sundownz

I will add that no cost was passed on to the end user for either the bolt down ring OR the magnet boots

... and SA-8 bolt down ring. Truck showed up late today * SA-8 and mystery prototype in background being tested. * Ohhh, nice looking magnet boot ! * Screws for bolt down ring * Just to make sure... the ring was also epoxied in. * SA-12 with magnet boot

They won't come back out of protect unless they are turn off and back on -- so they aren't popping into protect. Seems as if you are losing signal -- try another output on your HU.

3-4 months is my estimate -- if someone wanted to get custom coils made technically the SA-8 basket, cone, and spider could be used... a bit stiff for the E8 motor but would indeed work.

Yah, that is correct... all the ratings are very conservative to the point where they are still met at 12.8 volts.

We will have them in stock - at least for a little while... I do expect them to sell out again before the next run gets here. We are trying to make them faster and faster but demand keeps outpacing us. Each subwoofer will come with one from all new production runs -- starting with these 8s and 12s. I have quite a few 10s in stock still that don't have them -- they *cannot* be added to older subs as we had to make the outside of the top plate a LITTLE smaller in diameter to make the boot lock on.

Little surprise too... new magnet boots tooled as well for those that may want to inverse mount them and have a bit nicer look :

I'd wager some of those guys are just saying they are on the Team and really are not.

Hey guy - my shipping company gave me unusually good news for once My SA-8s / 12s weren't due in Charlotte until the 25th but it seems they should be at my door tomorrow after 1:00 at some point. Unless something weird happens, of course !

The power ratings will be met with 12.8v supply.

Less mechanical power handling -- but it will sound just fine.

Okay guys -- Team is full for 2010. Please do not email me about Team inquiries until 2011 -- this means not until January! Our Team is strong this year and I cannot handle the 100+ Team inquiries a week any more this year. Any Team or "sponsorship" inquiry e-mails will be deleted. Sorry for the inconvenience but my Inbox gets 100+ e-mails reading "sponsorship" every week.

Expected output is ~440 x 4 @ 1 ohm

None of our AB amps run on 18v. I'd suggest 200-250 amps fusing... maybe 300 @ 1 ohm each channel.

Yes.

No.

Some initial testing done -- very very similar to the v.1 SAZ-1500D model. I think we can squeeze a bit more out of it before production so I'll get some revisions done and then post some real numbers up

This is the prototype - ETA not set for production units.

Yep... you read that correctly. Big bad boy 200x4 Class A/B amps with full SAX-100.4D style crossovers. Stable to 1 ohm mono / 2 ohms bridged... can power a whole system. These things are MASSIVE... I know the trend is for small amps but I like big amps, and so do alot of people still These are not made for typical daily installs... they are made for BIG builds! * It is actually larger than an SAZ-3500D. * Another shot vs. SAZ-3500D ----- Before anyone asks... there is no ETA, I don't know when I'm going to open a pre-order, and pricing is not 100% set. I do expect pricing to be about like the SAZ-2000D, though... give or take.

Testing coming later... change a tad from the initial layout. We ended up with 8x IRFP360LC output FETs -- 66% of what the SAZ-3000D / 2500D have. This output section is WAY stronger than the 1500D v.1 what features IRF640 / 9640 units. Power supply features the same number of FETs as the original 1500D but a new more powerful part like the SAZ-2500D has. Power supply transformers and output inductors not changed from the v.1 1500D -- overall size down about 1.6" * Old 1500D on top and new 1500D v.2 on bottom * Internal fuses removed for SPL competition purposes - customers will need an external ANL unit * New driver board * Old driver board

All designs have their advantages and draw-backs which include but are not limited to the depth of the driver. Over-hung and split-coil designs tend to be the deepest designs -- so aren't as well suited for super shallow drivers. Under-hung can be quite shallow as you don't need alot of clearance behind the gap for the coil as BL drops off so fast afterward and the coils are short. XBL^2 tends to have the highest excursion to depth ratio possible -- I am not aware of a way to create more x-max with less depth.

I don't have the tools to show the graphs but you can also do "split coil" which results in a graph alot like XBL^2 but with alot bigger coil and more thermal power handling. You actually have two separate coil windings on the former. This has been utilized in several car audio drivers as well.

Most car audio woofers utilize over-hung for the simple fact that the coils are longer and typically handle much more abuse for that reason. A good overhung driver can also sound quite good despite have a higher THD than a flatter BL design. Many even prefer the sound generated by a driver with a parabolic BL curve as the parameter shift over excursion makes the sound "punchier" as excursion increases and the BL drops off, Qts rises, and your box gets a bigger peak in response which is often interpreted as "punch" Objectively, though, a well designed under-hung or XBL woofer (or any woofer with BL flattening tricks) will have lower distortion and is more accurate to the source... a drop off of 30% of the BL typically equates to 10% THD so we at Sundown and many other companies list x-max as the 70% BL point.

Originally posted over on SMD to answer a question - but I figured some folks over here may enjoy it as well : I need Bl/Bl Curve Explained - SMD Forum You will typically need a Klippel or DUMAX to measure the BL curve. You can assumme, though, that most overhung (long coils) at quite parabolic in nature... most under-hung have a flat spot in the center and then become parabolic. There are ways around this... Alpine flattens it out nicely in the new Type-R with some clever pole machine work: They machined in a bell shape inside the pole that flattens out the BL curve in the center -- here is an image from their patent: ---------- Some other examples below. First we have an overhung - the below is an approximation of the NS v.2 motor... very long gap / long coil design but still parabolic as it's overhung. As far as overhung goes the BL distortion is quite low as with the 71mm coil and 40mm top plate we achieve ~27mm linear one-way throw. * You see some of the coil sits outside the flux field and the flux is centered in the gap at highest level. ----- Next we have underhung - where you can immerse the coil in the peak flux field and it won't leave that area for some amount of stroke therefore giving you a small flat area before becoming parabolic. * One issue is the tall top plate and short coil tends to make the motors weak as there is poor flux utilization unless you use a giant magnet. ----- Now we have something really fancy called XBL^2 -- you have two gaps and the flux is steered around to immerse more coil than underhung and it also forces the flux out farther to extend the flat area of the BL curve. * Not the greatest example for SQ purposes as it's a big Neo SPL woofer... but you can see how the flux is broken up into two peak concentrations (dark blue areas) with some of the coil in each of those areas. The middle is no longer the strongest spot. As the bottom of the coil leaves the lower flux concentration it equally enters the top concentration so BL does not change for quite some time. These gaps can be stacked if necessary to achieve TONS of flat BL. ----- For the technical folks out there... I'm not attempting to fully explain any and all topologies -- just giving people a general idea of how they work. So lets keep the nit picking to yourselves. Feel free to add information if you like, though !

Out of the gate on music at 154.6 dB Congrats Richard Willoughby on your accomplishment ! I emailed him to get some photos as well This is a dash score.