18Sound10NMB420 closed box?

[Ema79]

Good morning, I should start building my speakers soon. But since I had second thoughts about a 12-inch driver, I switched to a 10-ohm one, but I can't find many products suitable for a sealed box project. Or at least not with professional components.
My speakers will be tri-amped with a Xilica DSP.
For bass, I have power with an IcePower 1200AS2.
But now I'm having trouble calculating how to get a good enclosure. I'd like something permanent that I won't have to mess with again, so I'd rather not make a mistake.
The driver I chose is this one: https://loudspeakerdatabase.com/18Sound/10NMB420_16Ω
I'd go with a 16-ohm one as it's more suitable than the 8-ohm one.
With the simulation with WinLSD, I get a very low volume, about 10 liters, for a leveling of about 0.707.
A good compromise between response and volume would be about 30 liters.
Which would be the same volume as the VAS. With a QTC of about 0.470.
And here I can't go any further because I don't have the expertise to determine whether it's incorrect loading or not.
Could you help me find a good compromise for this driver?
Or would it be better to choose another driver? If I had to choose another, could you recommend a driver suitable for frequencies from 60 to 250 Hz,
with a max MMS of 34 grams and an Xmax of 4/5 mm with a demodulating ring? Thanks everyone for the replies.

 

[DVDdoug]

With the simulation with WinLSD, I get a very low volume, about 10 liters, for a leveling of about 0.707.

WinISD should tell you everything you need to know (more than we can tell you without running the simulation/modeling ourselves), and it should help you decide on a sealed or ported enclosure and help you make any other compromises that are best for you.

It's very common to put a subwoofer in a "small" sealed box and then extend the bass with EQ (DSP or analog) and "extra power". It's a bit easier if you are manufacturer and you can make a custom equalization circuit but there are plate amplifiers with adjustable EQ. I assume some "small" full-range active monitors also have EQ built-in (for other reasons too).

This post is a generalization of the difference between sealed and ported speakers. (WinISD should show you the same thing.) The ported speaker goes lower before before it starts falling-off but it has a steeper slope so at some point the sealed speaker is putting-out more sound. You can also "tune" a ported speaker with a small bump-up, which will extend the cutoff frequency down a but more. And the bump may be unnoticeable or desirable.

Sealed speakers are "better" if you're going to boost with EQ because the ported speaker will just flop-around with boosted low frequencies while not putting-out much sound.

But since I had second thoughts about a 12-inch driver, I switched to a 10-ohm one,

10-inches?

That seems kind-of small (to me) for all that massive power you have. (But with 16-Ohms you won't get "full power".) WinISD is probably showing you that with a small box, a smaller woofer usually works better. So if you limited in cabinet size a smaller woofer may work better. But you really have to plug-in the Thiele-Small parameters to know for sure.

 

[Ema79]

At home, I have speakers with two 6.2-inch drivers per speaker, which should equal an 8.5-inch driver. In terms of sound pressure, I have nothing to complain about. What I'm looking for is a driver that can run at full power at 70Hz, because I also have an 18-inch subwoofer that goes linearly down to 15Hz.
I have an Xilica XP 8080 DSP, so I can adjust the volume at certain frequencies. For mid-bass, I'll have an Eighteen Sound 6ND430, which will assist the 10-inch driver if necessary. I chose a 10-inch driver only because I read somewhere that going beyond that size results in a loss of precision and focus in the low-frequency response.
But if that's not the case, I might consider a 12-inch driver.

 

[Vladimir Filevski]

My speakers will be tri-amped with a Xilica DSP.

With the simulation with WinLSD, I get a very low volume, about 10 liters, for a leveling of about 0.707.
A good compromise between response and volume would be about 30 liters.
Which would be the same volume as the VAS. With a QTC of about 0.470.
And here I can't go any further because I don't have the expertise to determine whether it's incorrect loading or not.
Could you help me find a good compromise for this driver?
Or would it be better to choose another driver? If I had to choose another, could you recommend a driver suitable for frequencies from 60 to 250 Hz,

Since it will be 3-way loudspeaker, 10NMB420 will be an excellent midrange driver in 12-15 liters closed box, covering frequencies from 150 Hz to 2 kHz (3 kHz peak needs notch filter).
In general, professional 10" drives can't reach 60 Hz in closed box.

​

 

[voodooless]

Realistically, with DSP, the only requirement for your woofer is low fs, large Xmax and high power handling. The rest you can straighten out digitally. I think on DIYaudio there is a long thread with distortion tests of 10” PA woofers. Might be interesting to look at.

How about FaitalPro 10FE300?

 

[Ema79]

Thanks. After searching around a bit, I found this driver with a demodulation ring. It's a 12-inch unit. It seems to be of excellent quality. But I don't have the necessary expertise to understand it. Is it a good alternative? Thanks to everyone for your patience.
https://loudspeakerdatabase.com/SICA/12PF3

 

[voodooless]

That's a 12" woofer, though But Sica makes really nice drivers. I'm eyeing the 10S3CP myself. There is even a 4R version.

Also, Beyma, has some monsters, like 10MC700Nd, or 10MCS500. The MC7000 has a smoother response.