looky What I Just Got

[sourceoneaudio]

http://pics.ebaystatic.com/aw/pics/globalAssets/ltCurve.gif

JBL W15GTI 15" DVC SUBWOOFER 60th Anniversary Edition.


60th anniversary edition. Used in Team JBL Demo Car, less than 3 hrs on them not even broken in yet.

Going to use these (2) in my HT subwoofer enclosures. I will post pictures of the install, and I will also be adding more cabinet reinforcing. Should have them by the weekend, and I'll be cracking the plaster.
Going to run the Adcom GFA-5802 at a three ohm load should be very interesting to see, and hear that out come. Power per channel ??????? (700 to 750?)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&sspagename=ADME%3AL%3ARTQ%3AUS%3A1&viewitem=&item=170090090814&rd=1

Going to be an exciting day when these babies are fired up. Like a kid in a kandy/JBL store. :bouncy::bouncy::bouncy::bouncy::bouncy::bouncy:

Should be a Holy Bat Crap experience Bat Man!!!!!!!!!!!

J/S-S1A :rockon2:

[kingjames]

Nice score and do show some pictures when their fired up.

I ought to be able to hear those over here when your done.:D

[sourceoneaudio]

I'm so excited I could almost pee!!!!!!!!!!!!!!!:eek: I can't wait.:bouncy:


J/S-S1A :nutz::nutz::nutz:

[kingjames]

:rotfl: :rotfl: :rotfl:

[sourceoneaudio]

Nice score and do show some pictures when their fired up.

I ought to be able to hear those over here when your done.:D

I don't know about hearing them but your probably feel that 20 cycle frequency hitting you in the seat of your chair. Things in your office might start to rattle and move across the desk top. Just tell your co-workers, it's Jeff In AZ.


J/S-S1A :D

[sourceoneaudio]

They are here, can't lift them out of the box though :( until the neighbor gets home. Still recovering from back surgery. Play time coming soon.

J/S-S1A :D

[boputnam]

They are here...Interesting - the surround is mounted on the face of the cone. :dont-know

[johnaec]

Interesting - the surround is mounted on the face of the cone. :dont-knowAs is the Sub1500 and several other current JBL's that use the rubber-type surrounds.

John

[JBL 4645]

Interesting - the surround is mounted on the face of the cone. :dont-know

Usually these a (gasket) that goes around the edge surround of the loudspeaker.

[sourceoneaudio]

Usually these a (gasket) that goes around the edge surround of the loudspeaker.


JBL 4645,
To what are you referring too, and placement? :screwy: Are you talking about a rear sealing gasket. No illustrations show what you are talking about.

J/S-S1A :blink:

[sourceoneaudio]

Well after a half day of working on these babies, they are in and running. Ended up going with the first simulation using one passive. Could not wait for second got a little to anxious. The simulation was run by a fellow forum member and I thank you again for the help.
The cabinets total area is 5.36 cubic feet before subtracting the area the driver takes up, and the passive. I ended up using 75 grams on the rear of the passive for tunning. These cabinets were done originally with a 1.5" x 1.5" vertical brace, 1" thick MDF, and a 2" cleat from front to back on all four corners. With this bracing I was still getting too much top panel flexing, so I did a cross brace tie in with the top panel, and the vertical brace to help minimize, or put a halt to this issue before installing the W15GTI-MKII's.
This extra step has seemed to help a lot with curing the flexing issue, still getting some vibration on the top side, but it is very minimal. (acceptable)
Finish on the cabinets is Oak Wood Grain Formica, looks great, and is stain resistant.
I tried doing the over stuff theory to fake out the driver, but this seemed to hinder the LF output, so I went back to the three wall insulation application. Overall I would say I'm satisfied with the results, woofers are still breaking in, but I am contemplating the second passive, or going to an 8 cubic foot box. I think the hardest part of the 8 cubic foot cabinet is getting it past the wife. I think she will notice a difference in the size of the end tables. :p

Passive part no: http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=295-194

See pics for the project fun. :D
Amp running them is a Adcom GFA-5802 @ a 3ohm load per channel. So far so good no thermal issues, and plenty of volume!!!!!!!!!! Tight, and QWIK!!!!!!!

[sourceoneaudio]

The rest of the pics.

[clmrt]

Dayum!

[JBL 4645]

Bugger, me that looks awesome!:applaud:

[sourceoneaudio]

Thank you berrrrrrry much. They sound pretty awesome also, little more fine tunning and I'll think we'll have it whipped! (Thanx to a fellow LH member)

These should be the last sub drivers I ever purchase for the HT room. :applaud::applaud::applaud: I think Nirvana is around the corner..........


J/S-S1A :D

[sourceoneaudio]

We have reached max X-MAX with the Parts Express passives. So weighted and tuned correct they do not pass mustard. We are very close to picking up pieces of cone material off of the ground. Crazy Excursion :jawdrop: during DTS formatted movies. Music is good, and bass response is tight, and punchy in the upper volume levels. So far these subs are very impressive, subtle low frequency passages during movie play back are very defined and amazing, I would recommend the use of these drivers for any application.

So as far as new passives go I'm looking at these brands.

http://www.tcsounds.com/tcvmp.htm#specs

Seems they are one of the few manufacturing high X-MAX passives, 80mm peak to peak, and 500 to 2500 gram weight capacity.

