[Siankovic]

I'm new to this forum, but after having glanced around the net it seems there are a lot of people within this forum who have hands (and ears) on experience with dipole/ripole subs. The project evolves around 16 10" woofers I got my hand on through a real bargain. The drivers are 50 Ohms versions of the Scan-speak aluminium 8567-1. They are going to supplement a couple of Phoenix dipoles from around 100Hz and downwards. I have contemplated both H and U baffle linear arrays, but I think I'd prefer stacked ripoles with the drivers horizontally mounted (Eight each side). I been reading around diy forums, but I haven't really come about anyone who has build something similar. It's mostly been drivers vertically mounted in W baffles, but I'd rather have the visual simplicity of stacked ripoles. My livingroom is approx 30m2 (5m * 6m). Everything is going to run through a software-based crossover using Thuneau's frequency allocator so a lot of EQ'ing is possible. My question is therefore if there is a acoustic reason that this mounting isn't that widespread? I'm mostly concerned about floor-reflections and cancellation due to unequal distance to the listening height. But I take it that it's not too important considering the wavelenghts involved. All inputs welcome.

Regards

[Paul W]

Haven't heard this system but it apparently received good reviews in Munich. 

http://www.tnt-audio.com/shows/munich07b_e.html

[Rudolf]

My question is therefore if there is a acoustic reason that this mounting isn't that widespread? I'm mostly concerned about floor-reflections and cancellation due to unequal distance to the listening height. But I take it that it's not too important considering the wavelenghts involved. All inputs welcome.

Comb filtering will occur if the driver stack gets higher than 1 m. You will have a hard time stacking 8 10" drivers into 1 m. Also remember that the drivers in mid air will strengthen the vertical room mode. Last: It´s always a good idea to distribute subwoofers around the room. Four SW of half size could do a much better job of controlling room modes than two big ones.

[HiFiNutNut]

Based on the latest discussions in the diyAudio forum it seems that dipole sub woofers do not have advantage over monopole sub woofers in and below the modal region. Multiple subs are preferrable. I would probably build 4 sealed subs (with active EQ) and distribute them around the room for frequencies below 100Hz.

Regards,
Bill

[Rudolf]

Based on the latest discussions in the diyAudio forum it seems that dipole sub woofers do not have advantage over monopole sub woofers in and below the modal region.

While this is true below the modal region, it does not apply in the modal region. In the modal region dipoles fuel room modes differently than monopoles. Whether this can be used to some advantage heavily depends on your local situation.

Multiple subs are preferrable. I would probably build 4 sealed subs (with active EQ) and distribute them around the room for frequencies below 100Hz.

Multiple subs always are better than single ones. Even better might be to make one of them a dipole 

[iON]

Hi Bill, Are you referring to the "Cardiod bass" thread where Earl Geddes and John Kreskowsky had some controversies regarding subs? It contains some interresting read, even though I don't think there was any general consensus on what actually sounds best. Cheers! J