Hi there!
I am planning to build a couple of subwooferes for playing music aimed at the lowest notes, size limited to 200-220 litres.
And saw this driver by RCF, the LF18N408.
Xmax +/- 15mm. fs 30Hz
No comments on the web yet.
Has anyone used it?
I was planning to tune the box at 30hz.
Would it be recommended for this use?
What size to be used in a better way?
As well, seems to offer as well very good performance/price ratio both the Beyma 18PWB100 Fe and RCF LF18N405. Any opinions on those?
Thanks and regards from Spain.
Antonio
I am planning to build a couple of subwooferes for playing music aimed at the lowest notes, size limited to 200-220 litres.
And saw this driver by RCF, the LF18N408.
Xmax +/- 15mm. fs 30Hz
No comments on the web yet.
Has anyone used it?
I was planning to tune the box at 30hz.
Would it be recommended for this use?
What size to be used in a better way?
As well, seems to offer as well very good performance/price ratio both the Beyma 18PWB100 Fe and RCF LF18N405. Any opinions on those?
Thanks and regards from Spain.
Antonio
For the size constrain, you might be limited to Direct Radiation option, like vented box and other in this family type.
You can find some options in the link below:
https://freeloudspeakerplan.rf.gd/
You can find some options in the link below:
https://freeloudspeakerplan.rf.gd/
Greets!
No experience with these, but you can choose to the 1st approximation by calculating its upper mass corner (Fhm = 2*Fs/Qts) Vs your desired XO point and a max flat alignment to compare box size, tuning:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96
No experience with these, but you can choose to the 1st approximation by calculating its upper mass corner (Fhm = 2*Fs/Qts) Vs your desired XO point and a max flat alignment to compare box size, tuning:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96
I have been eying that driver for some time for a new compact (140L, 600cm2 port BR). Have also considered the LF18N405 but 408 has an improved VC, longer travel spider and demodulating rings compared to the 405. BR is your best bet wih those constraints.
I think his max volume constrain is related the external box dimensions.
So if hornresp in your simulation predict 220L, probably, with panel to construct the box the final volume will be higher.
You shown a nice option if he can accept the volume.
I don't like this negative flare TH for low end extension. Some maddd filtering gets flat response tho'
Using a parametric CAD and a 18mm plywood to reach the same results in terms of simulation It was required 317L
Attachments
My original model only needed 292L vs 317L externally for 126.6 vs 126.26 dB's @ 35.20hz with 19.05mm vs 18mm wood.
Your throat (490.32 vs 500cm2) and mouth (1103.22 vs 1477.25cm2) are bigger.
292L = 29.25" H x 29.75" D x 20.5" W.
317L = 31.24" H x 29.38" D x 21.08" W.
But, I like your rising response better.
I try to design enclosures that are dimension friendly, like 0.25, 0.50, 0.75, or 1.00".
Your throat (490.32 vs 500cm2) and mouth (1103.22 vs 1477.25cm2) are bigger.
292L = 29.25" H x 29.75" D x 20.5" W.
317L = 31.24" H x 29.38" D x 21.08" W.
But, I like your rising response better.
I try to design enclosures that are dimension friendly, like 0.25, 0.50, 0.75, or 1.00".
that is not friendly for use metric units user 🙂
It was just an approximation so the guy already have a good estimation about the total volume for this type o TH.
Units conversion are crazy. I understand you.
Maybe it's better to use international unit system while interacting in a global environment such as forums 🙂
Imperial units is the standard only in countries influenced from UK like USA but it's not the international standard LOL
It doesn't matter, people needs to be free to use what they like.
Maybe it's better to use international unit system while interacting in a global environment such as forums 🙂
Imperial units is the standard only in countries influenced from UK like USA but it's not the international standard LOL
It doesn't matter, people needs to be free to use what they like.
NASA uses metric
CERN uses metric
scientific and research entities use metric
Sansui use metric
Me use metric
BP1 : Kapisch?
Standard for UK don't mean world wide
Scientific and researchers use metric
Since this DIY forum is a research and development entity ,:we must standardize to the metric system.
Ya'll lucky I don't use just in2 and ft3!
My problem is HR uses cm for enclosure dimension, yet folk use mm or m when posting enclosure dimensions. I would never post enclosure dimensions in yards or feet. I will state a horn length in feet...your body does have 2 of them 🦶🦶
My problem is HR uses cm for enclosure dimension, yet folk use mm or m when posting enclosure dimensions. I would never post enclosure dimensions in yards or feet. I will state a horn length in feet...your body does have 2 of them 🦶🦶