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Multi-Way Conventional loudspeakers with crossovers

Small active 3-way floor stander with a punch
Small active 3-way floor stander with a punch
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Old 10th October 2018, 04:23 PM   #21
nipper1 is offline nipper1  United States
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Join Date: Feb 2017
Quote:
Originally Posted by DannerD3H View Post
Hello nipper, Thanks for the input! Glad to hear more good things about SB!

It is time! I will start building on saturday!

I have one small question (more will probably follow xD). How do you guys seal the holes for internal wiring?
I use silicon based RTV (room temperature vulcanizing) "caulk" to seal seams and wire holes. There are variants that call themselves "adhesive/caulk"; some silicon based, others not. I give it 48 hours to cure even though the instructions say 24 hours.

I have been impressed with SB so far; I have some Satori 6 inch mids that really put many other higher priced drivers to shame! I have a few of there very basic drivers as well; same story though, much better than some other brands in their price range and above. My SB sub-woofer project isn't finished yet but I find it amazing that a "9 inch" driver in a small, closed box can put out very deep bass. Of course, the Hypex plate amplifier has numerous EQ, gain, X/O, etc. adjustments and plenty of power to "push" the SB that low. 16Hz is hard to come by; I am getting this in the small room. I have several recordings of pipe organ, 16 Hz comes from the 32 feet pipes!

Cheers and good luck!
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Old 10th October 2018, 08:02 PM   #22
DannerD3H is offline DannerD3H  Denmark
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Join Date: Jun 2013
Location: Denmark
And then just drill a overzised hole for the wires to allow room for "glue"?

I actually just recieved my MW19P's and started testing with them. They sure have a amazing build quality and also seem promising when it comes to sound! I still haven't had time to pay that much but currently this is my reponse at listening position with a MW19P in 22L.
Attached Images
File Type: jpg MW19P.jpg (181.5 KB, 286 views)
File Type: jpg Build.jpg (103.6 KB, 290 views)
File Type: png MW19P test.PNG (841.1 KB, 283 views)

Last edited by DannerD3H; 10th October 2018 at 08:05 PM.
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Old 10th October 2018, 08:08 PM   #23
DannerD3H is offline DannerD3H  Denmark
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Join Date: Jun 2013
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My subs will also be "pushed" into the lower frequencies with the DSP built into the Fusion Amps. I hope that my dual 10" will also be able to deliver some decent SPL in the sub 30Hz range! So far simulations says that 2 of my subs will reach 100 dB at 30 Hz. So with a total of 4 subs i should be in for a good low F3 point with room gain i hope
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Old 10th October 2018, 09:06 PM   #24
nipper1 is offline nipper1  United States
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Quote:
Originally Posted by DannerD3H View Post
And then just drill a overzised hole for the wires to allow room for "glue"?

I actually just recieved my MW19P's and started testing with them. They sure have a amazing build quality and also seem promising when it comes to sound! I still haven't had time to pay that much but currently this is my reponse at listening position with a MW19P in 22L.
Yep; over-size the hole then apply caulk/adhesive/glue (whatever) to both sides if possible. Make sure to get plenty into the wire hole. You might need to use tape to temporarily hold the wires from moving until cured (remove the tape after cure).

Looks good, I'm sure you will be very happy with the end results. Does your DSP have a filter for infra-sonic? My Hypex has a 12 Hz, 24 dB/Oct. highpass filter. This is especially important if you are playing vinyl because I've read that the warp frequencies are around 4 Hz. The sub-woofers could be going way past X-max if the record is warped bad enough!
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Old 11th October 2018, 12:46 AM   #25
LineSource is offline LineSource  United States
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Location: SiliconValley
Quote:
Originally Posted by DannerD3H View Post
Okay so i have been looking on subwoofer drivers again. Considering your advice on back to back woofers and I think I will be going with the SB driver: "SW26DBAC76-3-DV"

Also the cabinet design will change again.. I will just make it as one combined unit, this will allow me to move the Amp down to the bottom of the speaker, simpler design and more volume for the Sub's.
Thank you for sharing your excellent cabinet CAD work. I am surprised you gave up the flexibility of 2-cabinets, especially with a heavy duty side subwoofer like the SW26DBAC76-3-DV. The 300W SB model SW26DBAC76-3-DV with 2 * 2.4ohm voice coils should dim the lights!

My computer desk speakers use the MW19P-4 midwoofer and the SB29RDC-4 dome tweeter with a 1650Hz crossover. I used a 0.75cuft Parts Express cabinet, which leaves about 0.6cuft usable volume, and included a rear port which is easy to seal. I really enjoy low volume close up listening to the MW19P...

Listen to vocals.... your brain will notice... "that's how voices should sound"

Last edited by LineSource; 11th October 2018 at 12:54 AM.
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Old 11th October 2018, 08:40 AM   #26
DannerD3H is offline DannerD3H  Denmark
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Join Date: Jun 2013
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Nipper#
Thanks for the tips!

My DSP have free filtering possibilities from 10 to 25k Hz. So it should be possible to do pretty much anything
I never listen to vinyls (I don’t have a player – yet, at least :P), But will implement something like your filter I think.

LineSource#
I love to look at other people’s designs and drawings, so I kinda have to share :P
I realized that I can use the cabinet volume better this way – smaller speaker. It will also make the cabinet construction simpler.
Do you think I might regret the subs?
I actually talked to SB and they recommended that I used the 8-Ohm version instead. It will yield a slightly better performer and will use my amps as good as possible compared to the DV version.

Glad to hear you like the woofer. My first impressions are also good!

Can’t wait to have the new cabinets and actually mount the woofer properly and hear the Sub’s!!
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Old 11th October 2018, 04:40 PM   #27
jReave is offline jReave  Canada
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Actually I think 2 of those 26DBAC76-8 subs sealed in about 20L will do even better than you think they will. Attached is what Unibox shows for max SPL without exceeding xmax.

You're looking at more like 105dB at 30Hz and about 110dB at 40Hz.
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File Type: gif CB Response SB 26DBAC76-8.gif (31.7 KB, 224 views)
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Old 11th October 2018, 07:19 PM   #28
DannerD3H is offline DannerD3H  Denmark
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Hello again jReave!

Yes you are right, but i only have 250W of power for the two woofers to share, and as you see on your blue graph thats pretty much 100dB at 30 hz for 200W
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Old 11th October 2018, 08:22 PM   #29
jReave is offline jReave  Canada
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Ah ok. The drivers will have some headroom then. And that's funny. It's just by chance that I had 200W input.
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Old 11th October 2018, 09:48 PM   #30
DannerD3H is offline DannerD3H  Denmark
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Jep then i don't have to be afraid of them bottoming out! Thats a good thing
Haha but it was the right number!
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