SDX12 in a 2.1 (ft3) .....help!!! - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 14 Old 03-23-14, 02:04 PM Thread Starter
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SDX12 in a 2.1 (ft3) .....help!!!

I am not sure if this driver would behave well in a 2.1 ft3.

I have the bash 500 watts amp. Can someone help me model this driver in a net volume of 2.1 ft3?

Oh...!! I forgot....I have not include the displacement of the driver neither the volume of the 500 watts bash AMP.

I AM DYING TO SEE SOME MODELING CHARTS IF POSSIBLE FROM SOMEONE WHO REALLY KNOW THIS DRIVER.
I AM WILLING TO GO SEALED OF PORTED WITH ACURATE INFO.

THANKS.
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post #2 of 14 Old 03-23-14, 05:13 PM
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Re: SDX12 in a 2.1 (ft3) .....help!!!

Here is 2 cu.ft. sealed compared to 2 cu.ft. ported.

The volume is the net volume of the cabinet, to that you add the displacement of the driver, amp, bracing, and any porting.

A 22 hz tuning frequency would require a 4" round flared port 32" long.

SDX12 in a 2.1  (ft3) .....help!!!-sdx12.jpg




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post #3 of 14 Old 03-23-14, 08:08 PM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

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Mike P. wrote: View Post
Here is 2 cu.ft. sealed compared to 2 cu.ft. ported.

The volume is the net volume of the cabinet, to that you add the displacement of the driver, amp, bracing, and any porting.

A 22 hz tuning frequency would require a 4" round flared port 32" long.

Attachment 47642
Hummmm. The QTC OF 0.565 is equal to what low frequency aproximayely?

Also this driver is dual coil....so Should I wire them like this:

+ with + and - with - ?

Will this port is the best one to avoid compression?

Any modification in the bash amplifier?


Thanks one again.
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post #4 of 14 Old 03-23-14, 08:15 PM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

Quote:
Mike P. wrote: View Post
Here is 2 cu.ft. sealed compared to 2 cu.ft. ported.

The volume is the net volume of the cabinet, to that you add the displacement of the driver, amp, bracing, and any porting.

A 22 hz tuning frequency would require a 4" round flared port 32" long.

Attachment 47642
I forgot to tell you the the deep of the driver when mounted is 8 inches. And the wide is when mounted flat is 21 inches.

Does the form of the internal volume matters?
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post #5 of 14 Old 03-24-14, 03:00 PM
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Re: SDX12 in a 2.1 (ft3) .....help!!!

The port air speed is quite high with a single 4" flared port and 2 cu.ft. is too small for two 4" ports as they would need to be unrealistically long at 67" each.

Passive radiators would be a much better design.
Quote:

I forgot to tell you the the deep of the driver when mounted is 8 inches. And the wide is when mounted flat is 21 inches.

I'm not sure what you mean. Are you limited to a specific box size?




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post #6 of 14 Old 03-25-14, 10:04 AM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

"The port air speed is quite high with a single 4" flared port and 2 cu.ft "

Do you mean that there will be no compression? Or I will have some?

I got no problems with the size a of the port you gave me.

I just want to make sure everything goes accordenly the way it should. Also...Is there is some modifications procedures in the plate amp? What resistors o resistor should I use?
Also.....there is no ploblems conecting a DVC subwoofer with this bash amp right?
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post #7 of 14 Old 03-25-14, 10:12 AM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

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Mike P. wrote: View Post
The port air speed is quite high with a single 4" flared port and 2 cu.ft. is too small for two 4" ports as they would need to be unrealistically long at 67" each.

Passive radiators would be a much better design.

I'm not sure what you mean. Are you limited to a specific box size?
Well...Passive radiators could be the best...but...I am stuck with an enclosure in the form of a letter L .

I mean the 2.1 ft3 enclosure has a form of a letter L.
I am sure it has 2.1 ft3. That's why I asked if the form of my enclosure could be a problem.

You said that the air speed is quite high.....is this good? Or I would suffer compression?

Also.....what resistor should be applied on the BASH AMP TO MACH THIS DRIVER?

Thanks.
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post #8 of 14 Old 03-25-14, 11:11 AM
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Re: SDX12 in a 2.1 (ft3) .....help!!!

The air speed is 28 m/s so there will be compression, hopefully there won't be port noise.

No modification are needed for the amp, use it as is.

The driver needs to be wired in series for a 4 ohm load to use with the amp.

You say the cabinets is 2.1 ft3, is that the net volume after deductions are made for the displacement of the driver, bracing and port?




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post #9 of 14 Old 03-26-14, 05:42 PM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

Quote:
Mike P. wrote: View Post
The air speed is 28 m/s so there will be compression, hopefully there won't be port noise.

No modification are needed for the amp, use it as is.

The driver needs to be wired in series for a 4 ohm load to use with the amp.

You say the cabinets is 2.1 ft3, is that the net volume after deductions are made for the displacement of the driver, bracing and port?
No deductions of the amp space neither of the driver displacement has been made.So..... 2.1 net volume is what I have.

:-(
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post #10 of 14 Old 03-26-14, 05:46 PM Thread Starter
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Re: SDX12 in a 2.1 (ft3) .....help!!!

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Gioxtream wrote: View Post
No deductions of the amp space neither of the driver displacement has been made.So..... 2.1 net volume is what I have.

:-(
What's the perfect ported volume for this driver and the perfect ports length and diameter?

I am wondering if I can get a carpenter to add extra volume to my boxes that's all.

Thanks so much.
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