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That is correct, a 6 inch hole in 3/4 inch baffle is the port. You can also do it with smaller dia and longer but that requires you to have an actual port tube.
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Old 10th May 2013, 05:25 AM   #66
GM is offline GM  United States
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Hmm, reducing the vent area [Av] will tune it lower, ditto making it longer, so for a given tuning, Av must increase if you want to lengthen it.

Since the MLTL is damping the vent enough to allow a large, efficient enough Av at only ~3/4" long, any additional damping due to a larger, longer vent would only be required if playing at high power for extended periods, so basically never in a HIFI/HT app. Worse, at least from a distortion POV is it can potentially 'color' the mids due to its pipe harmonics comb filtering with the driver's output as happens with many Onken alignments.

GM
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Old 10th May 2013, 04:15 PM   #67
xrk971 is offline xrk971  United States
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GM,
You are right, I got that backwards That is good to learn that for HiFi, a shorter vent is preferable for less coloration from pipe harmonics.
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Old 15th January 2014, 03:51 AM   #68
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Question Any information on the Specks

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Originally Posted by Gost22 View Post
Hi all!
See and enjoy!!

I like what is in the PDF is really beautiful, do you have any specks on the output, what is the F3? What does it sound like? Are you happy with what you have? Would you have added a tweeter? What did you do for the crossover?

Did you finish the project?

I just got 2 BG20's and want to build a TL, I have purchased the Mathcad software but have not had time to really learn how to use it.

Thanks,
Golgiapparatus
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