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New 3-way mid-top

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ceharden View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Topic: New 3-way mid-top
    Posted: 01 March 2020 at 8:24pm
Another much overdue new design:

3-way mid-top for small venues.  12"+8"+1".





Getting the combined rear chamber and port design right took a bit of thought.

Drivers are all 18Sound.  12ND930, 8M400 and NSD1095 on XR1064.  Runs 2-way active with a custom passive crossover between the 8" and 1".

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Post Options Post Options   Thanks (0) Thanks(0)   Quote colint Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2020 at 9:49pm
Nice looking box
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2020 at 9:51pm
Nice build , nice works..respect..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2020 at 10:53pm
really nice Chris. 

bet it sounds great. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2020 at 11:21pm
A+
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2020 at 1:06am
Luckily I'm able to get wood CNC'd fairly easily.  I'm far too lazy nowadays to cut everything from scratch.  Still took many hours working on the CAD though.

I haven't gigged them yet but testing so far is promising.  The 8" is covering ~400Hz to 2.4kHz and the TiN diaphragm on the 1" is quite nice.  The impedance lumps on the 1" around the crossover region caused a few issues with the passive crossover design but managed to make it work without adding lots of extra compensation components.  If you're wondering, 2.4kHz was settled on because it's a half wavelength of the 8"/1" driver offset so you can effectively get them in phase at the crossover point. Yes you get issues either side but it works well enough.

It's the first cab I've designed for myself for a long time, have had the drivers lying around for years.  Originally I was working on all kinds of complex horn loaded designs but realised for a lot of the jobs I do in small venues, something like this would be far more useful.

Next up is something new to do the bass underneath...


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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2020 at 10:54am
Nice work there, I still have a load of your old bits in the garage and one day I'll do a similar project. Sometimes trying tomake the best thing you can out of a pile of odd bits is an interesting challenge.

You don't go back once you've got a decent CNC though do you. I was thinking the other day that with the right workflow angled cuts wouldn't be too hard or take too long.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2020 at 2:31pm
Sometimes, reflex is all you need!

Look tidy. Personally I may have tried a 15/8/1, just to help out lower, but obviously box size goes up, which I presume was not your aim!

Bit of a fan of a mid doing 400-2.5K ish. I have always had a worry about voice fundamentals 200-400, and then rest of voice in a different driver, but seems to hold together in my experiences.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MPASOUND Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2020 at 10:05am
Very nice looking project! NSD1095n is my favourite 1" driver. 
It's just bits of paper flapping about in a box.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dlyxover Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2020 at 7:37pm
tidy looking enclosure
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BP1Fanatic Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2020 at 6:12pm
Nice work! Can you post some measured graphs?
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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2022 at 1:39pm
Hey does your cnc guys charge much? I need to get some cabs sorted for someone and im not far away from you
Love this new top btw
me so horny me love you long throw
horn loaded for her pleasure
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