New 3way Project. Advice?

[Mutley666]

To all the veterans of DIY speaker building! Please give me your advice on this project. I am planning to build some 3way speakers for my home cinema using the following drivers;

5000Hz - 25000Hz - 2 x BG Neo 3PDR ribbon drivers
(http://www.partsexpress.com/pdf/264-716s.pdf)

300Hz - 5000Hz – 2 x Tang Band W4-657SC
(http://www.lautsprechershop.de/hifi/index_en.htm)

35Hz – 300Hz – 2 x Alcone AL6.5 HE
(http://www.lautsprechershop.de/hifi/index_en.htm)

I’m planning to use the drivers in WMTMW configuration, and build the cabinets into the recesses either side of the chimney in my main room (5m X 5m), so the enclosure will be a maximum of 260mm X 320mm X 2500mm and fit flush with the front of the chimney. The drivers for low mid and high freq will be built into their own sealed enclosures.

The speakers primary use will be HT, but I will be listening to a lot of music with them as well, so I would like them to have a frequency response of at least 35Hz – 20000Hz (anything below will be taken care of by my active subwoofer)

Are there any major holes in the preliminary design, or anything I will need to take into consideration when designing the crossover (this is my first 3way design by the way)? Any advice will be much appreciated!

[tiroth]

I don't think it will work. You are going to have a ~6" long planar tweeter, which means the vertical dispersion will be tight -- the tweeter will have to be on the listening axis, at ear height or pointed at your ears. That isn't a problem as much as a design consideration. What throws a wrench in it is
1. MTM
2. High crossover frequency
3. C2C spacing

Those mids are going to end up a good 9-11" apart. Check out what the polar response of just the mids looks like at 9" (228mm) seperation, at 5kHz.

[Mutley666]

tiroth

"You are going to have a ~6" long planar tweeter,"

The BG Neo3 PDR is only 3.5 inches tall (I think you refereing to the Neo 8), so the mids will end up with a distance of 7.5 inches between the centre of the cones.

I'm trying to get something similar to the Visaton Concorde Kit
http://www.visaton-bausaetze.de/hifi...visaton_fr.htm

[tiroth]

Was that a typo then about using two tweeters?

[Mutley666]

Yeah! my fingers obviously tpye faster than my brain can keep up!!!

Doh!

I'll only be using 1 Neo 3 per side, with the 2 TBs as midrange and the 2 Alcones for low frequencies.