best sub and amp?

Ok then the box is too small.. however, I did not have much luck with the other one (SBR-122CR) that I still have (and is at my brother's apartment now) which is made by Alpine, prefilled with another Type R 12",but I did not find the quality of bass sound of that really any better either. Here's the details of it: It is the SBR-122CR 12" Compound Reflex Subwoofer Box 2ohm (4ohm + 4ohm).   I tried this for about 2 months and thought maybe I have to break-in my sub. That did not work either. At home, I did not bridge it but used the two 4ohm coils in series and made it 8ohm and connected it to the left channel speaker while keeping my right channel to the regular 3way speaker so I could compare with my balance. I then even tried to make the speaker have 4 ohm by using just one coil. Still not much difference in sound quality. I even tried in parallel to effect 2ohm. Nothing made a big advancement in quality.

markcars wrote: So the internal dimensions are : 14" wide, 13.5 inch high, 9" deep.

If these are accurate internal measurements, I see .85 ft^3, taking the sub's .128 displacement into consideration.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

I am willing to build a larger box than the small one I tried last, but I don't understand how it will be better since I already tried the Alpine box SBR-122CR whose dimentions are: (W x H x D) inches 22-1/2” x 17-9/64” x 16” That did not sound any much better really. That's why I removed it after 2 months and put back my small box that sounded almost same.

Yes stevdart, they're quite accurate internal measurements to the 1/8th " tolerance level. I took my tape measure and actually measured the insides of the box last night.

stevdart wrote: markcars wrote: So the internal dimensions are : 14" wide, 13.5 inch high, 9" deep. If these are accurate internal measurements, I see .85 ft^3, taking the sub's .128 displacement into consideration.

I used the volume calculator on this site and got .65 cf square. If you subtract the sub's displacement from that enclosure then it =.52 cf square

14 * 13.5 * 9 = 1701 / 1728 = 0.984 - .128 = 0.856Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Try it on the site calculator is all I can say....

I got the same thing.  Put in a zero for wall thickness when determining inside dimensions.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.