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View Full Version : SA-8 v.2 SPL Dual-1 Testing



sundownz
01-27-2012, 06:02 PM
Single Sundown SA8v2 prototype 152.4 dB - YouTube (http://www.youtube.com/watch?v=t-o8wHkOn0o)

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.

-----

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

sundownz
01-31-2012, 10:21 PM
SA-8 v.2 : 153.3 dB - YouTube (http://www.youtube.com/watch?v=J6pcza9y_2o)

153.3 video

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

sundownz
02-01-2012, 10:02 AM
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
02-01-2012, 10:10 AM
that is a dank # , well done

oxsign
02-01-2012, 10:44 AM
Extremely impressive.

UMWDawg92
02-01-2012, 11:12 AM
that's crazy that it's still not hitting mechanical limits!

sundownz
02-01-2012, 11:13 AM
that's crazy that it's still not hitting mechanical limits!

Indeed... the new suspension / basket design is really doing it's thing ! :)

UMWDawg92
02-01-2012, 11:18 AM
I didn't think you could top the Sa8 v.1s but it looks like you've succeeded

The_Grimy_One
02-01-2012, 11:32 AM
That thing is a monster!

J31Rob
02-01-2012, 11:46 AM
Gat dayum.

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

Also, lol @ the haters on the YouTube comments.

sundownz
02-26-2012, 09:56 AM
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 ;)

Mitch86
02-26-2012, 10:01 AM
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 ;)

Never would have guessed it! :laugh: Very nice looking woofer and seems to be getting crazy loud! Good work as usual!

FlexnInLa
02-26-2012, 10:01 AM
Good lord man that is a loud 8!

sundownz
02-26-2012, 10:05 AM
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 :)

Flastrongman
02-26-2012, 10:18 AM
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.

Bettr n' Revrse
02-26-2012, 11:09 AM
Now do a trunk car lol

sundownz
02-27-2012, 09:46 AM
Haha... if any of us owned one we may give it a whack :) Only my family ride is a trunk car (2011 Kia Optima SX) - but I haven't messed with the stereo at all yet.

snoopdan
02-27-2012, 09:52 AM
Now do a trunk car lol

Its not good for advertisement if he did that.

Flastrongman
02-27-2012, 10:34 AM
hey if you want to "donate" one to me, I'll attempt to break a 150 out of the trunk of my mazda protege. LOL

actually 99% sure I can do it.

Bettr n' Revrse
02-27-2012, 03:15 PM
I'll test one in my Honda if you want too lol

Imtjnotu
02-27-2012, 03:19 PM
jacob any plans to make any of the subs Single Coils?

sundownz
03-08-2012, 02:40 PM
jacob any plans to make any of the subs Single Coils?

I have no plans to do so -- any particular reason ?

resonate
03-25-2012, 09:21 PM
Extremely impressive.

Very.

But, OP, are you saying 2 SA-8s wouldn't be good for a daily application?

groundpound4200
03-25-2012, 09:51 PM
no, just the SPL purpose built driver that he was testing

dirtyunclerandy
03-25-2012, 11:05 PM
Haha... if any of us owned one we may give it a whack :) Only my family ride is a trunk car (2011 Kia Optima SX) - but I haven't messed with the stereo at all yet.
I haven't found anybody with one of those cars who has upgraded the sound. I just got one and need ideas.

sundownz
03-27-2012, 08:14 AM
I haven't found anybody with one of those cars who has upgraded the sound. I just got one and need ideas.

I probably won't mess with it for a couple years to be honest -- as 99% of the time my wife drives it.

sundownz
03-27-2012, 02:20 PM
Single SA8v2 150.8 dB on the dash - YouTube (http://www.youtube.com/watch?v=ldLR-JVK9GI)

Sean's 150.8 dB from SBN.

Trancer
03-27-2012, 02:59 PM
Wow Jacob. When will you stop amazing me? Just when I think I have seen it all from you, you top it with another SA-8. That's simply amazing bro. Good work. You are insane

Phoenix Risen
03-27-2012, 03:11 PM
Single SA8v2 150.8 dB on the dash - YouTube (http://www.youtube.com/watch?v=ldLR-JVK9GI)

Sean's 150.8 dB from SBN.

i got to watch that run in person. its crazy to see that little 8 taking a ns1 (granted its not taking all of it)

im looking forward to having my pair to play with,