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Multi-Way Conventional loudspeakers with crossovers

3-way studio monitor design
3-way studio monitor design
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Old 14th February 2019, 07:30 PM   #1
enricofiocco is offline enricofiocco  France
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Join Date: Mar 2010
Default 3-way studio monitor design

Dear Diyaudio community,
I'm currently working on a project for a 3-way monitoring system for mixing and mastering and I'm looking for some advice.
I mix and master mainly acoustic and classical music. I currently work with lipinski 707 + diy subs that I will keep, but have to go surround and 3 more lipinski are out of my budget.

The speakers will be amplified with hypex fusion amp, so crossover will be very flexible, and I have the possibility to do measures in a well sounding room.
I've build successfully two different designs from Troels Gravesen that turned out well, so I've some little experience.

My budget is 700Ä/speaker maximum. I would like to have sealed speakers, I'm used to this kind of sound.

The driver that I've selected are:
tweeter: Scan-speak R2604/832000 with modded WG-300 waveguides (adaptors and cut to have them 1cm closer to the mid unit)
low-mid: Scan-speak 15W/4424G00
woofer: Dayton audio RSS210HF-4

I'll start experimenting on crossover at 250Hz and 2.2kHz
The internal dimensions of the enclosure will be 50x20x23cm
There will be a separation that gives around 15 litres for the woofer and 3 litres for the mid.
Drivers, heavy bracing and plate amps take the rest to reach the 23 litres total.

Iím thinking at a WTM configuration, primarily for the reason thatís is simpler to separate de enclosure for the midwoofer and maybe for less diffraction.


What are your opinion on this choice?
Would it be a good idea to do an asymmetrical or particular shape of internal mid compartment to minimise resonances and back reflections?

Do you see any problems on this design?


Images are front panel design, and W and M drivers with the volumes i'd like to use.


Thank you very much, kind regards

Enrico
Attached Images
File Type: png Screen Shot 2019-02-14 at 21.28.07.png (370.1 KB, 607 views)
File Type: png Screen Shot 2019-02-14 at 21.22.41.png (18.8 KB, 597 views)

Last edited by enricofiocco; 14th February 2019 at 07:36 PM. Reason: images problem
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Old 14th February 2019, 08:00 PM   #2
WaVeInFoRm is offline WaVeInFoRm
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Join Date: Dec 2011
Location: England
I Like It

I would say lighn the boxes well and potentially raise the pitch of the crossovers.

at a guess 450 and 3.3

just a bit higher for both I sense. best ask the professionals...

prehaps 333 and 3.3

Last edited by WaVeInFoRm; 14th February 2019 at 08:05 PM.
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Old 14th February 2019, 08:38 PM   #3
enricofiocco is offline enricofiocco  France
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thanks, yes i'll play around with the xover points. I'd like to use 2nd order.

However R2604/832000 can play well 2.2k, and it's around the freq where 15W/4424G00 starts to beam...
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Old 14th February 2019, 09:07 PM   #4
spendormania is offline spendormania  Germany
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Hi Enrico,

my advice is: choose another woofer. I tried to use the Dayton RSS in a similar configuration and failed. Its output is too low (around 82 dB) and everything at this woofer is optimized for the use as a subwoofer. Just grab the woofer and hit with a knuckle against the diaphragm. You will hear the ringing of the resonant-peak.

I know, bad news. But that's the way it is.
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Old 14th February 2019, 09:53 PM   #5
enricofiocco is offline enricofiocco  France
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Join Date: Mar 2010
Hey Spendormania,


that's a really bad news... they're cheap and go very low for 8".
I read in the forum that Guzauski Swist uses RSS315 in their GS-3...
Ok that is 12", and sure it play louder, but I think they cross around 380hz to the atc dome.
Do you think it's a bad idea even if I cross lower, let's say 150Hz and use 18W/4424 for mid-lows?
If not what would you suggest to use in that price range?
Thanks a lot!
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Old 14th February 2019, 10:04 PM   #6
enricofiocco is offline enricofiocco  France
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These are my simulation for RSS210 with speakerboxlite.com.
Red is sealed in 16 lt. Green ported, tuned to 25Hz, in 26 lt.
Of course xmax of 9mm has to be considered and resonances and ringing it's bad!

Regards
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Old 14th February 2019, 10:18 PM   #7
enricofiocco is offline enricofiocco  France
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or I could make the cabs bigger and use Visaton TIW 200 XS in 30l sealed...
the xmax of the TIW200 is +/- 12,5mm... not bad at all!
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Old 14th February 2019, 10:25 PM   #8
plasnu is offline plasnu  United States
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I used to own L707. It was a bit soft sounding for my work, but I'm sure it should be great for classical music!

I have never seen commercial WTM small monitor like this. Anyone makes something like this?
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Old 14th February 2019, 10:39 PM   #9
enricofiocco is offline enricofiocco  France
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I came to L707 from PMC IB1 and after the first shock I began to like them a lot. I run them with 2x12" diy subs (Evidence LAB12, 45l, sealed, used as stands).

Never seen WTM in studio monitors, but I can't see any problem for it....
Regards
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Old 14th February 2019, 10:43 PM   #10
WaVeInFoRm is offline WaVeInFoRm
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Seas H1288-08 CA22RNX 8 inch woofer | Loudspeaker freaks
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