SA-8 v.2 SPL Dual-1 Testing

[sundownz Pro Seller]

I made a Dual-1 8-layer aluminum SPL coil unit for Sean with an extra spider... FS was 59Hz after some break-in so NOT good for a daily application. Due to the new ultra linear spider we have to get the FS starting out closer to the burp frequency as we lack the shift in CMS that causes FS rise with a less linear spider.

Best score to date of 152.4 "outlaw" style with 3kw clamped power -- the most we've ever put to an SA-8 to date. The sub was really only at about 1/2-2/3 stroke as well -- where the old SA-8s were hitting the triple joint on the top plate before this point.

We are very pleased as Sean's car mysteriously lost around 2dB a while back and we've had to come up with other things to gain that back... and now we've actually topped the old score without ever fixing whatever the mystery problem is (as we still don't know).

Just for good measure we also plan to test with two spiders (standard) and the SPL coil to see if we really needed the extra spider. We also plan to try adding more power since we have more stroke left.

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I have the 2 spider woofer built... just waiting on Sean to make it up here again.

Click to read more...

 

[sundownz Pro Seller]

153.3 video

We have a 4500D on it now -- still not quite at mechanical limits !

 

[sundownz Pro Seller]

I am extremely pleased...

We went from 152.5 to 153.3 changing from a 3500D to a 4500D -- this is essentially the most possible gain we could have had changing amps.

The 4500D is about 33% more powerful which in a perfect world would be just 1 dB gain... the fact that we gained 0.8 dB in reality on ONE EIGHT INCH woofer at this much power tells me just how much more we could still have in this woofer as it's just barely hitting any output compression vs. theory even still.

 

[CRXBMPN 5,000+ posts]

that is a dank # , well done

 

[oxsign 5,000+ posts]

Extremely impressive.

 

[UMWDawg92 10+ year member]

that's crazy that it's still not hitting mechanical limits!

 

[sundownz Pro Seller]

that's crazy that it's still not hitting mechanical limits!

Indeed... the new suspension / basket design is really doing it's thing ! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[UMWDawg92 10+ year member]

I didn't think you could top the Sa8 v.1s but it looks like you've succeeded

 

[The_Grimy_One 10+ year member]

That thing is a monster!

 

[J31Rob 5,000+ posts]

Gat dayum.

 

---------- Post added at 11:46 AM ---------- Previous post was at 11:46 AM ----------

 

Also, lol @ the haters on the YouTube comments.

 

[sundownz Pro Seller]

It's over 150 dB on the dash now with the 3 spider woofer (which is quieter) due to some changes in the setup. Need to build another 2 spider woofer as we damaged the first one (4000+ watt burps on an eight can do that).

More details later on //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Mitch86 5,000+ posts]

It's over 150 dB on the dash now with the 3 spider woofer (which is quieter) due to some changes in the setup. Need to build another 2 spider woofer as we damaged the first one (4000+ watt burps on an eight can do that).
More details later on //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Never would have guessed it! //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif Very nice looking woofer and seems to be getting crazy loud! Good work as usual!

 

[FlexnInLa 10+ year member]

Good lord man that is a loud 8!

 

[sundownz Pro Seller]

Thanks -- it's been a fun project for sure.

I have some more ideas for SPL now that I have this great new platform (motor / basket) to work with on the v.2 model.

It's still early in the game for maximizing these for SPL //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Flastrongman 10+ year member]

Looks like another winner on your hands, congrats Jake!

I'm sure I'll get to play with one in like 2 years from now lol.