I have alluded to a pair of subs for a FAST system with any of the Alpair drivers. Well, here they are!!
Since the subs are intended to be stands for the satellite speakers, the physical dimensions are dictated by function. The subs are 24" high and 12" wide to provide a relatively small visual appearance, which forces the depth to be 17". This models out to be a Qtc of 0.7 with moderate stuffing. Oh, yes. The drivers are the Dayton RS315HF-4's. This gives F3=39Hz and F10=24Hz. At 250w/ch they will do 100dB@23Hz. At a modest 75w/ch, they will do 90dB@18hz.
I have yet to do any measurements or play with the XO point/slope or EQ yet (miniDSP). I just pulled the Goldwood 18" H-frames and stuck the Dayton in. The XO is LR4@250Hz and there is a brickwall at 25Hz, so the Dayton's aren't getting to the bottom yet. The brickwall was necessary with the Goldwood's because of their Xmax is a measly 2mm. The Daytons are 14mm.
The tops are a pair of BR's I am working on for the A10P. They show real promise, but that is another story.
Regardless of the work I need to do with the XO/EQ, the XO is seamless. 'Cellos and bassoons go through the XO with no complaints. I think I have a winner here.
I can't get decent 18mm material out here in the wilderness, so I am stuck with 12mm Russian birch plywood. Not thinking that 12mm plywood would be the best thing for a sub box, I laminated up 24mm panels. That should do it! And how! These suckers weight 65lb a piece. I did put a brace above the driver side-to-side, not that it needed it.
The first picture is an oblique of the sub. Next, the sub with the A10P BR on top. Last, the pair in place. Note that I toe the BR's out ~10*. This seams to work best for me.
Bob
Since the subs are intended to be stands for the satellite speakers, the physical dimensions are dictated by function. The subs are 24" high and 12" wide to provide a relatively small visual appearance, which forces the depth to be 17". This models out to be a Qtc of 0.7 with moderate stuffing. Oh, yes. The drivers are the Dayton RS315HF-4's. This gives F3=39Hz and F10=24Hz. At 250w/ch they will do 100dB@23Hz. At a modest 75w/ch, they will do 90dB@18hz.
I have yet to do any measurements or play with the XO point/slope or EQ yet (miniDSP). I just pulled the Goldwood 18" H-frames and stuck the Dayton in. The XO is LR4@250Hz and there is a brickwall at 25Hz, so the Dayton's aren't getting to the bottom yet. The brickwall was necessary with the Goldwood's because of their Xmax is a measly 2mm. The Daytons are 14mm.
The tops are a pair of BR's I am working on for the A10P. They show real promise, but that is another story.
Regardless of the work I need to do with the XO/EQ, the XO is seamless. 'Cellos and bassoons go through the XO with no complaints. I think I have a winner here.
I can't get decent 18mm material out here in the wilderness, so I am stuck with 12mm Russian birch plywood. Not thinking that 12mm plywood would be the best thing for a sub box, I laminated up 24mm panels. That should do it! And how! These suckers weight 65lb a piece. I did put a brace above the driver side-to-side, not that it needed it.
The first picture is an oblique of the sub. Next, the sub with the A10P BR on top. Last, the pair in place. Note that I toe the BR's out ~10*. This seams to work best for me.
Bob