net Posted August 18, 2019 Share Posted August 18, 2019 (edited) Hi I need some assistance with a pair of sub-woofers that I picked up a while back. Does anybody have any knowledge about the specification of the specially created limited pairs-SW200 that was made by Lorantz Audio? Thanksnks Edited August 18, 2019 by net grammar Link to comment Share on other sites More sharing options...
HdB Posted August 18, 2019 Share Posted August 18, 2019 Pretty sure that if you direct your enquiry to Michael at Lorantz, he can fill you in on all the details. Link to comment Share on other sites More sharing options...
net Posted August 18, 2019 Author Share Posted August 18, 2019 I did but he has lost his 386 files Thanks Link to comment Share on other sites More sharing options...
HdB Posted August 18, 2019 Share Posted August 18, 2019 So, next suggestion would be to add a query in the MAC newsletter, and/or drop a line to Doug Tipping or perhaps Ian McFarlan (?). Link to comment Share on other sites More sharing options...
net Posted August 19, 2019 Author Share Posted August 19, 2019 Ok Thanks Link to comment Share on other sites More sharing options...
Auracle Posted August 19, 2019 Share Posted August 19, 2019 Sadly, the only other person that would have had that information passed away last year. Link to comment Share on other sites More sharing options...
afa Posted August 19, 2019 Share Posted August 19, 2019 (edited) I had one sitting in my workshop for quite a few years till i sold it, it was still in its original cardboard box along with its spec sheet (typed and hand drawn) which included a schematic of a bass boost circuit that was required to lift the low frequency a few dB, it used to belong to an MAC member who gave it to me to use, but it didnt stack up to what is available nowadays when it comes to sub drivers. I guess you could measure the driver to get all the necessary specs to sim a suitable design. cheers, Arthur. Edited August 19, 2019 by afa spelling Link to comment Share on other sites More sharing options...
net Posted August 20, 2019 Author Share Posted August 20, 2019 Afa It would be a great help if you could share pictures of any information in your possession. I have a pair and would like to incorporate them into A 3 way speaker, using a dynaudio d 52 at and a peerless tweeter. Regards Link to comment Share on other sites More sharing options...
davewantsmoore Posted August 21, 2019 Share Posted August 21, 2019 5 hours ago, net said: I have a pair and would like to incorporate them into A 3 way speaker The best advice by far is get a impedance tester,and measure the parameters... or get someone to do it. Old woofer parameters may/will have drifted. Without doing this, you're going to have a bad time. 1 Link to comment Share on other sites More sharing options...
net Posted August 21, 2019 Author Share Posted August 21, 2019 Ok Thanks Link to comment Share on other sites More sharing options...
afa Posted August 23, 2019 Share Posted August 23, 2019 Hi again, Best thing to do is what dave says, also seeing as you want to use them as a woofer in a 3 way you will also probably need to get a frequency response measurement done of the woofer (ideally on the baffle you intend to use) to see if it would have a suitable smooth frequency response up to (and beyond) the required frequency you intend to crossover to the D52. From memory I think the Qt of the woofer was around .2, Fs was mid 20's, I cant remember what the Vas was, and the box alignment recommended was an EBS (extended bass shelf) which was why it needed the bass boost eq cct. BTW do you have all the gear and skills to design and build a 3 way speaker? if not...good luck.. cheers, Arthur. Link to comment Share on other sites More sharing options...
net Posted August 28, 2019 Author Share Posted August 28, 2019 Thanks again. I will test them and also try on the baffle that I have on hand. Just too many things to get going. Regards Link to comment Share on other sites More sharing options...
HdB Posted August 28, 2019 Share Posted August 28, 2019 Over the last few years, the accelerated development in speaker technology has been phenomenal, and our own Lorantz guys are definitely in the forefront in this - in fact, they're one of the best speaker driver manufacturers in the world (no exaggeration here either) but they don't manufacture to any 'high fi' market, unfortunately. However, there's nothing wrong with using a 'pro-audio' driver, particularly a bass or bass/mid driver of recent manufacture in your hifi speakers - in general, they'll be higher efficiency, far lower distortion, better linearity, extended freq response, etc, etc than any of the 'marketed' hifi speaker drivers from any of the well known brands, although this is slowly changing. The big difficulty is actually getting your hands on one! Link to comment Share on other sites More sharing options...
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