plans for sealed sub box for Infinity perfect 12.1

[TLS Guy]

so if you were me, you woudl sell them and get one kappa vq? build one rather than 2 with that driver?

Yes, I would. I would not consider wasting my time building cabinets for those for home use.

The kappa perfect VQ I believe is discontinued so you might have trouble finding one.

 

[cicatriz63]

just to reaffirm, i have the 12.1 in the avaserfi box and it sounds fantastic. although after reading this thread i would definitly go for the vq if i didnt already have the 12.1s laying around....

 

[WmAx]

The drivers are not appropriate for use in a sealed cabinet for home theater use. The excursion is not sufficient to produce appreciable SPL with low distortion under about 35-40Hz. If only intended for music, and no boosting is used under 35Hz, then it will perform superbly sealed with some minor EQ. The 12.1 drivers are superb - but not quite as robust for abuse as the VQ version. The 12.1 will work correctly in the Avaserfi cabinet. The 12.1 was never intended for a sealed cabinet - I have no idea why anyone(even Infinity) ever recommended it for that purpose in a car...

You will not make any gains in SQ with the VQ over the 12.1 in the proper ported cabinet. To repeat, the only difference is the VQ is more robust against physical abuse.

-Chris

 

[skers_54]

That kappa perfect 12.1 is a really nasty car thumper, and unsuitable for home audio.

You can see that it has a narrow band from 80 Hz to about 150 Hz, to really annoy others at traffic lights. A very evil device indeed!

That graph definitely doesn't look pretty, especially for a home sub. I bet it's not much different in the sealed box than the Kicker or MTX subs high schoolers are so found of (myself included ). Cars have a lot of cabin gain, but I doubt it is linear without significant EQ. I used the VQ in my Kappa build and it measures pretty flat down to 20 Hz. I'd like to see how it compares to bass from a full-range TL speaker like yours. Unfortunately building one would require more resources than I have atm.

 

[WmAx]

That graph definitely doesn't look pretty, especially for a home sub. I bet it's not much different in the sealed box than the Kicker or MTX subs high schoolers are so found of (myself included ). Cars have a lot of cabin gain, but I doubt it is linear without significant EQ. I used the VQ in my Kappa build and it measures pretty flat down to 20 Hz. I'd like to see how it compares to bass from a full-range TL speaker like yours. Unfortunately building one would require more resources than I have atm.

I am not sure what volume was used to simulate the above sealed response. However, in a 2 cubic foot sealed cabinet, the 12.1 is about -3dB at 38Hz and -6dB at 30Hz, roughly. You can even use a little boost, get it flat to 35Hz, and it will have very clean output for MUSIC application(s). But HT subwoofer use just is not a good idea, as high output to at least 25Hz is desired for a HT sub. Preferably 18-20Hz is the target. In the avaserfi box, the 12.1 will produce very substantial clean output in room to about 18Hz.

-Chris

 

[skers_54]

I am not sure what volume was used to simulate the above sealed response. However, in a 2 cubic foot sealed cabinet, the 12.1 is about -3dB at 38Hz and -6dB at 30Hz, roughly. You can even use a little boost, get it flat to 35Hz, and it will have very clean output for MUSIC application(s). But HT subwoofer use just is not a good idea, as high output to at least 25Hz is desired for a HT sub. Preferably 18-20Hz is the target. In the avaserfi box, the 12.1 will produce very substantial clean output in room to about 18Hz.

-Chris

That model was done with a volume of 1 cubic foot, which is what Infinity recommended. It seems odd that they wouldn't recommend a larger box, since the performance seems to increase dramatically. I guess it goes to show how important box design and proper modelling are to speaker performance.