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Multi-Way Conventional loudspeakers with crossovers

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Old 6th September 2012, 10:34 PM   #1
56oval is offline 56oval  Australia
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Default 4 way active ,passive or what works best

Hello Diy

This is my first speaker project ,I have a habit of biting of more than I can chew when it comes to projects .
This project has been going for a number of years now ,life just gets in the way more often than not . I'm also building the electronics from frontend to amps which doesn't help .Plus I have no real electronics knowledge .Plus the room it self needs a bit of acoustic treatment .I was a its all about the front end ,but over the years I feel its more speaker ,xover room interaction .

Any here's a novice approache to speaker design and build .

The design ,seperate bass cab's to the mid section so I can move them around and swap out the top section for a Synergy horn ,designed by Paul Spencer ,but thats another project .
Red Spade Audio: Synergy horn flat pack kit
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Drivers ,I've heard the Raven tweeters a number of times and I really like how they sound & they sound really nice with PHL's .Bought the drivers from Pat @ War Audio in Perth ,Australia . Pat has been very helpful over the years .
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PHL's , 1120 6.5"mid , PHL 3020 10" lower mid , PHL 5021 15" bass driver.
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CHeers
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Old 6th September 2012, 10:51 PM   #2
56oval is offline 56oval  Australia
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Default Cab's & Baffles

I wanted large round overs on the corners and a triangle shape cab ,so with toe in the cabs don't look as wide .Also hoping for less defraction on the edge's .
I looked at making a sub frame then wrap it in multiple layers of bendy ply .I found a supplier who would guaranty a 100mm radius with there ply .I was having a chat with a cabinet maker who also built speaker ,Andrew W. from Aslan Acoustic about my project and he offered to CNC the cabs for me .He also machined the front baffles ,which he loved doing not.I think 12 months latter the swarf was still appearing .

Cabinet piece's the jigsaw begins .
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15" bass baffle
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How to build a complicated bass cab out of bits ,for large round overs
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Bass cab Wall material ,Finish aircraft grade BB and alloy .
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After the cnc'ing a quick stack
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CHeers

Last edited by 56oval; 6th September 2012 at 10:53 PM.
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Old 6th September 2012, 10:54 PM   #3
adason is offline adason  United States
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i like it
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Old 6th September 2012, 11:00 PM   #4
56oval is offline 56oval  Australia
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Default Stacking to Glue

Talking to Andrew about gluing the cab's he told me to watch out for horizontal movement when clamping down to glue . So I made a jig to hold it all in position , if you know me I like making jigs . To make it more complicated for myself I used ally dowels instead of timber ,15 of them .I hoping the alloy baffles & dowels will add stiffness but not alot of weight .
The jig mock up
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The rectangle section is set back and acks as a dummy baffle .
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Cheers

Last edited by 56oval; 6th September 2012 at 11:02 PM.
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Old 6th September 2012, 11:02 PM   #5
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Novice approach my little donkey
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Old 6th September 2012, 11:15 PM   #6
56oval is offline 56oval  Australia
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Default Gluing

Talking with Andrew about gluing he warned me about horizontal movement when gluing and clamping down . So I made a jig ,I like making jigs .
I also done a dry run stacking and clamping to see how much work time I had ,the epoxy glue I used has a 45min work time .The epoxy I used is designed to glue dissimilar materials . The dowels 15 of them are alloy ,I used alloy dowels & baffles ,hoping to improve the stiffness of the cabinets .
Glue
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Jig mock up
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The rectangle section is set back to ack as a dummy baffle to hold the cab in postion .
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Cheers
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Old 6th September 2012, 11:16 PM   #7
56oval is offline 56oval  Australia
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Quote:
Originally Posted by adason View Post
i like it
Cheers Mate

Quote:
Originally Posted by Moondog55 View Post
Novice approach my little donkey
Donkey the key word

Cheers
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Old 6th September 2012, 11:22 PM   #8
56oval is offline 56oval  Australia
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Default Gluing

Also a good tip given to me ,run the dowels down once its all stacked .
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Afetr allowing drying time pulled out
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The cabs shiny due to spreading the beads of glue .

Cheers
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Old 6th September 2012, 11:27 PM   #9
56oval is offline 56oval  Australia
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Default Putting the tops & bottoms on

I left the tops & bottoms last so I could spread out the beads of glue inside .I couldn't get to the 6.5" section .
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All glued up Baffles fit like a bum in a bucket .
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Next step mounting the baffle .

Cheers
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Old 6th September 2012, 11:33 PM   #10
56oval is offline 56oval  Australia
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Default Fixing the baffle

I need to fix the baffle to the cab and I need to route the cab to get a nice flush fit .
ALso should I just bond and screw the baffle inplace or is there any benifit to having the baffle semi decoupled from the cabinet .

Any ideas guys .

CHeers
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