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<blockquote data-quote="Peter Morris" data-source="post: 138784" data-attributes="member: 652">Re: New DIY Mid HighThat’s fantastic Don,Now that you have drawn it to scale it immediately highlighted an error on my behalf :blush: – I have transposed one dimension incorrectly - 165mm should have been 135mm for the distance from the centre line to the start of the horn throat exit. The 75mm exit slot (horn mouth) from the speaker is in the centre of the driver. (I have wondered if it would cause any issues if it was not in the centre and I could make the horn slightly longer by moving the two horn mouths closer to the centre ??)The gap in the middle of the two 12&quot; drivers is also slightly more. This is achieved by machining off more of the corner as shown in my sketch in the post above. To make construction easy I made this part of the corner bend based on a 90 degree join also as shown in my above sketch. I also used more or less 3 pannels in this section of the horn, but you maybe able to get away with 2 has you have drawn. The volume in the enclosure needs to be about 35L - 40L. To save weight and create a couple of hand lifting points I removed the panel in the centre of the back of the box.Now that you have drawn it to scale it give a better impression of how space efficient the design is for a horn loaded enclosure, and much speaker power is packed into a relatively small space.What I will do when I have a moment is print out what you have done and mark it up accordingly. (done)Thank you Don, very much appreciated.</blockquote>

[QUOTE="Peter Morris, post: 138784, member: 652"] Re: New DIY Mid High That’s fantastic Don, Now that you have drawn it to scale it immediately highlighted an error on my behalf :blush: – I have transposed one dimension incorrectly - 165mm should have been 135mm for the distance from the centre line to the start of the horn throat exit. The 75mm exit slot (horn mouth) from the speaker is in the centre of the driver. (I have wondered if it would cause any issues if it was not in the centre and I could make the horn slightly longer by moving the two horn mouths closer to the centre ??) The gap in the middle of the two 12" drivers is also slightly more. This is achieved by machining off more of the corner as shown in my sketch in the post above. To make construction easy I made this part of the corner bend based on a 90 degree join also as shown in my above sketch. I also used more or less 3 pannels in this section of the horn, but you maybe able to get away with 2 has you have drawn. The volume in the enclosure needs to be about 35L - 40L. To save weight and create a couple of hand lifting points I removed the panel in the centre of the back of the box. Now that you have drawn it to scale it give a better impression of how space efficient the design is for a horn loaded enclosure, and much speaker power is packed into a relatively small space. What I will do when I have a moment is print out what you have done and mark it up accordingly. (done) Thank you Don, very much appreciated. [/QUOTE]

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