CHR 70 Contraption - diyAudio
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Old 25th October 2013, 05:17 AM   #1
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Default CHR 70 Contraption

I am not quite sure how you would label this 'thing' I am making. So contraption will do for now. I have a few options available before I finish the CHRontraption and I don't know what is the right choice. So I thought I might put in a bit of a back story in how I got to where I am now with some photos that I have taken during the build. There are quite a few lessons learnt through this process and I figure someone else might benefit from my mistakes.

In exchange for the story perhaps I could get some advice from the experts that frequent this forum?

The questions will come later, after I have earned some brownie-points...
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Old 25th October 2013, 06:54 AM   #2
zman01 is offline zman01  Bangladesh
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julestnz,

Where's the contraption? Some pics please along with your story...
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Old 25th October 2013, 04:00 PM   #3
chrisb is offline chrisb  Canada
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go on ...


as for learning from others' mistakes - that can certainly work both ways
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Old 25th October 2013, 10:07 PM   #4
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I will link all the relevant pages...

So here is all the MDF cut and ready to go. 18mm MDF. The contraption is going to be 30cm tall so I cut it all from one long piece of MDF 30cm wide.
Click the image to open in full size.

I am useless at cutting the wood exactly and as usual it was not very square. More about that later.

And then a wonderful package arrived. Ordered from MOD-Loudspeakers - Shop in NZ . Thanks guys.

Click the image to open in full size.

Don't they look wonderful...
Click the image to open in full size.

The contraption also includes an amp (left) and power supply (right).
Click the image to open in full size.

These came from HiFimeDIY Store . I have used them a few times and I like the quality and service.

The amp is this: Hifimediy T4 mcap. More than enough grunt if needed, but the contraption is not really about volume, more quality.
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Old 25th October 2013, 10:08 PM   #5
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Chrisb - yeah I have loads to learn still. Only my second speaker build and perhaps a little ambitious. Never mind, its been fun.
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Old 25th October 2013, 10:17 PM   #6
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The CHRontraption is to be based on Andreas' (Andy17) Shoe Box. MarkAudio provides the links to the design. CHR 70 Metal | Markaudio

However my interpretation aims to join the two speakers together with a space in the middle for the amp and power supply. More photos to come.
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Old 26th October 2013, 01:42 AM   #7
gootee is offline gootee  United States
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Quote:
Originally Posted by julestnz View Post
<snipped>

However my interpretation aims to join the two speakers together with a space in the middle for the amp and power supply. More photos to come.
Why join them together? Seems to introduce severe built-in limitations of options for relative positioning. But what is the application scenario?
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Old 26th October 2013, 01:48 AM   #8
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Gootee - yeah. I tend to agree. And it seems rather a waste of some very nice drivers and a not-too-shabby amp.
But I just wanted to set myself the challenge of making a 'portable' sound system. It is to be taken on the road, holidays etc..

As it is coming together I am realising it almost seems to weigh more than one of my children. But it is fun and an interesting challenge. I will share in the story later a moment when i really questioned what I was doing. It remains to be seen how long a life the CHRontraption will have. But it is yet to be born.
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Old 26th October 2013, 04:29 AM   #9
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So the build. I tried to think it all through logically but it sometimes felt like one step forward and two steps back.

Anyway - it started like this...

Click the image to open in full size.

And then..
Click the image to open in full size.

I used some tiny 2cm square pieces of pine top and bottom between the main walls of the speakers. Firstly it helped in the separation but also I want the back wall of this thing to be able to come off. I have some brass screws and some steel bolts that just i just pushed into the pine. They allow for a tight fit and allow me to take the back off when I need to. The idea of the amp shut behind the back wall makes me uncomfortable.

I can also play around with whatever damping I get around to using in the speakers. So the bolt, and then a brass screw to demonstrate how it looks.
Click the image to open in full size.

Click the image to open in full size.
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Old 26th October 2013, 04:39 AM   #10
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I suppose there is a better way or even a better sequence to this build? Advice or opinions appreciated....

So the next bit was cutting the holes in the front wall for the CHRs. As I said above this is my second speaker build and I am much improved. I don't know how many pieces of MDF i wasted on those first speakers. LOL. I won't bore you with all the different ways I tried and failed. Anyway I ended up getting a Jasper Circle Jig and it has made it a lot easier. Jasper - Router Accessories, Circle Guides, Router Base Plates, Houston, TX Butterfly Template

And some pictures of my beloved Jig and Router and the holes:
Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by julestnz; 26th October 2013 at 04:39 AM. Reason: fix mistakes
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