Jump to content

An attempt to build K-402-MEH clone in wood


Recommended Posts

The John Linsley-Hood amps should work fine for the top end. I have a pair I bought a couple years ago, but still have them wrapped up. As simple as the are, I still need to build a power supply and really fivure out how to connect everything. Mine are supposed to be the 1969 version.

  • Like 1
Link to comment
Share on other sites

The John Linsley-Hood amps should work fine for the top end. I have a pair I bought a couple years ago, but still have them wrapped up. As simple as the are, I still need to build a power supply and really fivure out how to connect everything. Mine are supposed to be the 1969 version.

Here is some info on his design.

 

https://www.passdiy.com/project/amplifiers/the-plh-amplifier

 

Sent from my SM-T830 using Tapatalk

 

 

 

Link to comment
Share on other sites

I've been through over a dozen sites with info, but the boards I got had zero documentation. I need to dig them out and start over with them.

Link to comment
Share on other sites

I discovered that JLH amp realization can be bought here at an affordable price. Small local company produces them here. I can be sure that it is made of quality parts and indeed pure Class A. With Chinese versions this is a lottery.

 

I remember Chris was writing about appropriate type of amps for horns, but it is too complicated for me to understand if JLH fits the requirement.

Link to comment
Share on other sites

@StabMe, speakers look great, well done! Can you show a pic or explain how you built the transition from compression driver to horn? That seems tricky, going from straight sides, ending in a rectangle, them transitioning to 2” round hole. 
thanks for sharing! Ted

  • Like 1
Link to comment
Share on other sites

  • 1 month later...
On 4/16/2021 at 1:53 AM, StabMe said:

Hey!

 

The project is moving, albeit somewhat slowly. The guy at the carpentry is now gluing the parts together. Brought loudspeakers to him yesterday so that he can he if they fit nicely and do amendments if necessary.

 

Some pics:

 

IMG_20210415_095049.jpg.e927250777a00edea4420b97d0b8ee6a.jpg

 

IMG_20210415_094911.jpg.64c1b8dd0b75e786519e5226ba71bf39.jpg

 

IMG_20210405_095655.jpg.029e7250a4dc246757d518be6c32ecaa.jpg

 

 

 

Nice work!

Link to comment
Share on other sites

  • 1 month later...

The project is moving very slowly, as i stated earlier in this topic.

 

Managed to paint and polish all the parts of the first speaker. Here is how the horn part looks:

 

K-402.thumb.jpeg.5b0b8a5a6d01d2f4d7ae3d58853d1c84.jpeg

 

Preparing the horn for painting took a lot of time. 

 

The second speaker is still in the making. The guy who works on it promises to have it ready in a week or two.

 

Can't wait to give them a listen!

 

Oh, and i bought a locally made clone of the JLH amp which will be used for HF duties. 

 

 

  • Like 6
  • Thanks 2
Link to comment
Share on other sites

  • 1 month later...
On 7/12/2021 at 8:54 AM, parlophone1 said:

Looking very nice.

What was the workflow regarding the preparation for painting and the painting?

 

Frankly, i don't even know what process the guy is using. Based on what he said, basically the workflow if as follows: prime the part to be painted, see if anything sticks out, polish 'bad' regions, prime again and if nothing comes up the part is painted.

 

On 7/15/2021 at 8:22 AM, Khornukopia said:

You are making awesome progress. Your paint job looks good. That horn is built solid, it is going to sound great. 

 

Just can't wait to hear it!

 

I decided to strengthen the box walls as in the pics:

image.thumb.png.5ccb71b61e0cf86a6ca93a12614f2da4.png

 

image.thumb.png.7e4e89b2e90855e5c5fc70a00c240f62.png

  • Like 1
Link to comment
Share on other sites

Since the room i am planning to place the MEHs in is kinda big and has very little furniture in it, i was thinkiong about placing diffusers on the walls. As of now, the room is very echoey.

 

I already have 6 Leanfusers prebuilt and i was contemplating on making 4 more. Here is how i am going to place them:

 

image.thumb.png.a4a8e8ff4e7187ce23c5115dea2da852.png

 

image.thumb.png.172e1503c293459a3dea96a791f58a86.png

 

The room is about 6 meters wide and 12 meters long. Ceiling height is about 3.1 meters. Listening position is about 3.5 meters from the front wall.

 

I was also thinking about placing filling a 3x3 meters space on the ceiling that is between listening position and front wall with 2D 60x60cm diffusers in a chess fashion. To make them lighter weight, i was thinking about making them out of XPS of maximum density i could find.

 

image.png.64ef681d2f9e14c8be44ed51dd3cd0d3.png 

 

Of course, i will put a carpet on the floor.

 

What do you think? This is what can be done relatively easy. Should i expect some nice results?

Edited by StabMe
Link to comment
Share on other sites

3 hours ago, StabMe said:

I was also thinking about placing filling a 3x3 meters space on the ceiling that is between listening position and front wall with 2D 60x60cm diffusers in a chess fashion. To make them lighter weight, i was thinking about making them out of XPS of maximum density i could find.

 

Regular acoustic ceiling tiles would perform better than XPS foam.

Link to comment
Share on other sites

It's a diffuser, and doesn't need to be acoustic foam. They make them out of polystyrene, too. They can be smooth and painted, or whatever. The wood always looks cool, but weighs too much. I looked at aircraft balsa, but it was going to be too expensive.

 

Did you use QRDude to calculate the design for the frequencies you wanted to diffuse?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...