If I calculate the box based on the Dayton Epique 5.5in, I get this:
So to use 2 drivers I have to double the volume.
But what will be the f3 for two drivers?
So to use 2 drivers I have to double the volume.
But what will be the f3 for two drivers?
Thank you!
now, looking for achievable low extension, I get this:
How does the 30Hz potential here relates to the f3 of only 72hz in the above calc?
How do I practically achieve 30hz if it seems possible based on xmax and size?
now, looking for achievable low extension, I get this:
How does the 30Hz potential here relates to the f3 of only 72hz in the above calc?
How do I practically achieve 30hz if it seems possible based on xmax and size?
If you use a PC, download Vituixcad2 and use the Enclosure tool to calculate all tha data; you can use WinISD too.
https://kimmosaunisto.net/Software/VituixCAD/VituixCAD2_setup.exe
https://kimmosaunisto.net/Software/VituixCAD/VituixCAD2_setup.exe
Epique drivers look for me more of like a subwoofers. You are building 2-ways? Huge surround half rolls are not very good for 2+ kHz and up frequencies.
For true woofers maybe try RS series.
For true woofers maybe try RS series.
3-ways. Midrange possibly this one
https://sbacoustics.com/product/5-satori-mr13p-8/
Looked at RS. 4mm xmax. 🤔
https://sbacoustics.com/product/5-satori-mr13p-8/
Looked at RS. 4mm xmax. 🤔
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RS180 and 225 are +-6mm, 12mm total.
Satori 6mm total.
Please correct me, if I am mistaken, I have only RS100 at hand.
That satori is just 5 inch driver, marked as midrange by manufacturer. You cannot squeeze much bass from this size driver. If that is most your front baffle of current box accepts - you are out of luck.
Those are woofers:
https://sbacoustics.com/product-category/drivers/woofers/nrx-woofers/
Satori 6mm total.
Please correct me, if I am mistaken, I have only RS100 at hand.
That satori is just 5 inch driver, marked as midrange by manufacturer. You cannot squeeze much bass from this size driver. If that is most your front baffle of current box accepts - you are out of luck.
Those are woofers:
https://sbacoustics.com/product-category/drivers/woofers/nrx-woofers/
That's a midrange, you should look for the mw series
https://sbacoustics.com/product-category/drivers/midwoofers/satori-midwoofers/
I think the first step is to become proficient at taking good measurements. The odds are, the tweeter is rather limited in performance. I would recommend a waveguide type, as it will not have as much diffraction Can you alter the mounting holes?
Yes, the current tweeter does not look good.
Yes, I was also looking at waveguide tweeters. See post 14.
Yes, I will alter the holes. There will be a new thick front panel.
Yes, I was also looking at waveguide tweeters. See post 14.
Yes, I will alter the holes. There will be a new thick front panel.
To clarify current thinking for the drivers per channel (in step 2):
- HF: SB Satory dome fabric 1in 8ohm black (or a one of the waveguide ones). From the wg available one is non Satory and the Satory one is 2cm too big for my baffle
- MF: 5in Satory as linked above
- LF: two Dayton Epique 5.5in. I have looked at other 5.5in woofers but they all need much larger box for their Qts, Fs and Vas
I also looked at the SB 5in coax, but it looks weak compared to standalone drivers in the Satory range
You will use DSP which allows you to compensate for the drop or surge of the frequency response of the speaker at its resonance frequency, this allows you to reduce the requirements for Qts, Fs and Vas. Simply put, the lack of volume of the box is easily compensated for by frequency correction using DSP, as long as the speaker can withstand the necessary power to correct its frequency response.
If you have 20L, this are two sb15nbac-8 in parallel; tuning frequency is 38Hz (vent 6x23cm)
You could also realise a 2.5-way.
Oh, thank you. I have not considered this driver for some reason. Looking interesting!
I was planning closed box, with hopefully lower volume requirement. I may struggle to get 20L. How much smaller a closed box would be?
I would use a port if I am forced to by some consideration.
Re 2.5 way: is there a benefit? I do have 3 amp channels, not using one would need a strong plus to go this way.
I was planning closed box, with hopefully lower volume requirement. I may struggle to get 20L. How much smaller a closed box would be?
I would use a port if I am forced to by some consideration.
Re 2.5 way: is there a benefit? I do have 3 amp channels, not using one would need a strong plus to go this way.
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This was the thinkng that lead me to the Epiques. I thought I can push them to 40-30hz at reasonsble spl as they have high power and xmax spec, way higher than any other 5in I could find. They also have way lower box vol requirement. But I am not sure if my thinking is right.
If there is a pair of other 5 to 5.5 in drivers (15cm max od) that have the box vol that I can achieve and if they will be expected to perform better than the Epiqus, then I will go for those. I just do not know how to perform this selection process.
two sb15nbac-8 give me 12.82L, which I may achieve in my box.
But would’t the Epiques give me significantly more headroom (due to their higher rated power and xmax) and therefore Epiques is the better choice?
But would’t the Epiques give me significantly more headroom (due to their higher rated power and xmax) and therefore Epiques is the better choice?
@shadowplay62
Would you kindly simulate a pair of the 5.5in epiques in 6-12L closed box and help me to compare vs the SB?
Would you kindly simulate a pair of the 5.5in epiques in 6-12L closed box and help me to compare vs the SB?
Yes, you reduce lobing/comb filtering. Having three drivers playing parallel at a x-over frequency with wavelength much bigger than the driver spacing can be really bad.
This is why I thought the existing speaker had to be a 2.5 way, by the way.
You also don't have to stick to the Qtb=0.707, because you will use some equalisation anyway. Having lower Qtb will slightly reduce the required low frequency boost and power and thus thermal voice coil stress.
Again, you will equalise the bass drivers anyway, so the main limiting factor for sealed enclosures is the max displacement volume (Sd*Xmax) and eventually the max. thermal power that will limit your low frequency output, irrespective of actual driver response in the box.
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