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Crashpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 14 March 2019 at 8:06pm
That looks very usable for starters. You´ll see then....
Nikon and Canon people should not be married to each other. Why did you let this happen?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 14 March 2019 at 8:54pm
What about mounting the driver in reverse, mgnet out?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 14 March 2019 at 10:52pm
Originally posted by bob4 bob4 wrote:

What about mounting the driver in reverse, mgnet out?

That I haven't thought about that Embarrassed

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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2019 at 12:42am
Originally posted by smitske96 smitske96 wrote:

Originally posted by bob4 bob4 wrote:

What about mounting the driver in reverse, mgnet out?

That I haven't thought about that Embarrassed


THATS how I thought you was mounting it in the 1st place.. then you lot were talking about driver displacement and I was like "why would that affect it when the magnet is facing out anyway??"
If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2019 at 5:01am
Good point. I forgot about this possibility. That is another 20l, or so...
And possibility of hearing some chuffing in larger excursions. On the other hand, 21DS115 isn't that loud. The large excursion behavior is "cultivated".
Nikon and Canon people should not be married to each other. Why did you let this happen?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2019 at 11:01am
Sometimes it's so obvious that you don't see it. But that's probably the way to go.
Main challenge now is to find the best way to mount the driver in a doable way. So the front part of the BR port has to be removable. For now I'm thinking of using 4 Tnuts on the cabinet, and then screwe the panel inplace from above. Ofcourse also making everything as airtight as possible.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 3:06pm
Update:

I'm almost certain I'm going the 21" way. Also slot port instead of triangles and normal driver mounting.
So I adjusted my demands a bit Smile. Current external dimensions: 590x740x780, also with these dimensions the cabs fit perfectly in my trailer. Port will be around 150x556 mm so 831 cm2 of port surface. 

Driver choice: Not sure yet, the RCF LF21N551 looks really interesting, but so does the 21DS115.
Probably gonna buy both and test.


Also busy with a dual 10 design for above the subs. Thinking of D&B Q style but with lower xover >900 Hz, also looked at Acoustic line K20 and TW audio T20, but the horn mounting would be a challenge. When I'm more busy with the design it probably deserves it's own topic Thumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 3:37pm
Have you managed to do some simulations?
High BL drivers in a reflex box will have a dip in the 50-60 region. That is exactly where kick drum fundamentals are.
A loss of 3db in that range is not a good thing to me.
Most of the drivers you are listing are mor esuited for horn loading.
They will drop low, but they know to sound a bit "slowish" because the dip in the responce that makes them lose some impact in the kick region.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 4:07pm
I did, It falls of a bit after 100 Hz. Main problem is that there are not much high Xmax drivers with not that high BL.
18TLW3000 would still be first choice but it's even more expensive then the 21DS115.. 

Edit: the newer RCF LF18N405 looks good but limited experience because they are pretty new.


Edited by smitske96 - 23 March 2019 at 4:11pm
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corell View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 4:27pm
You can allways decrease BL by having a resistor wired in serial but not the other way around. Ofcourse you can Do the same with EQ. There is no Problem with a high BL driver as long as you dont expect it to Play flat out of the box with no processing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 5:16pm
Resistor in series with a 1800W driver? Where do i find 1800W resostor?
If you look at the impedance plot and excutrsion plot, you will se that max excursion is exactly where the dip is. So boosting is out of the question.
Cutting some at 40hz means you are deleting the main advantage of such driver and just waisting resources.
18TLW3000 is cheaper then any high power neo B&C. You are just not shopping at the right place.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2019 at 6:15pm
I almost looked everywhere and the 18TLW300 is still more expensive..
18TLW3000 = 385,-
18SW115 = 343,-
18SW100 = 275,-
LF18N405 = 290,-
21DS115 = 382,-
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