what are some key characteristics to make a box as efficient as possible??
-Drew
Replies (8)
swez on 01/23/2008 18:24:43
There's one design that a few guys really like if there's enough space for the sub choice. It's called the "Wicked One" byDecware. It's a dual horn loaded BP design. Very complex to make, but it is very efficient. Have a look:
http://www.decware.com/newsite/mainmenu.htm?/whorn.htm&intro
Swez
newB on 01/23/2008 18:42:48
wow thats impressive, so you HAVE to pay for the blueprints?
-Drew
Ash on 01/23/2008 20:30:19
Ever heard of Hoffman's Iron Law? There is always a price to pay. You must choose which one you are willing to sacrifice......
newB on 01/24/2008 03:56:20
if only i had an extra 10cuft to fill!!!
even the "compact" model doesnt fit any application i can think of
-Drew
cplkittle on 01/24/2008 09:09:27
A lot of us use winisd to tweak enclosures to perform the way we want them. post the T/S parameters of the sub, and we will kick around some ideas for you.
newB on 01/24/2008 11:06:44
back story is that i was just torn apart by the local shop in a big acoustic physics debate and one of the phrases he really emphasized was high efficiency within the box, hence this list i need to see if i'm missing anything!!
-Drew
MrBrownstone on 01/24/2008 13:36:58
Remember, you're not making an efficient box, you're making the WOOFER more efficient.
Using vents to maximize woofer performance is frequency specific. Whatever enclosure you choose to utilize, it'll always come at a price. That price is either frequency response, transient response, or enclosure volume.
It's all application specific.
cplkittle on 01/26/2008 20:56:27
Well stated, Mr B.
Sound comes from both sides of the speaker cone. Ported boxes do 3 things:
1) Decrease backpressure allowing the sub to move more freely and increase travel (xmax) over a sealed box.
2) Harness the backwave and rebroadcast it through a tuned port.
3) Filter or dimish sound waves of all other frequencies than those that will travel from the port.
so basically you have a frontwave that sends off all frequencies not filtered by LPF, HPF, or SS electrical filters; and a backwave that peaks at the port tuned frequency and by design physically filters out non port tuned frequencies.
Efficiency comes in by reducing the back pressure on the sub at non port tuned frequencies, and setting the backwaves to resonate at the port tuned frequency so that the cone of the speaker travels the least when the woofer and its enclosure are producing the most sound.
-Drew
Replies (8)
swez on 01/23/2008 18:24:43
There's one design that a few guys really like if there's enough space for the sub choice. It's called the "Wicked One" byDecware. It's a dual horn loaded BP design. Very complex to make, but it is very efficient. Have a look:
http://www.decware.com/newsite/mainmenu.htm?/whorn.htm&intro
Swez
newB on 01/23/2008 18:42:48
wow thats impressive, so you HAVE to pay for the blueprints?
-Drew
Ash on 01/23/2008 20:30:19
Ever heard of Hoffman's Iron Law? There is always a price to pay. You must choose which one you are willing to sacrifice......
newB on 01/24/2008 03:56:20
if only i had an extra 10cuft to fill!!!
even the "compact" model doesnt fit any application i can think of
-Drew
cplkittle on 01/24/2008 09:09:27
A lot of us use winisd to tweak enclosures to perform the way we want them. post the T/S parameters of the sub, and we will kick around some ideas for you.
newB on 01/24/2008 11:06:44
back story is that i was just torn apart by the local shop in a big acoustic physics debate and one of the phrases he really emphasized was high efficiency within the box, hence this list i need to see if i'm missing anything!!
-Drew
MrBrownstone on 01/24/2008 13:36:58
Remember, you're not making an efficient box, you're making the WOOFER more efficient.
Using vents to maximize woofer performance is frequency specific. Whatever enclosure you choose to utilize, it'll always come at a price. That price is either frequency response, transient response, or enclosure volume.
It's all application specific.
cplkittle on 01/26/2008 20:56:27
Well stated, Mr B.
Sound comes from both sides of the speaker cone. Ported boxes do 3 things:
1) Decrease backpressure allowing the sub to move more freely and increase travel (xmax) over a sealed box.
2) Harness the backwave and rebroadcast it through a tuned port.
3) Filter or dimish sound waves of all other frequencies than those that will travel from the port.
so basically you have a frontwave that sends off all frequencies not filtered by LPF, HPF, or SS electrical filters; and a backwave that peaks at the port tuned frequency and by design physically filters out non port tuned frequencies.
Efficiency comes in by reducing the back pressure on the sub at non port tuned frequencies, and setting the backwaves to resonate at the port tuned frequency so that the cone of the speaker travels the least when the woofer and its enclosure are producing the most sound.
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