Frode

Here's a DIY version of something similar: http://www.speakerstore.nl/index.php?l=nl&pg=12&prjID=33 http://www.speakerstore.nl/index.php?l=nl&pg=11&c=61 Frode

Here's a post where djk explains more about the filter: http://www.diysubwoofers.org/talkshop/messages/35659.htm Frode

Marvel, no problem! Here's a link to the thread on the Oris forum: http://www.bd-design.info/forum/reply.php?id=6640,6640 Homemade, the EQ is done by a hipass filter with Q=2 at 31Hz. This is the same as 6dB EQ at 31Hz. I have a spreadsheet simulating this but unfortunately I don't no how to post a graph from it. With no room effects the ported/EQ'ed box is almost flat from 30Hz, and the sealed stock box is almost 14dB down compared to this. Above ~100Hz there isn't much effect from the porting/EQ'ing, but here the horn loading starts. So the combination of the horn and the port/EQ makes the response quite flate. Frode

Just to clear up some things. I never posted any numbers on the performance of the modified bin. This was done by some other Oris owners who used the K33E and no EQ. I used the JBL 2226H and 7dB EQ at 32Hz.I also tried shorter ports/no EQ, but in my opinion the long port/EQ sounded best. Frode

It looks very interesting, how much does it cost? Too much for me I'm afraid! I'll just have to stick with DIY subs made from the two JBL SUB1500 that arrived today. Frode

BackBurner, I used the first drawing at this page: http://www.audiofanatic.it/Piani_costruttivi/pic_piani/LaScala/LaScala.html Frode

The additional box is ~2.6 cu.ft, which gives a total of ~4.8 cu.ft. The ports are 4" x 12.5". I use ~7dB EQ at 32Hz. I guess you can change the numbers a bit, but not much. Frode

No, unfortuantely I don't have any plots. I used the JBL 2226H. I've attched a pic of the inside too. Frode

I built them from scratch. The ports are autosound items, you should get them in a car audio shop. The setup sounds good, but I think it can be better. I use an active XO on the bass(200Hz, 12dB/oct), nothing on the Oris. I hope some changes in the XO will give me even better sound. Frode

More.

Pictures as promised! Frode

You're lucky to have the Oris 150. I have the Oris 200 and it looks way too small on top of the new bass bins. As I said, pictures are on their way. Frode

I just had the bass part, so I made an additional chamber (same size as the original top box) and put this "below". But to keep my Oris horn at ear level, I've put the bass bins on their side. They are now ~35" wide and ~24" tall. Frode

I've just done the mod on my LS bass bins. They now look like the original LS with mid/tweeter horn replaced by two 4" ports. I'll have pictures ready in a week or so. Frode

I think my additional box was around 9" internal height. Frode