Need Sub..small footprint

[Sheep]

And that is completely wrong. A properly built vented sub will have much more low end extention than a properly built sealed unit (no eq, or feedback loop on either). The reason is, you are using the box and port to effectively double the output of the unit in a given frequency band. This lets you use both sides of the woofer to produce sound waves, instead of one like in a sealed unit.

Tune them the same and the sealed will go lower.

SheepStar

 

[MacManNM]

Tune them the same and the sealed will go lower.

SheepStar

Please learn some physics. How exactly do you tune a sealed enclosure? It isn't supposed to add to the sound of the unit, whereas a ported unit does.

 

[Sheep]

Please learn some physics. How exactly do you tune a sealed enclosure? It isn't supposed to add to the sound of the unit, whereas a ported unit does.

Using the box size. If you have a ported sub tuned to 20Hz, and a sealed sub in the proper sized enclosure with an FS of 20Hz, the sealed will go lower due to its shallower roll-off.

SheepStar

 

[Buckeyefan 1]

Tune them the same and the sealed will go lower.

SheepStar

The benefit of a ported box (and a bandpass) is it produces less distortion than a sealed box. A sealed enclosure exhibits the best transient response, but distortion can be an issue if the air spring effect is overblown with too much power.

Tune them the same with a weak amp, and the sealed will crap out on you. You need big power with a sealed enclosure. Ported is all about efficiency.

 

[MacManNM]

Using the box size. If you have a ported sub tuned to 20Hz, and a sealed sub in the proper sized enclosure with an FS of 20Hz, the sealed will go lower due to its shallower roll-off.

SheepStar

Optimum anechoic response as predicted by winISD vented vs sealed for a Titanic 15” woofer. FS of 19 something. This is the optimum size for good transient response. 3.1 ft^3 for sealed and 6.4 ft^3 ported.

Now here is the response for a larger sealed enclosure, 100ft^3

And here for a smaller enclosure 1 ft^3

Green is vented.

 

[Sheep]

Optimum anechoic response as predicted by winISD vented vs sealed for a Titanic 15” woofer. FS of 19 something. This is the optimum size for good transient response. 3.1 ft^3 for sealed and 6.4 ft^3 ported.

Now here is the response for a larger sealed enclosure, 100ft^3

And here for a smaller enclosure 1 ft^3

Green is vented.

OK, a ported sub performs better. Now, lets all go get 7 cubic foot boxes and put them in our houses.

SheepStar

 

[MacManNM]

OK, a ported sub performs better. Now, lets all go get 7 cubic foot boxes and put them in our houses.

SheepStar

I never said that. I said they will go deeper. Now, you are wrong, plain and simple. A dayton titanic 10" doesn't need a 7 ft^3 box. It likes a 1.65 ft vented enclosure. look at BM's unit he built (which I am sure will outperform a PB10 or a HSU STF2 for all around use) for less than $200 and his time.

You are starting to sound like mrty here.

 

[MACCA350]

BTW those Velo's were measured with the EQ off.

cheers

 

[Sheep]

I never said that. I said they will go deeper. Now, you are wrong, plain and simple. A dayton titanic 10" doesn't need a 7 ft^3 box. It likes a 1.65 ft vented enclosure. look at BM's unit he built (which I am sure will outperform a PB10 or a HSU STF2 for all around use) for less than $200 and his time.

You are starting to sound like mrty here.

Wait, Take those measurements, and make the sealed and ported subwoofer in the same size boxes. Put them BOTH in a 3.1ft^3 box. Lets see how each performs with the same size (smallest) box.

 

[j_garcia]

I've heard the DD-15 and I can tell you that it doesn't have the same feel as my large enclosure, vented 15. The DD is has more accuracy with the EQ on, but.

Sheep, how would a given driver in the same size vented box not be more efficient? With a sealed design, the driver is essentially "fighting" the internal volume of the enclosure, which is also responsible for the "tight" sound a sealed sub generally yeilds. That is fact, not theory.

BTW those Velo's were measured with the EQ off.

The driver is still servo controlled.

 

[MacManNM]

Wait, Take those measurements, and make the sealed and ported subwoofer in the same size boxes. Put them BOTH in a 3.1ft^3 box. Lets see how each performs with the same size (smallest) box.

So now you want to make a sealed enclosure optimized for woofer X and compare it to a non optimized vented enclosure for the same woofer? Gee that’s intelligent. I wonder which would perform better? That’s about as smart as the 4 ohm vs. 8 ohm thread. And you want to be a moderator?

 

[Sheep]

So now you want to make a sealed enclosure optimized for woofer X and compare it to a non optimized vented enclosure for the same woofer? Gee that’s intelligent. I wonder which would perform better? That’s about as smart as the 4 ohm vs. 8 ohm thread. And you want to be a moderator?

It will prove that in the same size box, a sealed subwoofer will play lower.

You can't have a ported sub double the size of a sealed sub and say its a fair comparrison.

SheepStar

 

[j_garcia]

That's how it works though. The box has to be designed for the driver in question, otherwise you aren't comparing anything... That's like saying I'll compare how a race motor performs at the track in an Indy car vs a street car.

 

[zumbo]

Sealed subs rule.

 

[fergusonv]

I agree with j_garica on this one. You can't compare two enclosures unless they are each designed/implemented correctly. Sealed subs and vented subs each have thier advantages. Personally, In 99% of cases I wouldnt go with a sealed sub without a linkowitz transform cirucut.

 

[Sheep]

That's how it works though. The box has to be designed for the driver in question, otherwise you aren't comparing anything... That's like saying I'll compare how a race motor performs at the track in an Indy car vs a street car.

No, I'm saying how do a car engine's of the SAME cubic inches perform when using a different intake system.

This proves, that cubic foot for cubic foot, a sealed sub will perform better. Obviously, if the ported subwoofer gets a box DOUBLE the size it can haul A$$, same with an engine with a larger displacement.

SheepStar

 

[mulester7]

No, I'm saying how do a car engine's of the SAME cubic inches perform when using a different intake system.

This proves, that cubic foot for cubic foot, a sealed sub will perform better. Obviously, if the ported subwoofer gets a box DOUBLE the size it can haul A$$, same with an engine with a larger displacement.

SheepStar

.....but don't forget, Sheep, with a sealed box, the engine may be half the size, but the price of gas at least doubles......

 

[MacManNM]

It will prove that in the same size box, a sealed subwoofer will play lower.

You can't have a ported sub double the size of a sealed sub and say its a fair comparrison.

SheepStar

Then by that logic, double the size of the sealed enclosure and see which performes better.

 

[Sheep]

Then by that logic, double the size of the sealed enclosure and see which performes better.

Its easier to have a smaller sub thats not ported then a ported on that double the size.

Your missing the point. The sealed sub need more power, but is half the size. For most, they will go for the smaller sub.

SheepStar

 

[MacManNM]

Its easier to have a smaller sub thats not ported then a ported on that double the size.

Your missing the point. The sealed sub need mroe power, but is half the size. For most, they will go for the smaller sub.

SheepStar

Dayton titanic 10", .7 ft^3 enclosure. The one with the better response is the vented. Now shut up already.