Dual CSS SDX12 Ported/Sealed - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 71 Old 10-07-13, 08:24 AM
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Re: Dual CSS SDX12 Ported/Sealed

Quote:
caper26 wrote: View Post
that is just sick. Time to start an ID company...
No kidding! Great tools and knowhow + a unique and really cool looking design + good documentation/"customer-service" skills = that would be a cool ID company!

I am ready to see those Al panels on there!!!
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post #32 of 71 Old 10-07-13, 03:55 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

Patience, in time all the pieces will come togheter tonight I came one step closer but time rush away and it was too late for a real listening session. Did I mention I live in an apartment I think about them sometimes... I probably have the best neighbours in this neighbourhood.



Nearfield measure green line all vents open tuning seems to be close to 21-22hz (nearfield only shows the driver and doesn´t add the port gain or room gain)
Yellow one port blocked
Purple two ports blocked
Blue all ports blocked with towels not the real seal plate.

WinISD simulation with 21hz tuning and blocking of 1 or 2 vents the picture below the first is with added temp from 20degrees celsiuis to 90degress.


Picked out one 380ohms first but that was to much for impedance measurement had to add one more in parallel.


First time doing this kind of measurements but I wanted to be sure I got the tuning right before gluing the backside on.
With only one 380ohm resistance... it took alot of the voltage and left non to move the driver into any dB


Anothere with two 380ohms in parallel now I got some sound pressure when doing the sinus tones.
Blue line voltage drop on resistance red voltage at det subwoofer connectors.






Sweetspot measure have som trouble with 48hz. Green line all vents open, blue one vent blocked.


3 point room measure same as above with the vents.

Last edited by Vin Vendel; 10-07-13 at 04:00 PM.
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post #33 of 71 Old 10-07-13, 04:08 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

Lining the cabinet actually added some bottom end I only hoped for better heat displacement.

Compare the yellow line with the purple just above that is the difference and I will add about twice the amount filling when I´m done.
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post #34 of 71 Old 10-08-13, 01:28 PM
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Re: Dual CSS SDX12 Ported/Sealed

Hi
The sub in the corner get moore room gain .
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post #35 of 71 Old 10-08-13, 03:03 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

Yes I know My Onkyo 3007 has two sub-outs and seperate Audyssey calibration on those. After Calibration the right subwoofer was set to -5.5dB compared to the othere.

But I should have done the measurements above with that in mind but I didn´t see it until afterwards after Audyssey. When I have time for a listening session I will make some new measurements.
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post #36 of 71 Old 10-08-13, 03:05 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

Thanks for the heads up!

The last picture also is nearfield with one subwoofer placed almost in the middle of the room the two lines above are in front of the ports instead.
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post #37 of 71 Old 10-16-13, 12:50 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

Very happy with first impressions! clean output and heavy sound and more to come when they are played 20-30hours.

Bringing them back to the workshop tomorrow for final finish and paintjob.

I maybe did a little blooper when doing audyssey calibration I forgot a t-shirt in one of the subwoofers ports so wrong tuning there. And maybe one click louder on the right channel a bit uncertain because of some adjustments afterwards.
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post #38 of 71 Old 10-17-13, 03:48 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed

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post #39 of 71 Old 11-07-13, 03:24 PM Thread Starter
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Re: Dual CSS SDX12 Ported/Sealed



Happy to share this today
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post #40 of 71 Old 11-07-13, 03:54 PM
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Re: Dual CSS SDX12 Ported/Sealed

Excellent work! You could easily build custom enclosures for people as a side job.

-Jim

If you take yourself too seriously, expect me to do the exact opposite
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