Maz4bz Posted March 13, 2020 Share Posted March 13, 2020 (edited) Dear all, I built a nice ported home theatre sub for my brother, must be 18 years ago perhaps, using the Jaycar Response Precision 15" subwoofer model number CS2350. This is a really great old driver but the specs have gone missing online so in the hopes that this might help I wanted to share the DATS V2 measured T&S I took from this driver today. Vas measured with 190gms of added mass. I'd guess at a solid 10mm xmax (one way) Workbench Notes: f(s) = 24.23 Hz Q(ts) = 0.3914 V(as) = 250.6 liters (8.849 cubic feet) SPL = 90.83 dB SPL 1W/1m R(e) = 3.505 Ohms Q(es) = 0.455 Piston Diam. = 330 mm (12.99 in.) SPL = 94.42 dB SPL 2.83 Vrms C(ms) = 0.244 mm/N L(e) = 1.552 mH at 1kHz Q(ms) = 2.799 BL = 14.41 n(0) = 0.7466 % M(ms) = 177 grams Edited March 13, 2020 by Maz4bz 5 1 Link to comment Share on other sites More sharing options...
James May Posted March 14, 2020 Share Posted March 14, 2020 I used to run a pair of these in the back of my car. Massive SPL potential and surprisingly musical. 1 Link to comment Share on other sites More sharing options...
Micky Jim Posted February 21, 2021 Share Posted February 21, 2021 Hi Maz, That's great! Thanks very much for posting. I have one of these drivers and I'd like to build a box for it. Do you still have the specs of the one you made? They would be very much appreciated. Regards, Mike 1 Link to comment Share on other sites More sharing options...
Maz4bz Posted February 21, 2021 Author Share Posted February 21, 2021 Hi Mike, I don't have the old box design anymore sorry. You can plug the Thiel & Small parameters I've posted above into a free box simulator and model up what ever you'd like. Hornresp is the best in my opinion. If you have a look over at diysubwoofers.org you'll see how to's for any kind of sub you'd like to build using this software. This sub has a qts under 0.5 so is well suited to a ported design. Good luck. 1 Link to comment Share on other sites More sharing options...
MisterTwo Posted May 2, 2021 Share Posted May 2, 2021 Do you remember when they sold those bandpass cabinets to suit the 12" version of this... like 20 years ago :) Link to comment Share on other sites More sharing options...
DavidH71 Posted May 3, 2021 Share Posted May 3, 2021 (edited) Yes , I had one of those bandpass sub boxes from Jaycar , first sub I owned , had it placed behind the couch and it use to send some good vibes through the body. I ended up making it a ported cabinet and squeezed a 15" JBL Pro Audio driver in there , I still have the cabinet. Unfortunately the original 12" driver didn't survive after a subwoofer amp fault sent the full 80v dc rail to the speaker , that was one burnt voice coil. Edited May 3, 2021 by DavidH71 Link to comment Share on other sites More sharing options...
MisterTwo Posted May 3, 2021 Share Posted May 3, 2021 it'd not survive much of that, ended up leaving mine with a previous partner, still working strong :) I think the Devastators would leave it for dead these days, pretty good for something like $500 worth of woofer and material's at the time though. Link to comment Share on other sites More sharing options...
almikel Posted May 22, 2021 Share Posted May 22, 2021 @Maz4bz - great post! On 21/02/2021 at 11:19 AM, Micky Jim said: Hi Maz, That's great! Thanks very much for posting. I have one of these drivers and I'd like to build a box for it. Do you still have the specs of the one you made? They would be very much appreciated. Regards, Mike On 21/02/2021 at 10:31 PM, Maz4bz said: You can plug the Thiel & Small parameters I've posted above into a free box simulator and model up what ever you'd like. ^this A sealed box of 100 litres gives this: Put the driver into a sealed box around 100 litres and go from there... You'd need a bunch of EQ to push it down to 20Hz...if you wanted to go that low... a smidge under 15dB gain required - depending on the "in room" SPL you wanted you could easily hit amp clipping or driver Xmax. The same sealed box would require much less EQ to get to 30Hz - around 7.5dB of EQ boost A bigger box will require less EQ down low, but it will have more "droop" in the passband Same driver in a 200 litre box EQ required to push it down to 20Hz The EQ required to push it down to 20Hz in the 200litre box is much less, around 11dB, less than half the power (4dB less than 15dB) compared to the 100litre box. This is Hoffman's "Iron Rule" at play for subs - you can only have two of the below: small box efficiency low bass Choose your compromise. Mike Link to comment Share on other sites More sharing options...
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