Specifications
http://www.tcsounds.com/TC_pics/icons/divide2.gif


3" wide variable mass load adaptor
500 grams up to ~2500 grams of variable mass (90 gram iterations)
xmax of 40mm (one way linear compliance)
Single ultra wide 10" poly-cotton spider
Cast aluminum basket with high gloss metallic powder coating
Tall (NBR) surround for high excursion and better longevity than foam

Includes up to 2000 grams of selectable mass washers

High quality thermal flexible epoxies to ensure longevity
Rigid lightweight brushed aluminum cone
Hand built in our San Diego, CA factory


*mounting depth includes 2.0" extra spacing for excursion


Thiele Small Parameters
http://www.tcsounds.com/TC_pics/icons/divide2.gif


12" TC-VMP
Vap0.0 Dia250mm Vas0.0l V-Fs4Hz-24Hz cms0.0m/N V-mms500g-2500g
15" TC-VMP
Vap0.0 Dia325mm Vas0.0l V-Fs4Hz-24Hz cms0.0m/N V-mms500g-2500g
18" TC-VMP
Vap0.0 Dia390mm Vas0.0l V-Fs4Hz-24Hz cms0.0m/N V-mms500g-2500g


This is the other brand I'm looking at, and I have seen threads on th LH forum in regards to their use. Stryke Audio SA-PR18-1600. But I think production has stopped for I can't find a seller of them new. The link below is no longer carrying them.

http://www.acoustic-visions.com/~acoustic/products/passive_radiators/stryke_pr18/indexold.shtml (http://www.acoustic-visions.com/%7Eacoustic/products/passive_radiators/stryke_pr18/indexold.shtml)

So needless to say the volume control has been regulated depending on the source input.

The LH member who is helping me tune these bad boys has run the Stryke Audio 18" in a simulation and it seems to do the trick. Stated below are the results. This is the passive I would like to use if I can find some????
The above PR will work just fine, but the cost is much higher, and they are out of stock on them.

I modeled the 1600g in 5 cu ft, it looks absolutely bullet proof - Group delay is very low, power handling is off the chart, cone excursion for both is safe at 105db+ from 20Hz on up....dayum....

Worthy of discussion in public. I'm only parroting what I see in ISD - I'd like to hear others' views...

SA-PR18-1600

FS 4hz
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
Mms 1600 grams
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
Qms85
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
SD 1200cm^2
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
Vd 9L
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
Vas 1840L
http://www.acoustic-visions.com/%7Eacoustic/Common/images/pages/spacer.gif
Xmax 76mm p-p

If anyone can help with this issue in finding, or wanting to sell a couple of the Stryke Audio passives let me know.

J/S-S1A :D

[clmrt]

Here's what I've run so far -

:banghead:

Can't attach a .wpr

I can email it to anyone who'd like to see it.

5 foot box, 200 watt input, three scenarios -

1x PE 15" PR
2x PE 15" PR
1x 18" PR

[sourceoneaudio]

We have reached max X-MAX with the Parts Express passives.


J/S-S1A :D


Well I have spent more time messing around with these subs because I have felt something was missing. Yes Clmrt and I have discussed putting them in a bigger enclosure, but I still felt that I could get more form the cabinets in hand.
So I messed around with adding more weight, pulling insulation, ended up putting back the insulation to a thinner layer on the bottom and putting the weight back to first calculation. While I was doing all of this I noticed the spider had come unglued from the basket. This is bad because it threw the alignment off under extreme conditions, and I was getting a serious blapping. The extreme x-max issues as I stated above partially was due to this new discovery. This was not the fault of adding the JBL's in, I have had this problem for a while, never expected or even looked for it since they are not that old. So I re-glued back to the basket, and it's all better now. I also reduced the sub out to -2db and now that they are broken in, which does take a while, the low frequency reproduction gets more and more impressive every time I listen to them. Let me tell you what, this is the first sub design that I have ever done that during a movie formatted in either DTS, or Dolby Digital when a low passage comes out from no where, and I did not expect it, I about jump off the couch. Definitely a HOLY SHIT experience! So needles to say these W15GTI's kick some serious ASH!
So bigger box? Still up in the air. $$$

J/S-S1A :D

[DS-21]

Even with the PR fixed, going to dual opposing PR's is a very good idea. Though the linear throw of the W1-GTi series does not quite measure as one would expect it to (notes about a W15GTi measured further down in the thread) with a 15", 22mm xmax PR you're still on the edge even if the realistic xmax is only ~12mm on the woofer itself. A second one will also have the advantage of cancellng out box vibrations.

[sourceoneaudio]

Thank you for the information. I copied the link so that it functions.

http://www.diymobileaudio.com/forum/showthread.php?t=11864

http://www.jblpro.com/pub/technote/JBL_TN%201-33%20rev3.pdf

Jeff
J/S-S1A :D

[Thom]

I've played with this woofer a tiny and I mean tiny bit. They must have used steel where the pro woofers use aluminum because they're supposed to be light and this bugger is heavy as hell. I've really only tried it in a sealed box that was designed for a pickup and it wasn't what I expected at all. Going to try ported but I expected, stick a DC300 on it with an active crossover and be impressed and it's going to need more than that.

[northwood]

cool