Re-designing OB 3-way speakers, help needed.


2004-03-02 10:43 pm
It's been a few year since I build my dipoles. I build them with an H-baffle for the woofers (Dayton 15" IB, one per speaker) and "straight baffles" put on top of the woofers housing so to speak Dayton Reference 7" alu and B&G Neo 8.

Woofers have been actively filtered via a DCX2496, the mids/highs passively filtered.

I haven't measured them or anything. I just really liked how they sounded.
Now I have had to get rid of the 200W/8ohms per channel powering the woofers some time ago and driving them with an Arcam Alpha 8P and a TA2022 amp isn't really the same.

I also need to minimize their footprint in the room, so I thought I might go from separate baffles to one for all three elements and making it very tall(?).

I'm not a speakerdesigner by a longshot, I got lucky when building these.

Anyway, would a plain OB that's about 50cm wide and, almost, however tall it needs to be work? 50x180cm wouldn't be a problem as an example.
I was thinking of having the baffle leaning slightly "backwards".

It's been so long since did anything with speaker DIY that I've forgotten how I calculated from where to add compensation, where to put LP and HP for the woofers etc.

I don't think I've used the DCX to it's potential as I haven't measured the room etc, but I'm thinking about buying or building a mic to measure via REW that I recently found out about doing some research for the re-design.

I'm grateful for any and all help in this endevour.

Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
Dayton Audio RS180S-8 7" Reference Shielded Woofer 8 Ohm
Bohlender Graebener Neo8 Planar Transducer


2004-03-02 10:43 pm
I am sure that after some days-weeks of measuring-tweaking session you will get quite different and better sound!
You should make the baffle much narrower for the Neo8 too.

Some guidelines here - I am a disciple. (for minidsp but DCX can do the same)
Prototyping a 4-way open-baffle speaker with the miniDSP 2×4
Refining a 4-way open-baffle speaker with the miniDSP 2×4

Thanks for your reply.
I guess it would be hard to get a large baffle and still get the best conditions for the Neo8...