funkyhambone Posted December 8, 2015 Share Posted December 8, 2015 Looking for two to mount to 402's. Adapter required? Quote Link to comment Share on other sites More sharing options...
Coytee Posted December 8, 2015 Share Posted December 8, 2015 If you are going to a 2" horn then yes. I think the TAD is 1 1/2" exit Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 8, 2015 Share Posted December 8, 2015 You want the TD-4002 with the snout. It has a 2" (50.8 mm) dia. exit. There is also a TD-4002Z without the snout that has a 1.53" (39 mm) dia. exit: that's the version that you should avoid. I've read that people have had trouble finding the bolt-on snout for these to convert them to 2". Chris Quote Link to comment Share on other sites More sharing options...
funkyhambone Posted December 8, 2015 Author Share Posted December 8, 2015 Have either of you heard the TAD 4001's on the 402? Any preference over the 4002? It seems Roy only fiddled with the 4002 from what I've read? Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 8, 2015 Share Posted December 8, 2015 (edited) I wouldn't believe there is much difference - mostly the weight of the unit is more than twice as heavy due to the alnico magnet rather than the neodymium magnet of the 4002. The total magnetic flux density of both units is about the same. The inner diameter of the exit is 1/16th inch less than the 4002. so you'd use a little more modeling clay on the interface of the driver's exit diameter to the K-402 horn throat. I'd start with the same crossover settings for the 4002, and change them only if there were measured differences. I wouldn't expect that there would be many of those. EDIT: I've attached a pdf table of the TAD compression drivers tad_compressiom.pdf Chris Edited December 8, 2015 by Chris A Quote Link to comment Share on other sites More sharing options...
mark1101 Posted December 8, 2015 Share Posted December 8, 2015 If you are really serious about this, I will sell you mine for $2600 + shipping. They are currently in use on K-402s and in perfect condition, and include all you need for use on your K402s. I have all the original packaging and documentation. These are virtually unobtainable and I doubt you will find any new. They are over $3K new if you can find them. Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 8, 2015 Share Posted December 8, 2015 (edited) You might be wondering what the difference is between a K-69-A driver and a TAD TD-4002 (Be diaphragm) driver. Here are the constructed impulse plots for both drivers taken in my room. I don't have to say much about which one is better and by how much: You can see the chattering frequency of the K-69-A by counting the number of peaks per millisecond. The TAD doesn't have those. Chris Edited December 8, 2015 by Chris A 1 Quote Link to comment Share on other sites More sharing options...
funkyhambone Posted December 8, 2015 Author Share Posted December 8, 2015 Thanks Chris and all for all the information. I'm taking the plunge. Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted December 8, 2015 Share Posted December 8, 2015 You might be wondering what the difference is between a K-69-A driver and a TAD TD-4002 (Be diaphragm) driver. Here are the constructed impulse plots for both drivers taken in my room. I don't have to say much about which one is better and by how much: K-69-A on K-510 chatter impulse plot.png TAD TD-4002 impulse response.png You can see the chattering frequency of the K-69-A by counting the number of peaks per millisecond. The TAD doesn't have those. Chris Chris, that is quite a difference. Are these honest to goodness IRs or are they derived from the frequency response functions? Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 8, 2015 Share Posted December 8, 2015 (edited) They're deconvolved from relatively long upsweeps (10 Hz to 20 kHz). That's why I said "constructed impulses". Since the resolution of deconvolved upsweeps is somewhat legendary within the geophysical community (Vibroseis) going back to the early 70s, I actually prefer to see the deconvolved data rather than impulses because it tells you even more than the impulses without injecting even more nonlinearities of the driver at exceedingly high SPLs. Note that the sweeps were done at about 108 dB( C ) at one metre in front of the speakers. Chris Edited December 8, 2015 by Chris A Quote Link to comment Share on other sites More sharing options...
juniper Posted December 9, 2015 Share Posted December 9, 2015 there is what appears to be a bunch of these for sale on ebay for 745 a piece.... Don't know if they are the correct ones, snout wise. Quote Link to comment Share on other sites More sharing options...
mark1101 Posted December 9, 2015 Share Posted December 9, 2015 Yes, they appear to be plentiful in Beryllium and some have the adapters, some don't. But there are also plenty of adapters available separately. This is actually a huge find and the prices are very reasonable. Just search on TAD 4002 Quote Link to comment Share on other sites More sharing options...
juniper Posted December 9, 2015 Share Posted December 9, 2015 Mark I am sure these aren't in as good shape as yours are, being they came from a monitoring system. Just ordered mine, 1400 shipped with adaptors... should be interesting to hear!!! Quote Link to comment Share on other sites More sharing options...
juniper Posted December 9, 2015 Share Posted December 9, 2015 The ones for sale on ebay are all 16ohms is this what most people are using? went too the tad sight and they list the 4002/4002z as 16 0hms? Quote Link to comment Share on other sites More sharing options...
whatever55 Posted December 9, 2015 Share Posted December 9, 2015 How can you tell if the diaphragm is original ? Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 9, 2015 Share Posted December 9, 2015 Probably by looking at the serial number on the diaphragm... Here is an apparent source for replacement Be diaphragms for the 4002: http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=63180&d=1410852677 Chris Quote Link to comment Share on other sites More sharing options...
mark1101 Posted December 9, 2015 Share Posted December 9, 2015 I never opened mine but have seen many pics of the diaphragms. The Berylliums are dark, the aluminum are silver. That's about all I know. It's not really important that it is original. It is important that it is Beryllium. Juniper, please let us know how your purchase turns out. I would love to see a FR plot of the two. 1 Quote Link to comment Share on other sites More sharing options...
Coytee Posted December 10, 2015 Share Posted December 10, 2015 Replacements are smooth and have no honeycomb covering. Original have the honeycomb shield. (though I don't think it's really honeycombed, probably round holes) Quote Link to comment Share on other sites More sharing options...
juniper Posted December 10, 2015 Share Posted December 10, 2015 (edited) I never opened mine but have seen many pics of the diaphragms. The Berylliums are dark, the aluminum are silver. That's about all I know. It's not really important that it is original. It is important that it is Beryllium. Juniper, please let us know how your purchase turns out. I would love to see a FR plot of the two. Mark will get the FR's when I can get my tech out with his gear and will post them, thanks for the heads up on the coloring, as my memory serves me the JBL be's I have seen with my friends system almost had a metallic blue colloring. Not like the Tad fram photos I looked up. THANKS AGAIN!!! Edited December 10, 2015 by juniper Quote Link to comment Share on other sites More sharing options...
juniper Posted December 10, 2015 Share Posted December 10, 2015 Replacements are smooth and have no honeycomb covering. Original have the honeycomb shield. (though I don't think it's really honeycombed, probably round holes) Thanks Coytee, they look just like that,with the shield. Now I have to decide or find the "acceptable" DCR range, the gentleman matched 2 sets for me to choose from 1 pair measuring 7.5 the other measuring 7.8????? Quote Link to comment Share on other sites More sharing options...
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