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Re: My 3π adventure [message #95544 is a reply to message #95260]

Wed, 20 April 2022 15:47

ppkstat
Messages: 38
Registered: February 2022

Baron

I have located a knowledgeable cabinet maker here. When I finish with the plans I'll show it to them and hopefully move on from there.

These are sort of tricky to convert to the standards that are being used here. Imperial units have to be converted to metric and they have to be rounded in a way that the internal volume or proportions are not messed up and in a way that the maker can actually construct it with locally available MDF sizes. I've decided to use 19mm MDF which is slightly thicker than the original size (it's closer to 3/4). I will post the completed plans here in order to spot any possible issues before the construction.

However before that there is one area which is especially troublesome to convert and this is the bass reflex port. This 2 1/2in area is impossible to construct with any available MDF sheets here. It might be possible to construct it with a block of thick wood or by combining MDF sheets of various sizes and then probably taking off a millimeter or something but I'll have to discuss this with them. That aside cutting a hole with a diameter of 63.5mm is impossible. With that in mind I had the idea to use a plastic port, specifically this

https://www.monacor.com/products/components/speaker-technology/diy-/mbr-70/

I had the idea to cut this with a saw to an appropriate size by using the tuning frequency (30Hz) and the internal volume of the cabinet which in my calculations ended up being 108cm3. Given that the hole diameter of this is a bit larger than the original (66mm) the length should be around 57.4mm(2.26in). I don't know if I'm even able to cut it to this exact size and I don't trust my calculations at all!

I really don't know what's the best solution here. Maybe someone has constructed the port in metric before?

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[Message index]

		My 3π adventure By: ppkstat on Fri, 18 February 2022 19:13
		Re: My 3π adventure By: Wayne Parham on Sat, 19 February 2022 10:45
		Re: My 3π adventure By: ppkstat on Fri, 25 February 2022 18:27
		Re: My 3π adventure By: Wayne Parham on Fri, 25 February 2022 18:52
		Re: My 3π adventure By: ppkstat on Thu, 10 March 2022 17:47
		Re: My 3π adventure By: Wayne Parham on Thu, 10 March 2022 18:52
		Re: My 3π adventure By: ppkstat on Tue, 15 March 2022 12:39
		Re: My 3π adventure By: Rusty on Tue, 15 March 2022 13:42
		Re: My 3π adventure By: ppkstat on Tue, 15 March 2022 14:16
		Re: My 3π adventure By: Rusty on Tue, 15 March 2022 14:38
		Re: My 3π adventure By: Wayne Parham on Tue, 15 March 2022 14:40
		Re: My 3π adventure By: ppkstat on Wed, 23 March 2022 11:21
		Re: My 3π adventure By: ppkstat on Thu, 24 March 2022 08:53
		Re: My 3π adventure By: Wayne Parham on Thu, 24 March 2022 09:49
		Re: My 3π adventure By: hudelson2 on Sat, 30 April 2022 13:30
		Re: My 3π adventure By: ppkstat on Sat, 30 April 2022 14:03
		Re: My 3π adventure By: Wayne Parham on Sat, 30 April 2022 16:31
		Re: My 3π adventure By: ppkstat on Sat, 30 April 2022 17:00
		Re: My 3π adventure By: ppkstat on Tue, 19 April 2022 09:16
		Re: My 3π adventure By: Wayne Parham on Tue, 19 April 2022 09:49
		Re: My 3π adventure By: ppkstat on Tue, 19 April 2022 10:06
		Re: My 3π adventure By: Wayne Parham on Wed, 20 April 2022 08:05
		Re: My 3π adventure By: ppkstat on Wed, 20 April 2022 15:47
		Re: My 3π adventure By: Wayne Parham on Wed, 20 April 2022 16:15
		Re: My 3π adventure By: ppkstat on Sat, 07 May 2022 21:02
		Re: My 3π adventure By: ppkstat on Mon, 09 May 2022 19:30
		Re: My 3π adventure By: ppkstat on Tue, 10 May 2022 14:36
		Re: My 3π adventure By: Wayne Parham on Tue, 10 May 2022 15:58
		Re: My 3π adventure By: ppkstat on Tue, 10 May 2022 16:04
		Re: My 3π adventure By: Wayne Parham on Tue, 10 May 2022 16:34
		Re: My 3π adventure By: ppkstat on Sun, 05 June 2022 06:57
		Re: My 3π adventure By: ppkstat on Wed, 22 June 2022 07:52
		Re: My 3π adventure By: Wayne Parham on Wed, 22 June 2022 11:18
		Re: My 3π adventure By: ppkstat on Thu, 23 June 2022 09:46
		Re: My 3π adventure By: Wayne Parham on Thu, 23 June 2022 10:54
		Re: My 3π adventure By: ppkstat on Fri, 24 June 2022 12:05
		Re: My 3π adventure By: Wayne Parham on Fri, 24 June 2022 12:43
		Re: My 3π adventure By: ppkstat on Fri, 24 June 2022 13:43
		Re: My 3π adventure By: Wayne Parham on Fri, 24 June 2022 14:57
		Re: My 3π adventure By: ppkstat on Fri, 24 June 2022 19:18
		Re: My 3π adventure By: Wayne Parham on Fri, 24 June 2022 20:25
		Re: My 3π adventure By: ppkstat on Sat, 25 June 2022 17:57
		Re: My 3π adventure By: Wayne Parham on Sat, 25 June 2022 18:38
		Re: My 3π adventure By: ppkstat on Sat, 25 June 2022 18:53
		Re: My 3π adventure By: ppkstat on Sat, 25 June 2022 19:33
		Re: My 3π adventure By: Wayne Parham on Sat, 25 June 2022 20:03
		Re: My 3π adventure By: ppkstat on Sat, 25 June 2022 20:26
		Re: My 3π adventure By: ppkstat on Sun, 26 June 2022 18:35
		Re: My 3π adventure By: Wayne Parham on Mon, 27 June 2022 08:49
		Re: My 3π adventure By: ppkstat on Mon, 27 June 2022 08:56
		Re: My 3π adventure By: ppkstat on Tue, 28 June 2022 14:33
		Re: My 3π adventure By: Wayne Parham on Tue, 28 June 2022 14:50
		Re: My 3π adventure By: ppkstat on Thu, 30 June 2022 13:27
		Re: My 3π adventure By: Wayne Parham on Fri, 01 July 2022 07:52
		Re: My 3π adventure By: ppkstat on Mon, 11 July 2022 08:50
		Re: My 3π adventure By: Wayne Parham on Mon, 11 July 2022 11:03
		Re: My 3π adventure By: ppkstat on Thu, 28 July 2022 08:29
		Re: My 3π adventure By: Wayne Parham on Thu, 28 July 2022 08:40
		Re: My 3π adventure By: Rusty on Thu, 28 July 2022 09:16
		Re: My 3π adventure By: Barryso on Thu, 28 July 2022 12:32
		Re: My 3π adventure By: ppkstat on Mon, 22 August 2022 16:02
		Re: My 3π adventure By: Wayne Parham on Mon, 22 August 2022 17:01
		Re: My 3π adventure By: ppkstat on Mon, 22 August 2022 17:33
		Re: My 3π adventure By: Wayne Parham on Mon, 22 August 2022 18:33
		Re: My 3π adventure By: Wayne Parham on Tue, 23 August 2022 09:09
		Re: My 3π adventure By: ppkstat on Tue, 23 August 2022 13:43
		Re: My 3π adventure By: Wayne Parham on Tue, 23 August 2022 14:29

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