Response Curve Question - Home Theater Sub

[TLS Guy]

Just two other points. Those long slot vents have to go round corners. They are not straight.

You can still EQ with the Bash amp. Get yourself an equalizer to go between the LFE out and the Bash. However 28 Hz is VERY low, and it will only be 6 db down at 22 Hz. Depending on your room that could even be a good thing. I would see how it sounds first before adding Eq, chances are you won't need it.

 

[MY99 2.5GT]

Alright I'm convinced on trying out a sealed enclosure. Thanks for all of the time and research.

We have a 1 year old who's learning to walk. So I am still planning to downward fire the subwoofer. Is there any way of figuring how much spacing there should be between the cone and the ground for optimal response?

Here's another factor to add . .

I have two of these Cerwin Vega 15.2's. With this in mind would there be any benefit to building a single chamber sealed box with both woofers sharing or go with individual chambers?

Maybe I'll build a finished/dampened coffee table style box for both and run them temporarily off of the one BASH 500W. If it seems strained I'll add another down the road.

What would you guys recommend for wiring two subs with dual 2ohm coils. In my head I come up with either a .5ohm, 2ohm, or 8ohm load to my single channel plate amp. I'm sure it won't be putting out anywhere near 500rms at 8ohms but its looking like this is going to be my only choice. I don't know about pushing this amp at 2ohms.

 

[MY99 2.5GT]

Wait a second . .

WinISD shows -9db @ 22Hz for a sealed 2 cubic foot enclosure. I tested it up to 5 cubic feet and still -9 @ 22Hz.

How were you getting only -6 @ 22Hz with the VMAX 15.2?

What about passive radiator, bandpass, or isobaric configuration for these woofers?

 

[TLS Guy]

Wait a second . .

WinISD shows -9db @ 22Hz for a sealed 2 cubic foot enclosure. I tested it up to 5 cubic feet and still -9 @ 22Hz.

How were you getting only -6 @ 22Hz with the VMAX 15.2?

What about passive radiator, bandpass, or isobaric configuration for these woofers?

Box pro shows it 9db down at 20 Hz, and about 6db down around 22Hz. That is what you would expect with second order roll off, which a sealed box should have.

I did try an isobarik, but that was no help, the port dimensions did not work. I don't like band pass, and the parameters don't look good. I suspect a passive radiator would work. The trouble is there are so few available and I doubt you would find a match.

 

[TLS Guy]

Alright I'm convinced on trying out a sealed enclosure. Thanks for all of the time and research.

We have a 1 year old who's learning to walk. So I am still planning to downward fire the subwoofer. Is there any way of figuring how much spacing there should be between the cone and the ground for optimal response?

Here's another factor to add . .

I have two of these Cerwin Vega 15.2's. With this in mind would there be any benefit to building a single chamber sealed box with both woofers sharing or go with individual chambers?

Maybe I'll build a finished/dampened coffee table style box for both and run them temporarily off of the one BASH 500W. If it seems strained I'll add another down the road.

What would you guys recommend for wiring two subs with dual 2ohm coils. In my head I come up with either a .5ohm, 2ohm, or 8ohm load to my single channel plate amp. I'm sure it won't be putting out anywhere near 500rms at 8ohms but its looking like this is going to be my only choice. I don't know about pushing this amp at 2ohms.

Your impedance options are correct. Unless you use two amps there would be no advantage to putting two drivers in the box. If you do use two drivers you will have to double the box volume.

A driver that big I would keep 4 to5 inches off the floor if downward facing.