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Multi-Way Conventional loudspeakers with crossovers

Zaph Audio SR71 Build: Qs as we go
Zaph Audio SR71 Build: Qs as we go
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Old 14th January 2018, 02:46 AM   #1
fodorfolde is offline fodorfolde  Canada
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Default Zaph Audio SR71 Build: Qs as we go

Hi Everyone,

I'm a long-time lurker, and decided to jump into the game with a build of some Zaph Audio SR71s. As a novice level woodworking/electronics DIYer, I thought it's a fairly simple way to get into it, and figured I can handle everything... but expect will hit some bumps in the road.. Will post pics and questions as I go, and am hoping you guys can steer me from bone-headed mistakes. Thanks in advance for any help you can offer!

Bobby C (ID: fodorfolde)
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Old 14th January 2018, 01:55 PM   #2
fodorfolde is offline fodorfolde  Canada
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Default Kit unpacked

Just an intro...
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Old 14th January 2018, 02:01 PM   #3
fodorfolde is offline fodorfolde  Canada
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Default Wood for speakers and stands rough cut.

Used 3/4 MDF.
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Old 14th January 2018, 07:36 PM   #4
fodorfolde is offline fodorfolde  Canada
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Default Stand legs glued together...

...and later sanded.
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Old 14th January 2018, 07:41 PM   #5
fodorfolde is offline fodorfolde  Canada
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Default Gluing speaker boxes together.

I disregarded Grade 11 woodworking teacher's teachings and went with biscuits and dowels. Simply didn't have access to tools to do a decent rabbet joing and figured it wouldn't matter in the long run. Someone tell me if I was wrong (for the next build.
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Old 14th January 2018, 07:43 PM   #6
fodorfolde is offline fodorfolde  Canada
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Default Braces into the box were easy.

So far, following the plans has been easy.

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Old 14th January 2018, 07:46 PM   #7
fodorfolde is offline fodorfolde  Canada
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Default Gluing baffles.

Cut one piece of 1/2 MDF to fit inside the speaker box. Rough cut outer piece, glued together, then sanded the baffle to a perfect fit.
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Old 14th January 2018, 07:49 PM   #8
fodorfolde is offline fodorfolde  Canada
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Default Back panel trimmed down to fit with router.

Followed by a sand.
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Old 14th January 2018, 08:02 PM   #9
fodorfolde is offline fodorfolde  Canada
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OK, first questions. While putting together a $5 circle jig for the router (so I can cut out holes for the two drivers and the plastic cone on back panel) I realized I don't have have a blueprint for the back panel.

Question 1: does it matter where the port tube/cone opening is set on the back panel? Same thing for the quick connect cup box. I can email John K but considering how much time he's put into this stuff, I hate to bother him with such a question. Can't find a schematic for the back panel, no matter where I look.

Last edited by fodorfolde; 14th January 2018 at 08:12 PM.
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Old 14th January 2018, 08:25 PM   #10
giralfino is online now giralfino  Italy
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Look here: http://www.zaphaudio.com/SR71.pdf
The port is more or less at tweeter height, you should only make sure it doesn't stay in the way of the dowels. The same is for the terminals, place the crossover boards where you want them to be and then decide where to place the terminals. Here you can see a photo of the rear: http://www.zaphaudio.com/SR71-back.jpg

Ralf
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