A month ago i went to a friend and i metered my car with a termlab.

The number is impressive!

139.9 at 39Hz!! I didn't expect so much!

Here is the foto:

The box:

ar: nissan sunny '89 sedan 4D

no electric upgrades

sub: alpine typer 1222d

box: 2cf at 32Hz

amp: sinus sla 1500 (1500w - 1ohm)

HU: alpine 9812rb

engine on at 2000rpm, doors windows closed, sensor on the dash

congrats!

Too many 9's

You need to bump that score up

Type R's get surprisingly loud for what they are.

Yes it's very good score at low Hz, but this is with around 1.2-1.3Kw (the voltage during the burp was at 12.6v). This is too much for a typer...

Maybe i'll try to build a box at higher tuning freq and perhaps i will see even higher numbers...

Edited February 13, 200817 yr by tasos

A type R can take 2000 watts rms for a burp. I played 10,20,and 30Hz test tones on my Type R for 3 minutes, a full minute of each with 1200 watts

I was trying to blow it. All I got was a little smell. This was in a transmission line enclosure also so the only thing controlling the cone was the air mass in the line and the suspensions

Edited February 14, 200817 yr by aznboi3644

A week ago i built another box for my Alpine in order to do over 140dbs.

The box i built is 2cf at 37Hz and yes i did 140.4db at 42Hz!

Nice. I assume thats with he same amount of power? Hows the sq with the new box compared to the 32hz box?

With the 32Hz box the Alpine hits the lows much better, in the higher freq is ok and has very nice sq.

With the 37Hz box the sq isn't that good. It hits much harder the higher freq, but in the very lows is just ok.

Bettwen 32 and 37Hz box, i prefer the 32. The 37Hz bix is generally more boomy.

I'll try a box at 34Hz. Maybe it will be the perfect for me.

Two days ago, i built a new box 2.18cf@33Hz and i did 141.0db @ 42Hz !

http://img227.imageshack.us/my.php?image=42hzue2.jpg

I'm very satisfied with the result

Edited September 16, 200816 yr by tasos