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New 15/1,4 Top

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JulianDA View Drop Down
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    Posted: 09 August 2022 at 3:19pm
Greetings,

just for the pleasure of seeing something being built, i wanted to show you our newest addition to the soundsystem. Its a pretty typical top with an 18S 15NMB420 in ~100L Br tuned to 63Hz for mids and an 18S NSD1480N on the XT1464 Horn for the highs. But i will just let the pictures speak for themselfes :)

This was the rough plan:


with a bit of internal bracing, a 27mm baffle and something to secure the HT Driver:


Routered sides for the grill and some foam:


sanded down for painting:


first one painted and assembled:


tested ontop of an X1 letterbox:


finished and painted a second one:


fitted the homemade grill:


and both finished on our "new" double 15 horns (which have their own thread):


We are pretty happy with how they turned out and they are a great upgrade to our stack which always had a lacking top-section. Now we have two stacks comprising of 2 X1, 1 double 15 horn, one of the new 15"-tops and one 10"-top for infill, all waiting for their first outing. Embarrassed


Edited by JulianDA - 14 August 2022 at 2:44pm
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partya View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote partya Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2022 at 4:40am
Very nice build Hug

How did you form the 90 degree (or thereabouts) bend on the side of your grills???
Turn it up! Turn what up?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pinyorouk Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2022 at 10:17am
Excellent work. Well done! 
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JulianDA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2022 at 12:50pm
Thank you both Smile

Originally posted by partya partya wrote:

How did you form the 90 degree (or thereabouts) bend on the side of your grills???

It's actually pretty easy. We always use cheap 1,5mm thick galvanised steel grills with square holes since all the fancy stuff is too expensive. 
First we cut the big sheets down to the right size with an anglegrinder. Then we use some steel flatbar (5mm thick) an clamp it with 4-6 big screwclamps from both sides on the part that will be bend. This contraption is then fastened in a benchvise with the bulk of the grill sticking out on top. We then just bend it by hand (two people is advised for bigger stuff like in this post) and finish it by using a small hammer to get the bend "sharp" enough. This works really well and it's no problem if there are some imperfections, since the foam hides them pretty well.
(this can also be done with grills that need all 4 sides bend, you just need the right lentgh of flatbar and some ingenuity for the clamping)

For these grills we then soldered some washers over the square holes where the screws go later after stripping the zink-coating with some sandpaper on that places. This ensured that the tops of the screws are flat with the foam without denting it. 
We came up with this method just for this build and it worked surprisingly well :)

Hope this answered your question :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote imageoven Quote  Post ReplyReply Direct Link To This Post Posted: 11 August 2022 at 12:29am
They look good
Originally posted by JulianDA JulianDA wrote:

For these grills we then soldered some washers over the square holes where the screws go later after stripping the zink-coating with some sandpaper on that places. This ensured that the tops of the screws are flat with the foam without denting it.

Do you mean soldered, or welded?
Keep pushing on, things are gonna get better.
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JulianDA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 11 August 2022 at 12:30pm
Originally posted by imageoven imageoven wrote:

They look good

Do you mean soldered, or welded?

Thanks :) I actually mean soldered. We feared that we may have to weld them, but thought why not test soldering first. After roughing up the surface with the sandpaper and getting to bare steel (On the grill and the washers), we just used one soldering iron to heat the grill and another to do the soldering. With the fluxcore lead-solder it worked really well and wetted all the surfaces as good as it can be.
Obviously I can't tell you how long this holds, but since the joint is loaded just in compression from the screw, I don't think it will fail anytime soon :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2022 at 5:40am
Nice work! Great horn and comp combo, natural high freq roll off and good down to 800hz - I did a similar midtop but with a 14NA100 in place of the 18S.
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JulianDA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2022 at 2:48pm
Originally posted by vertx vertx wrote:

Nice work! Great horn and comp combo, natural high freq roll off and good down to 800hz - I did a similar midtop but with a 14NA100 in place of the 18S.

Thanks :) 
Yes it's a really nice combo. The HT Driver is just a pleasure to work with, albeit it's a bit pricey. We cross it over to the MT at 1kHz since we found this gives the best "pattern-matching" with the 15" MT. 
In general the combo is nice on the ears because the HT is not at all the bottleneck in terms of achievable SPL.
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