Figured I would post this over here too for those interested in some good old fashioned woofer testing!
Sundown Audio SA-12 Prototype
600-watts RMS / 2.5" Coil / D4 configuration
ETA - Don't have one yet
Yes, it will have "Sundown Audio" on the dust cap by the time it reaches production.
Designed to be used as a pair with the SAE-1200D.
Will first be available in 12s when production is ready, then other sizes later (no 8s or 18s).
INITIAL TESTING TODAY:
I used the old test box from the VW in the Jeep... which is ~2 cubes tuned around 30-35 Hz or so, port nearly touching the hatch (eg: very poor setup for getting numbers).
* Pictures from testing in my VW
Peak still @ 50 Hz -- 138.3 dB with ~720 watts or so.
I played music with constant power from 500 - 720 watts clamped in this box for 5-10 minutes. Woofer did not display any mechanical stress except on 720-watt peaks -- will probably make the magnet stack taller for production to avoid that as the coil can contact the back plate at 26.25mm of excursion, which I was able to achieve.
I also played the 50 Hz tone for several minutes at the same power level as before - score stayed pretty constant.
I then turned the frequency up to 60 Hz and let it play... didn't really clamp the power at first but about 20 seconds in I got curious. Sub was seeing 1800+ watts clamped power and by the time I hit pause was doing so for about 40 seconds or so. Sub is still just fine.
So... probably 15 minutes or so of at least 500 watts and as much as 1800 watts on sine wave material and no issues at all.
Design seems to be meeting it's goals so far.
I want to make a top plate for my SPL box to see what it does in there as well just for kicks
PS: I made a mistake on my spec sheet for the factory... forgot to tell them to make the coils D4 so I got S8 coils... I have two 3000s strapped on it to get this power level
Oh yah... and most importantly the driver sounds pretty darn good to. This test box is tuned low so I was able to get a feel for the sound a typical customer will experience and I am pleased with it.
178 volts / 9.5 amps clamped peak... 9.4 ohms per amp calculated... 1691 watts.
Can't get any more juice than that at 50 Hz in my SPL box. The woofer was NOT showing any signs of mechanical strain @ the 50 Hz burp frequency in this box -- the sub has more in it and, for that matter, should probably be in a smaller box as this is my 15" woofer SPL box So I am very pleased with it.
145.2 dB score in the SPL box.
I kept playing it for a while at the same level... probably a few minutes. Still no issues with the sub.
The top plate of the box has a gap under it as I used some neoprene foam as a gasket since it is just temporary.
This is not really an SPL driver but I am abuse testing it as I always do with any new product Still pretty loud too, though!
The only changes that may be in order:
1) 10mm taller magnet stack to make bottoming the coil impossible.
2) Moving the back plate vent holes inward towards the pole.
Other than that I am very satisfied with the results.