A cheaper alternative to the Behringer Amps? - Page 8 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #71 of 102 Old 01-01-10, 04:59 PM
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Re: A cheaper alternative to the Behringer Amps?

Those are external dimensions. You need to account for the MDF material thickness (1"), driver displacement, bracing displacement, and if you want a plate amp, you'll also need to give a little for amp containment. Dont forget the driver baffle is 50mm thick to flush mount the driver.

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http://www.hometheatershack.com/foru...me-calculator/
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post #72 of 102 Old 01-01-10, 05:11 PM
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Re: A cheaper alternative to the Behringer Amps?

Wow, lots of posts. Just buy the Behringer already - you could have been listening to the finished sub by now.


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post #73 of 102 Old 01-01-10, 05:16 PM Thread Starter
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Re: A cheaper alternative to the Behringer Amps?

Quote:
Moonfly wrote: View Post
Those are external dimensions. You need to account for the MDF material thickness (1"), driver displacement, bracing displacement, and if you want a plate amp, you'll also need to give a little for amp containment. Dont forget the driver baffle is 50mm thick to flush mount the driver.

use this:

http://www.hometheatershack.com/foru...me-calculator/
Thanks for the link. My design, which is a downward firing one, would mean the bottom is 50mm thick right?

Still looking at about 90 litres though?

Box width - 26 inches
Box Height - 18 inches
Box Depth - 18 inches

Mat thickness - 1 inch
Bracing volume - 500 cubic inches (this was a guess including double thickness bottom, and internal brace)
Port Vol - 0
Driver Volume - 0 (couldn't guess this, but thought it would be no more than 3 litres)
No of Drivers - 1

Total Net Volume - 3.266 ft
Total Net Volume - 92.489 Litres

Last edited by tyler durden; 01-01-10 at 05:23 PM.
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post #74 of 102 Old 01-01-10, 06:14 PM
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Re: A cheaper alternative to the Behringer Amps?

I work in mm, as so does the place that cuts the MDF. Height is 23.6 inches (allowing for reduction due to extra driver baffle), width and depth are 17.7. That equates to 87.248 litres. minus 3 litres for driver and about the same for bracing and you end up with about 80 litres. This will be offset using acoustic wadding to give an effective volume of around 85 litres total but it will be reduced further if you use a plate amp unless I extend the cabinet so its outside of the calculated volume.
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post #75 of 102 Old 01-01-10, 06:18 PM Thread Starter
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Re: A cheaper alternative to the Behringer Amps?

Cheers.

Having a bit of a play with WinISD shows that seemingly fairly large changes in volume has very little effect on the plotted curve.
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post #76 of 102 Old 01-01-10, 09:06 PM
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Re: A cheaper alternative to the Behringer Amps?

Your Behringer is doing just fine because it's not running in bridged mode - his will be.

As I said before - either amp will do the job. I just think that for less money, you're still getting enough juice and a better feature set with the plate amp.

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post #77 of 102 Old 01-01-10, 10:43 PM
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Re: A cheaper alternative to the Behringer Amps?

The Behringer amp is probably the cheapest new amp you can get for a sub that's not a plate amp.

Also it's a very stable amp and will provide plenty of output. You can't even use it's full power with a normal household outlet. Behringer has their issues, but they also have a few good products. The EP2500 is one of them. Still on a budget I'd suggest the O-Audio.

You will not get 115db out of a sealed sub at 20hz. you couldn't probably handle that in our house anyway.
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post #78 of 102 Old 01-02-10, 08:12 AM
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Re: A cheaper alternative to the Behringer Amps?

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Cheers.

Having a bit of a play with WinISD shows that seemingly fairly large changes in volume has very little effect on the plotted curve.
Depends on what your looking at. TFM hardly changes, but look at other stuff like cone excursion and spl output and they change.
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post #79 of 102 Old 01-02-10, 08:13 AM
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Re: A cheaper alternative to the Behringer Amps?

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Your Behringer is doing just fine because it's not running in bridged mode - his will be.

As I said before - either amp will do the job. I just think that for less money, you're still getting enough juice and a better feature set with the plate amp.

Bryan
But I'm also running a 2 ohm load, which should be more difficult for the amp. IMO, power isnt really an issue with these amps.
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post #80 of 102 Old 01-02-10, 08:19 AM
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Re: A cheaper alternative to the Behringer Amps?

Yes. 2 ohms is more difficult but the amp appears by the specs to be more stable in stereo mode than in bridged mode. As you said though, you're not likely even close to using the full rated power of the amp so it's not as much of an issue.

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