Phil
Senior Engineer
Posts: 178
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Post by Phil on Aug 24, 2007 16:03:33 GMT 1
yeh they look super.
Looking at them now my main problem would be the horn, with its shape. I could try using two smaller square horn flares.
Impedance would be a problem for me as the majoriy of all the 8" speakers I can get easily are 8 ohm. I'm guessing not many cabs have speakers wired in series? as if one goes the whole chain goes.
It would be interesting for me to try and design some but I dont really have the money.
I will have a think
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Post by muppet on Aug 29, 2007 12:57:31 GMT 1
lol the bose 802 is wired in series and Parallel
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Post by muppet on Aug 29, 2007 12:58:21 GMT 1
nice looking boxes btw
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Post by sw2407 on Aug 31, 2007 18:36:33 GMT 1
I have a design for a 4x10" mid/top cab a mate & I designed over 20 years ago. They worked superbly - terrific clarity of the mid and a great bottom down to about 50Hz actually! 2 pairs were made- the 1st pair of prototypes weighed a ton as we made them entirely from 18mm MDF (pre-cut by a local sawmill as a favour!) We had Mckenzie acoustics custom make some 10" drivers for us (I think they were bought over by Fane) as we wanted a heavy cone to increase the damping factor. Each driver was 16ohm. Prototypes were based on their excellent 100w Studio series drivers, but after tweeking the cabs and a run down to Mckenzie to run a test in their design facility, we settled on 4 x 60w drivers as they were just too loud for my JBL bass cabs! (Remember, in those days a 500w+500w amp was big!) The second pair were built from 15mm marine ply - a bit lighter and harder wearing! When I sold all my gear one set went to my mate who helped design them & the other were sold to a band and I heard a couple of years ago they were still using them!
Our plan was to design a range of 4x8", 4x10", and 4x12" using the same equations for cabinet dimensions altered for the driver size, but I got married, and my mate got a job miles away, so we never did.
If you want a serious design, which proved a lot of theory we were working on, I could probably find a copy of our design - they would look knaff compared to the modern Mackie cabs, but you could work on the cosmetics!
My advice - keep building as long as you have time - you will learn a lot of theory which will help your Physics at school - and you will learn your systems limitations. Also - build the best cabs you can and put in cheaper drivers until you can afford better ones - that always worked for me.
regards,
SW
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Aug 31, 2007 21:35:37 GMT 1
Well I would certainly find it interesting to have alook at the cab design and see how other people make them - I guess thats how I learn.
I usually sit for ages comparing my design on paper to other cabs and I try and make a mixture or pick out little bits.
heres my email if you do happen do find any info
sparksounds@googlemail.com
Thanks
Phil
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Post by sw2407 on Aug 31, 2007 21:55:47 GMT 1
I'll look out the original design spec. over the weekend. I always used to plan the design first and check the theory before I cut the wood - otherwise it can get expensive. Speaker design is more than just work out the volume of the box & stick in a port! If you can get your head around the theory behind my babies you will really be on the way to understanding how sound waves work and how cabinets influence drivers. I am interested in resurecting our old design for my son's band so will also look at what suitable drivers are available - I'm hoping to get down to Plasa this year so I can speak to some suppliers.
SW
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