Hello, my first post, i've completed my first Subwoofer. :) I'm into subwoofer building, here's my first project completed;
I'm goin' to built one for my Earthquake Magma (1500w)
Here's my infinity Subwoofer;

http://www.rc-norway.com/uploads/1236317224.jpg

SPECIFICATIONS
General
Power Handling, RMS: 300 Watts
Power Handling, Peak: 1250 Watts
Sensitivity : 93dB
Frequency Response: 23Hz - 400Hz
Mounting Depth: 5-1/16" (129mm)
Impedance: 4 Ohms

Hello, my first post, i've completed my first Subwoofer. :) I'm into subwoofer building, here's my first project completed;
I'm goin' to built one for my Earthquake Magma (1500w)
Here's my infinity Subwoofer;


SPECIFICATIONS
General
Power Handling, RMS: 300 Watts
Power Handling, Peak: 1250 Watts
Sensitivity : 93dB
Frequency Response: 23Hz - 400Hz
Mounting Depth: 5-1/16" (129mm)
Impedance: 4 Ohms

Looks pretty decent for a first project. How about some more details:

Which driver?
What amp are you using?
Sealed/ported? If ported what's the box tuned to?
Box volume?

Also, you may find more interest in the DIY speaker/sub forum here:
http://www.avsforum.com/avs-vb/forumdisplay.php?f=155

Hello, my first post, i've completed my first Subwoofer. :) I'm into subwoofer building, here's my first project completed;
I'm goin' to built one for my Earthquake Magma (1500w)
Here's my infinity Subwoofer;

http://www.rc-norway.com/uploads/1236317224.jpg

SPECIFICATIONS
General
Power Handling, RMS: 300 Watts
Power Handling, Peak: 1250 Watts
Sensitivity : 93dB
Frequency Response: 23Hz - 400Hz
Mounting Depth: 5-1/16" (129mm)
Impedance: 4 Ohms


If the circles near the bottom are not ports, what else could they be?

It's ported.. It's a BandPass Ported case. :) I'm not sure how low it's goin, but it moves everything on my room away up'n down, hehe:D
The Case/Cabinet thing is on about 70L if i remember right. :)
INFINITY REFERENCE 1250W - 300mm Single Voice Coil Subwoofer
I also run it on my 2 Amplifiers - LUXMAN 600W x 2 and my Onkyo...